EN2R--9029 0101R2--NE
3
TYPICAL APPLICATIONS
The C7195A sensor is 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
Modulation input
and/or electronic
flow switch
Modulating
control
Electronic
controller
Cold water
Temperature
feed back
Domestic hot
water
_C
_C
Fig. 3. Instanteneous combi boiler with feed forward or
feed back control loop
Temperature
feed back
Modulating
control
Modulation input
and/or electronic
flow switch
Electronic
controller
Cold water
Domestic
hot water
_C
Fig. 4. Instanteneous water heater with feed forward or
feed back control loop
For the above mentioned appliances, the sensor can be used in two specific ways:
1
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 c ompensate the tolerances and
hysteresis of the complete system.
2
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 s etting
point (to avoid ON/OFF recycling)
Safety:
Can not be blocked in ON position (the turbine can
only turn with flow).
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