Bacharach 3015-4492 User manual

Scope
These instructions describe how to replace the IR bench in the AGMSZ Ammonia Gas Monitor Single Zone
shown in Figure 1.
It is assumed that the user is familiar with the operation of the AGMSZ. If necessary, refer to Instruction
3015-4286 for detailed operation and maintenance information.
Items Required:
•Replacement IR Optical Bench Kit 3015-4492:
oIR Bench Assembly 3015-4282
oCable Ties (Qty. 2) 3015-2835
oInstruction Sheet 3015-4719
•Medium Phillips Head Screwdriver
•Small Flat Blade Screwdriver
•Wire Cutter (for removing cable ties)
Figure 1. AGMSZ
Ammonia Gas Monitor Single Zone
A
GMSZ IR Bench
Replacement Kit 3015-4492
Instruction 3015-4719
Rev. 0 – February 2006

Instruction 3015-4719
2
Removing the IR Bench
1. Find the AGMSZ and switch OFF its AC circuit breaker. Observe that the monitor’s front panel green
MONITOR ON indicator should be OFF.
2. Use a Phillips screwdriver to remove the monitor’s two door screws, and then open the door.
3. Take time to familiarize yourself with the internal components of the AGMSZ shown in Figure 2.
4. Refer to Figure 2 and perform the following to remove the old IR bench:
a. Pull the 10-pin and 12-pin electrical connectors from their sockets on the IR bench. Note that
these connectors may have been secured in place for shipping purposes with either hot-glue or
cable ties. As necessary, either pry the hot-glue from each connector, or cut off the cable ties.
b. Pull the tubing from the gas-inlet and gas-outlet fittings on the IR bench.
c. Using wire cutters, cut the two cable ties that secure the IR bench to the enclosure, and then
remove the bench.
Installing the New IR Bench
5. Perform the following to install the new IR bench:
a. Remove protective caps from the gas-inlet and gas-outlet fittings on the new IR bench.
b. Position the new bench inside the AGMSZ enclosure so that the end with the 12-pin electrical
connector (IR Source) is located on the right, and that the gas fittings are facing upwards.
c. Using the two cable ties supplied in the kit, secure the bench to the cable-tie mounts on the side
wall of the enclosure. Cut off any cable-tie excess.
d. Connect tubing from pump to the IR bench gas-outlet fitting, and connect tubing from purge
valve V1 to the IR bench gas-inlet fitting.
e. Plug the 12-conductor ribbon cable from IR SOURCE connector J5 on the main board into the
12-pin IR bench connector.
f. Plug the 10-conductor ribbon cable from DET connector J6 on the main board into the 10-pin
IR bench connector.
Figure 2. AGMSZ Components
GAS INLET GAS OUTLET
PURGE
VALVE V1
DET
CONNECTOR
J6 IR SOURCE
CONNECTOR
J5
10-PIN
CONNECTOR
(Detector)
12-PIN
CONNECTOR
(IR Source)
CABLE TIE
(2 Places)
IR BENCH
PUMP
CABLE TIE MOUNT
(2 Places)
IR SET R37

Instruction 3015-4719 3
6. Check to ensure that the new IR bench is properly secured, and that all tubing and electrical
connectors are tight.
7. Turn ON the AGMSZ’s AC circuit breaker.
8. Allow the monitor to warm-up for at least ½ hour before proceeding.
Adjusting the IR Bench Voltage
9. Enter the monitor’s set-up mode and display the IR bench voltage adjustment screen as follows:
a. With the monitor in its MEASURE mode, use the Keypad buttons
to place the arrow (>) on the display next to the CAL function.
b. Press the Right-Arrow and ENTER buttons at the same time to
display the revision screen.
c. Press the QUIT button to display the set-up screen.
d. With the arrow (>) next to the DIGIPOT function, press the
ENTER button to display the IR bench voltage adjustment screen.
10. While observing the IR VOLT reading, use the Up- and Down-Arrow
buttons to obtain a reading of 4.200 ±0.100 volts. Note that the DIGIPOT
value may vary from what is shown in the display on the right.
If the voltage is too high and cannot be adjusted down to 4.2 volts as
described above, then perform Step 11; otherwise, skip to Step 12.
11. Perform the following only if the IR bench voltage cannot be adjusted to within the desired voltage
range as described in Step 10:
a. While observing the DIGIPOT reading, use the Up- and Down-Arrow buttons to obtain a
reading of 220.
b. While observing the IR VOLT reading, use a small blade screwdriver to adjust IR SET
potentiometer R37 (see Figure 2) for a reading of 4.200 ±0.100 volts.
12. Press the ENTER button, and then press the QUIT button twice to exit the monitor’s set-up mode.
13. Upon exiting the set-up mode a purge cycle will be performed; after which, the monitor will
automatically return to its MEASURE mode.
14. Close and secure the enclosure door using the screws removed in Step 2.
15. The monitor can now be placed back into service.
SILENCE ZONETMP
SQUELCH >CAL
R
EV
M
D Y
x.xx at HH:MM:SS
>DIGIPOT MODEL
P CAL IR
DIGIPOT=19
3
IR VOLT=4.200

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