Bacharach AGM300 Manuel utilisateur

These instructions describe how to replace the IR Optical Bench in the AGM300 Ammonia Gas Monitor.

It is assumed that the user is familiar with the operation of the AGM300 / ADM800 Ammonia Gas

Monitoring System. If necessary, refer to Instruction 3015-4275 for detailed operation and maintenance

information.

Items Required:

•Replacement IR Optical Bench Kit 3015-4521:

oIR Bench Assembly 3015-4204

oWire Ties (Qty. 2) 3015-2835

oInstruction Sheet 3015-4723

•Medium Phillips Head Screwdriver

•Small Flat Blade Screwdriver

•Wire Cutter (for removing wire ties)

Removing the IR Optical Bench

1. Find the AGM300 Ammonia Gas Monitor and switch OFF its AC

circuit breaker. Observe that the monitor’s green MONITOR ON

indicator light on the front panel should be OFF.

2. Use a Phillips screwdriver to loosen the monitor’s two door latches,

and then open the door.

3. Take a few minutes to familiarize yourself with the internal

components of the AGM300 shown in Figure 2.

GM300 Optical Bench

Replacement Kit 3015-4521

Instruction 3015-4723

Rev. 0 – February 2006

Figure 1. AGM300

Ammonia Gas Monitor

Upper Gas Sample Tube

Upper Electrical Connector (Red)

Upper Wire Tie

Main Board

Lower Wire Tie

AC Power Switch

Lower Electrical Connector

Lower Gas Sample Tube

Figure 2. AGM300 Components

Instruction 3015-4723

4. IMPORTANT! For added safety, turn OFF the AGM300 by pushing

the internal AC Power Switch to its DOWN position! This step is in

addition to setting the monitor’s AC circuit breaker to OFF.

Recheck the front panel MONITOR ON indicator light to ensure

that it is OFF. With AC power removed, it is now safe to work

inside the enclosure.

5. Refer to Figure 2 and perform the following:

a. Pull the upper and lower electrical connectors from their sockets

on the Main board. Please note that the upper ribbon cable is the

shorter of the two cables and has a red connector.

b. Pull the upper and lower gas sample tubes from their fittings on

the IR Optical Bench.

c. Using wire cutters, cut the upper and lower wire ties that hold

the IR Optical Bench in place, and then remove the bench.

d. Please provide the serial number of the AGM300 and return the

old IR Optical Bench to:

Bacharach Inc.

621 Hunt Valley Circle

New Kensington, PA 15068

Attn: Repair Department

Installing the New IR Optical Bench

6. Perform the following:

a. Position the new IR Optical Bench inside the AGM300 enclosure

so that the end with the shorter ribbon cable and red connector

is located at the top, and the gas fittings are facing forward.

b. Using the wire ties supplied in the kit, secure the bench to the

tie-down fixtures on the back panel of the enclosure.

c. Plug the ribbon cables from the new bench into their associated

sockets on the Main board. Note location of red connector

d. Connect the gas sample tubes to their associated fittings on the

new bench.

7. Check to ensure that the new IR Optical Bench is properly secured,

and that all tubing and electrical connectors are tight.

8. Turn ON the AGM300’s AC circuit breaker, and push the monitor’s

internal AC Power Switch to its UP (or ON) position.

WARNING! Shock hazard. The monitor is now powered ON.

9. Before proceeding, allow the AGM300 to warm-up until its green

MONITOR ON indicator light stops flashing.

Figure 3. AC Power

ON/OFF Switch

Figure 4. IR Optical

Bench Installation

RED Connector

Instruction 3015-4723 3

Adjusting the IR Optical Bench Detector Voltage

10. Check, and possibly adjust, the IR Optical Bench detector voltage

by first going to the ADM800 and pushing the button on the System

Screen that corresponds to the AGM300 monitor being serviced.

This action will display that monitor’s SETUP Screen.

11. From the SETUP Screen, press the DIAG button to display the

DIAGNOSTIC Screen of the monitor being serviced.

12. Look at the second line labeled DET. This is the IR Optical Bench

detector voltage. The voltage should be between 4.2 and 4.3 VDC.

If the voltage is out of range, then go to Step 13.

If the voltage is within range, then skip to Step 14.

Figure 5. Push button of

monitor being serviced to

display its SETUP Screen

Figure 6. Push DIAG button

to display DIAGNOSTIC Screen

Figure 7. Detector voltage

should be between

4.2 and 4.3 VDC

Instruction 3015-4723

13. Go back to the AGM300 and find GAIN ADJ potentiometer R34 on

the Main board. Using a small flat-blade screwdriver, turn R34

clockwise to increase, or counterclockwise to decrease, the detector

voltage to between 4.2 and 4.3 VDC. MAKE VERY SMALL

ADJUSTMENTS!

14. Secure the AGM300’s enclosure door and place the monitor back

into service.

Headquarters:

621 Hunt Valley Circle, New Kensington, PA 15068

Ph: 724-334-5000 • Fax: 724-334-5001 • Toll Free: 1-800-736-4666

Website: www.bacharach-inc.com • E-mail: [email protected]

Printed in U.S.A. ® Re

istered Trademark of Bacharach Inc.

Figure 8. Detector GAIN

ADJ Potentiometer R34

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