Liquid Controls MA4 Meter - Manual (Page 13)

13
Pulse Output Device (POD5)
Service Information
Due to the simplicity of the POD5, there are few things
that can go wrong with the device. However, as with all
electronic devices, failures can occur making it necessary
to replace failed part(s). There are only three functional
spare parts for the POD5; the hub/magnet assembly-
North Poles, hub/magnet assembly-South Poles, and the
encoder assembly. The South Pole hub/magnet
assembly operates inside the flowmeter and, therefore,
is exposed to and is wetted by the process fluid. Due to
its materials of construction, this assembly is unlikely to
fail. In the event that it does fail, the POD5 has to be
removed from the meter front cover to access the driver/
lower magnet assembly.
Remove the POD5 from the meter by removing the two
hex head mounting screws and pulling out the POD5.
Remove the two allen head set screws using a 1/16 hex
driver and pull on the driver tang to extract the driver/
lower magnet assembly. Disassemble the hub/magnet
assembly from the drive shaft and attach the new hub/
magnet assembly in its place. Reassemble the unit.
It is more likely that if a failure of the POD5 occurs, it can
be repaired by replacing the encoder assembly. Simply
turn off the power to the unit, open the cover, disconnect
the electrical connector, loosen the mounting screws and
pull the encoder assembly out. Remove the hub/magnet
assembly from the old encoder shaft. Reassemble the
new encoder assembly.
Caution: It is important to use the correct hub/magnet
assemblies to maintain the magnetic couple. Use of two
North Pole or two South Pole assemblies will not allow
the driver to function properly.
Encoder Schematic