DFA400 Rev150730
26
CALIBRATION
The owmeter is precalibrated and tested at the factory. Plumbing systems
are always unique and may cause small deviations in the factory calibration. It is
recommended that the owmeter is checked after installation for accuracy and calibrated
when necessary.
Review the Programming Section procedures for using the Program Access Mode.
Error Code E204
If error code E204 is shown, there is no signal from the ow sensor. This code
is displayed only when in a calibration program. Troubleshoot the sensor and the
associated wiring.
Note: To calibrate the owmeter, use a precalibrated water ow test kit
(connected to the discharge according to the instructions provided) or a
Pitot gauge as a reference.
Flow Calibration, Single Point (Code 321)
Select a ow rate for calibration that is within the most commonly used discharge
ow range.
1. Enter code 321.
Result: The digital display shows ow rate with the last digit ashing.
2. Flow water through the discharge at the ow rate selected for calibration.
Ensure a constant pressure is maintained to obtain a steady ow rate.
3. Adjust the displayed ow rate to match the reference ow rate.
The MODE button selects the digit to change. The digit will ash.
The TOTAL button changes the value of the ashing digit.
4. To exit the calibration program:
Press and hold the MODE button and then press the TOTAL button and hold them
until the display shows four dashes. Release the buttons and enter a new code, or
after ve seconds the program times out and returns to normal operation.
5. Vary the water ow through the discharge and ensure the ow rate displayed
matches the reference. If there are differences at other ow rates, the multiple
point calibration may be necessary.
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