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.