Omega Engineering FPR 200 - Manual (Page 10)

1. Relieve pressure in the piping system.
2. Remove the retainer ring that secures the turbine access cover.
3. Remove the access cover with a pliers, taking care not to damage
the o-ring seal.
4. Pull out the turbine assembly and the shaft.
5. Inspect the shaft for things that may have wrapped around it.
6. Inspect the turbine bearing surface for wear and elongation.
Replace as necessary.
7. Clean any rust off of the magnets that may have accumulated.
8. Reassemble the unit by placing the turbine into the body cavity
with the two magnet pockets facing inward. Place the shaft into the
turbine hole and guide it into the retaining hole in the body cavity.
Lubricate the o-ring seal with some glycerin or other lubricant and
press it into the pocket of the body. Replace the retaining ring
securely before applying pressure to the system.
Circuit recalibration (4-20mA version):
1. Place a milliamp meter into the current loop.
2. Turn off the flow going though the sensor. Adjust the OFFSET
control for a reading of 4mA on the milliamp meter.
3. Adjust the flow rate though the meter to full flow rate. Adjust the
SPAN control for a reading of 20mA on the milliamp meter. The
two controls are not interactive, so further adjustment should not
be necessary.
Circuit recalibration (0-5V
DC
version):
1. Place a voltmeter across the black & green wires of the sensor pigtail.
2. Turn off the flow going though the sensor. Verify a reading of less
than 50 mV
DC
on the voltmeter.
3. Adjust the flow rate though the meter to full-scale flow rate. Adjust
the SPAN control for a reading of 20mA on the milliamp meter.
The two controls are not interactive, so further adjustment should
not be necessary.
(10)