Bacharach HGM-SZ Supplementary Manual - page 2
GAIN SET FAULT (CODE 200)
HGMSZ (3015-4200)
Gain set fault occurs when the Digipot setting is outside of acceptable limits.
For the AGMSZ (3015-4280) Ammonia single zone monitor the Digipot may be as low as 20.
To increase the emitter power, go to the screen shown below by putting the curser on “IR”
The bench resistance can also be measured across the two outside pins located on the connector
on the right side of the bench.
DIGIPOT
MODEL
P CAL
IR
Press the Enter key. The following screen will appear –
V=
mA=
R=
mW=
V should be 5.000 to 6.500 volts
MA should be 100 to 125
R should be 75 +/- 5 ohms (higher resistance readings could indicate the beginning of emitter
failure)
MW should be between 300 and 400
Asterisks (****) in any reading could indicate an A to D failure in the main PC board.
An asterisk in the resistance reading indicates an open IR emitter.
To readjust the MW to 300, locate R-37
R-37
Observe the MW reading as you adjust R-37 until it reads at least 700MW.Once that is adjusted,
return to the Digipot adjustment and reset the voltage to 4.245 volts.
Revised 6/5/08
P. M. Pape