product handbook

C7195A2/B/C
WATER FLOW SENSOR
PRODUCT HANDBOOK
APPLICATION
The sensor is primarily designed to measure the Domestic
Hot Water (DHW) flow rate in domestic appliances as follows:
• Combi boiler
• Instanteneous Water Heater (IHW)
• Other systems such as applications where the instanteneous DHW is produced from district heat input.
Subject to change without notice. All rights reserved
Contents
General
Page
Description .......................................................................2
Typical applications ..........................................................3
C7195A2, C7195B and C7195C
Technical
Specifications ...................................................................4
Electrical specifications ....................................................5
Performance .....................................................................6
General considerations ....................................................6
Dimensional drawing ........................................................6
Various
Standards and approvals .................................................7
Ordering information ........................................................8
Associated products .........................................................8
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EN2R-9029 0311R4-NE
DESCRIPTION
Electronic
controller
The C7195A2/B/C are mechanical water flow sensors.
A wheel (A2 and C type) or a turbine (B type), rotates with
water flow.
The wheel or the turbine support a magnet which rotates in
front of a Hall effect sensor
Modulating control
Flow rate input
for modulation
This Hall effect sensor picks up the field of the magnet giving
a pulsed output.The output is directly proportional to the
water flow through the sensor.
This frequency output is easily processed by an electronic
controller which can then modulate the burner load (for feedforward loop) or simply open heat demand when the flow
reaches its defined minimum rate (electronic flow switch).
Cold water
The sensor body (the A2 and B type) is constructed from
pressure and temperature resistant plastic, with easy
connections to traditional pipes used in domestic appliances.
The C type (cartridge only) is constructed with the same
material, but it is used for integration in customized bodies or
water manifold.
C7195A2/B/C
Heat
supply
Temperature feedback
Option: Compensation
of tolerances and
hysteresys
˚C
Domestic
hot water
Fig. 1. Feed forward control loop concept
Feed forward control loop concept
See fig. 1.
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TYPICAL APPLICATIONS
The C7195A2 and B (fig. 3) and the C7195C (fig. 2) Water
Flow Sensors are designed to measure the Domestic Hot
Water (DHW) flow rate in appliances as follows:
•
•
•
Combi boiler (instanteneous or with small buffer)
Instanteneous Water Heater (IWH), gas or electric
powered.
Other systems where DHW is produced instantaneously
˚C
˚C
C7195C
Temperature
feedback
˚C
Modulating
control
Temperature
feedback
Modulating
control
Electronic
controller
Electronic
controller
Modulation input
and/or electronic
flow switch
Domestic
hot water
Domestic
hot water
C7195A2/B
Cold water
Cold water
Fig. 2. Instanteneous combi boiler with feed forward or
feed back control loop
Fig. 3. Instanteneous water heater with feed forward or
feed back control loop
o Feedback control loop
This is the traditional electronic control, reacting to the
DHW temperature sensor output. A flow detector is
needed to detect when the DHW is tapped. The
C7195 water flow sensor can be used as an electronic
flow switch with the following advantages over ON/
OFF switches:
• Flexibility:
Electronically (auto)adjustable ON-point, for
instance depending on DHW temperature setting
point (to avoid ON/OFF recycling)
• Safety:
Can not be blocked in ON position (weel or turbine
can only turn with flow).
For the above mentioned appliances, the sensor can be used
in two specific ways:
n Feed forward control loop
This is an advanced electronic control concept which
improves the DHW temperature control thanks to fast
reaction to flow rate changes. Indeed, before the
temperature sensor sees a change in hot side, the
electronic board can react promptly following the flow
measurement. A temperature sensor can be used
anyway as an option to compensate the tolerances
and hysteresis of the complete system.
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EN2R-9029 0311R4-NE
SPECIFICATIONS
Model
C7195A/B/C water flow sensor
Ambient temperature
-20 ... + 85°C
Dimensions
See fig. 9 for C7195A2
See fig. 10 for C7195B
See fig. 11 for C7195C
Fluid
Water for sanitary use
Permissible fluid temperatur
0 ... 80°C
Minimum operating flow rate
1.5 liter/minute or lower
Maximum operating flow rate
35 liter/minute
Mounting position (C7195A2 only)
• The shaft of the rotor shall be horizontal or vertical ± 5°.
See fig. 4.
• Provided the shaft of the rotor is horizontal, most
positions are acceptable, but the position as indicated in
fig. 5. is not recommended because water will remain in
the sensor when the installation is drained (frost risk).
>PPS<
1
Fig. 4. Mounting positions C7195A2
Mounting position (C7195B only)
• Recommended position for C7195B is vertical (fig. 6),
although horizontal is allowed
Fig. 5. Not recommended mounting position
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Measuring range
C7195A2: 2 ... 30 liter/min
C7195B: 2 ... 35 liter/min
C7195C: 2 ... 30 liter/min
(valid when recommended interface dimensions are
respected, see fig. 11)
Nominal output frequency
f = Q x 7.0 (Q = flow rate in l/min; f = pulse signal in Hz) with u
60 mm straight pipe on both sides.
Accuracy
C7195A2:
C7195B:
C7195C:
-30 ... +10% over 2 to 3 l/min
-20 ... +10% over 3 to 10 l/min
± 10% over 10 to 30 l/min
-30 ... +10% over 2 to 3 l/min
-20 ... +10% over 3 to 5 l/min
± 10% over 5 to 35 l/min
Fig. 6. Mounting position for C7195B
-30 ... +10% over 2 to 3 l/min
-20 ... +10% over 3 to 5 l/min
± 10% over 5 to 30 l/min
(valid when recommended interface
dimensions are respected, see fig. 11)
Withstand pressure
When a water pressure of 17.5 bar is applied, no external
leakage shall be measured and no body damage shall occur.
Water connections
C7195A2: PF 1/2” minimum 8 mm (4.4 threads)
C7195B : PF 3/4” (15 mm quick pipe connection on request)
C7195C : Not applicable
Recommended tightening torque of inlet/outlet connections
2.5 ... 3.5 Nm
Pressure drop
0.15 bar or less at 10 l/min flow rate.
(Outlet pressure is at atmospheric pressure)
Endurance
Indicated value will shift < 5% under following conditions:
10000 hr at 10 l/min and 20°C
7000 hr at 4 l/min and 45°C
or
100,000 cycles ON/OFF at 10 l/min and 45°C
Housing material
PPS
Flow limiter
Inlet port seat suitable for water flow limiter from NEOPERL®
C7195A2: type ‘MR01 FG’
C7195B: type ‘MR04 AKM’
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EN2R-9029 0311R4-NE
ELECTRICAL SPECIFICATIONS
Nominal voltage (Vcc):
Current (Isink): 10 mA
(absolute maximum:
Output saturation
voltage (Vsat) :
Electrical code (recommended)
White:
Vout
Red:
Vcc
Black:
ground
12 V (absolute maximum: 18 V)
15 mA)
Duty cycle of electrical output signal
30 ... 70%
Supply current (Icc):
< 0.4 V
with output “ON” and at
Isink = 10 mA
8 mA with output “OFF”
Cable:
1 meter cable : 45.900.419-039
Molex 5045-03A
V out
V cc
GND
Fig. 7. Electrical connection C7195A2/B/C
+ Vcc
5 ... 12 V
10 kW
Vcc
+ Vout
< 0.4 V
Hall IC
Gnd
GENERAL CONSIDERATIONS
Fig. 8. Suggested interface schematic
PERFORMANCE
When magnetic materials like iron or materials which
generates magnetism are close to the flow sensor, operation
characteristics may change.
In order to avoid the invasion of small particles like sand, iron
and rust into the water flow sensor, it is advisable to install a
mesh filter.
The waterflow to the inlet of the flow sensor should be
undisturbed to meet the accuracy specifications. If a device
causes significant flow disturbance at the inlet of the device,
contact your Honeywell representative.
Design life
10,000 hour continious operation at 10 l/minute at 20°C
7,000 hour continious operation at 10 l/minute at 45°C
or:
100,000 cycles operation (ON = 5 s/OFF = 5 s) at 10 l/minute
at 45°C.
After life test accuracy must be within ±5% of measured value
at first stage.
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DIMENSIONAL DRAWING
24.35
G 1/2 "
Molex, 5045-03A
61
36.4
>PPS<
1
11
38.5
G 1/2 "
Fig. 9. Dimensional drawing C7195A2
G 3/4"
(24)
15
H30
75
PPS
(5.5)
35
Molex, 5045-03A
Fig. 10. Dimensional drawing C7195B
R0.5
8 +0.1
0
14.8 +0.2
0
32 ±0.1
R1
R1 R1
3.5 ±0.1
R1
14
24.5 0.1
19.8 ± 0.1
30°
1.25
38
30°
1.5
Molex, 5045-03A
24.35 +0.1
3.1 0-0.1
1.35 +0.14
0
-0.2
30 -0.4
31.4 +0.25
0
30 +0.2
0
25.4 0-0.1
24.5 0.1
Fig. 11. Dimensional drawing cartridge (C7195C)
and recommended seat dimensions for customzed body or water manifold
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EN2R-9029 0311R4-NE
STANDARDS AND APPROVALS
Other countries in general accept this certification.
For more details please contact Standards and Appprovals
department, Honeywell Combustion Control Center NL05.
Approvals
The C7195A water flow sensor series have been approved
according the United Kingdom Byelaws and Regulations
Certificate N0. 9711081, and can therefore be used in
potable water applications.
Renewal of the certificate to add C7195B and C is pending.
The materials used in these sensors are the same.
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ORDERING INFORMATION
Ordering Specification number
C7195A
X
9999
Specification number:
Water flow sensor
2000 ... 2999 for C7195A
1000 ... 1999 for C7195B/C
A : Wheel concept
B : Turbine concept
C : Wheel concept
(cartridge for water manifold integration)
Fig. 12. Model number chart C7195A/B/C water flow sensor
ASSOCIATED PRODUCTS
Electronic controller
W4115C series for IWH application
W4115B series for Combi boiler application
W7073C series for Combi boiler application
SK series
SM series
MCBA series
CVBC series (S4965)
Temperature sensors
T7335 series and SO series (NTC thermistor probes), many
options available.
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EN2R-9029 0311R4-NE
Home and Building Control
Combustion Control Center Europe
Honeywell BV
Phileas Foggstraat 7
7821 AJ Emmen
The Netherlands
Tel.: +31 (-)591 695911
Fax: +31 (-) 591 695200
http://europe.hbc.honeywell.com
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