FSA100 Rev1206
28
CALIBRATION
The flow calibration potentiometers are located on the summing device. (Refer to
Figure 10.)
Note: Plumbing systems are always unique and may cause small deviations
in the factory calibration. It is recommended that the calibration procedure
be performed after installation.
Calibrating Discharge Sensor(s)
Note: For multiple discharge flow sensors calibrate each sensor separately.
1. Flow water through the discharge. Ensure a constant pressure is maintained
to obtain a steady flow. Use a precalibrated pitot gauge as a reference.
2. Locate the calibration potentiometer on the flow summing box for the sensor
being tested (Refer to Figure 10).
3. Loosen the locknut on the discharge flow calibration potentiometer (pot.) Use
a small screwdriver to adjust the pot. so that the reading in the lower display
on the control module matches the reference flow. Rotating the pot. clockwise
will increase the flow rate and counter clockwise will decrease the flow rate.
Turn the pot. a little bit at a time to allow the computer averaging to catch up
to the new setting (wait for two seconds between adjustments).
4. Select a second reference flow rate to verify the calibration.
Calibrating Foam Concentrate Flow Sensors
The foam concentrate flow sensors are calibrated precisely at the factory as a part
of the metering valve assembly and should only require calibration for the following
reasons:
Calibration of the discharge sensor(s) is complete and correct, but the foam
mixture at the discharge is not correct.
The locked potentiometers for Foam 1 or Foam 2 are accidently moved.
A foam flow sensor or the summing device is replaced.
Note: Calibrate each foam flow sensor separately with the other foam flow sensor
cable disconnected.
1. Close the foam isolating valve and fill the foam tank with water.
2. Flow water at a rate of 600 GPM through any discharge.
3. Turn the foam system ON. Press and hold the OPEN button to fully open the
metering valve. Both displays will be flashing.
4. Open the foam isolating valve.
