EN2R--9029 0101R2--NE
2
DESCRIPTION
The C7195A is a mechanical water flow sensor (fig. 2.).
A turbine rotates with water flow. The turbine supports a
magnet which rotates in front of a Hall effect sensor.
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
feed-- forward loop) or simply open heat demand when the
flow reaches its defined minimum rate (electronic flow switch).
The sensor body is constructed from pressure and
temperature resistant plastic, with easy connections to
traditional pipes used in domestic appliances.
Feed forward control loop concept
See fig. 1.
Electronic
Controller
Flow rate input
for modulation
Cold water
Modulating control
Heat
supply
Temperature feed back
Option: Compensation
of tolerances and
hysteresis
_C
T7335
C7195A
Domestic
hot water
Fig. 1. Feed forward control loop concept
Fig. 2. Open view C7195
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