343

343 Temperature Transmitters
Model 343 Smart Temperature Transmitter
Introduction
Features & Benefits
Microprocessor based two-wire transmitter with automatic
cold-junction compensation ensures accurate, reliable
performance over a wide operating range
Single model accepts multiple input types, simplifying
specification and reducing spare part requirements
High accuracy, typically 0.05% of reading, guarantees
process control integrity
HART® communication allows quick, easy configuration,
saving valuable time and money
Input/output isolation supports the use of grounded or
ungrounded sensors
DIN rail and field-mountable versions allow maximum
design flexibility
Description
4
The Model 343 Temperature Transmitter incorporates
microprocessor-based electronics and advanced temperature
measurement circuitry into a small economical package that
accepts a wide range of input types and ranges.
There are two different versions of the 343. The Model 343D is
a DIN rail (to EN 50022) version suitable for mounting in
rack-type enclosures. The Model 343F is a field-mountable,
explosion-proof version packaged in an aluminum enclosure
suitable for mounting directly at the point of process control.
The Model 343F is small and lightweight, allowing it to be
directly mounted to a thermowell in applications where this is
feasible. Both the 343D and 343F use the same electronics
module, thereby reducing spare parts inventory.
The 2, 3, and 4-wire RTDs, T/Cs, mV, and ohm sensors can be
used as the sensor element. See Table 1 for a complete list of
sensor types. The transmitter has break detection circuitry on
each input terminal. Upon sensing a break in the primary
element leadwire, the transmitter output will fail-safe based upon
user-defined units. Thermocouple cold junction compensation
is performed automatically using an internal sensor or external
two-wire RTD.
4.48
The transmitter output range can be set in engineering units
anywhere within the operating range for the input sensor type.
There is no minimum or maximum span limitation.
The Model 343 can install one of two local indicators. The LCD
Display is a simple 4-1/2 digit display. The SmartDisplayTM
indicates in °C or °F, but also contains a second line of
display and integral push-buttons that are used to configure
the transmitter.
The Model 343 uses the HART communications protocol. This
ensures that it will work with any HART product available today,
including the Moore 275 HART Communicator, PC-based
maintenance software packages, and distributed control systems.
HART also provides multi-dropping capability where up to
15 transmitters can be connected on a single twisted
pair conductor. Multi-drop networks minimize cost
considerably and are especially useful in tank gauging and
temperature measurement.
343 Temperature Transmitters
Model 343 Smart Temperature Transmitter
Technical data
Specifications
Functional Specifications
Performance Specifications
Update Rate
Digital Input Accuracy
150 ms
±0.05% of the equivalent millivolt or ohm reading,
or the accuracy shown in Table 1, whichever is
greater.
Input/Output Isolation
Cold Junction Measurement Accuracy
±0.5°C (±0.9°F)
D/A Output Conversion Accuracy
±0.05% of span
Total Accuracy
[(Input Accuracy)2 + (Cold Junction Accuracy)2+
(D/A Accuracy)2]
250 Vac/800 Vdc
Humidity
5 to 100% RH
Damping
Adjustable from 0 to 32 seconds
Fail-safe Current
User-selectable between low (3.6mA), high (23mA) or off.
Power Supply
Ambient Temperature Range
12-42 Vdc
Electronics: -40 to 85°C (-40 to 185°F)
Display: -20 to 70°C (-4 to 158°F)
Hazardous Area Classification /Approvals
Stability
Less than 0.05% of reading ±3.6 mA for 12 months
Power Supply Effect
±0.005% of span per volt
EMI/RFI Susceptibility
Less than 0.5% of reading at 10V/m, 20KHz-1000MHz
Mechanical Specifications
Din Rail (343D)
CE Approved
4
FM/CSA
Intrinsically Safe:
Class I, Division 1, Groups A, B, C & D
Class II, Division 1, Groups E, F & G
Class III, Division 1
Explosion Proof:
Class I, Division 1, Groups B, C & D
Class II, Division 1, Groups E, F & G
Class III, Division 1
Non-Incendive:
Class I, Division 2, Groups A, B, C & D
Housing
Plastic
Electrical Connections
1650
Weight
4 oz.
Dimensions
See Installation Drawing
Field-Mountable Enclosure (343F)
Housing
Epoxy coated cast aluminum, IP66/68
Electrical Connections
Quantity of 2 conduit entrances; 1/4" - 1/2" NPT
Screw Terminals for 10-26 AWG
Weight
Network Resistance (OHMS)
Screw Terminals for 10-26 AWG
1200
1100
1000
800
600
500
OPERATING
REGION
250
0
0
10V 12V
17V 20V
24V
30V
34V
40V 42V 45V
Minimum Power Supply Voltage (VDC)
2.7 lb. (1.2 kg)
Dimensions
See Installation Drawing
4.49
343 Temperature Transmitters
Model 343 Smart Temperature Transmitter
Technical data
Table 1 Input Sensor Types & Accuracy
SENSOR INPUT
ACCURACY1
INPUT RANGE
°C
°F
RTD - 2,3,4-Wire
100Ω Pt DIN α = 0.00385
-200 to 850
-328 to 1562
±0.14°C
-200 to 650
-328 to 1202
±0.14°C
120Ω Ni
-80 to 320
-112 to 608
±0.14°C
100Ω Ni
-60 to 250
-76 to 482
±0.14°C
10Ω Cu
-70 to 150
-94 to 302
±0.14°C
100Ω Pt SAMA α = 0.003902
Thermocouples
4
Type B NBS
43 to 1800
109 to 3272
±0.8°C (1.5°F)
Type C NBS
0 to 2320
32 to 4208
±0.8°C (1.5°F)
Type E NBS
-270 to 1000
-454 to 1832
±0.3°C (0.5°F)
Type J NBS
-210 to 1200
-346 to 2192
±0.3°C (0.5°F)
Type K NBS
-270 to 1372
-454 to 2502
±0.3°C (0.5°F)
Type L NBS
-200 to 900
-328 to 1652
±0.3°C (0.5°F)
Type N NBS
270 to 1300
518 to 2372
±0.3°C (0.5°F)
Type R NBS
50 to 1768
122 to 3214
±0.8°C (1.5°F)
Type S NBS
-50 to 1768
-58 to 3214
±0.8°C (1.5°F)
Type T NBS
-270 to 400
-454 to 752
±0.3°C (0.5°F)
Type U NBS
-200 to 600
-328 to 1112
±0.8°C (1.5°F)
Millivolt
mV
-15 to 115 mV
±0.01 mV
Ohm Input
ohm
0 to 500Ω
1) Accuracy includes the effects of linearity, repeatability, hysteresis and ambient temperature.
4.50
±0.06Ω
343 Temperature Transmitters
Model 343 Smart Temperature Transmitter
Ordering data
Model Number
DIN Rail Transmitter
Field-Mount Transmitter
Output
• 4-20 mA, Smart Transmitter
w/HART Protocol
Local Indicator
• Not Required
• LCD Display1
• SmartDisplay2
Standard Options
• None
• Special Features (Please Describe)
Mounting Bracket
• Not Required
• 2" Pipe Mount w/SS Hardware3
• Universal Mount w/SS Hardware3
• 2" Pipe Mount all SS3
• DIN-Rail Clip4
Housing
• Not Required4
• Aluminum 1/2" NPT3
• Aluminum M20 x 1.53
Hazardous Area Approvals
• FM/CSA & ABS Type Approved
• CENELEC EEx ia
• CENELEC EX N
• CENELEC EEx d
• Not Required
• FM/CSA I.S. only (34D only)
Installation Drawings
Order No.
343D343F■ ■ ■ ■ -■ ■
▲▲▲▲ ▲▲
2.35
(59.7)
Dia.
A
1
N
1
5
4
2.13
(54.1)
-
+
Front View
N
Y
2.95
(75.0)
1.93
(49.0)
N
1
2
3
5
Dimensions are in
inches (millimeters)
N
1
2
3
8
9
M
N
P
4
Side View
Model 343D Dimensions
(Shown with LCD Display Module)
Model 343D Dimensions (Shown with LCD Display Module)
Model 343F Dimensions
1) No indication of engineering units.
2) Indicates engineering units & includes push-buttons for local operation.
3) Model 343F Only.
4) Model 343D Only.
4.51
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