Effluent Flowmeter Instrument Calibrations
Instrument calibrations need to minimally be done yearly on all effluent flow measurement systems reporting to sanitation districts. This calibration needs to confirm that all flow rates are accurately sensed by the primary or secondary measuring device and transmitted to a flow recorder or totalizer. This instrument calibration needs to be tested at a minimum of (3) flow rates covering the range of normal operation.
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Effluent Flowmeter Hydraulic Calibrations
Hydraulic flowmeter calibrations need to minimally be done every (3) years on all effluent flow measurement systems reporting to sanitation districts. These calibrations require zeroing of the instrument and then introducing known flow rates in to the system. Our company measures known flow with an independent flowmeter that in then compared to the one installed at the site. The water source is typically taken from either a fire hydrant, water main or water supply. This is always done at a down time and the process wastewater is isolated so only the known flow rate is going through the wastewater system. The flowmeter under test is ran at a minimum of (5) different flow rates covering the range of normal operation. The known flow rates are compared to the site flowmeter and need to meet a minimum of +/- 2% accuracy or better to be in compliance.
