SITRANS SL Catalog Sheet

© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Overview
SITRANS SL is a diode laser gas analyzer with a measuring principle based on the specific light absorption of different gas components. SITRANS SL is suitable for fast, non-contact measurement of gas concentrations in process or flue gases. An analyzer
consisting of transmitter and receiver units (sensors) is used for
each measuring point. The hardware for further processing of
the measured signal into a concentration value, as well as the
monitoring, control and communication functions, are integrated
in these two main modules. The sensors are designed for operation under harsh environmental conditions.
■ Application
Applications
• Control of combustion processes
• Process optimization
• Plant and operator safety
• Process measurements in all types of power and combustion
plants
• Process control
• Explosion protection
• Measurements in corrosive and toxic gases
• Quality control
Sectors
• Chemical and petrochemical plants
• Power plants
• Waste incinerators
• Iron and steel industry
SITRANS SL
■ Benefits
The in-situ SITRANS SL gas analyzer features high operational
availability, unique analytical selectivity, and a wide range of
possible applications. SITRANS SL permits measurement of a
gas component directly in the process:
• With high dust load
• In hot, humid, corrosive, explosive, or toxic gases
• In applications showing strong varying gas compositions
• Under harsh environmental conditions at the measuring point
• Highly selective, i.e. mostly without cross-sensitivities
Special features of the SITRANS SL:
• Little installation effort
• Minimum maintenance requirements
• Extremely rugged design
• High long-term stability through built-in, maintenance-free
reference gas cell
• Real-time measurements
Moreover, the analyzer provides warning and error messages:
• When maintenance is required
- With large variations in the reference signal
- With poor signal quality
• If the transmission violates an upper or lower limit
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© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Design
2
The SITRANS SL gas analyzer consists of a pair of cross-duct
sensors, a transmitter unit and a detector unit, both with the
same dimensions. The complete analyzer is integrated in these
two enclosures. The transmitter unit contains the laser source
whose light is transmitted to the receiver through the measurement path. The detector unit contains a photodetector including
electronics as well as a reference cell. The detector unit is connected to the transmitter unit by means of a sensor cable. A further cable on the receiver is used to connect the power supply
and the communication interfaces. The receiver enclosure contains a local user interface (LUI) with an LC display which can be
read through a window in the cover. The LUI is operated by remote-control.
Transmitter and detector units
Special features of the transmitter and detector units:
• In-situ cross-duct sensors, designed as transmitter and detector units, connected via sensor cable
• Powder-coated aluminium; stainless steel
• Degree of protection IP65
• Adjustable process connection plates
• Flange sizes (provided by customer): DN 50/PN 25,
ANSI 4’’/150 lbs
• Purging gas connections (see "Purging")
• Optional: Explosion-protected version in accordance with
- Ex II 2G Ex de op is IIC T6
Ex II 2D Ex tD A21 IP65 T85°C
Local user interface (LUI) of SITRANS SL in the detector unit
(display of measured value)
Remote control keypad for SITRANS SL
Connection cables
SITRANS SL is supplied as standard without connecting cables.
These must be provided by the customer or are available as accessories. Exception: The standard ATEX version is supplied
with pre-installed cabling.
SITRANS SL, detector unit
Parts in contact with the process gas
Only the stainless steel flange of the sensor with borosilicate window and FFKM gasket is wetted by the process gas. This has
optional connections for purging the process gas side with an
appropriate gaseous medium.
Display and control panel
Special features of the detector unit:
• Display for simultaneous output of result and device status
• LED backlighting of display
• Remote control with infrared interface for simplified configuration and operation for safe implementation in hazardous areas
• Menu-driven operation for parameterization and diagnostics
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The sensor cable connects together the transmitter and detector
units of the analyzer.
The sensor connecting cable available as a cable set for the
ATEX version as standard, and for non-Ex applications optionally, is offered in lengths of 5, 10 or 25 m. This (optional) cable
set also enables permanent installation of an Ethernet cable
used for service and maintenance purposes.
A rugged cable sleeve should be used as UV protection for installations in open cable ducts or channel systems.
The statutory directives must be observed in the event of installation in hazardous areas.
For the ATEX version of SITRANS SL, the sensor connecting cable must be connected between the two Ex-e terminal boxes secured on the transmitter and receiver units.
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Inputs/outputs
• 2 analog inputs (4 to 20 mA) for process gas temperature and
pressure
• 2 analog outputs (4 to 20 mA) for gas concentration or for concentration and transmission
• 1 configurable binary input
• 2 configurable binary outputs (display of faults, maintenance
requirement, function monitoring, alarms for limit violations of
measured value or transmission)
• 1 Ethernet 10Base-TX port, only for servicing and maintenance
The PROFIBUS DP protocol provides DPV0, cyclic data. Measured values are provided with additional quality data.
Optional
• 1 Modbus interface with
- Output of concentration as cyclic data
- Alarm output, alarm classification
- Input for temperature and/or pressure data for compensation
• 1 PROFIBUS DP interface with:
- Output of concentration as cyclic data
- Alarm output, alarm classification
- Input for temperature and/or pressure data for compensation
Note:
In contrast to the other interfaces, the Ethernet plug-in connector
on standard non-Ex devices is only accessible following removal
of the detector unit cover. With the help of the sensor connection
cable set (optional with non-Ex devices), an Ethernet cable can
be permanently installed via the terminal box of the sensor connecting cable. The Ethernet connection via the sensor connecting cable can also only be used for temporary service and maintenance purposes.
NOTICE:
In an Ex environment, Ethernet connections may only be made
or removed with the permission of the plant operator!
■ Function
Operating principle
SITRANS SL is a gas analyzer employing single-line molecular
absorption spectroscopy. A diode laser emits a beam of infrared
light which passes through the process gas and is received by
a detector unit. The wavelength of the laser diode output is tuned
to a gas-specific absorption line. The laser continuously scans
this single absorption line with a very high spectral resolution.
The degree of absorption and the line shape are used for the
evaluation.
Transmitter
Receiver
Optics tube (transmitter)
Optics tube (receiver)
Laser
Optics
Laser electronics
Optics
Measured
volume
Electric interface
Reference
cell
Detector
Optics
Reference cell
Electric filter
Optics
Electric interface
Sensor head (transmitter)
Sensor head (receiver)
Computer for control and evaluation
Laser control
Electric
interface
Customer
interface
Local
display
Measurement External sensors
Alarms
for compensation
Basic design of the SITRANS SL
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© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
The field design of the SITRANS SL in-situ gas analyzer consists
of a transmitter unit and a detector unit. The light which is not absorbed by the sample is detected in the receiver. The concentration of the gas component is determined from the absorption.
The SITRANS SL analyzer measures a single gas component by
means of the absorption capacity of a single fully resolved molecular absorption line.
2
Reference signal
Absorption
Measured signal
Wavelength [nm]
Configuration
A feature of the in-situ analytical procedure is that the physical
measurement takes place directly in the stream of process gas
and directly in the actual process gas line. All process parameters such as gas matrix, pressure, temperature, moisture, dust
load, flow velocity and mounting orientation can influence the
measuring properties of the SITRANS SL and must therefore be
investigated for each new application.
The standard applications listed in the ordering data for the
SITRANS SL are distinguished in that the typical process conditions are adequately well-known and documented. If you cannot
find your application among the standard applications, please
contact Siemens. We will be pleased to check your possible individual application of the SITRANS SL. You can find an application questionnaire on the SITRANS SL product site on the Internet: www.siemens.com/insituquestionnaire
Process flange
- Dimensions
- Temperature
Gas concentration
Flue gas
composition
Dust load
Gas velocity
Gas temperature
Gas pressure
Purging tube length
Receiver
Transmitter
Absorption spectrum of measured signal and reference signal with
SITRANS SL
SITRANS SL is designed for measuring oxygen (O2) and carbon
monoxide (CO) at high sensitivity.
Measuring
path length
Typical application specifications:
Process pressure/temperature conditions (with O2 application)
700 ... 5 000 hPa
(absolute)/0 ... 200 °C
900 ... 1 100 hPa
(absolute)/0 ... 600 °C
Carbon monoxide concentration
Smallest measuring range:
0 … 100 ppm @ 1 m
Largest measuring range:
0 … 6 000 ppm @ 30 cm
Process gas pressure/temperature
conditions with CO application
700 … 2 000 hPa (absolute) /
-20 … 300 °C
800 … 1 200 hPa (absolute) /
300 … 700 °C
The measuring performance of the SITRANS SL depends,
among others, on the actual, individual process conditions with
regard to concentration ranges, pressure and temperature.
An internal reference cell is used to constantly check the stability
of the spectrometer.
The self-calibration of the analyzer is therefore valid for one year
without the necessity for external recalibration using calibration
gases.
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Sensor cable
Purging on the sensor side
0 ... 100 vol %
Purging on the process side
Oxygen concentration
Typical cross-duct arrangement of the SITRANS SL
The SITRANS SL can be optionally purged on the process side
using appropriate purging gases to prevent contamination of the
sensor optics on the process side. Purging tubes on the sensor
heads, which slightly extend into the process gas stream, define
the effective measuring path length.
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Influences on the measurement
Pressure
Dust load
In addition to the temperature signal, an external pressure signal
can be fed to the instrument to provide complete mathematical
compensation for the pressure influence including the density
effect. Without compensation, the relative error caused by
changes in the process gas pressure is approx. 0.1 %/hPa. An
external pressure signal is therefore recommended in most
cases.
As long as the laser beam is able to generate a suitable detector
signal, the dust load in the process gas does not influence the
analytical result. By applying a dynamic background correction,
measurements can be carried out without any negative impact.
Under optimal conditions, the SITRANS SL can cope with dust
loads up to 20 g/Nm³ and up to a measured path length of 8 m.
The influence of a high dust load is extremely complex, and depends on the optical path length and particle size. The optical
damping increases exponentially at longer path lengths. Smaller
particles also have a very large influence on the optical damping. With high dust load, long path length and small particle size,
the technical support at Siemens should be consulted.
Temperature
The influence of temperature on the absorption line is compensated by a correction file. A temperature signal can be fed into
the instrument from an external temperature sensor. The signal
is then used for mathematical correction of the influence of the
temperature on the concentration strength. If the process gas
temperature remains constant, a static correction can be carried
out as an alternative. Without temperature compensation, the relative error caused by changes in the gas temperature has an extensive effect on the measurement (e.g. up to 0.24 %/K with the
O2 application). An external temperature signal is therefore recommended in most cases.
Transmitter unit
Flange connection plate
(process interface)
Effective optical path length
As a result of Beer-Lambert’s law, the absorption of laser light depends on the optical path length within the sample gas. Therefore the precision of the effective optical path length measurement can have an effect on the precision of the total
measurement.
Since the sensor optics on the process side usually has to be
purged to keep it clean for a longer period, the extent of the
mixed zone between the purging medium and the process gas
as well as the latter’s concentration distribution must be considered. In a typical in-situ installation with an optical path length of
several meters, the influence of the purging gas on the effective
path length can be ignored.
The maximum possible path length and dust load mutually affect
each other: the higher the dust load in the process, the shorter
the max. possible path length.
Receiver unit
Connecting
cable (optional)
Customer flange
Cable gland
Purging tube
(optional)
Sensor connecting cable
(optional)
Reference cell integrated
into receiver unit
Cable gland
Sensor connecting
cable (optional)
Design of the non-Ex version of the SITRANS SL system
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© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Connection cable
Analog-I/O, Modbus
Transmitter unit
Connection cable
PROFIBUS DP
Receiver unit
Connection
cable
2
ATEX cable
gland
Remote control
ATEX cable
gland
Cable gland
~1 m
~1 m
Lmax= 25 m
Ex-e junction box
Ex-e junction box
Design of the ATEX version of the SITRANS SL system
Conduit connection 1/2” NPT
(not shown)
Conduit connection 1/2” NPT
(not shown)
Transmitter unit
Ui: 30.2 V DC
Pi: 10 VA
Receiver unit
Remote control
FM label
Conduit connection 1/2” NPT
(not shown)
Design of the FM version of the SITRANS SL system
The transmitter and detector units are mounted on process
flanges provided by the customer. Correct alignment of these
flanges must be guaranteed, e.g. by using the optional sensor
alignment kit.
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FM label
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Adjustment of the pair of sensors
The flange connection plates (process interface) of the
SITRANS SL to the process flanges on the customer side must
be correctly aligned so that the laser beam generated by the
transmitter hits the photodetector in the detector unit This is
guaranteed in that the transmitter and detector units have a
curved surface integrated in the connection plates. The adjustment is carried out by shifting the flanges on these surfaces,
through which the symmetry axis is aligned. The axis can be offset by ± 1 degree, which means that the process flanges must
be welded onto the process wall with at least this accuracy - see
following figure.
Min. 150 mm
2
Approx. 25 to 40 mm
PROCESS
Maximum deviation
± 1°
Process flange
Wall thickness
(incl. insulation)
Is measured following installation
Installation/adjustment requirements for the pair of cross-duct sensors
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Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Purging
2
The easiest way to avoid condensation and dust deposits on the
sensor windows or excessively high thermal load of the windows
and the sealing material as well as the sensor electronics is to
purge them (with O2 application: nitrogen). Purging must be selected depending on the application. The transmitted-light sensors can therefore be configured for the respective situation. The
application reference table provides recommendations for suitable purging for the standard applications.
If oxygen is to be measured with the SITRANS SL - which is also
present in measurable quantities in the ambient air - oxygen-free
purging gases must be used, such as nitrogen. It is equally necessary to purge the inside of the sensor heads, since the ambient air must also be displaced here out of the laser beam path.
A differentiation is therefore made between purging on the process side and purging on the sensor side.
Input for purging on the process side
Optics tube (transmitter or receiver)
Output for
purging on the sensor side
Process flange
Purging tube
Flange connection plate
(process interface)
Input for purging on the sensor side
Arrangement for purging on the sensor side of the SITRANS SL
Purging on process side
For purging on the process side, the flow of purging gas can be
adjusted between 0 and approx. 50 l/min at each sensor head
using a needle valve (included in delivery).
Purging on sensor side
This can be combined with the purging on the process side, if
required. Purging with nitrogen on the sensor side is almost always necessary for O2 applications to avoid an offset caused by
the oxygen of the air present in the unit. The cells in the sensor
head are then continuously purged with nitrogen. Particularly
when (re)starting the SITRANS SL O2, a sufficiently high flow of
purging gas of approx. 3 to 5 l/min must be provided for several
minutes to ensure that all residues of oxygen are removed. The
flow of sensor purging gas can subsequently be set to a lower
value using the needle valve (included in delivery).
Note:
With purging on the process side, it may be necessary to use
non-return valves to ensure no process gas can enter the purging gas line in the event of failure of the purging gas supply. This
applies especially in the case of cascaded process and sensor
purging where there is otherwise the danger that, for example,
corrosive process gases could enter the sensor enclosure.
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Sensor head (transmitter or receiver)
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Purging tubes
The purging media used on the process side flow through purging tubes into the process gas stream. The tubes extend into the
process area by a few centimeters, usually perpendicular to the
process gas stream. This means that an exactly defined optical
path length is defined through the sample gas. The effective
measuring path in the process gas is therefore defined as the
distance between the ends of the two purging tubes. The standard length of the purging tubes is 340 mm. To enable sufficient
alignment, the process wall should be max. 150 mm thick.
2
Optical path length
Process wall
Purging tube
Measurement of the optical path length between the ends of the purging gas tubes
Maintenance and fault messages
Note
The SITRANS SL carries out continuous self-monitoring, and
outputs alarms and warnings to indicate maintenance requirements or a system fault. The information is output as plain text on
the LUI display, where symbols identify the category and the severity of the fault.
Specific requirements for the measuring point can make the utilization of special sensor equipment necessary. The possibilities
for adapting the sensors are:
• Special materials for purging tubes (on request)
• Various types/sizes of sensor flanges
• Explosion-protected sensor configurations
Alarm categories:
• Maintenance (system must be cleaned or repaired)
• Process value (problem with external sensor, or process conditions outside the permissible range for SITRANS SL)
• Configuration (SITRANS SL is not correctly configured)
Severity:
• Fault (measurements could not be carried out)
• Warning (measurements may be inaccurate, or the system will
soon shut down measuring mode if an intervention is not
made)
• Advanced warning/information
(measurements are carried out)
The two binary (relay) outputs can be configured freely for the
alarm output.
The response of the analog outputs in the event of an alarm is
configurable; possible actions are:
• Off (current measured value is displayed)
• Last measured value (freezing of last value displayed)
• Standard level (setting to predefined value)
• 3 mA (NAMUR NE43 fault status)
Essential characteristics
• Long-term stabilization through use of an internal reference
cell; calibration interval at least one year
• Dynamic background correction for varying dust loads
• Isolated signal outputs of 4 to 20 mA
• User-friendly, menu-driven operation
• Selectable time constants (response time)
• Password-protected user interface
• I/O operation in accordance with NAMUR recommendations
• Monitoring of overall optical transmission
• Sensor enclosure resistant to wear and corrosion
• Simple local operation using remote-control unit with numeric
keypad and menu prompting
In addition, the transmission is available as an output variable.
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© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Standard applications
The following table lists the measuring conditions for standard
applications. The listed values for the measuring range and detection limit are only approximate values. The exact values at the
respective measuring point depend on the totality of all influencing variables and can be determined by Siemens for the specific
case. Please note that the values for the detection limit and the
2
Standard application
Effective optical path
length: 0.3 … 8 m
Dust load2): < 50 g/Nm3
maximum measuring range refer to a path length of 1 m. Longer
path lengths will improve the detection limit, but not linearly. due
to limiting effects such as dust load. The maximum applicable
measuring ranges can only be used if permitted by the process
conditions such as dust load.
Process gas Process gas
temperature pressure
Tmin … Tmax pmin … pmax
Min.
measuring
range
(with 1 m
eff. opt. path
length)
Max.
measuring
range
(also dependent
on eff. opt. path
length: see following column)
Max.
measuring
range x path
length
DL x path
Repeata- Purging
length
bility3)
gas
(under
medium
standard
conditions1)
without
cross-interference of
other gases)
Sample
gas component
Gas Appl.
code code
O2
A
B
0 … 600 °C
900 ... 1 100 hPa
0 … 1 vol%
0 … 100 vol%
75 vol%*m
200 ppmv*m
2%
N2
O2
A
C
0 … 200 °C
700 … 5 000 hPa 0 … 1 vol%
0 … 100 vol%
75 vol%*m
200 ppmv*m
2%
N2
CO
J
C
-20 … 700 °C 700 ... 2 000 hPa, 0 … 100 ppmv 0 … 6 000 ppmv 2 000 ppmv*m 0.6 ppmv*m4) 2 %
max. 300 °C
800 ... 1 200 hPa,
above 300 °C
Air, N2
Reference table: Standard applications. The specified pressures are absolute.
DL = detection limit
1)
At 20 °C, 1 013 hPa, without dust
2)
With 0.3 m effective optical path length
Average diameter of the dust particles: 15 µm
Specific weight of the dust particles: 650 kg/m3
The influence of dust load is extremely complex, and depends on the path length and particle size. The optical attenuation increases exponentially at longer
path lengths. Smaller particles also have a very large influence on the optical attenuation. With high dust load, long path length and small particle size, the
technical support at Siemens should be consulted.
3)
Referred to measuring range.
With stable or externally measured and software-compensated process gas temperature and pressure conditions.
4)
The measurement of CO can be significantly affected by hydrocarbons, such as CH4. Ensure there is no CH4 in the process or contact Siemens and describe
the process conditions using the provided application questionnaire (see below).
Special applications
In addition to the standard applications, special applications are available upon request. If the process
conditions deviate from the specifications of the standard applications, special applications are also
possible on request. Please complete the application questionnaire which can be found at
www.siemens.com/insituquestionnaire on the Internet.
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Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Technical specifications
Analytical performance
Design, enclosure
Measuring range
Internally adjustable
Degree of protection
IP65 according to EN 60529
Detection limit at standardized
conditions:
25 °C gas temperature, 1 000 hPa,
1 m effective optical path length, 3 s
integration time and constant ambient conditions.
O2: 200 ppmv
CO: 0.6 ppmv
Dimensions
For each unit
(transmitter, detector)
• Diameter: 165 mm
• Length: 357 mm
Purging tube
Linearity
(under standard conditions)
Better than 1 %
Length, outer diameter, inner
diameter:
340, 48, 44 mm
Repeatability
(under standard conditions)
O2: 1 % of the measuring range
CO: 0.5 % of the measuring range
Weights
General information
Design
Transmitter and detector units,
connected by a sensor cable
Materials
• Sensor enclosure: treated
aluminium/stainless steel
(1.4305/303)
• Process interface: acid-resistant
stainless steel (1.4404/316L)
• Window: hardened borosilicate
glass
• Compressible gaskets: FKM,
FFKM, EPDM (holder for reference cell)
• Flat gaskets: Graphite
Parts wetted by the process gases
• Purging tubes, flanges, window
ring, process purging: acid-resistant stainless steel
• Window: Borosilicate
• Gasket in window: FFKM
• Flat gasket between customer
flange and process flange: Graphite
Installation
In-situ or bypass
Concentration units
ppm, vol. %, mg/Nm3
Display
Digital concentration display
(4 digits with floating decimal
point)
Laser protection class
Class 1, safe to the eye
Explosion protection
Optionally, according to
• ATEX II 2G Ex de op is IIC T6
ATEX II 2D Ex tD A21 IP65
T85 °C
• FM Class I, II, III Div 1 Groups A,
B, C, D, E, F, G T6
FM Class I, Zn 1, AEx d IIC T6
FM Class II, Zn 21, AEx td
T85 °C
• XP Class I, II, III Div 1 Groups C,
D T6 Ta = 55 °C;
DIP Class II,III Div 1 Groups E, F,
G T6 Ta = 55 °C; Class I, Zn 1,
Ex d IIC T6 Ta =55 °C; Zn 21, Ex
tD T85 °C Ta = 55 °C
• Detector unit
6.0 kg
• Transmitter unit
5.2 kg
• Process interface
- for DN 50/PN 25
5.3 kg
- for ANSI4’’/150 lbs
Approx. 12 kg
Connection dimension customer
flange
DN 50/PN 25, DN 50/PN 40 or
ANSI 4"/150 lbs
Electrical characteristics
Power supply
24 V DC nominal (18 ... 30.2 V DC)
Power consumption, maximum
10 VA
EMC
In accordance with EN 61326-1
Electrical safety
In accordance with EN 61010-1
Fuse specifications
T1.6L250V
Dynamic performance
Warm-up time at 20 °C ambient
temperature
Approx. 15 min
Response time (T90)
Approx. 2 s,
depends on application
Integration time
0 ... 100 s, selectable
Influencing variables
Variations in ambient temperature
< 0.5 %/10 K of the measuring
range
Process gas temperature
With compensation: < 1 %/100 K
of the measuring range
Variations in atmospheric pressure
Negligible
Process gas pressure
O2: With compensation:
< 1 %/4 000 hPa of the
measuring range
CO: Negligible
Variations in supply voltage
Negligible
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Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Electrical inputs and outputs
2
Measuring conditions
Number of measurement channels
1
Analog outputs
2 outputs, 4 ... 20 mA, floating,
ohmic resistance max. 660 Ω.
External isolating power supplies
may have to be provided by the
customer.
Analog inputs
2 inputs, designed for 4 ... 20 mA,
120 Ω
Digital outputs
2 outputs, with switchover contacts, configurable, 24 V/0.5 A,
floating, single pole double throw
(SPDT)
Measurement path
0.3 ... 8 m (other lengths: please
contact Siemens)
Process gas pressure, temperature
• O2: 900 ... 1 100 hPa,
0 … 600 °C
• O2: 700 … 5 000 hPa,
0 … 200 °C
• CO: 700 … 2 000 hPa,
-20 … 300 °C
• CO: 800 … 1 200 hPa,
300 … 700 °C
Dust load
The influence of a high dust load
is complex, and depends on the
optical path length and particle
size distribution.
Digital input
1 input, designed for 24 V,
floating, configurable
Service port
Ethernet 10BaseT (RJ-45)
Purging
RS 485 PROFIBUS DPV0 version
Two-wire interface, up to 3 Mbit/s,
-7 … 12 V
Purging gas
RS 485 Modbus version
Two-wire interface, up to
115 200 bit/s, -7 … 12 V
• Nitrogen
(for O2 and CO applications)
• Instrument air
(for CO applications)
• Quality
O2 application: Purity better than
99.7 % in order to achieve full
performance. For oxygen measurements, an O2 content
< 0.01 vol. % in the purging gas
is recommended.
< -10 °C, condensation on the
optics must be avoided
Cable to customer interface (not included in standard delivery,
permanently installed for ATEX, optionally available for Standard)
Analog connection cable
(with ATEX configuration: only
supplied cables may be used!)
10 x 2, with shielding in twistedpair configuration (depending on
type and number of I/Os used)
PROFIBUS DP connection cable
(with ATEX configuration: only
supplied cables may be used!)
1 x 2 + 4 (PROFIBUS DP hybrid
cable)
• Dew point
Modbus connection cable
(with ATEX configuration: only
supplied cables may be used!)
1 x 2 + 3, with shielding in
twisted-pair configuration
• Max. overpressure in the sensor
500 hPa
0 ... +55 °C
Cable length for ATEX configuration
3m
• Purging gas temperature
on sensor side
Conductor cross-section
Min. 0.34 mm²
• Flow
Cable diameter
8 ... 12 mm or 13 ... 18 mm
Minimum bending radius
ATEX-PROFIBUS
110 mm
O2 application: When commissioning a sensor enclosure previously filled with air: 3 ... 5 l/min
(for at least 15 min), subsequently: at least 0.25 l/min
Sensor purging
Sensor cable (not included in standard delivery, permanently
installed for ATEX, optionally available for Standard)
Purging on the process side
(optional)
Sensor cable type configuration
• Pressure at purging gas inlet
2 000 ... 8 000 hPa
• Flow
Dependent on process gas
pressure, process gas velocity,
dust load, moisture, etc. up to
max. 50 l/min
4 x 2, with shielding,
in twisted-pair configuration
Conductor cross-section
Min. 0.34 mm²
Cable sheath
PUR (polyurethane)
Dimensions
• Diameter: 11 mm
• Length: up to 25 m
Minimum bending radius
ATEX: 85 mm
Climatic conditions
Ambient temperature range
• -20 ... +55 °C during operation
(additional solar radiation not
permissible!)
• -40 ... +70 °C during transport
and storage
Temperature range on the sensor
side of the process interface (connection plate)
-20 ... +70 °C
Atmospheric pressure
800 ... 1100 hPa
(for ATEX and FM version)
Humidity
< 100 % rel. humidity
2/42
Siemens AP 01 · 2015
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Accessories
SITRANS SL sensor alignment kit
Calibration test kit
The SITRANS SL sensor alignment kit includes a battery-operated lamp, a centering aid with crosshair, and two hook spanners for loosening the sensors from the flange connection plates.
The SITRANS SL has already been factory-calibrated. If it is desirable or necessary to check the calibration, this can be performed using an external calibration test kit following removal of
the transmitter and detector units. This procedure has no influence on the optical adjustment of the unit since the flange connection plates remain mounted on the customer flange. The calibration test kit for O2 consists of a stainless steel calibration
tube and a thermometer. To carry out the calibration, it is
mounted between the transmitter and receiver. The calibration
tube for O2 can then be filled with air or a calibration gas.
Please note:
The SITRANS SL sensor alignment kit is not explosion-protected! Therefore it must never be used in a hazardous area
without approval by the plant operator!
Thermometer
Transmitter
Calibration tube for O2
Receiver
Needle valves
ATEX adapter cable
Calibration validation setup of SITRANS SL O2
Siemens AP 01 · 2015
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2
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Dimensional drawings
Note
the SITRANS SL sensors must be accessible from the side.
A space of at least 60 cm must be provided next to the
SITRANS SL transmitter and detector units in order to facilitate
maintenance and servicing.
To fulfill the safety requirements, a clearance of at least 10 cm
must be provided around the SITRANS SL to maintain cooling.
Process purging input
/RRSFDEOHMXQFWLRQER[
$7(;YHUVLRQRUDVDQRSWLRQ
112
Process interface
Purging tube
163
Process flange
2°
Sensor purging input
340
357
SITRANS SL, transmitter/detector unit (same housing for DN 50/PN 25 process interface version), dimensions in mm
2/44
Siemens AP 01 · 2015
Ø 9"
Ø 7½"
Ø 125 mm
Connection dimensions of process flanges provided by customer DN 50/PN 25 and ANSI 4’’/150 lbs
Ø 4"
Ø 3/4"
(for 5/8” screwed gland)
Ø 18 mm
(for M16
screwed gland)
Ø 50 mm
2
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
■ Schematics
Electrical connections
Non-EEx version: connection cable - customer interface
Terminal block in the receiver enclosure
Function/voltage
1
+
2
-
Power supply
19 … 30.2 V, 10 VA1)
3
Normally closed under power4)
Binary output 0 (relay)
30 V, 0.5 A3)
Normally closed under power4)
Binary output 1 (relay)
30 V, 0.5 A3)
7
+
8
-
Binary input 0
0 … 30 V2)
9
+
10
-
11
+
12
-
13
PROFIBUS A line
(RxD/TxD_N - data inverted)
14
PROFIBUS B line
Modbus D0
(RxD/TxD_P - data not inverted) (RxD/TxD_P - data not inverted)
15
PROFIBUS/Modbus shield
16
T x+
17
T x-
Orange
18
Rx+
White/green
19
Rx-
Green
20
+
21
-
22
+
23
-
4
5
6
Ethernet cable
2
Analog output 0 (measurement)
30 V, 24 mA3)
Analog output 1 (measurement)
30 V, 24 mA3)
Modbus D1
(RxD/TxD_N - data inverted)
RS 485
(PROFIBUS/Modbus)
-7 ... +12 V DC
Ethernet5)
White/orange
Analog input 0 (temperature)
0 … 30 mA2), 120 Ω
Analog input 1 (pressure)
0 … 30 mA2), 120 Ω
24
Grounding
25
Grounding
Ground
Grounding
Ground
Grounding
Shielding
1)
This is the maximum power consumption of the SITRANS SL
2)
These are the maximum input values
3)
These are the maximum output values
4)
Note:
"Normal operation" stands for normal operation of the analyzer. The system is connected to the voltage source and is running without problems;
no error message generated or displayed.
"Normal under power" refers to the status of the relay under the above-named normal operation. The relay contact of the alarm signal is closed.
5)
We recommend that the Ethernet connection is not made via the cable to the Ethernet terminals in the detector unit. Instead, the Ethernet connection should
be made via the sensor cable connection set which is optionally available for the detector unit.
Siemens AP 01 · 2015
2/45
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Examples of digital output and analog output
Terminal strip in
terminal box
Function
Color code
1
+
-
24 V DC voltage supply
for transmitter unit
Red
2
3
Com +
Communication with transmitter
Pink
4
Com -
Gray
5
Sync + Synchronization with transmitter
White
6
Sync -
Brown
7
NC
Not used
-
8
Tx+
Ethernet
Gray/pink
9
Tx-
Red/blue
V0 can be up to 30 V
10
Rx+
Black
Rload must be at least 60 Ω
(max. 0.5 mA in relay)
11
Rx-
PE
terminal
-
> SITRANS SL
Customer side <
Imeas
3
V0
2
Rload
4
Example of digital output 0
Customer side <
Imeas
V0
Rload
> SITRANS SL
9
10
V0 must be min 7.5 and max 30 V
Rload can be maximum
V0 - 7.5
Ω
0.025
Example of analog output 0
Caution:
Please note that an external isolating power supply may be
required!
2/46
Sensor cable terminal box on the receiver side (ATEX version)
Siemens AP 01 · 2015
Blue
Violet
Grounding
Green
PE
terminal
Grounding
Yellow
Gland
Grounding
Shielding
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
Selection and ordering data
Article No.
SITRANS SL in-situ gas analyzer
7MB6221- 7 7 7 7 7 - 7 7 7 7
Cannot be combined
Click on the Article No. for the online configuration in the PIA Life Cycle Portal.
Explosion protection
Without
Ex II 2 G Ex de op is IIC T6
Ex II 2 D Ex tD A21 IP65 T85°C
FM USA:
XP Class I, II, III Div 1 Groups A, B, C, D T6 Ta = 55°C
DIP Class II,III DIV 1 Group EFG Ta = 55°C
Class I, Zn 1, AEx d IIC T6 Ta = 55°C
Zn 21, AEx tD T85°C Ta = 55°C
FM Canada:
XP Class I, II, III Div 1 Groups C, D T6 Ta = 55°C
DIP Class II,III DIV 1 Group EFG
Class I, Zn 1, Ex d IIC T6 Ta =55°C
Class II, III Zn 21, Ex t IIIC T85°C Ta = 55°C
Measured component
O2
CO
0
1
0
1
2
2
2
2
A
J
Application examples1)
Control of combustion processes
Process control, safety monitoring in appropriate plant concepts
Communication interface
Analog
PROFIBUS DP
Modbus
A
J
B
C
B
B
0
1
2
Purging tubes, material
No purging tubes
Stainless steel
Length
Purging mode, process side
Sensor side
No purging
No purging
No purging
3 ... 5 l/min
0
1
0 ... 50 l/min
0 ... 50 l/min
No purging
3 ... 5 l/min
2
3
340 mm
0
1
0
1
2
Process interface 2)
Connection dimension ANSI 4" 150 lbs (EN 1.4404/316L), MAWP (PS) @ 20 °C: 232 psi
B
Connection dimension DN 50/PN 25 (EN 1.4404/316L), MAWP (PS) @ 20°C: 2.5 MPa
C
Connection dimension DN 50/PN 40 (EN 1.4404/316L), MAWP (PS) @ 20°C: 4.0 MPa
E
E
Sensor cable
5m
10 m
25 m
with brass cable gland
with brass cable gland
with brass cable gland
A
B
C
A
B
C
A
B
C
5m
10 m
25 m
with stainless steel cable gland
with stainless steel cable gland
with stainless steel cable gland
D
E
F
D
E
F
D
E
F
Without cable
Documentation language
German
English
French
Spanish
Italian
X
X
0
1
2
3
4
1)
The examples shown represent possible applications where appropriately configured SITRANS SL solutions can be used. The user is responsible for the prevailing
conditions (plant concept (possibly redundant), application of appropriate components required in addition, compliance with possible directives, etc.).
2)
MAWP: Maximum Allowable Working Pressure
Siemens AP 01 · 2015
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© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
In-situ O2 and CO gas analyzer
2
Selection and ordering data
Additional versions
Add "-Z" to Article No. and specify Order code
Acceptance test certificate 3.1 (leak test) in accordance with EN 10204
Acceptance test certificate 3.1 (material certificate) in accordance with EN 10204
SIL 1 conformity declaration in accordance with standards IEC 61508/IEC 61511
(for the measured component oxygen in combination with analog interfaces)
TAG label, customized inscription
1)
Order code
C12 1)
C13 1)
C20 1)
Y30
Together with explosion protection as per FM, on request
Selection and ordering data
Additional units
Calibration verification kit O2, SITRANS SL
Calibration verification kit CO, SITRANS SL
SITRANS SL sensor alignment kit
Ex-e junction box for 25-wire cable
Cable set analog (for non-Ex SITRANS SL)
Cable set PROFIBUS DP (for non-Ex SITRANS SL)
UV protective hose for outdoor use, ND = 48 mm, per 30 m
Sensor connecting cable set
• 25 m
• 10 m
•5m
Spare parts
Process interface DN 50 PN 10 ... 40 incl. gasket
Gasket DN 50/PN 10 ... 40
Process interface ANSI 4" Class 150 incl. gasket
Gasket ANSI 4" Class 150
Purging tube 340 mm incl. gasket for DN 50/PN 10 ... 40
Window lid for receiver housing
Lid for transmitter housing
Cable, analog, brass, EX
Cable, analog, VA, EX
Cable, PROFIBUS, brass, EX
Cable, PROFIBUS, VA, EX
Cable, transmitter, VA, EX
Junction box, transmitter, VA, EX
Junction box, transmitter, brass, EX
Cabeling, transmitter, brass, EX
Interconnection cable 5 m
Interconnection cable 10 m
Interconnection cable 25 m
Cable, receiver, VA, EX
Junction box, receiver, VA, EX
Cabeling, receiver, brass, EX
Cable gland kit, non-EX
Clamp ring
Light source with adapter
LUI
Remote control IS, CSA, FM, ATEX
Needle valve kit
Capillary kit
2/48
Siemens AP 01 · 2015
Article No.
Item number (see figure
on the next page)
A5E01000694
A5E03090938002
A5E01000740
A5E01267567
A5E03328474
A5E03328473
A5E01714061
A5E02528052
A5E02528048
A5E02509347
3+4+5
3+4+5
3+4+5
A5E01009881
A5E02522036
A5E01009883
A5E02789535
A5E01009892
A5E01009897
A5E02568437
A5E02608597
A5E34834297
A5E02608594
A5E34834296
A5E34830928
A5E34831075
A5E02091532
A5E02568463
A5E02571180
A5E02571184
A5E02571186
A5E34831050
A5E34831078
A5E02568465
A5E02568457
A5E01010033
A5E33259745
A5E31503119
A5E02091214
A5E02569944
A5E02183375
6
6
6
6
2
1
1
1+2
5
5
5
4
3
3+4
© Siemens AG 2015
Continuous Gas Analyzers, in-situ
SITRANS SL
Documentation
■ Selection and ordering data
Manual
Article No.
SITRANS SL manual
• German
A5E01132949
• English
A5E01132948
• French
A5E01132951
• Italian
A5E01132952
• Spanish
A5E01132953
2
]
X
Z
Y
\
[
SITRANS SL spare parts, item numbers
Siemens AP 01 · 2015
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