Industrial Scientific TMX412 Instruction Manual

P/N 1705-0816
REV 10 Printed 1000-5000
Specifications Subject to Change

1001 Oakdale Road, Oakdale, PA 15071-1500
[phone] Toll Free 1-800-DETECTS
FAX [phone]

Multi-Gas Monitor

TMX 412

Instruction
Manual

GUARANTEED.

FOR LIFE.

OUR MISSION

Design - Manufacture - Sell:

Highest quality products

for the preservation of

life and property.

Provide:

Best customer service

available.

Dear Valued Customer:

Thank you for buying and using Industrial Scientific’s
Model TMX412 Multi-Gas Monitor.

Your TMX412 can be relied upon for dependable service,
day after day. It has been designed, manufactured, tested
and proven under the most scrutinizing conditions
possible. With the minimal care and maintenance
described in this Instruction Manual, it will provide you
with years of reliable monitoring.

I am most concerned that you be pleased with the
performance of your TMX412 in the months and years
ahead. I urge you to call us with any questions or
comments you may have. Often times a phone call and a
question can save you hours of frustration. Please never
hesitate to contact me at 1-800-DETECTS (338-3287).

All of us at Industrial Scientific appreciate the opportunity
to serve you.

Yours very truly,

Kent D. McElhattan
President & CEO
Industrial Scientific Corporation

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1.

W

ARNINGS ANDCAUTIONARYSTATEMENTS

Failure to observe certain procedures or conditions
may impair the performance of the instrument. For
maximum safety and performance while using the
instrument, please read and understand the procedures
and conditions outlined below.

Oxygen deficient atmospheres may cause readings of

combustible gas lower than actual concentrations.

Oxygen enriched atmospheres may cause readings of

combustible gas higher than actual concentrations.

Verify calibration of the combustible gas sensor after
use where the combustible gas content causes the
instrument to latch in the OVER-RANGE alarm condition.

Silicone compound vapors may cause desensitization
of the combustible gas sensor and may cause readings of
combustible gas to be lower than actual gas
concentrations. If the instrument has been used in an area
where silicone vapors were previously present, always
verify the instrument’s calibration before next use to
ensure accurate measurements.

Sensor aperture areas and water barriers must be kept
clean. Obstruction of the sensor aperture areas and/or
contamination of the water barriers may cause readings to
be lower than actual gas concentrations.

Sudden changes in atmospheric pressure may cause
temporary fluctuations in the oxygen reading.

Recharge battery only in a non-hazardous location.

Use the RS-232 port only in a non-hazardous location.

Instrument is tested for intrinsic safety in explosive
gas/air (21% oxygen) mixtures only.

CAUTION: High Over-Range (+OR) combustible

gas readings may indicate an
explosive concentration of
combustible gas.

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Multi-Gas

Monitor

TMX412

1. W

ARNINGS ANDCAUTIONARYSTATEMENTS

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2. U

NPACKINGTHEINSTRUMENT

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3. TMX412 F

EATURES

4

4. I

NSTRUMENTOPERATION

8

4

.1 Charging the Battery

8

4

.2

Turning the TMX412 On and Off 9

4.3 Display Backlight 9

4.4 TMX412 Operating Modes 9

4.4.1 Reading 9

4.4.2 Sensor Configuration 9

4.4.3 Zero 10

4.4.3 Peak 10

4.4.4 Peak Clear 10

4.4.6 Date 10

4.4.7 Cal Date 10

4.4.8 Log Time 10

4.4.9 TWA 10

4.4.10 STEL 10

4.4.11 Hygiene Reset 10

4.5 TMX412 Alarm Indicators 11

4.5.1 Low Alarm 11

4.5.2 High Alarm 11

4.5.3 Over-Range Indication 11

4.5.4 Combustible Gas Over-Range 11

4.5.5 Low Battery Warning 12

4.5.6 Battery Failure 12

4.5.7 Fault Indication 12

5. C

ALIBRATING THE

TMX412 12

6. C

HANGINGINSTRUMENTSETTINGS

15

6

.1 Setspan

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6.2

Alarms

16

6.3 Battery 17

6.4 Code 18

7. H

YGIENEFUNCTIONS

18

7.

1 Definition of Terms 18

7.1.1 Data Log 18

7.1.2 Period 18

7.1.3 Logging Session 18

7.1.4 Real Time Clock 18

7.1.5 Log Time Clock 18

7.1.6 Calendar 19

7.1.7 TWA 19

7.1.8 STEL 19

7.2 Principles of Operation 19

7.3 Resetting the Hygiene Functions 19

8. MAINTENANCE 20

8.1 Cleaning 20

8.2 Changing the Battery 20

8.3 Opening the Instrument for Service 21

8.4 Replacing Water Barriers 21

8.5 Installing or Changing Sensors 21

8.5.1 Toxic Sensor Removal 22

8.5.2 Combustible Sensor Removal 22

8.5.3 Oxygen Sensor Removal 22

8.6 Instrument Reassembly After Service 23

9. R

EPLACEMENTPARTS

26

10. S

PECIFICATIONS

27

11. D

EFAULTALARMSETTINGS

28

12. TMX412 O

PTIONS

& O

RDERINGINFORMA TION

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13. W

ARRANTY

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TABLE OF CONTENTS

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5

• The TMX412 automatically recognizes and displays the
sensor configuration when switched on.

• One-Button microprocessor controlled calibration.

• Illuminated display for viewing in low light conditions.

• Round-the-clock monitoring capability using the
interchangeable nickel-cadmium rechargeable,
disposable lithium, or disposable alkaline battery packs.

• Plug-in sensors that can be changed or replaced without
special tools or soldering equipment.

• Audible and visual alarm indicators.

• Optional external audible or vibrating alarms.

• High and low alarms for combustible and toxic gases;
enrichment and depletion alarms for oxygen.

• User selectable access code for security of calibration
and alarm settings.

• Combustible gas OVER-RANGE protection.

• PEAK reading mode.

• Press and hold power switch to prevent accidental turn
on or turn off.

• Hygiene/Data Log option that can be installed by the
factory or the customer, to provide short term exposure
limit (STEL) and time-weighted average (TWA)
readings with data logging.

• The TMX412 is classified as intrinsically safe by the
following agencies:

- Underwriters laboratories (UL).

- Canadian Standards Association (CSA). Canadian

Standards Association has assessed only the
combustible gas portion of this instrument for
performance.

- Mine Safety and Health Administration (MSHA).

- Workcov er Authority, NSW, Australia.

- Department of Mineral Resource, NSW, Australia.

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2.

U

NPACKING THEINSTRUMENT

The shipping box should contain the following items.
Account for each item before discarding the box.

QUANTITY PART NUMBER DESCRIPTION

1 1810-2183 TMX412 Multi-Gas Monitor

or 1 1810-2434 TMX412 Multi-Gas Monitor

(Australian Version)

1 1705-0816 TMX412 Instruction Manual
1 1705-0745 Keypad Overlay
1 1810-1824 Leather Carrying Case
1 1705-2946 Maintenance Tool

or 1 1705-0278 Maintenance Tool

(Australian Version)

1 1704-2839 Calibration Cup
1 1704-4157 Teflon Lined Tygon Tubing

After unpacking, if any listed item is missing, contact
either your local distributor of Industrial Scientific products,
or call Industrial Scientific Corporation at 1-800-DETECTS
(338-3287) in the United States and Canada, or
412-788-4353.

3.

TMX412 F

EATURES

The Industrial Scientific TMX412 Multi-Gas Monitor may
be configured to continuously monitor one, two, three or
four gases in any combination of the following:

• Oxygen

• Combustible gases (%LEL) or methane (% by volume
CH

4

). User selects %LEL or %CH4prior to calibration.

• Any two of the following toxic gases:

Carbon Monoxide
Hydrogen Sulfide
Sulfur Dioxide
Chlorine
Nitrogen Dioxide
Chlorine Dioxide