Calibrations; If Flow Readings Are Too High; If Flow Readings Are Too Low; If It Is Necessary To Adjust The Existing K-Factor - Omega FPD-4000 Series User Manual

DON'T: Allow materials to dry inside the flow meter. When a flow meter is
removed from the line during maintenance, clean the internals immediately,
lubricate the gears, and cap the fluid ports.
DON'T: Over tighten the pick-up sensor beyond hand tight. When installing the
pickup sensor, turn it in lightly to a hand-tight torque. Do not use a wrench on
the pickup as over tightening may cause a dimple of metal under the sensor nose
to protrude into the gear cavity and interfere with the gear's rotation.
DON'T: Use water or solvent for calibration or test purposes. Water or solvent
may not turn the gears at low flow and may leave the impression that the flow
meter is not functioning. A calibration factor (kfactor) is issued with the flow
meter, which is valid for most fluids except water or equivalent viscosities.

Calibrations

Each flow meter is calibrated and given a "k-factor" using a standard calibrating
fluid at the factory. This number is accurate for all fluids with most viscosities,
except the most water-like. There should be no need to change this except for
fluid viscosities below 30cSt.

If flow readings are too high

If the display shows significantly more than the volume actually dispensed or
shows flow when there is definitely no flow, this most likely indicates an electrical
noise problem. In such cases, turn off nearby motors, heaters or relays, check
cable shielding, and establish a clean ground independent of other electrical
devices before repeating accuracy tests. If the problem continues, it may be
necessary to relocate the offending device or reroute cabling away from noise
sources.

If flow readings are too low

If the display shows significantly less than the volume actually dispensed, most
likely the flow meter has a high slippage factor, and the fluid is bypassing the
gears and the k-factor may require adjustment. Dirt or dried material can also
keep gears from rotating freely.

If it is necessary to adjust the existing k-factor

Trigger at least 500ml of your sample fluid in a steady stream at approximately
the desired flow rate into a graduated beaker. Compare the volume in the beaker
to the volume on the display. Do not time the operation; merely measure the
volume dispensed. Repeat the sample 3 times and take an average. If the
result is outside an acceptable margin, adjust the k-factor by the percentage
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