IPF Rev0204
24
CALIBRATION
The
Portable Flow Tester
is programmed and calibrated at the factory for the
tube(s) that it is shipped with. Each new sensor/tube size program that is entered
needs to be calibrated.
It is recommended that the tester be checked for accuracy annually and recalibrated
as necessary. The calibration must be checked for all sensor/tube size programs that
are stored in memory.
To calibrate the digital flowmeter use a precalibrated water flow test kit or a pitot
gauge as a reference.
Notes:
Fully charge the battery before calibrating.
Ensure the flow sensor paddlewheel is clean and the spins freely.
Review the Programming section for details on using the Program Access Mode.
Flow Calibration, Single Point (Code 321)
Calibrate at the most frequently used flow rate or use the guidelines provided by
NFPA 1901. (Refer to Table 2.)
1. Enter code 321.
Result: The digital display will show the default sensor/tube size program.
2. Press the
TOTAL
button to change the sensor/tube size program.
3. Press both the
MODE
and
TOTAL
buttons and hold them until 0 is shown in
the display. Release the buttons.
4. Flow water through the tube at the flow rate selected for the calibration point.
Ensure a constant pressure is maintained to obtain a steady flow rate.
5. Adjust the tester displayed flow rate to match the reference flow rate.
Use the
MODE
button to select the digit that is to be changed. The digit will
flash.
Use the
TOTAL
button to change the value of the flashing digit.
6. Press both the
MODE
and
TOTAL
buttons and hold them until four dashes
are shown in the display. Release the buttons and enter a new code or after 3
seconds the program will time out and return to normal operation.
7. Vary the water flow through the discharge and ensure the displayed flow rate
matches the reference. If there are differences at other flow rates the multiple
point flow calibration may be necessary.
