Assembly; Pickup Coil Testing - Hoffer Flow Controls MF SERIES User Manual

4.4

Assembly

1. Install any new parts.
2. Guide the rotor and bearing assembly onto the shaft. Make
sure the rotor is installed with the cup side of the Pelton wheel
facing the "IN" side of the housing.
3. Place a new gasket on the insert. Always use a new gasket.
4. Place the shaft assembly insert, gasket, and rotor assembly
back into housing by inverting the housing to keep gasket and
rotor assembly in place.
5. Install the threaded plug and tighten to 50 ft-lb.
4.5

Pickup Coil Testing

Testing the MAG and MCP (RF) coils consists of measuring the
resistance with an ohmmeter. Resistance measurements are to be
made when there is no flow through the meter or with the coil
removed from the meter housing.
1. Measure the resistance between pin A and pin B. The
resistance should be approximately as listed in the following
table of some common coils.
2. The resistance from any pin to the case should be greater than
1 Mohm.

For specific coils not listed contact the HFC Customer Service Department for the
approximate resistance readings.

COIL
MC2PAHT
MCP3A
PC13-74G
PC13-74S
PC24-45G
PC24-45S
PC28-13G
PC28-14G
Maintenance
DC RESISTANCE
(Ohms)
15.0 10%
11.5 10%
1800 10%
1850 15%
1350 10%
1850 15%
120 20%
180 20%
15
HP-210