Heath Consultants GT Series User Manual

User Handbook

USER HANDBOOK

Issue 2

30/05/06

Part Number: 67112

GMI welcomes comments on all our publications. Your comments can be of great value in helping us to improve our customer publications. Please send any comments that you have to our Sales Department at GMI. Contact details are provided inside the back cover of this handbook.

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Gas Measurement Instruments Ltd 2005

COPYRIGHT

This User Handbook is copyright of Gas Measurement Instruments Ltd (GMI) and the information contained within, is for use only with GT series instruments. Reproduction, in whole or in part, including utilisation in machines capable of reproduction or retrieval without written permission of Gas Measurement Instruments Ltd is prohibited. Reverse engineering is not permitted.

LIABILITY

Every care has been taken in the preparation of this document, but GMI Ltd do not accept any responsibility for errors or omissions and their consequences. Information in this document is subject to change without notice. This document does not constitute a specification or basis for a contract. Your statutory rights under law are not affected.

MODIFICATION NOTICES

GMI aim to notify customers of relevant changes in the product operation and maintain this manual up to date. In view of the policy of continuous product improvement there may be operational differences between the latest product and this manual.

This Handbook is an important part of the GT series product. Please note the following points:

 It should be kept with the instrument for the life of the product.

 Amendments should be attached.

 This Handbook should be passed on to any subsequent owner/user of the

instrument.

 Although every care is taken in the preparation of this Handbook it does not

constitute a specification for the instrument.

SOFTWARE

Software supplied on EPROM or similar device for use in a particular product, may only be used in that product and may not be copied without the written permission of Gas Measurement Instruments Ltd. Reproduction or disassembly of such embodied programmes or algorithms is prohibited. Ownership of such software is not transferable and GMI Ltd does not warrant that the operation of the software will be error free or that the software will meet the customers requirements.

DISPOSAL ADVICE

When no longer in use, dispose of the instrument carefully and with respect for the environment. GMI will dispose of the instrument without charge if returned to the factory.

USER HANDBOOK

SAFETY

 The instrument must be regularly serviced and calibrated by fully trained

personnel in a safe area.

 Batteries: Alkaline or *Rechargeable batteries must be exchanged (*and

recharged) in a safe area and fitted correctly before use. Never use damaged batteries or expose to extreme heat. See Chapter 12 : OPERATOR MAINTENANCE.

 Only GMI replacement parts should be used.

 If the instrument detects gas, follow your own organisations procedures

and operational guidelines.

 The combustion chamber is a flameproof assembly and must not be opened

in the presence of a flammable atmosphere.

 GT series instruments are certified as ATEX II 2 G EEx iad IIB T3

(-20oC < Tamb < 50oC). UL Class 1 Groups C and D.

 This equipment is designed and manufactured to protect against other

hazards as defined in paragraph 1.2.7 of Annex II of the ATEX Directive

94/9/EC Any right of claim relating to product liability or consequential damage to any third party against GMI is removed if the warnings are not observed.

WARNING: To prevent ignition of flammable or combustible atmospheres, remove batteries before servicing.

WARNING: To prevent ignition of flammable or combustible atmospheres, read, understand and adhere to the manufacturers live maintenance procedures.

WARNING: To reduce the risk of ignition of a flammable or explosive atmosphere, batteries must be changed only in a location known to be non-hazardous.

WARNING: To reduce the risk of explosion, do not mix old batteries with used batteries or mix batteries from different manufacturers.

WARNING: Never attempt to recharge non rechargeable cells.

CAUTION: Not for use in oxygen enriched atmospheres.

CAUTION: Replace batteries only with approved batteries:

NiMH  GP350

Alkaline  Duracell, Energizer, Rayovac.

AREAS OF USE

Exposure to certain chemicals can result in a loss of sensitivity of the flammable sensor. Where such environments are known or suspected it is recommended that more frequent response checks are carried out. The chemical compounds that can cause loss of sensitivity include Silicones, Lead, Halogens and Sulphur. Do not use instrument in potentially hazardous atmospheres containing greater than 21% Oxygen. The enclosure material is polypropylene and must not be exposed to environments which are liable to result in mechanical or thermal degradation or to damage caused by contact with aggressive substances. Additional protection may be required in environments where the instrument enclosure is liable to damage.

STORAGE, HANDLING AND TRANSIT

Rechargeable batteries contain considerable energy and care should be taken in their handling and disposal. Batteries should be removed if the instrument is stored for longer than 3 months. The instrument is designed to handle harsh environments. The sensing elements are sealed to IP54 and the rest of the instrument to IP64. If not subject to misuse or malicious damage, the instrument will provide many years of reliable service. The instrument contains electrochemical sensors with a life of 2 years. Under conditions of prolonged storage the sensors should be removed. The sensor contains potentially corrosive liquid and care should be taken when handling or disposing of the sensor, particularly when a leak is suspected.

WARRANTY

The GT series instrument has a warranty against faulty goods or workmanship of 5 years. Consumable and Mechanical parts are not included in this. These are covered under GMI standard warranty conditions. For details, please contact GMI Ltd (UK).

iii

USER HANDBOOK

REVISION RECORD

Date Issue Description Of Change

07/09/2005 1 New Handbook

30/05/2006 2 To incorporate effect of

CR 4223, CR 4229, CR 4279 and various other instrument configuration updates.

USER HANDBOOK

CONTENTS

LIABILITY ....................................................................... i

MODIFICATION NOTICES ................................................ i

SOFTWARE ................................................................... i

DISPOSAL ADVICE ........................................................ i

SAFETY ......................................................................... ii

AREAS OF USE ............................................................ iii

STORAGE, HANDLING AND TRANSIT ......................... iii

WARRANTY ................................................................. iii

REVISION RECORD ....................................... v

INTRODUCTION .......................................... 1-1

1.1 INSTRUMENT RANGES .................................... 1-3

GENERAL FEATURES ............................... 2-1

2.2 MODES OF OPERATION ................................... 2-2

OPERATING PROCEDURE ........................ 3-1

3.1 SWITCH THE INSTRUMENT ON ........................ 3-2

3.2 INSTRUMENT IDENTIFICATION ......................... 3-3

vii

USER HANDBOOK

3.3 BATTERY STATUS ........................................... 3-3

3.4 TIME AND DATE ................................................ 3-4

3.5 CALIBRATION DUE DATE ................................. 3-4

3.6 SERVICE DUE DATE ....................................... 3-10

3.7 SWITCH THE INSTRUMENT OFF OR RE-ENTER

THE MODE MENU ................................................... 3-17

LEAK TEST MODE ..................................... 4-1

LEAK TEST RANGES .............................................. 4-1

4.2 LEAK TEST FEATURES .................................... 4-1

4.3 LEAK TEST DISPLAYS .....................................4-2

4.4 LEAK TEST BUTTON OPERATION ................... 4-6

4.5 DESCRIPTION OF LEAK TEST BUTTON OPERA-

TION ......................................................................... 4-7

4.6 LEAK TEST TICKER (GEIGER) FUNCTION ..... 4-11

4.7 LEAK TEST ALARMS ..................................... 4-12

4.8 LEAK TEST LOGGING .................................... 4-12

CONFINED SPACE MODE ......................... 5-1

5.1 CSM RANGES .................................................. 5-1

5.2 CSM FEATURES ............................................... 5-1

5.3 CSM DISPLAYS ................................................ 5-2

5.4 CSM BUTTON OPERATION .............................. 5-4

5.5 DESCRIPTION OF CSM BUTTON OPERATION .. 5-5

5.6 CSM PUMP ........................................................ 5-8

5.7 CSM ALARMS .................................................. 5-8

viii

CONTENTS

5.8 CSM LOGGING ................................................. 5-8

5.9 CSM CONFIDENCE SIGNAL ............................. 5-9

BARHOLE TESTING MODE ....................... 6-1

6.1 BARHOLE RANGES ......................................... 6-1

6.2 BARHOLE FEATURES ...................................... 6-1

6.3 BARHOLE DISPLAYS ....................................... 6-2

6.4 VIEW BARHOLE RESULTS .............................. 6-8

6.5 BARHOLE OPERATION .................................. 6-10

6.6 DESCRIPTION OF BARHOLE BUTTON OPERA-

TION ....................................................................... 6-10

6.7 BARHOLE ALARMS .......................................6-12

CO (CARBON MONOXIDE) MODE ............. 7-1

7.1 CO RANGES ..................................................... 7-1

7.2 CO FEATURES .................................................. 7-1

7.3 CO MENU ..........................................................7-2

7.4 CO DISPLAYS .................................................. 7- 3

7.5 CO BUTTON OPERATION .................................7-6

7.6 DESCRIPTION OF CO BUTTON OPERATION .... 7-6

7.7 CO ALARMS .....................................................7-8

7.8 CO LOGGING ................................................... 7-8

PURGE MODE ........................................... 8-1

8.1 PURGE RANGES .............................................. 8-1

USER HANDBOOK

8.2 PURGE FEATURES ........................................... 8-1

8.3 PURGE DISPLAYS ............................................8-2

8.4 PURGE BUTTON OPERATION .......................... 8-3

8.5 DESCRIPTION OF PURGE BUTTON OPERATION ..

................................................................................. 8- 4

8.6 PURGE ALARMS .............................................. 8-5

SNIFFER MODE ......................................... 9-1

9.1 SNIFFER RANGES ............................................ 9-1

9.2 SNIFFER FEATURES ......................................... 9-1

9.3 SNIFFER DISPLAYS ......................................... 9-1

9.4 SNIFFER BUTTON OPERATION ........................ 9-3

9.5 DESCRIPTION OF SNIFFER BUTTON OPERATION

................................................................................. 9- 3

9.6 SNIFFER TICKER (GEIGER) INDICATION .......... 9-6

PRESSURE MODE .................................. 10-1

10.1 PRESSURE RANGES ....................................10-1

10.2 PRESSURE FEATURES .................................10-1

10.3 PRESSURE DISPLAYS ................................ 10-2

10.4 PREPARE INSTRUMENT (PRESSURE MODE)1 0- 3

10.5 PRESSURE BUTTON OPERATION ................10-4

10.6 DESCRIPTION OF PRESSURE BUTTON OPERA-

TION ....................................................................... 10-4

10.7 PRESSURE ALARMS .................................... 10-5

CONTENTS

ALARMS .................................................... 11-1

11.1 GAS ALARMS .............................................. 11-1

11.2 FLAMMABLE (LEL) ALARMS ....................... 11-1

11.3 OXYGEN (O2) ALARMS ............................... 11-1

11.4 TOXIC GAS (e.g. CO) ALARMS ................... 11-1

11.5 ALARM TYPES ............................................. 11-9

11.6 FAULT ALARMS ......................................... 11-13

OPERATOR MAINTENANCE .................... 12-1

12.1 CLEANING .................................................... 12-1

12.2 FILTER REPLACEMENT................................ 12-1

12.2.1 Probe Filter ................................................ 12-2

12.2.2 Chemical Filter (Accessory) .................... 12-5

12.2.3 Cotton Filter (Accessory) ...................... 12-10

12.3 BATTERY REPLACEMENT ........................ 12-13

12.3.1 Remove and Replace Batteries ............. 12-15

12.3.2 Charging (Rechargeable) Batteries ....... 12-19

CALIBRATION ........................................... 13-1

13.1 CALIBRATION VALIDITY .............................. 13-2

ACCESSORIES ........................................ 14-1

USER HANDBOOK

ADDITIONAL INFORMATION ..................... 15-1

Training .................................................................... 15-1

World Wide Web ...................................................... 15-1

TYPICAL OPERATING PARAMETERS ....... A-1

Dimensions (excl. probe) ....................................... A-2

Weight (incl. probe & batteries) ............................. A -2

Temperature Limits ................................................. A- 2

Humidity .................................................................. A-2

Construction / Protection Rating ............................ A- 2

Display .................................................................... A-2

Sampling System.................................................... A-2

Power Source ........................................................ A-2

INDEX ............................................................. I

xii

INTRODUCTION

The GMI GT series instruments are designed to be multifunction, multi-application gas detectors to suit all the needs of a Gas Industry Service Technician.

Fig. 1.1 GT series Instrument

1-1

USER HANDBOOK

In the following procedure, the five instrument buttons shown in Fig 1.2 are referred to as detailed below:

Centre

Down

Fig. 1.2 Button References

Button Text Reference

LH (INVERT): LH button

Centre (RANGE): Centre button

RH (PUMP): RH button

Up: UP button

Down: DOWN button

1-2

INTRODUCTION

The bottom line of the instrument display may indicate button press options. For example, to select Yes from the following screen option, you would press the RH button. To select No, the LH button would be pressed.

Fig 1.3 Option Select

The principle of selecting any one of three options on the bottom line of the instrument display, by pressing either LH, CENTRE or RH buttons, is used throughout the operation of this instrument.

1.1 INSTRUMENT RANGES

The detection ranges, available but which may not all be included in the version of GT selected by your company, are:

 0-10,000 ppm Flammable (Sniffer Range)  0-100% LEL Flammable

(Option to display as %Gas)

 0-100% VOL Flammable  0-25% O

 0-2000 PPM CO  0-100 PPM H

 0 to 60 in. Water Gauge (0 to 150mBar)

1-3

USER HANDBOOK

1-4

GENERAL FEATURES

 An integral pump draws the required sample over

all of the sensors

 The pump flow is monitored by means of a pres-

sure transducer

 Datalogging is available for some applications

 A Bleep sounds for each button press

 A green LED indicates Power ON

To simplify use in its many applications, the instrument utilises a menu system similar to a (cell) mobile phone, as shown in Fig 2.1.

Fig. 2.1 Mode Menu

The bottom line of the LCD can also be used to indicate press and hold button functions available.

2-1

USER HANDBOOK

By simple selection of the application you need, the appropriate gas(es) are shown on the display and only the necessary button functions and alarms are activated.

Note: Your company may have decided to have its

instruments configured only for certain of the aforementioned applications.

2.2 MODES OF OPERATION

Leak Test

This mode is for the technician to investigate odour or leak complaints and to pinpoint the leak.

Refer to Chapter 4 for Leak Test mode operation.

Confined Space

Used for confined space pre-entry testing and for personal monitoring in areas such as basements etc.

Refer to Chapter 5 for Confined Space mode operation.

Barhole

Used to locate underground leaks. This can be timed or non-timed. Your company may have selected only one of these options.

Refer to Chapter 6 for Barhole mode operation.

The CO (Carbon Monoxide) mode allows the user to make either CO Direct, Differential CO, or Air Free CO readings (if an O chosen only certain of these options.

cell is fitted). Note: Your company may have

Refer to Chapter 7 for CO mode operation.

2-2

GENERAL FEATURES

Purge

This mode is used in gas and air purging applications.

Refer to Chapter 8 for Purge mode operation.

Sniffer

This mode is used to find small fitting leaks. Very fast detection rates are achieved using the semiconductor sensor in the probe.

Refer to Chapter 9 for Sniffer mode operation.

Pressure

In this mode, the instrument can be used as a manometer to measure appliance and regulator pressure and to check the system for leaks.

Refer to Chapter 10 for Pressure mode operation.

2-3

USER HANDBOOK

2-4

OPERATING PROCEDURE

Check the following:

 The instrument is clean and in good condition.

 The batteries are in good condition, fully charged

and fitted correctly.

 The hydrophobic filter is clean and in good condi-

tion.

 The sample line and any other accessories used

are in good condition.

 The clear bulb at probe end is screwed tightly.

 Switch instrument ON in fresh air.

 The battery indication provides sufficient

capacity for the operation.

 The instrument is within the calibration period you

have decided is necessary for your application.

 All applicable ranges are operational.

 There are no fault indications.

 Attach optional accessories, as required.

 The instrument displays a sample / flow fault when

inlet is blocked (with a finger for example). If fault is not displayed, check tightness of all fittings.

 After use, allow the instrument to run for 1  2

minutes in fresh air before switching the instrument OFF.

3-1

USER HANDBOOK

Each time you use the instrument, carry out the following procedure:

3.1 SWITCH THE INSTRUMENT ON

To switch the instrument ON in fresh air:

 Press and hold the RH button

, for one second.

Fig. 3.1 Switch ON

The instrument begins its warm-up routine, which lasts approximately 30 seconds. During the warm-up cycle, a countdown timer appears in the top right hand corner of the display.

The Power ON LED illuminates when the instrument is switched ON and also during operation. The display backlight illuminates and remains ON during warm-up. When the warm-up cycle is complete, the screen light automatically switches OFF.

The Fault LED illuminates briefly, for approximately five (5) seconds, during the warm-up cycle.

3-2

OPERATING PROCEDURE

100%

75%

50% 25%

3.2 INSTRUMENT IDENTIFICATION

During the warm-up cycle, the instrument display identifies the model, serial number, software version and battery status information as shown in Fig. 3.2:

Fig. 3.2 Instrument Identification

3.3 BATTERY STATUS

This feature provides the user with a battery capacity level indicator that displays instrument battery power remaining, as shown in Fig. 3.3.

Fig. 3.3 Battery Capacity

This battery symbol will be indicated for approximately five (5) seconds during the warm-up cycle, then on the top of the display during normal operation.

3-3

USER HANDBOOK

3.4 TIME AND DATE

The time and date from the instruments built-in clock is displayed on the screen during warm-up, as shown in Fig. 3.4.

If datalogging is being used, the time and date is set from this clock. This may be important when viewing the logged data.

Fig. 3.4 Time and Date

3.5 CALIBRATION DUE DATE

The CAL DUE date can be set by the workshop and is set to 365 days by default. The date can be set from 1 to 400 days.

The CAL DUE is reset when the instrument is successfully calibrated.

The CAL DUE feature has five (5) configurable options:

1. Cal Due Date message is not displayed.

3-4

OPERATING PROCEDURE

2. Cal Due Date and overdue date messages are displayed.

Calibration due date is displayed, as shown in Fig.

3.5.

Fig. 3.5 Calibration Due Date

The screen, shown in Fig. 3.6, is displayed when the Calibration date has expired. i.e. overdue.

Fig. 3.6 Calibration Overdue

After approximately five (5) seconds, the instrument warm-up continues.

3-5

USER HANDBOOK

3. Cal Due Date message is displayed with user acknowledge if overdue (Default).

Calibration due date is displayed as shown in Fig.

3.7.

Fig. 3.7 Calibration Due Date

The screen, shown in Fig. 3.8, is displayed when the Calibration date has expired. i.e. overdue.

Fig. 3.8 Calibration Overdue

The user must acknowledge that Calibration has expired.

To continue:

 Press and hold YES for instrument warm-up

to continue.

3-6

OPERATING PROCEDURE

To switch OFF:

 Press and hold NO . The screen, shown in

Fig. 3.9, is displayed.

Fig. 3.9 Switch OFF

Press and hold both the LH button and the RH



button

switch-off sequence.

4. Cal Due Date message is displayed with user acknowledge for extended period option, if overdue.

Calibration Due Date message is displayed, as shown in Fig. 3.10.

simultaneously to proceed with the

Fig. 3.10 Calibration Due Date

3-7

USER HANDBOOK

If overdue but within the extended period, the screen, shown in Fig. 3.11, is displayed.

Fig. 3.11 Calibration Overdue

The user must acknowledge that Calibration has expired.

Note: The extended period can be set from 1 to

To accept extended period option:



up continues.

Note: When the extended period option expires,

To reject extended period option:

31 days

Press and hold YES and the instrument warm-

the user will be forced to switch the instrument OFF.

 Press and hold NO . The screen, shown in

Fig. 3.12, is displayed.

3-8

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