
IM-P198-02
MI Issue 5
86
9. Maintenance and Troubleshooting
9.1 General information
If you are experiencing difficulties with your RIM10 flowmeter, use the following information
to identify and solve problems:
9.2 No output
Verify wiring is in accordance with all wiring diagrams in Section 4 'Electrical installation'.
1.
Check supply power to the flowmeter. Supply voltage should be 24 Vdc.
2.
Check the pickup coil for shorts, both across the coil and coil to ground. To do this,
shut off power to the flowmeter. Remove the condulet cap over the terminal board.
First, check for a short across the coil by attaching an ohmmeter to the pickup coil
wires on pins 1 and 2 of CONN3, the small 9-pin connector. The coil should have a
nominal resistance of 300 ohms at ambient temperature (Resistance will change with
temperature). Zero or infinite resistance indicates a defective pickup. If a bi-directional
meter, repeat on the 2nd coil at pins 5 and 6 of CONN3.
Next, check for a coil to ground short. Using the same two wires from the previous
example, hold one of the coil wires and make solid contact with one of the ohmmeter
leads. Take the other ohmmeter lead and touch it to the stem or to a mounting screw
on the terminal board. The ohmmeter should read infinite resistance. Zero resistance
indicates a coil to ground short and the stem and coil assembly should be replaced.
Repeat this step for the other coil wires.
3.
Check the rotor for bearing drag or seizure. To do this, check by holding the rotor
assembly between the thumb and forefinger while blowing on the rotor. If the bearings
are worn the rotor may seize or spin poorly.
4.
Check the rotor for bent blades or a bent yoke. All turbine blades are profiled for
different flow conditions. Look for blade(s), which are clearly different from the factory,
profiled blades. The yoke, which houses the turbine, is usually damaged when the gate
valve is inadvertently shut before the turbine is fully retracted. Over-inserting the rotor
into the bottom of the pipe yields the same result. Be very careful when lowering and
retracting the sensor.
5.
Check the rotor for contamination. Look for debris sticking to the rotor blades. If the rotor
stops spinning, the blades may be unbalanced by debris. A contaminated blade will
always stop or unbalance the rotor. To remove heavy contaminants from the rotor or
bearings, use an ultrasonic cleaner.
6.
Check the rotor for magnetization. If a rotor has been left on a flowmeter, which is out of
service, or in flows without enough kinetic energy to spin the rotor, the blade nearest the
magnetic pickup will become over-magnetized. As a result, the rotor spins unevenly or
does not spin at all. To demagnetize a rotor, return the rotor to Spirax Sarco, for service.
7.
Contact your sales representative.
9.3 Analog output equals 0 mA
1.
Verify wiring is in accordance with the power and wiring diagrams in Section 4 'Electrical
installation'.
2.
Check the power supply voltage.
3.
Check the voltage at the flowmeter.
4.
Contact your sales representative.
Содержание RIM10 Series
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