Post on 05-Sep-2018
Replacement Instructions For GEMS 3100 Transducer In
A Metron Eledyne FD4e Control Panel
To a DWYER 628 type.
Tools required: 22mm and 25mm Open end spanner, Teflon Thread
Tape
Transducer to replace: Look at the Gems part # on the existing
transducer to determine which model was used. It will either be
3100B300PG0290000F (300 PSI) or 3100B600PG0290000F (600 PSI)
Instructions: Isolate the controller by firstly turning off the AC isolator,
then the DC by using CB2 & CB3. Close valve to controller pressure
sensing line. Bleed off all water pressure in controller pressure sensing
line. Completely remove the GEMS cable from the old pressure
transducer, and disconnect from the motherboard.
Use the 22mm spanner wrench on the pressure transducer and the
25mm spanner on the brass coupling to remove the old pressure
transducer. Remove any excess thread tape from the brass tee.
Prepare the new DWYER pressure transducer with thread tape (put on
at least 4 layers). Install the new pressure transducer using the 22mm
and 25mm spanners as mentioned above. Be sure not to cross thread
the new pressure transducer in the brass fitting. Tighten firmly.
Thread the cable through the cable gland as shown.
Connect the new cable to the motherboard as shown above.
Red= PWR Supply (+) Black =AIN01 (+) Screen = AIN01 (-)
Put the controller in manual mode, then turn the controller on by firstly
closing the DC circuit breakers, CB2 & CB3, then turn on the AC isolator.
Reopen valve to controller pressure sensing line. Check for leaks. If any
leaks are present try tightening the transducer in the brass tee. If that
doesn't work start over and try more thread tape.
Verify that the pressure is reading correctly and then turn the controller
to automatic mode.