Bacharach HGM-SZ Manual
NEW STYLE HGMSZ TECHNICAL SUPPORT NOTES
FOR ALL SERIAL NUMBER STARTING WITH NU XXX AND ABOVE (JULY 2008)
<4000> Zero Fault – IR Voltage out of tolerance
<4200> Zero Fault and Gain set Fault
<8000> Clipping Fault – Detector voltage out of tolerance
For both Zero Fault and Clipping Fault – Press the UP arrow key to locate the screen displaying
the following-
SILENCE ZONE TMP
SQUELCH CAL
Place curser on CAL – press right arrow key and ENTER at the same time.
The new screen will show the revision number. Note the revision number. Press the
SILENCE/QUIT key: the next screen will display the following –
DIGIPOT MODEL
P CAL IR
Place the curser on DIGIPOT – Press the ENTER key. The following screen will appear –
NOTE – To verify correct model number, put curser on model and press enter. Standard
refrigerant – 3015-4200, ammonia – 3015-4280.
DIGIPOT = XXX
IR VOLT = X.XXX
Adjust the IR reading using the up and down arrow until the IR VOLT = 4.245 volts or as close
as you can get it to that reading. Press SILENCE/QUIT key until you return to the screen reading
PURGE.
NOTE – The fault may not clear if the Digipot voltage is more then 0.15 volts away from 4.2
volts.
Revised 6/5/08
P. M. Pape
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
RESET TO DEFAULT SETTINGS
Press and hold the DEFAULT button (located about one inch above the 4-20mA dc output
connector), cycle power holding the DEFAULT button in. A single long “beep” will be heard. –
release the button after the “beep” stops. The screen will display PURGE. The next screen will
show the DIGIPOT adjusting the IR VOLTAGE to default settings. The monitor will then go
into normal warm-up.
TO CLEAR ALL FAULT CODES
From the measure screen – press the right arrow key and enter key at the same time. A single
long “beep” will be heard and all previous fault codes will clear.
TO CONVERT FAULT CODES FROM NUMERIC TO ENGLISH
From the fault screen press enter. Use the up and down arrow keys to scroll through the fault list.
Those items in fault will have the English translation on the bottom right side of the screen.
IR BENCH RESISTANCE READING
To verify the IR bench resistance place the curser on IR in the DIGIPOT screen and press the
ENTER key. R is the IR bench resistance reading. The reading should be about 50 ohms.
V-X.XXX mA-XXX.X
R-XX.X mW-XXX.X
4 TO 20 Ma dc OUTPUT TEST
Remove the jumper from the 4-20 output connector. Connect a multi-meter set for mA to the
contacts. The output should be a nominal 4 mA except for reading an actual gas concentration.
Scroll through the screens until the screen displaying LOOP is located: enter the LOOP function
by placing the curser on LOOP and pressing ENTER. The setting should be 0.016mA.
HGMSZ NOTES
To clear faults – From measure screen press right arrow and enter key at same time.
To read fault codes – From fault screen press enter. Use down arrow key to run through fault list.
Those items in fault will have the English translation on the bottom right of screen.
If the monitor will not retain its settings through a power cycle, verify that the battery is properly
installed.
Revised 6/5/08
P. M. Pape
PRESSURE READINGS FOR THE HGMSZ
Codes 800, 1000 and 1800
FIRST DIAGNOSTIC SCREEN
Zone Pressure (0.06 psi below ambient) Maximum
2.7 PSIA
4.26500V <0000>
24.5Cd 14.00psi
Press left arrow key
Revised 6/5/08
P. M. Pape
Purge Pressure (0.03 psi below ambient) Maximum
2.7 PSIA
4.26500v <0000>
24.5cD* 14.3psi
Look for asterisk
Press left arrow key until asterisk clears. Then press bottom arrow key. This will stop the pump.
Take the pressure reading with the pump off then press the bottom arrow key to restart the pump.
DO NOT LEAVE THE PUMP OFF FOR A LONG PERIOD OF TIME.
Ambient Pressure (pump off)
4.26500v <0000>
24.5cD 14.50psi
Locate the screen the shows as below.
Place the curser on P-CK and press ENTER.
P-CK CUST K2
CUST K1 CUST K3
The next screen shows as below. Place your finger over the intake of the charcoal filter. The
DIF reading should go to 2.00 or greater.
13.11 * AMB 14.42
1.21 DIF <0000> If this does not occur then the pump is defective.
Note: Asterisks (****) in V, MA and MW indicate an A to D failure on the main PC board.
Note – Left arrow toggles valve. * equals purge pressure. No * equals zone pressure.
Revised 6/5/08
P. M. Pape
WHOM TO CALL AT THE FACTORY FOR REFRIGERANT
GAS LEAK MONITOR ASSISTANCE
PHONE NUMBER: 800-888-6400 X 2478
FAX NUMBER: 678-423-2479
E-MAIL:
SHIPPING ADDRESS:
BACHARACH, INC.
621 HUNT VALLEY CIRCLE
NEW KENSINGTON, PA 15068
WARRANTY HIGHLIGHTS
¾PLEASE REVIEW COMPLETE WARRANTY CONDITIONS.
¾PARTS: 2 YEARS AFTER SHIPMENT FROM FACTORY UNLESS OTHERWISE
NEGOTIATED.
¾LABOR: 90 DAYS AFTER SHIPMENT.
¾DRILLING INTO THE TOP OF THE HGM300 OR RDM800 CASE VOIDS
WARRANTY.
¾ANY WATER FOUND IN THE INFRARED DETECTING BENCH VOIDS
WARRANTY.
¾ANY OBVIOUS DAMAGE VOIDS WARRANTY.
¾CALL ANYONE LISTED ABOVE FOR WARRANTY QUESTIONS OR CLAIMS.
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