Bacharach DIOXOR II, MONOXOR II, 0019-7038, NONOXOR II, MONOXOR II H Combined Service Manual

INSTRUCTION 0019-9166

COMBINED SERVICE MANUAL for:

DIOXOR

®

II

MONOXOR® II

MONOXOR® II H (High Range)

NONOXOR® II

Rev. 7 – May 2010

621 Hunt Valley Circle, New Kensington, PA 15068

Phone: [phone] • Fax: [phone] • Web: www.mybacharach.com

Printed in the U,S.A.

Bacharach, Inc.

® Bacharach, Dioxor, Monoxor, and Nonoxor are registered trademarks of Bacharach, Inc.
Copyright © Bacharach 1997-2010, all rights reserved.

A

TABLE OF CONTENTS

1.0 SERVICE MANUAL CONTENTS.................................................................4

2.0 MAINTENANCE ............................................................................................5

2.1 Opening the Case..................................................................................5

2.2 Closing the Case....................................................................................6

2.3 Cleaning........................................................................................7

2.4 Sensor Replacement..............................................................................9

2.5 Printed Circuit Board Replacement.....................................................10

2.6 Chamber Assembly Servicing..............................................................11

3.0 SENSOR CALIBRATION............................................................................12

3.1 Monoxer II CO Calibration.................................................................12

3.2 Dioxor II SO2, Monoxor II H CO, and Nonoxor II NOx Calibration...13

4.0 TROUBLESHOOTING CHART ................................................................14

5.0 REPLACEMENT PARTS.............................................................................17

5.1 Probe Assembly .................................................................................17

5.2 Instrument Assembly ..........................................................................18

5.3 Miscellaneous Parts and Accessories.................................................20

5.4 BACHARACH Sales/Service Centers...............................................20

Single Gas Instrument Service Manual

1.0 SERVICE MANUAL CONTENTS

This manual contains the following service information for the . . .

DIOXOR II (Part No. 0019-7038 & 0019-7043)

MONOXOR II (Part No. 0019-7034 & 0019-7039)

MONOXOR II H (Part No. 0019-8015)

NONOXOR II (Part No. 0019-7036 & 0019-7042).

NOTE: The 0019-7039, 0019-7042, and 0019-7043 versions of these
instruments do not contain a probe, all non-probe related functions
remain the same in this instruction.

• Instrument maintenance, which includes information on how to:

• Open and close the case

• Clean the Fan Assembly and chamber assembly area

• Replace the sensor

• Replace the Printed Circuit Board (P.C.B.)

• Service the gas-sensing chamber assembly (chamber assembly)

• Sensor calibration

• Troubleshooting chart

• Replacement parts list

GENERAL NOTE

If excessive torque is applied to the instrument's
fasteners, poor performance or damage to components
may occur.

The torque specifi cations are as follows:

Screws Torque

Sensor Mounting 4 - 8 oz. in.
Motor Mounting 6-10 oz. in.
Chamber Sealing 16-20 oz. in.
Rear Cover/Case 18-24 oz. in.
Fan Assembly 32-40 oz. in.

Page 4 Bacharach, Inc. Instruction 0019-9166

2.0 MAINTENANCE

2.1 Opening the Case

Equipment Needed:

• Phillips-head screwdriver, No. 1

Procedure:

1. Lay the instrument face down on a workbench; then detach the metal clip
from the bottom of case and fold the elastic strap over top of the instrument
(Fig 2-1).

2. Slide off battery cover.

3. Remove batteries.

4. Using a No. 1 Phillips-head screwdriver, remove the two screws from the
rear of the case.

Single Gas Instrument Service Manual

Figure 2-1.

Opening and
Closing the Case

5. Lift up the bottom portion of the rear case and slide it forward until the case
clears the inlet port.

6. To gain better access to the components, remove the gas-sensing chamber as­sembly (Chamber Assembly) and the Printed Circuit Board (P.C.B.) from the
front case by pulling them straight up from the front case (Fig 2 -2); then lay
these items on your workbench.

Instruction 0019-9166 Bacharach, Inc. Page 5

Single Gas Instrument Service Manual

2.2 Closing the Case

Equipment Needed:

• Phillips-Head Screwdriver, No. 1

Procedure:

When replacing the P.C.B. and chamber assembly, the P.C.B. must
be installed FIRST. The P.C.B. switches could be damaged if the
P.C.B. is installed after the chamber assembly is in place.

1. Ensure that the P.C.B. is properly positioned face down over its locating-tab
on the front case (Fig 2-2).

2. Properly position the chamber assembly between the ribs of the front case.

CAUTION

Figure 2-2.

P.C.B. and
Chamber Assem­bly
Removal and
Installation

3. Slide the rear case over the inlet port and properly join the two case halves
together.

4. Secure the case halves to each other using the two screws removed in Sec­tion 2.1, Step 4 (Tighten to 18–24 oz. in.).

5. Reinstall the batteries (observe proper battery polarity); replace the battery
cover; and attach the elastic strap’s metal clip to the bottom of the instru­ment.

Page 6 Bacharach, Inc. Instruction 0019-9166