Oval 50 - Troubleshooting

B-149-4N-E
23
13. TROUBLESHOOTING
PROBLEM PROBABLE CAUSE COPING ACTION
1. Totalizer remains
inoperative.
1. Flowrate is low. 1. Open valves progressively.
2. Insufcient pump pressure or head
pressure.
2. T aking pressure loss of entire piping assembly into
consideration, correct pump pressure or head
pressure.
3. Power line voltage is out of
specication or current carrying
capacity of power source is
inadequate.
3. Provide a 14 to 45VDC power to the register. (12 to
24VDC for open collector or voltage pulse output.)
Current carrying capacity 30mA min. is required for
power. (With analog output, 24VDC, 60mA min. is
required.)
4. Oval rotors jammed with foreign
matter; rotors locked; metered liquid
fails to run.
4. Referring to "Disassembly and Inspection" (Sec. 10),
disassemble the meter body and clean the rotors
thoroughly.
5. Oval rotors installed the wrong way. 5. Refer to 10.2 Meter Assembly
Procedure in the "Disassembly and Inspection", and
reassemble correctly.
6. Sensor installed out of position. 6. Refer to "How to Change Flow
Directions" (Sec. 7) and reinstall the sensor.
2. Unusual noise.
1. Air is entrapped.
1. Reduce owrate and eliminate air completely in the
piping assembly.
2. Vaporized metered liquid in the
piping assembly.
2. Reduce owrate and control metered uid
temperature and pressure to prevent vaporization.
3. Oval rotors revolving in contact with
measuring chamber.
3. Refer to "Disassembly and Inspection" (Sec. 10), and
disassemble and inspect for condition.
3. Liquid leaks. 1. Incomplete seal of the pipeline. 1. Retighten bolts at pipeline connections or replace
gaskets with new ones.
2. Incomplete seal on front/rear cover
of meter body
2. Inspect front/rear cover tting bolts for tightness and
replace O-rings with new ones.
4. Counts while valves
remain closed.
1. Valve and pipeline leaks. 1. Inspect valves and pipeline.
2. Air pockets between valve and
Ultra OVAL; rotors in rocking motion
in response to pump's pulsating
pressure.
2. Vent air.
Provide a check valve and accumulator.
3. Supply power voltage uctuates. 3. Eliminate voltage uctuation.
5. Analog output
unusual.
1. Load resistance too great. 1. Referring to "Load Resistance
Range" on page 12, check load resistance to power
supply voltage relationship and keep them within the
specied range.
6. Accumulated total
too high.
1. Rotors in rocking motion in response
to a pulsating ow.
1. Add a check valve and accumulator.
2. Inuenced by external magnetic
elds (Meter sensor picks up external
magnetic elds created by a motor,
generator, etc.)
2. Keep out external magnetic elds.
3. Air entrapped. 3. Provide an air vent.
7. Accumulated 1. Inuenced by external magnetic
elds.
1. Keep out external magnetic elds.