GMI GT Series User Handbook Manual

Gas Measurement Instruments Ltd

User Handbook

Issue 9

08/01/2016

Part Number: 67112

USER HANDBOOK

COPYRIGHTUSER HANDBOOK

COPYRIGHT

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

LIABILITY

Every care has been taken in the preparation of this document, but GMI 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 specication 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
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 specication 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 GMI. Reproduction or disassembly of such embodied programmes
or algorithms is prohibited. Ownership of such software is not transferable and
GMI 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.

GT series

GT series

instruments.

product. Please note

i

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 tted correctly before use.
Never use damaged batteries or expose to extreme heat.
See Chapter 13 : 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 ameproof assembly and must not be

opened in the presence of a ammable atmosphere.

•

GT series

SIRA 05ATEX II 2 G EEx iad IIB T3

• This equipment is designed and manufactured to protect against other

hazards as dened 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 ammable or combustible atmospheres,

remove batteries before servicing.

WARNING: To prevent ignition of ammable or combustible atmospheres, read,

understand and adhere to the manufacturer’s live maintenance procedures.

WARNING: To reduce the risk of ignition of a ammable 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 instrument batteries only with approved batteries, as follows:

ATEX / IECEx APPROVED INSTRUMENTS:

• See ‘SPECIAL CONDITIONS FOR SAFE USE’ on the following page.

UL APPROVED INSTRUMENTS:

• Alkaline: Any ‘LR14’ type

• Rechargeable NiMH: Any ‘C’ type

instruments are certied as:

UL 913 Class I, Div 1 Groups C and D.

ii

COPYRIGHTUSER HANDBOOK

SPECIAL CONDITIONS FOR SAFE USE

Note: For ATEX / IECEx approved instruments only.

1. When the batteries are replaced, only the following non-rechargeable
cells are permitted:

Energizer No. E93, Alkaline, (Zn/MnO2), LR14 Size ‘C’ cell
Duracell Procell, Alkaline, (Zn/MnO2), LR14 Size ‘C’ cell
Duracell Plus, Alkaline, (Zn/MnO2), LR14 Size ‘C’ cell
Duracell, Alkaline, (Zn/MnO2), LR14 Size ‘C’ cell

2. When the batteries are replaced, only the following rechargeable cells
are permitted:

Panasonic 3000mAh Sub-C size, Nickel Metal Hydride cells type
HHR300SCP

AREAS OF USE

Exposure to certain chemicals can result in a loss of sensitivity of the ammable

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. Do not use in areas where explosive concentrations of
Hydrogen may be present. 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 instrument is sealed to IP54. 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

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).

instrument has a warranty against faulty goods or workmanship

iii

iv

CONTENTS

COPYRIGHT ............................................................................ i

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

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

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

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

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

SPECIAL CONDITIONS FOR SAFE USE ..............................iii

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

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

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

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

1.1 INSTRUMENT RANGES ................................. 1-2

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

2.1 MODES OF OPERATION ................................ 2-2

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

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

3.2 INSTRUMENT IDENTIFICATION ................... 3-2

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

v

3.4 FILTER CHECK / FLOW FAULT TEST ............ 3-3

3.5 TIME AND DATE .............................................. 3-4

3.6 CALIBRATION DUE DATE............................... 3-4

3.7 SERVICE DUE DATE ...................................... 3-8

3.8 SENSORS ZEROING .....................................3-11

3.9 SWITCH THE INSTRUMENT OFF OR

RE-ENTER THE MODE MENU ............................ 3-12

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

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 ................ 4-5

4.5 DESCRIPTION OF LEAK TEST BUTTON

OPERATION ........................................................... 4-5

4.6 LEAK TEST TICKER (GEIGER) FUNCTION ... 4-9

4.7 LEAK TEST ALARMS .................................... 4-10

4.8 LEAK TEST LOGGING .................................. 4-10

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............................ 5-3

5.5 DESCRIPTION OF CSM BUTTON

OPERATION ........................................................... 5-4

5.6 CSM PUMP ...................................................... 5-6

vi

CONTENTSUSER HANDBOOK

5.7 CSM ALARMS .................................................. 5-6

5.8 CSM LOGGING ............................................... 5-6

5.9 CSM CONFIDENCE SIGNAL .......................... 5-7

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 ............................ 6-7

6.5 BARHOLE OPERATION .................................. 6-8

6.6 DESCRIPTION OF BARHOLE BUTTON

OPERATION ........................................................... 6-8

6.7 BARHOLE ALARMS ...................................... 6-10

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

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

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

7.3 CO MENU ........................................................ 7-1

7.4 CO DISPLAYS ................................................. 7-2

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

vii

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

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

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

8.3 PURGE DISPLAYS .......................................... 8-1

8.4 PURGE BUTTON OPERATION ....................... 8-2

8.5 DESCRIPTION OF PURGE BUTTON

OPERATION ........................................................... 8-3

8.6 PURGE ALARMS ............................................. 8-4

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

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

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

9.3 SNIFFER DISPLAYS ....................................... 9-2

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

9.5 DESCRIPTION OF SNIFFER BUTTON

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

9.6 SNIFFER TICKER (GEIGER) INDICATION ..... 9-5

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

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

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

10.3 PRESSURE DISPLAYS .............................. 10-1

10.4 PREPARE INSTRUMENT

(PRESSURE MODE) ............................................ 10-2

10.5 PRESSURE BUTTON OPERATION ............ 10-3

viii

CONTENTSUSER HANDBOOK

10.6 DESCRIPTION OF PRESSURE BUTTON

OPERATION ......................................................... 10-3

10.7 PRESSURE ALARMS .................................. 10-4

BUMP TEST MODE .......................................... 11-1

11.1 BUMP TEST RANGES ..................................11-1

11.2 BUMP TEST FEATURES ..............................11-1

11.3 BUMP TEST DISPLAYS ...............................11-2

11.4 BUMP TEST BUTTON OPERATION ............11-5

11.5 BUMP TEST LOGGING ................................11-6

ALARMS ............................................................ 12-1

12.1 GAS ALARMS .............................................. 12-1

12.2 FLAMMABLE (LEL) ALARMS ...................... 12-1

12.3 OXYGEN (O2) ALARMS .............................. 12-1

12.4 TOXIC GAS (e.g. CO) ALARMS ................. 12-1

12.5 ALARM TYPES ............................................ 12-6

12.6 FAULT ALARMS ........................................... 12-9

OPERATOR MAINTENANCE ........................... 13-1

13.1 CLEANING ................................................... 13-1

13.2 FILTER REPLACEMENT ............................ 13-1

13.2.1 Dust Filter .................................................. 13-2

13.2.2 Hydrophobic Filter ..................................... 13-3

13.2.3 Chemical Filter (Accessory) ...................... 13-5

13.2.4 Cotton Filter (Accessory) ........................ 13-10

ix

13.3 BATTERY REPLACEMENT ...................... 13-12

13.3.1 Remove and Replace Batteries ............. 13-13

13.3.2 Charging (Rechargeable) Batteries......... 13-17

CALIBRATION ................................................... 14-1

14.1 CALIBRATION VALIDITY ............................ 14-2

ACCESSORIES................................................. 15-1

ADDITIONAL INFORMATION ........................... 16-1

Training ................................................................. 16-1

World Wide Web ................................................... 16-1

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

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

Weight (including 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

QUICK OPERATING INSTRUCTIONS ...............B-1

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

x

Up

LH

RH

Centre

Down

INTRODUCTION

The GMI

GT series

multi-application gas detectors to suit all the needs of a Gas Industry
Service Technician.

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

page:

instruments are designed to be multifunction,

Fig. 1.1

GT series

Instrument

Fig. 1.2 Button References

1

1-1

Button Text Reference

LH (INVERT): LH button

Centre (RANGE): Centre button

RH (PUMP): RH button

Up: UP button

Down: DOWN button

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.

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 Methane (CH4) Flammable - Sniffer Range

• 0-100% LEL Methane (CH4) Flammable

• 0-100% VOL Methane (CH4) Flammable

• 0-25% Oxygen (O2)

• 0-2000 ppm Carbon Monoxide (CO)

• 0-100 ppm Hydrogen Sulphide (H2S)

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

Fig 1.3 Option Select

1-2

INTRODUCTIONUSER HANDBOOK

Note 1: This instrument is calibrated for Methane (CH4)

PPM & LEL ranges, although calibrated for CH4, will

Avoid exposing the VOL gas range to ammable gases

Note 2: Some sensors respond to gases other than the target

ammable gas.

respond to other ammable gases but will only detect

CH4 accurately.

other than CH4 as this can cause a zero shift on all

ammable ranges that may eventually result in a fault

alarm.

gas. Typically, this cross response is not enough to result
in operational problems, however, should you have any
concerns, please contact GMI.

1-3

1-4

2

GENERAL FEATURES

• An integral pump draws the required sample over all of the

sensors

• The pump flow is monitored by means of a pressure

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.

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

congured only for certain of the aforementioned applications.

2-1

2.1 MODES OF OPERATION

Leak Test: This mode is for the technician to investigate odour or

See Chapter 4 for ‘Leak Test’ mode operation.

Conned Space: Used for conned space pre-entry testing and for

See Chapter 5 for ‘Conned Space’ mode operation.

Barhole: Used to locate underground leaks. This can be timed or

See Chapter 6 for ‘Barhole’ mode operation.

CO: The CO (Carbon Monoxide) mode allows the user to make

See Chapter 7 for ‘CO’ mode operation.

Purge: This mode is used in gas and air purging applications.
See Chapter 8 for ‘Purge’ mode operation.

Sniffer: This mode is used to nd small tting leaks. Very fast

See Chapter 9 for ‘Sniffer’ mode operation.

Pressure: In this mode, the instrument can be used as a manometer

See Chapter 10 for ‘Pressure’ mode operation.

Bump Test: This mode allows the user to set up gases, apply gases, log

See Chapter 11 for ‘Bump Test’ mode operation.

leak complaints and to pinpoint the leak.

personal monitoring in areas such as basements etc.

non-timed. Your company may have selected only one of

these options.

either CO Direct, Differential CO, or Air Free CO readings (if
an O2 cell is tted). Note: Your company may have chosen
only certain of these options.

detection rates are achieved using the semiconductor
sensor in the probe.

to measure appliance and regulator pressure and to check
the system for leaks.

the readings automatically and view the logged information.
By default, this mode is disabled.

2-2

OPERATING PROCEDURE

Check the following:

• The instrument is clean and in good condition.

• The batteries are in good condition, fully charged and tted
correctly.

• The hydrophobic lter is clean and in good condition.

• 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 sufcient 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 / ow fault when inlet is

blocked (with a nger for example). If fault is not displayed,
check tightness of all ttings.

• After use, allow the instrument to run for 1 – 2 minutes in
fresh air before switching the instrument OFF.

3

3-1

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 briey, for approximately ve (5) seconds,

during the warm-up cycle.

3.2 INSTRUMENT IDENTIFICATION

During the warm-up cycle, the

instrument display identies the

model, serial number, software
version and battery status
information as shown in Fig. 3.2:

3-2

Fig. 3.2 Instrument I/d

OPERATING PROCEDUREUSER HANDBOOK

100%

75%

50%

25%

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.

This battery symbol will be

indicated for approximately ve

(5) seconds during the warm­up cycle, then on the top of the
display during normal operation.

Fig. 3.3 Battery Capacity

3.4 FILTER CHECK / FLOW FAULT TEST

Checking lters are in place and in good condition and performing a

regular leak check are pertinent to effective use of the GT instrument,

therefore, the user will be asked to conrm these checks before the

instrument completes the warm-up sequence. By default, these
checks should be performed on a daily basis.

3.4.1 Filter Check

If filters are installed, and in

good condition, press ‘YES’ for

instrument warm-up to continue.

If ‘NO’ is selected, instrument
will automatically enter ‘switch
off’ sequence.

3.4.2 Flow Fault Test

To perform a ow fault test, block probe tip inlet with nger for
approximately 5 seconds. Pump should ow fault and display screen

illustrated in Fig. 3.6.

If ‘YES’ is selected, instrument

warm-up will continue without
performing test.

If ‘NO’ is selected, instrument
will automatically enter ‘switch
off’ sequence.

Fig. 3.4 Filter Check

Fig. 3.5 Flow Fault Test

3-3

A successful ow fault test is

confirmed, as shown in Fig.

3.6, by ‘successful’ ashing in

the display.

If the instrument fails the ow

fault test, the screen shown in
Fig. 3.5 is displayed.

The instrument stores a log of
a successful test. Likewise, if

‘YES’ was selected, in Fig. 3.5,
without performing a ow fault

test, a log is also recorded.

On completion, select ‘YES’

to switch the pump ON and
continue warm-up cycle.

alternating with

Fig. 3.6 Successful Test

3.5 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. 3.7.

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

Fig. 3.7 Time and Date

3.6 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 ve (5) congurable options:

1. Cal Due Date message is not displayed.

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

3-4

OPERATING PROCEDUREUSER HANDBOOK

Calibration due date is
displayed, as shown in
Fig. 3.8.

Fig. 3.8 Calibration Due Date

The screen, shown in Fig.

3.9, is displayed when

the Calibration date has
expired. i.e. overdue.

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

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

Calibration due date is
displayed as shown in Fig.

3.10.

The screen, shown in Fig.

3.11, is displayed when
the Calibration date has
expired. i.e. overdue.

Fig. 3.9 Calibration Overdue

Fig. 3.10 Calibration Due Date

Fig. 3.11 Calibration Overdue

3-5

The user must acknowledge that Calibration has expired.

To continue:

• Press and hold YES for instrument warm-up to continue.

To switch OFF:

• Press and hold NO .

The screen, shown in Fig.

3.12, is displayed.

Fig. 3.12 Switch OFF

• Press and hold both the LH button and the RH button

simultaneously to proceed with the 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. 3.13.

Fig. 3.13 Calibration Due Date

If overdue but within the
‘extended period’, the
screen, shown in Fig. 3.14,
is displayed.

3-6

Fig. 3.14 Calibration Overdue

OPERATING PROCEDUREUSER HANDBOOK

The user must acknowledge that Calibration has expired.

Note: The extended period can be set from 1 to 31 days

To accept ‘extended period’ option:

• Press and hold YES and the instrument warm-up continues.

Note: When the extended period option expires, the user will be

forced to switch the instrument OFF.

To reject ‘extended period’ option:

• Press and hold NO .

The screen, shown in Fig.

3.15, is displayed.

Fig. 3.15 Switch OFF

• Press and hold both the LH button and the RH button

simultaneously to proceed with the switch-off sequence.

5. Cal Due Date message is displayed with user shut-down

if overdue.

Calibration due date is
displayed, as shown in Fig.

3.16.

Fig. 3.16 Calibration Due Date

The screen, shown in Fig.

3.17, is displayed when the
Calibration date has expired.
i.e. overdue.

Fig. 3.17 Switch OFF

3-7

To proceed with the switch-off sequence.

• Press and hold both the LH button and the RH button

simultaneously.

3.7 SERVICE DUE DATE

The Service due date can be set by the workshop and is set to two
(2) years by default from last service date. The date can be set over
a period of 1 to 36 months in 1 month steps.

Note : The service due date will not normally be displayed at

start up but if display is selected, it will be shown at 90
days prior to the preset date, as shown in Fig. 3.15.

The SERVICE DUE feature has ve (5) congurable options:

1. Service Due Date message is not displayed (Default).

2. Service Due Date and overdue date messages are displayed,
as shown in Fig. 3.18.

Fig. 3.18 Service Due Date

The screen, shown in Fig.

3.19, is displayed when the
Service date has expired.
i.e. overdue.

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

Fig. 3.19 Service Overdue

3-8

OPERATING PROCEDUREUSER HANDBOOK

3. Service Due Date message is displayed with user

acknowledge if overdue.

Service due date is
displayed, as shown in
Fig. 3.20.

Fig. 3.20 Service Due Date

The screen, shown in
Fig.3.21, is displayed
when the Service date has
expired, i.e. overdue.

Fig. 3.21 Service Overdue

The user must acknowledge that Service has expired.

To continue:

• Press and hold YES for instrument warm-up to continue.

To switch OFF:

• Press and hold NO .

The screen, shown in Fig.

3.22, is displayed.

Fig. 3.22 Switch OFF

• Press and hold both the LH button and RH button

simultaneously to proceed with the switch-off sequence.

3-9

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

Service Due Date message
is displayed, as shown in
Fig. 3.23.

Fig. 3.23 Service Due Date

If overdue but within the
‘extended period’, the
screen, shown in Fig. 3.24,
is displayed.

Fig. 3.24 Service Overdue

The user must acknowledge that Service has expired.

Note: The extended period can be set from 1 to 31 days

To accept ‘extended period’ option:

• Press and hold YES and the instrument warm-up continues.

Note: When the extended period option expires, the user will
be forced to switch the instrument OFF.

To reject ‘extended period’ option:

• Press and hold NO .

The screen shown in Fig.

3.25 is displayed.

3-10

Fig. 3.25 Switch OFF

OPERATING PROCEDUREUSER HANDBOOK

• Press and hold both the LH button and the RH button

simultaneously to proceed with the switch-off sequence.

5. Service Due Date message is displayed with user shut-

down if overdue.

Service due date is
displayed, as shown in
Fig. 3.26.

Fig. 3.26 Service Due Date

The screen, shown in Fig.

3.27, is displayed when the
Service date has expired,
i.e. overdue.

Fig. 3.27 Switch OFF

To proceed with the switch-off sequence:

• Press and hold both the LH button and the RH button
simultaneously.

3.8 SENSORS ZEROING

Before warm-up is completed, the instrument automatically ensures
that the sensors are zeroed before operation.

The screen shown in Fig.

3.28 is displayed during this

process.

Fig. 3.28 Zero Sensors

3-11

Warm-up Complete

The instrument will now automatically select the Leak Test Mode,
as default.

The following congurable options are available:

a) To start up in specic operational mode.

b) To start up in the mode last used.

3.9 SWITCH THE INSTRUMENT OFF OR RE-ENTER THE MODE MENU

To initiate the shut down sequence:

• Press and hold both the LH and RH buttons
simultaneously.

Fig. 3.29 Switch OFF

While both buttons are depressed, the instrument display will step
through previous menus, each displayed for approximately two (2)
seconds.

3-12

OPERATING PROCEDUREUSER HANDBOOK

After this time, the OFF sequence countdown begins and the user
will have to keep the buttons pressed for a further three (3) seconds
to switch the instrument OFF. The countdown sequence is shown
in Fig. 3.30.

Note: In Conned Space Mode, to prevent inadvertently switching

instrument OFF or changing mode while alarms are active,

the user must press and hold both the LH and RH

buttons simultaneously for an additional ve (5) seconds

before the mode menu appears.

Fig. 3.30 OFF sequence

The switching OFF sequence
can be aborted at any time
by releasing the held buttons
which provides access to the
Mode menu, shown in Fig.

3.31:

Fig. 3.31 Mode Menu

3-13

To highlight the required option:

• Press the UP or DOWN buttons, then . .

To select the highlighted option:

• Press and hold OK .

3-14

4

LEAK TEST MODE

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

Note: The instrument pump must be switched ON to measure

in Leak Test mode.

4.1 LEAK TEST RANGES

Leak Test mode will have the following ranges available for normal
operation:

• 0 – 2000 ppm Methane (CH4) Flammable with following
options:

(to display as LEL with 0.1% resolution up to 9.9%).
(to display without numerical indication).
(to display zero until gas reading exceeds 100 ppm).

• 0 – 100% LEL Methane (CH4) Flammable with option:
(to display as gas in air).

• 0 – 100% VOL Methane (CH4) Flammable.

• 0 – 2000 ppm Carbon Monoxide (CO) if tted.

4.2 LEAK TEST FEATURES

Leak Test mode will have the following features available:

• Audible / Visual PPM Ticker (Geiger) Indication

• Audible / Visual Gas Alarms

• Backlight

• Flashlight

• Pump - can be toggled ON / OFF and will stop if ow fault

is detected

• Max Display

• Autoranging from ppm-LEL-Gas

• Manual Range selection between Flam and Flam plus CO
(Dual Display)

• Threshold adjustment

• Display Invert

• Automatic datalogging

4-1

4.3 LEAK TEST DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is indicated
by a flashing gas reading, as
illustrated in Fig. 4.1.

A negative zero fault is indicated
by a spanner alternating with
a zero reading (not illustrated).

After the sensors have been
checked, the normal display will
be as shown in Fig. 4.2.

Note 1: Any faulty sensor will
continue to display a spanner
(wrench) symbol alternating with
the gas reading and the fault LED
will illuminate.

Note 2: Continuous display of
both flammable and CO is a

congurable option, as shown

in Fig. 4.3.

alternating with

Fig. 4.1 Sensor Check

Fig. 4.2 Normal Display

Example

4-2

Fig. 4.3 Flammable / CO

Display

LEAK TEST MODEUSER HANDBOOK

4.3.1 Ticker (Geiger)

To enable / disable the audible Ticker (Geiger):
(in the PPM range)

• Press and hold the UP and DOWN buttons
simultaneously, as follows:

1. First press and hold - to enable visual only.

2. Second press and hold - to disable both audible and visual.

3. Third press and hold - to enable both audible and visual.

When the PPM autoranges to
LEL, the display changes to the
example shown in Fig. 4.4.

Fig. 4.4 LEL Display

If displaying the maximum
reading, the display will be as
the example shown in Fig. 4.5.

Note: Maximum display only

for LEL and VOL.

Fig. 4.5 Max Reading

To return the display to normal (live) operation:

• Press and hold LIVE .

Note: If the LH button is not pressed, the display will return to

normal after 30 seconds.

4-3

If a CO sensor is included in
your instrument and the CO
concentration rises above a pre­set level, the display will change
together with an audible alarm
to attract your attention. If alarm
is enabled, CO alternates with

HIHI until cleared.

To acknowledge the alarm:

• Press and hold ACK .

After acknowledgement of the
alarm, the screen, shown in Fig.

4.7, is displayed.

When CO levels are below alarm concentration, the Centre button

enables return to ammable only. This button can be pressed

at any time to change between Flammable and Flammable + CO.

alternating with

Fig. 4.6 CO Alarm

Fig. 4.7 Alarm Acknowledge

4-4

ACTION

PRESS

PRESS

and

HOLD

LH

(INVERT)

FLAM PPM

ZERO

BACKLIGHT /
FLASHLIGHT

ACKNOWLEDGE

ALARM

MAX / LIVE

RANGE

FLAM

FLAM + CO

INVERT

DISPLAY

RH

(PUMP)

CENTRE

(RANGE)

PUMP

ON / OFF

CLEAR FLOW

FAULT

LEAK TEST MODEUSER HANDBOOK

4.4 LEAK TEST BUTTON OPERATION

A summary of the button operation is detailed in Table 4.1:

Table. 4.1 Button Operation in Leak Test Mode

4.5 DESCRIPTION OF LEAK TEST BUTTON OPERATION

4.5.1 Ticker (Geiger) ON / OFF

To enable and disable the audible Ticker (Geiger):
(in the PPM range)

• Press and hold the UP and DOWN buttons
simultaneously, as follows:

1. First press and hold - to enable visual only.

2. Second press and hold - to disable both audible and visual.

3. Third press and hold - to enable both audible and visual.

When PPM autoranges to LEL, the Ticker (Geiger) audible/visual
continues until an LEL alarm is reached. The Ticker (Geiger) is then
switched off and the LEL alarm will be activated. If no LEL alarm is
set, the Ticker (Geiger) will remain activated.

4-5

4.5.2 Ticker (Geiger) Adjust

To adjust the Ticker (Geiger) threshold:

To increase

• Press and hold the UP button.

To decrease

• Press and hold the DOWN button.

The threshold setting is

displayed briey beneath the

PPM CH4. In the example
opposite, Fig. 4.8, the threshold
is 500.

Fig. 4.8 Ticker (Geiger)

4.5.3 Range Selection

The instrument initially selects the PPM range which autoranges to
LEL/VOL.

Note: When CO range is selected the display reverts to the 2-gas
display.

A congurable option in Leak Test mode enables user to manually

select between PPM, and autoranging between LEL & Volume.
By default, the reading will show LEL (autoranging to volume).

• Press the Centre button , to toggle to PPM.

If a CO range is present in the GT, and this option is enabled, it is no
longer possible to toggle between one and two ranges on the display.
It will always be the ammable range and the CO range.

4.5.4 Lights

To switch ON the backlight:

• Press and hold the Centre button .

Threshold

4-6

LEAK TEST MODEUSER HANDBOOK

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after two

minutes. Both can be switched OFF by a third press and hold of the

Centre button .

4.5.5 Max / Live

To show the Maximum readings:
(since the mode was selected)

• Press and hold the LH button .

To return display to the live reading.

• Press and hold the LH button again.

Note 1: If the instrument is in alarm, the Max function cannot be

used until the alarm is Acknowledged.

Note 2: If no button is pressed, after 30 seconds the display reverts

to live reading.

4.5.6 Alarm Acknowledge

Non-latching can be muted for one (1) minute or, when the
concentration drops below the alarm level, the alarm will automatically
cancel.

Latched Alarms can be muted temporarily for one minute or cancelled
permanently when the display level is below alarm level.

To acknowledge / mute latched alarms:

• Press and hold the LH button .

4-7

4.5.7 Pump

To switch the pump ON and OFF:

• Press the RH button .

4.5.8 Zero

To zero the Flammable PPM range when displayed:

• Press and hold the RH button .

Note: The pump must be switched ON to zero the ammable ppm

range.

4.5.9 Flow Fault

If ow fault is detected, the pump stops automatically. The instrument

should be checked for water ingress or blockage and the pump reset.

To clear the ow fault:

(Once the blockage has been cleared):

• Press the RH button .

4.5.10 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and the RH button

simultaneously

When the menu appears on the screen, release the buttons,
otherwise the instrument will proceed into the switch OFF
process and will switch OFF after a further three (3) seconds.

.

4-8

LEAK TEST MODEUSER HANDBOOK

4.6 LEAK TEST TICKER (GEIGER) FUNCTION

The Ticker (Geiger) function is available on ammable ppm range.

The Ticker (Geiger) range at start-up is 0-1000 PPM.

For any subsequent PPM concentration, the Ticker (Geiger) audible

/ visual can be ‘backed off’ using the UP or DOWN buttons.

e.g. 600 PPM Ticker (Geiger) can be ‘backed off’ to enable tracing
to higher concentrations, in which case the Ticker (Geiger) range
becomes 600 to 1600 PPM etc, etc.

Note: The display range remains always as 0 to 2000 PPM.

The Ticker (Geiger) visual is such that the lights illuminate in pairs
according to Fig. 4.9 over any 1000 PPM range as explained above.

4.6.1 Select Audible / Visual Ticker (Geiger)
Combination Option

The Ticker (Geiger) function can be set for audible and visual
combination options as follows: Both ON; Audible OFF / Visual ON;
Both OFF; Both ON; etc.

To select required audible / visual combination option:

• Press and hold both UP and DOWN buttons.

• Repeat operation to cycle through combination options.

Fig. 4.9 PPM Level / LED Sequence

4-9

4.7 LEAK TEST ALARMS

Refer to Chapter 11.

4.8 LEAK TEST LOGGING

Automatic datalogging is active for CO and CH4 ranges (except ppm
CH4). Timed logs will be recorded every minute (default) or as per

conguration.

4-10

5

CONFINED SPACE MODE

This mode is used for conned space pre-entry testing and for

personal monitoring in areas such as basements etc.

5.1 CSM RANGES

Conned Space Mode (CSM) will have the following ranges available:

• 0 – 100% LEL Methane (CH4) Flammable

(EEE Over-range) and option to display up to 9.9% LEL with

0.1% resolution

• 0 – 25% Oxygen (O2) if tted

• 0 – 2000 ppm Carbon Monoxide (CO) if tted

• 0 – 100 ppm Hydrogen Sulphide (H2S) if tted

5.2 CSM FEATURES

Conned Space mode will have the following features available:

• Audible / Visual Alarms.

• Min / Max Display.

• Backlight.

• Flashlight.

• Pump – ON continuously - will not stop if ow fault is detected

- ow fault alarm will be activated.

• Datalogging – automatic every 60 seconds.

• Manual Logging is also available. This will log all gas
concentrations at that instant.

• Time weighted averaging for Alarms.

• Condence signal every 15 seconds.

• Display invert.

5-1

5.3 CSM DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is indicated
by a flashing gas reading, as
illustrated in Fig. 5.1.

A negative zero fault is indicated
by a spanner alternating with
a zero reading (not illustrated).

When an instrument has an
alarm active, the bottom line of
the display changes. A sample
fault will change both top and
bottom lines, as shown in
Fig. 5.2:

alternating with

5.1 Four Gas Sensor Check

alternating with

5-2

Fig. 5.2 Four-gas Display with

Alarm and Sample Fault

CONFINED SPACE MODEUSER HANDBOOK

When viewing Max in conned

space mode, Confined Max
identifier is in the top of the
display, with the option of
selecting Min on the bottom line,
as shown in Fig. 5.3:

Fig. 5.3 Conned Max Identier

When viewing Min in conned

space mode, Confined Min
identifier is in the top of the
display, with the option of
selecting Live on the bottom
line, as shown in Fig. 5.4:

Fig. 5.4 Conned Min Identier

5.4 CSM BUTTON OPERATION

A summary of the button operation is detailed in Table 5.1:

Table. 5.1 Button Operation in Conned Space Mode

5-3

5.5 DESCRIPTION OF CSM BUTTON OPERATION

5.5.1 Lights

To switch ON the backlight:

• Press and hold the Centre button .

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after

two minutes or can be switched OFF by a third press and hold the

Centre button .

5.5.2 Min / Max

To show the Maximum gas readings:

(since the current mode was selected)

• Press and hold the LH button .

To show the Minimum gas readings:

(since the current mode was selected)

• Press and hold the LH button again.

A third press and hold the LH button returns to the live reading.

Note1: If the instrument is in alarm, the Min / Max function cannot

be used until the alarm is Acknowledged.

Note 2: If no button is pressed, after 30 seconds the display reverts

to live reading.

5-4

CONFINED SPACE MODEUSER HANDBOOK

5.5.3 Alarm Acknowledge

HIHI, LOLO for O2 (if tted), and Time Weighted Average (TWA)
alarms are latching by default. The AL / ACK will only cancel the
alarms if all gases have returned to “safe” levels.

An option of HI, or LO for O2 (if tted), non latching alarms are
available, as follows:

When the reading drops below the alarm level, the alarm will
automatically cancel.

Alarms can also be muted for one minute.

To acknowledge for one minute:

• Press and hold the LH button .

If an alarm occurs in CSM, the user should go into fresh air until
the gas concentration falls below the alarm level and is cancelled.

Menu mode can still be entered while an alarm is active in CSM.

To enter menu mode:

• Press and hold the LH button and the RH button

simultaneously, for 5 seconds.

5.5.4 Flow Fault

Before clearing a ow fault alarm the instrument must be checked

for water ingress or blockage.

To clear a Flow Fault alarm:

• Press the RH button .

5.5.5 Manual Log

A manual log can be taken at any time.

To capture a manual log:

• Press and hold the RH button .

5-5

Note: When a manual log is taken, the term ‘LOG’ is inversed on

the display for one (1) second to provide a visual conrmation

that the log has been captured.

5.5.6 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and RH button .

When the menu appears on the screen, release the buttons,
otherwise the instrument will proceed into the switch OFF
process and will switch OFF after a further three (3) seconds.

Note: In Conned Space Mode, to prevent inadvertently switching

instrument OFF or changing mode while alarms are active,

the user must press and hold both the LH and RH

buttons simultaneously for an additional ve (5) seconds

before the mode menu appears.

5.6 CSM PUMP

The pump will run continuously for safety reasons.

Flow Fault will be agged and fault LED illuminated.

To clear the ow fault:

• Press and hold the RH button .

5.7 CSM ALARMS

Refer to Chapter 11.

5.8 CSM LOGGING

Automatic datalogging is active for all ranges available. Timed logs

will be recorded every minute (default) or as per conguration.

Manual Logging is also available. This will log all gas concentrations
at that instant.

5-6

CONFINED SPACE MODEUSER HANDBOOK

5.9 CSM CONFIDENCE SIGNAL

During normal operation, the instrument sounds a condence beep
and illuminates the bottom pair of red LED’s briey every 15 seconds.

This function is programmable in the instrument setup software.

The condence signal function makes the user aware that the

instrument is operating correctly:

Note: The condence beep and / or LED indication can be disabled.

Refer to the ‘SET-UP SOFTWARE USER HANDBOOK’ for further
information.

5-7

5-8

6

BARHOLE TESTING MODE

This mode is used to locate underground leaks and on start-up will
be ranged to 0-100% LEL Methane (CH4) Flammable which will
autorange to VOL Methane (CH4) Flammable at 100% LEL.

6.1 BARHOLE RANGES

Barhole testing will have the following ranges available:

• 0 – 100% LEL Methane (CH4) Flammable with the
following option:

(to display with 0.1% resolution up to 9.9%)

• 0 – 100% VOL Methane (CH4) Flammable

6.2 BARHOLE FEATURES

Barhole mode will have the following features:

• Timed or Non-Timed Sampling.

• Backlight.

• Flashlight.

• Pump control.

• Invert Display.

• Six sets of barhole readings with Viewing / Overwriting.

6-1

6.3 BARHOLE DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is
indicated by a flashing gas
reading, as illustrated in Fig.

6.1.

A negative zero fault is
indicated by a spanner
alternating with a zero reading
(not illustrated).

Both timed and non-timed
modes are available to the
user, as shown in display
Fig. 6.2.

USER HANDBOOK

alternating with

Fig. 6.1 Sensor Check

Fig. 6.2 Timed / Non-Timed Mode

To highlight the required option:

• Press the UP or DOWN buttons, then . .

To select the highlighted option:

• Press and hold OK .

Note: The option initially highlighted will be that previously

selected.

Selection

6-2

BARHOLE TESTING MODE

6.3.1 Timed Mode

If TIMED is selected, and the instrument conguration allows user

selectable barhole sample time, the screen shown in Fig. 6.3 is
displayed. The sample time previously set is displayed.

If the instrument conguration

does not allow user selectable
barhole sample time, the screen
shown in Fig. 6.4 is displayed.

Fig. 6.3 Timed Mode

To change the sample time:

• Press the UP or DOWN buttons.

Sample time range = 10 to 300 seconds.

Holding the button will perform a fast ramped change. When

300 is reached, the range rolls over to 10.

To accept:

• Press and hold OK .

When the time is set or has been
pre-selected at 30 seconds
for example, the instrument
performs a purge, as shown
in Fig 6.4.

Fig. 6.4 Purge

The minimum purge time is ten (10) seconds, therefore, the ‘stop’

option is not displayed for the rst ten (10) seconds.

Note: The timer starts at 0 and when 999 is reached, the timer

rolls over to 0.

6-3

USER HANDBOOK

Stop purge when the live readings reach zero:

To stop purge:

• Press and hold OK .

The first barhole

screen is displayed
as shown in Fig. 6.5.

Fig. 6.5 Barhole Timer

Up to six barhole readings can be stored. These are identied as

‘Barhole 1’ to ‘Barhole 6’.

After the rst reading is stored (as Barhole 1), the second reading

(Barhole 2) will be automatically selected, however, by using the

UP or DOWN buttons the user can specify where the next
reading will be stored. This may be useful if there was a problem

with the reading, e.g. sample fault.

The sequence of events will be as follows:

• Press and hold START to initiate timer and pump. Once

started, the user cannot stop a sample.

• Counter decrements from initial value.

• At ‘zero-time’, the
pump switches OFF
and the peak and
final sustained
(actual) readings are
displayed as shown in
Fig. 6.6.

Fig. 6.6 Barhole Numbering

6-4

BARHOLE TESTING MODE

• Between Barhole tests there is a mandatory ‘Purge’ mode
to ensure that any gas in the instrument is cleared before
the next barhole is sampled.

• During purge, the peak
reading is reset to zero
and blanked from
display, as shown in

Fig. 6.7.

Fig. 6.7 Purge Complete

6.3.2 Non Timed Mode

If NON TIMED is selected
or has been pre-selected
in configuration then the
instrument performs a purge,
as shown in Fig. 6.8:

Fig. 6.8 Purge

The minimum purge time is ten (10) seconds, therefore, the ‘stop’

option is not displayed for the rst ten (10) seconds.

Note: The timer starts at 0 and when 999 is reached, the timer

rolls over to 0.

Stop purge when the live readings reach zero:

To stop purge:

• Press and hold OK .

6-5

USER HANDBOOK

The rst barhole screen

is then displayed, as
shown in Fig. 6.9

Fig. 6.9 Non Timed Mode of

Operation

Up to six barhole readings can be stored. These are identied as

‘Barhole 1’ to ‘Barhole 6’.

After the rst reading is stored (as Barhole 1), the second reading

(Barhole 2) will be automatically selected, however, by using the UP

or DOWN buttons the user can specify where the next

reading will be stored. This may be useful if there was a problem
with the reading, e.g. sample fault.

The sequence of events will be as follows:

• Press and hold START to initiate. This will switch the

pump ON. (START on bottom line of LCD will change to
STOP).

• Counter counts up from zero.

• Press and hold STOP when sampling is complete. The

pump will be switched OFF.

• View as per TIMED MODE.

• Purge mode as per TIMED MODE.

• From switch-on, each barhole is consecutively numbered
automatically.

6-6

6.4 VIEW BARHOLE RESULTS

To view previous barhole results:

(to a maximum of six barhole tests)

• Press and hold VIEW

.

Fig. 6.10 View Barhole Results

To return the display to normal operation:

• Press and hold LIVE .

If a *Flow Fault or **Bead Fault
is detected during a barhole
test, the pump will stop and
the test will be aborted with
indication as shown in Fig. 6.11
or Fig. 6.12 respectively.

BARHOLE TESTING MODE

Fig. 6.11 Flow Fault

Fig. 6.12 Bead Fault

* Refer to paragraph 6.6.3 for explanation of Flow Fault.

** Refer to paragraph 6.6.4 for explanation of Bead Fault.

6-7

USER HANDBOOK

LH

(INVERT)

RH

(PUMP)

CENTRE
(RANGE)

ACTION

PRESS

INVERT

DISPLAY

START / STOP /

PURGE

VIEW

BACKLIGHT /
FLASHLIGHT

PRESS

and

HOLD

CLEAR FLOW

FAULT

6.5 BARHOLE OPERATION

A summary of the button operation is detailed in the following table:

Table. 6.1 Button Operation in Barhole Mode

6.6 DESCRIPTION OF BARHOLE BUTTON OPERATION

6.6.1 View

To view previous barhole results:

(to a maximum of six (6) barhole tests)

• Press and hold VIEW .

6.6.2 Lights

To switch ON the backlight:

• Press and hold the Centre button .

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after one

minute. Both can be switched OFF by a third press and hold the

Centre button .

6-8

BARHOLE TESTING MODE

6.6.3 Flow Fault

If a ow fault is detected, the pump stops automatically.

If a sample was in progress then current sample is halted and ‘Purge’
cycle will be the next part of the sequence.

If ow fault is indicated, the instrument should be checked for water

ingress or blockage.

To clear the ow fault:

(Once the blockage has been cleared)

• Press the RH button .

6.6.4 Bead Fault

If a bead fault is detected, the pump stops automatically.

If a sample was in progress then current sample is halted and ‘Purge’
cycle will be the next part of the sequence.

A persistent bead fault indicates a faulty sensor and therefore the
instrument should be returned for service / repair.

6.6.5 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and the RH

button .

While both buttons are depressed, the instrument display

will step through previous menus, each displayed for
approximately two (2) seconds.

When the menu appears on the screen, release the buttons,

otherwise the instrument will proceed into the switch OFF
process and will switch OFF after a further three (3) seconds.

6-9

6.7 BARHOLE ALARMS

There are no Gas Alarms in this mode.

USER HANDBOOK

6-10

7

CO (CARBON MONOXIDE) MODE

The CO mode is used to check the interior of premises and appliances
for CO leakage.

7.1 CO RANGES

The CO mode can have the following ranges available:

• 0 – 2000 ppm Carbon Monoxide (CO)

• 0 – 25% Oxygen (O2) if tted

7.2 CO FEATURES

CO mode has the following features available:

Four possible display options (CO Direct / Differential / Air Free /
Viewing).

• Backlight

• Flashlight

• Datalogging (automatic every 60 seconds)

• Invert Display

• Manual Logging is also available. This will log all gas
concentrations at that instant

• Pump ON / OFF

7.3 CO MENU

On selection of CO mode, all four
of the CO sub-modes shown in

Fig. 7.1 can be available to the

user (See note 3).

Fig.7.1 CO Menu

7-1

To highlight the required option:

• Use the UP and DOWN buttons.

To select the highlighted option:

• Press and hold OK .

Note 1: The highlighted option will be that previously used.

Note 2: If an O2 sensor is not tted then the Airfree Option is

automatically unavailable.

Note 3: Your company may have decided to have its instruments

congured only for certain of the above options. If only one option is

selected, then after selecting CO mode from the main menu, either

7.4.1, 7.4.2 or 7.4.3 will be entered directly.

7.4 CO DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is indicated

by a ashing gas reading, as
illustrated in Fig. 7.2.

A negative zero fault
is indicated by a spanner
alternating with a zero reading
(not illustrated).

alternating with

7-2

Fig. 7.2 Sensor Fault

CO (CARBON MONOXIDE MODE)USER HANDBOOK

7.4.1 CO Direct

In this option, normal
atmospheric air is checked for
CO content.

The typical display for this

mode is shown in Fig. 7.3:

Fig. 7.3 CO Direct

7.4.2 Differential CO

This option enables the user to zero out ambient CO backgrounds and
display the differential measurement. This is useful in areas where

the ambient CO is high from other sources such as trafc pollution.

Note: It is possible to have negative readings on the display in this

mode.

The typical display for this
option is shown opposite, in

Fig. 7.4

Fig. 7.4 Differential CO

To zero the displayed CO reading:

• Press and hold ZERO .

7.4.3 Air-Free CO

Air-free CO is the CO reading modied by the O2 reading, therefore

this measurement will only be available when an O2 sensor is tted.
The purpose is to determine whether or not the emissions from an un­ventilated appliance, principally an oven or a stove / cooker, are safe.

7-3

This is the CO reading modified by the O2 reading
(only applicable if O2 sensor is tted).

CO Air-free = (20.9 x CO) / ( 20.9 – O2).

The typical display for this
mode is shown opposite, in

Fig. 7.5:

A sample is considered
invalid until the Oxygen (O2)
concentration is below 19%
Vol.

Changes to Fig 7.6 when valid

sample is taken.

7.4.4 CO Viewing

This option allows the user to view the six (6) most recent manually
logged readings.

If this mode is enabled, a
results screen will be
displayed, as shown in Fig.

7.7, when entering any of the

other three modes.

Fig. 7.5 Air-Free CO

Fig. 7.6 Valid Sample

Fig. 7.7 CO Viewing Display

Note 1: The display briey ickers each time that a timed log is

captured (normally every minute).

7-4

CO (CARBON MONOXIDE MODE)USER HANDBOOK

Note 2: A proper ‘DIF’ reading will only be obtained if there is a

preceding DIFZ (zeroing).

Note 3: Before viewing logs from the differential mode, a manual

‘zero’ must be performed as a reference point. If this has
not been done, since the last clear, a ‘zzz’ fault indication
will result.

If this option is enabled, the viewing display (Fig. 7.7) will be shown

before either CO Direct, Differential CO or Air Free CO.

Once viewed, the user can view the actual CO reading as per mode
previously selected.

To view actual CO reading:

• Press and hold OK .

Note: If CO Viewing is selected from the CO menu

(Fig. 7.1), the display has no OK option.

To exit from this option:

• Press and hold LH and RH buttons together.

To CLEAR (remove) existing readings from the display:

• Press and hold CLEAR .

Note: The values are stored in the datalogging memory for

future reference.

7-5

7.5 CO BUTTON OPERATION

LH

(INVERT)

RH

(PUMP)

CENTRE

(RANGE)

ACTION

PRESS

INVERT

DISPLAY

MANUAL

LOG

CLEAR

VIEWING

OK (CONTINUE)

VIEWING

BACKLIGHT /
FLASHLIGHT

PUMP

ON / OFF

CLEAR FLOW

FAULT

ZERO

PRESS

and

HOLD

A summary of the button operation is detailed in table 7.1:

Table. 7.1 Button Operation in CO Mode

7.6 DESCRIPTION OF CO BUTTON OPERATION

7.6.1 Lights

To switch ON the backlight:

• Press and hold the Centre button .

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after two

minutes. Both can be switched OFF by a third press and hold of the

Centre button .

7.6.2 Manual Zero

Only available in differential CO mode.

To zero differential CO:

• Press and hold ZERO .

7-6

CO (CARBON MONOXIDE MODE)USER HANDBOOK

7.6.3 Manual Log

A manual log can be taken at any time provided that the pump is
running.

To capture a manual log:

• Press and hold LOG .

Note: When a manual log is taken, the term ‘LOG’ is inversed on

the display for one (1) second to provide a visual conrmation

that the log has been captured.

7.6.4 Flow Fault

If ow fault is detected, the pump stops automatically. The instrument

should be checked for water ingress or blockage.

To clear the ow fault:

(Once the blockage has been cleared):

• Press the RH button .

7.6.5 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and the RH button

.

While both buttons are depressed, the instrument display
will step through previous menus, each displayed for
approximately two (2) seconds.

When the menu appears on the screen, release the buttons,
otherwise the instrument will proceed into the switch
OFF process and will switch OFF after a further three (3)
seconds.

7-7

7.7 CO ALARMS

There are no alarms in this mode.

7.8 CO LOGGING

Automatic datalogging is active and manual logs can also be
captured. Timed logs will be taken every minute (default) or as

per conguration. For direct CO and differential CO, the direct CO

reading will be logged.

For the Air Free CO, the calculated reading will be stored.

A manual zero will also be stored.

7-8

PURGE MODE

The purge mode is used in gas and air purging applications.

8.1 PURGE RANGES

Purge mode will have the following ranges available:

• 0 – 100% VOL Methane (CH4) Flammable

• 0 – 25% Oxygen (O2) if tted

8.2 PURGE FEATURES

Purge mode has the following features available:

• Pump ON / OFF

• Manual zero

• Backlight

• Flashlight

• Display Invert

8.3 PURGE DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is indicated
by a flashing gas reading, as
illustrated in Fig. 8.1.

A negative zero fault is indicated
by a spanner alternating with
a zero reading (not illustrated).

alternating with

8

Fig. 8.1 Sensor Check

8-1

After the sensor check the

LH

(INVERT)

RH

(PUMP)

CENTRE

(RANGE)

ACTION

PRESS

INVERT
DISPLAY

RANGE

ZERO

BACKLIGHT /
FLASHLIGHT

PUMP

ON / OFF

CLEAR FLOW

FAULT

PRESS

and

HOLD

normal display will be shown,
as in Fig. 8.2:

Fig. 8.2 Normal Display

To display both % Gas and % O2:

(as shown in Fig. 8.3)

• Press the Centre

button

Fig. 8.3 Gas and Oxygen

Display

8.4 PURGE BUTTON OPERATION

A summary of the button operation is detailed in Table 8.1:

8-2

Table. 8.1 Button Operation in Purge Mode

PURGE MODEUSER HANDBOOK

8.5 DESCRIPTION OF PURGE BUTTON OPERATION

8.5.1 Lights

To switch ON the backlight:

• Press and hold the Centre button .

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after two

minutes. Both can be switched OFF by a third press and hold the

Centre button .

8.5.2 Pump

To switch the pump ON and OFF:

• Press the RH button .

8.5.3 Manual Zero

To zero the reading (in fresh air):

• Press and hold ZERO .

Note: Pump must be switched ON to zero reading.

8.5.4 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and RH button

When the menu appears on the screen, release the buttons,
otherwise the instrument will proceed into the switch OFF
process and will switch OFF after a further three (3) seconds.

8-3

8.5.5 Range

The range button allows the selection of the % Gas only display or
the % Gas plus % O2 display.

8.5.6 Flow Fault

If ow fault is detected, the pump stops automatically. The instrument

should be checked for water ingress or blockage.

To clear the ow fault:

(Once the blockage has been cleared)

• Press the RH button .

8.6 PURGE ALARMS

There are no alarms in this mode.

8-4

9

SNIFFER MODE

This mode is used to nd small tting leaks. Fast detection rates are

achieved using a semiconductor sensor in the probe.

9.1 SNIFFER RANGES

Sniffer mode will have the following ranges available:

• 0 – 10,000 ppm Methane (CH4) Flammable

9.2 SNIFFER FEATURES

Sniffer mode will have the following features:

• Audible / Visual Ticker (Geiger) indication

• Ticker (Geiger) back-off

• Manual zero

• Pump ON / OFF

• Display invert

• Backlight

• Flashlight

9-1

9.3 SNIFFER DISPLAYS

During the warm-up period,
all applicable sensors will be
checked and the display will
indicate any sensor faults.

A positive zero fault is indicated

by a ashing gas reading, as

illustrated in Fig. 9.1.

A negative zero fault
is indicated by a spanner
alternating with a zero reading
(not illustrated).

To zero the reading (in fresh air)

• Press and hold ZERO .

Note: Pump must be switched ON to zero reading.

After the sensors have been
checked, the normal display
will be as shown in Fig. 9.2:

alternating with

Fig. 9.1 Sensor Check

Fig. 9.2 Normal Display

9-2

SNIFFER MODEUSER HANDBOOK

LH

(INVERT)

RH

(PUMP)

CENTRE
(RANGE)

ACTION

PRESS

INVERT
DISPLAY

BACKLIGHT /
FLASHLIGHT

PUMP

ON / OFF

CLEAR FLOW

FAULT

ZERO

PRESS

and

HOLD

9.4 SNIFFER BUTTON OPERATION

A summary of the button operation is detailed in Table 9.1:

Table 9.1 Button Operation in Sniffer Mode

9.5 DESCRIPTION OF SNIFFER BUTTON OPERATION

9.5.1 Lights

To switch ON the backlight:

• Press and hold the Centre button .

To switch ON the ashlight:

• Press and hold the Centre button again.

The backlight and ashlight are both timed to switch OFF after two

minutes. Both can be switched OFF by a third press and hold the

Centre button .

9.5.2 Pump

To switch pump ON and OFF:

• Press the RH button .

9-3

9.5.3 Zero

To zero the ppm range

• Press and hold the RH button .

Note: The pump must be switched ON to zero the ppm range.

9.5.4 Flow Fault

If ow fault is detected, the pump stops automatically. The instrument

should be checked for water ingress or blockage.

To clear the ow fault:

(Once the blockage has been cleared):

• Press the RH button .

9.5.5 Ticker (Geiger) On / Off

To enable / disable the Geiger (Ticker):

• Press and hold the UP and DOWN buttons

simultaneously, as follows:

1. Press and hold - to enable visual only.

2. Press and hold again - to disable both audible and visual.

3. Press and hold again - to enable both audible and visual.

9.5.6 Ticker (Geiger) Adjust

To adjust the Ticker (Geiger) threshold:

(after the Ticker (Geiger) feature has been enabled)

• Press the UP or DOWN buttons.

The threshold setting is displayed briey beneath the PPM CH4.

9-4

SNIFFER MODEUSER HANDBOOK

9.5.7 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and RH button .

When the menu appears on the screen, release the buttons,

otherwise the instrument will proceed into the switch OFF
process and will switch OFF after a further three (3) seconds.

9.6 SNIFFER TICKER (GEIGER) INDICATION

The Ticker (Geiger) range at start up is 0-1000 ppm.

For any subsequent PPM concentration, the Ticker (Geiger) audible

/ visual can be “zeroed” with the DOWN button , e.g. 600ppm

Ticker (Geiger) can be ‘backed off’ with the DOWN button , for

example, 600 ppm Ticker (Geiger) can be ‘backed off’ to enable
tracing to higher concentrations, in which case the Ticker (Geiger)
range becomes 600-1600 ppm etc, etc.

Note: The display range always remains as 0-10,000ppm.

The Ticker (Geiger) visual is such that the LED’s illuminate in pairs,
according to the table (Fig. 9.3), over any 1000 ppm range as
explained above.

9-5

9.6.1 Select Audible / Visual Ticker (Geiger)

Red LED's - Pair 1

Red LED's

PPM Level

Pair 7

Pair 6

Pair 5

Pair 4

Pair 3

Pair 2

Pair 1 100

Pair 8

Pair 2 200

Pair 3 300

Pair 4 400

Red LED's

PPM Level

Pair 5 500

Pair 6 600

Pair 7 700

Pair 8

800 - 1000

Combination Option

The Ticker (Geiger) function can be set for audible and visual
combination options as follows: Both ON; Audible OFF / Visual ON;
Both OFF; Both ON; etc.

To select required audible / visual combination option:

• Press and hold both UP and DOWN buttons.

• Repeat operation to cycle through combination options.

Fig. 9.3 Ticker (Geiger) LED Illumination

9-6

10

PRESSURE MODE

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

Note 1: It is important to zero the pressure mode in ambient
atmosphere before taking measurements.

Note 2: Pump is OFF in pressure mode.

10.1 PRESSURE RANGES

Pressure mode will have either of the following congurable ranges

available:

• 0 to 60in Water Gauge (Resolution 0.1in)

• 0 to 150mBar (Resolution 1mBar)

Note: EEE (Over-range) is displayed if the pressure exceeds

60in. / 150mBar.

10.2 PRESSURE FEATURES

Pressure mode will have the following features available:

• Backlight

• Display Invert

10.3 PRESSURE DISPLAYS

When pressure test mode is
selected from the menu, the
normal operating display is
shown. See Fig. 10.1.

Fig. 10.1 Normal Display

10-1

Note: A congurable option is

available to measure in mBar
as shown in Fig. 10.2.

Fig. 10.2 mBar Display

10.4 PREPARE INSTRUMENT (PRESSURE MODE)

Zero the instrument before tubing is attached.

To zero the instrument:

• Press and hold ZERO .

Connect the required length of tubing from the appliance to the
pressure port on the rear of the instrument, as shown in Fig. 10.3.

Fig. 10.3 Tubing Connected to Pressure Port

You can now utilise the instrument as a manometer in accordance

with your company practice.

10-2

LH

(INVERT)

RH

(PUMP)

CENTRE
(RANGE)

ACTION

PRESS

BACKLIGHT

INVERT

DISPLAY

ZERO

PRESS

and

HOLD

PRESSURE MODEUSER HANDBOOK

10.5 PRESSURE BUTTON OPERATION

A summary of the button operation is detailed in Table 10.1:

Table. 10.1 Button Operation in Pressure Mode

10.6 DESCRIPTION OF PRESSURE BUTTON OPERATION

10.6.1 Lights

To switch ON the backlight:

• Press and hold the Centre button .

The backlighting is timed to switch OFF after two minutes, or
alternatively, it can be switched OFF by a further press and hold the

Centre button .

10.6.2 Zero

To zero the instrument:

(before tubing is attached)

• Press and hold the RH button .

10-3

10.6.3 Menu / Off

To re-select the Mode Menu:

• Press and hold both the LH button and RH button .

When menu appears on the screen, release the buttons,

otherwise the instrument will proceed into the switch
OFF process and will switch OFF after a further three (3)
seconds.

10.7 PRESSURE ALARMS

There are no alarms in this mode.

10-4

11

BUMP TEST MODE

This mode is to allow the user to periodically test the instrument
against known gas concentrations. This mode is disabled by default.

11.1 BUMP TEST RANGES

All the gas ranges that are present in the GT are available in this
mode:

• 0-10000 ppm Methane (CH4) Flammable

• 0-100 % LEL Methane (CH4) Flammable

• 0-100 % VOL Methane (CH4) Flammable

• 0-25 % Oxygen (O2) if tted

• 0-2000 ppm Carbon Monoxide (CO) if tted

• 0-100 ppm Hydrogen Sulphide (H2S) if tted

11.2 BUMP TEST FEATURES

If enabled, Bump Test mode will have the following features available:

• Set-up of gases according to gas cylinder values.

• Five (5) Cal gases can be dened.

• Date stored when gas set-up changed.

• Peak values stored for applied gases.

• Ability to view details of previous 32 bump tests, including

time and date.

11-1

11.3 BUMP TEST DISPLAYS

On entering bump test mode,

the rst screen is shown:

Each gas type / concentration
is stored using a CalGas
number, e.g. PPM may be
stored as CalGas 1; LEL as
CalGas 2; etc.

The CalGas selection number is highlighted. A different gas type
(number) can be selected.

To select a different calgas number:

• Press the UP or DOWN buttons as necessary.

In the example shown in Fig.
11-2, CalGas 2 is selected
and has a 50% LEL value
previously stored.

The concentration of a gas
range can be entered / edited
to suit the gas value shown
on the calibration gas bottle
to be used.

To enter / edit the gas range concentration:

• Press and hold NEXT

to highlight the

gas value, if previously
stored. Refer to Fig.
11-3. (50% LEL in
example).

Fig. 11-1 CalGas Selection

Fig. 11-2 Enter / View CalGas

Value

Fig. 11-3 Enter / Edit CalGas

Value

11-2

BUMP TEST MODEUSER HANDBOOK

• Press the UP or DOWN buttons as necessary to

enter / edit value.

Note 1: As soon as either the UP or DOWN buttons are touched

and when there is no value displayed, a value one unit away
from the GMI default value, is automatically displayed. This
assists the user to enter the required gas concentration
more quickly.

Note 2: Pressing and holding either of the buttons will perform a

fast ramped increase / decrease in value.

At this point, the user can accept the highlighted value and apply the

gas, or alternatively, continue dening the other gases.

To accept the highlighted gas range concentration value:

• Press and hold OK .

If OK was selected, then the
screen, shown opposite, is
displayed:

On the left, the gas ranges
are displayed. In the middle
column, the target for the
applicable ranges are
displayed and on the right,
the (applied gas) peak value.

Gas range values that were
not entered in the applied CalGas will display the peak value as a

dash (-).

Apply the gas manually, using a balanced ow regulator.

Once the peak reading is high enough, or stabilised, disconnect the
gas. At this point the user can EXIT and all values will be stored

automatically, or go back to the CalGas set-up to dene and apply

another gas.

Fig. 11-4 Applied Gas Peak

Values

11-3

To exit current gas range and return to main menu:

• Press and hold EXIT .

To return to CalGas selection display:

• Press and hold OK .

From CalGas set-up screen,
Fig. 11-5, the user can also
view the previous 32 bump
tests.

Fig. 11-5 CalGas Display

To view the previous 32 bump tests:

• Press and hold LAST .

The screen, shown opposite,
is displayed:

Fig. 11-6 Previously Stored Bump

To highlight required bump test:

• Press the UP or DOWN buttons as necessary

to highlight date and time of test.

Tests

11-4

BUMP TEST MODEUSER HANDBOOK

LH

(INVERT)

RH

(PUMP)

CENTRE
(RANGE)

ACTION

PRESS

INVERT

DISPLAY

NEXT OK

EXIT

VIEW PREVIOUS

32 BUMP TESTS

PRESS

and

HOLD

To select highlighted option:

• Press and hold NEXT .

The screen, shown opposite,
displays the previously stored
bump test data:

Fig. 11-7 Stored Bump Test Data

To return to CalGas Display:

• Press and hold OK .

11.4 BUMP TEST BUTTON OPERATION

A summary of the button operation is detailed in Table 11.1.

Table 11.1 Button Operation in Bump Test Mode

11-5

11.5 BUMP TEST LOGGING

All bump tests performed will be automatically stored in the
datalogging memory if the mode is exited via the EXIT (Centre) button.

Up to 32 different bump tests are stored in chronological order. If any
more are done, the oldest will be over-written.

The data can be extracted from the GT using the GT Data
Downloading software package (GMI Part no. 67164).

11-6

12

ALARMS

12.1 GAS ALARMS

The following gas alarms are available according to gas type and are
programmable according to application and / or customer preference.
(See Tables 12.1 and 12.2).

12.2 FLAMMABLE (LEL) ALARMS

Up to three (3) instantaneous alarm levels are programmable. All

three are rising alarms, i.e. if the concentration is above the specic

alarm level, the alarm is triggered.

12.3 OXYGEN (O2) ALARMS

Up to three (3) instantaneous alarm levels are programmable, one (1)
rising and two (2) falling (to trigger alarms in O2 decient scenarios).

12.4 TOXIC GAS (e.g. CO) ALARMS

When operating normally, the instrument records minimum and
maximum readings for each gas. It also calculates the Short Term
Exposure Limit (STEL) and Long Term Exposure Limit (LTEL), known
as Time Weighed Average (TWA) readings, for each toxic gas range
as appropriate. Up to two (2) instantaneous rising and two (2) TWA

alarms are programmable for each toxic range tted to the instrument.

Note: A Time Weighted Average (TWA) value is the mean average

gas level over a specic period. The STEL is 15 minutes

and the LTEL is 8 hours. In accordance with legislation, this
requires the time weighted averages to be averaged over
a full period whether the instrument is ON or OFF. Such

12-1

averaging essentially makes the instrument single user
applicable. The option is available to restart the averaging
after each instrument switch-off, thus allowing for multiple
user application.

A TWA alarm is intermittent with the actual gas reading,

therefore it is possible to get a value of zero (0) and an LTEL
or STEL alarm.

All alarms are user congurable to meet the specic needs of

different companies.

Note: The gas alarm levels, instantaneous STEL and LTEL, are

set at the time of instrument manufacture. It is important that
the user ensures that the levels are in accordance with their
company’s alarm levels and with health and safety legislation.
The alarm levels may be changed, if required, as detailed in
the ‘SET-UP SOFTWARE USER HANDBOOK’.

Example 1:

In the following examples,
example 1 (Fig. 12.1) shows
an instrument in confined
space mode signalling a
‘LOLO’ Oxygen alarm. The
audible alarm warbles and the
red LED’s ramp.

Toggles to

12-2

Fig. 12.1 LOLO Oxygen Alarm

Example 2 (Fig. 12.2) shows
the instrument signalling a

‘HIHI’ LEL alarm. Again

the alarm warbles and all
eight (8) LED’s ramp. If more
than one gas alarm level is
exceeded, the gas value will

ash for each type in alarm.

Example 3 (Fig. 12.3) shows
an instrument in Leak
Test Mode with a Carbon
Monoxide warning alarm.
There is no audible alarm and
the LED’s do not ramp. The
gas range (ppm CO in this

example) will ash.

ALARMSUSER HANDBOOK

Example 2:

Toggles to

Fig. 12.2 HIHI LEL Alarm

Example 3:

Toggles to

Fig. 12.3 CO Warning Alarm

12-3

Example 4 (Fig. 12.4) shows
an instrument in Leak Test

Mode with a ‘HI’ LEL alarm.
The audible alarm indication is
a high pitch tone together with

four ashing LED’s.

Example 5 (Fig. 12.5) shows
an instrument in Confined

Space Mode with a ‘LO’ O2
alarm. The audible alarm
indication is a high pitch tone
together with four flashing
LED’s.

Example 4:

Toggles to

Fig. 12.4 HI LEL Alarm

Example 5:

Toggles to

12-4

Fig. 12.5 LO O2 Alarm

Examples 6 and 7 (Fig. 12.6
and Fig. 12.7) shows an
instrument in Conned Space

Mode with Time Weighted
Average STEL and LTEL H2S
alarms for toxic sensors. In
both cases, the audible alarm
warbles and eight (8) LED’s
ramp.

ALARMSUSER HANDBOOK

Example 6:

Toggles to

ACTUAL GAS READING

Fig. 12.6 STEL H2S Alarm

Example 7:

Toggles to

ACTUAL GAS READING

Fig. 12.7 LTEL H2S Alarm

12-5

12.5 ALARM TYPES

12.5.1 Latching / Non Latching

Each alarm can be latching or non latching. Latching alarms must
be, and can only be cleared by the user when the gas level returns
to within the alarm limits.

Non-latching alarms clear automatically when the gas level returns
to within the preset alarm limits.

12.5.2 Muting / Acknowledging

Muting:

Muting of an alarm is achieved by a press and hold of the

LH button.

Muting means that the audible alarm will cancel for 60

seconds, after which if the gas concentration is still above
the set level (or below for Oxygen) the alarm will reactivate.

Acknowledging:

Only applicable to latching alarms. The audible/visual alarms

can only be cancelled after the atmosphere has returned to
safe concentrations.

The following Table 12.1 shows the GMI default selections. Latching
or non-latching options exist in all allowable alarms.

Alarms are allowed in Leak Test Mode and CSM Mode only.

Any single alarm e.g. LEL HI, Toxic Warning etc., can only have one
alarm concentration level and either latching/non latching and mute
or non mute and the output , i.e. LO Pitch / HI Pitch with LED’s

ashing/ramping are preset according to the following Table 12.1.

This means that if a CO HIHI Alarm is set at 35ppm and latching
and non-muting is selected for leak and/or CSM. The level will be the
same in each mode and the type, e.g. latching, will also be common.

If the alarm is disabled, it will not function in any mode.

12-6

ALARMSUSER HANDBOOK

ALARM TYPE LATCHING

Yes / No

MUTE

Yes / No

AUDIBLE

INDICATION

VISUAL LED

INDICATION

DISPLAY

LEL Warning NN / AN / AN / A Flash Range

LEL (

HI

)NY

High Pitch

Tone

(4) Flashing

Toggle

Hi / Conc

LEL (

HIHI

)YN

High Pitch

Warble

(8) Ramping

Toggle

Hi Hi / Conc

O

2

(LO)

NY

High Pitch

Tone

(4) Flashing

Toggle

Lo / Conc

O

2

(

LOLO

)YN

High Pitch

Warble

(8) Ramping

Toggle

Lo Lo / Conc

O

2

(

HIHI

)YN

High Pitch

Warble

(8) Ramping

Toggle

Hi Hi / Conc

H

2

S Warning NN / AN / AN / A Flash Range

H

2

S (

HIHI

)YN

High Pitch

Warble

(8) Ramping

Toggle

Hi Hi / Conc

H

2

S (STEL) YN

High Pitch

Warble

(8) Ramping

Toggle

STEL / Conc

H

2

S (LTEL / TWA) YN

High Pitch

Warble

(8) Ramping

Toggle

LTEL / Conc

CO Warning NN / AN / AN / A Flash Range

CO (

HIHI

)YN

High Pitch

Warble

(8) Ramping

Toggle

Hi Hi / Conc

CO (STEL) YN

High Pitch

Warble

(8) Ramping

Toggle

STEL / Conc

CO (LTEL / TWA) YN

High Pitch

Warble

(8) Ramping

Toggle

LTEL / Conc

LO

YN / A

Low Pitch

Tone

Fault LED

Flashing

Fault 'Term'

Low Battery YN / A

Low Pitch

Tone

Fault LED

On

Fault 'Term'

Zero Fault YN / A

Low Pitch

Tone

Fault LED

Flashing

Sensor Fault YN / A

Low Pitch

Tone

Fault LED

Flashing

Flow Fault YN / A

Low Pitch

Tone

Fault LED

Flashing

Calibration
Expired

YN / A

Low Pitch

Tone

Fault LED

Flashing

Service Expired YN / A

Low Pitch

Tone

Fault LED

Flashing

Fault 'Term'

Fault 'Term'

Fault 'Term'

Fault 'Term'

Fault 'Term'

Table. 12.1 Alarm Indication

12-7

The following Table 12.2 shows the alarm options available in the

LEAK TEST CSM

FLAM CO H2S O2 FLAM CO H2S O2

WARNING

20

Hi

Hi Hi 20 35 15 23

STEL 200 10

LTEL 30 5

Lo

Lo Lo

19.5

Leak Test and Conned Space Modes.

Table. 12.2 Alarm Options

Note:

1. Where there is a square with a number, it means that the GMI
default is to have these alarms active at the gas concentration
shown by the number.

2. Where there is a square without a number, it means that
this alarm option is available should the user wish to have it
activated.

3. The alarm concentrations must, if active, be the same level
in both modes.

12-8

ALARMSUSER HANDBOOK

12.6 FAULT ALARMS

Refer to Alarms Table 12.1 to identify the audible / visual indication
for any of the following faults.

12.6.1 Low Battery

The battery symbol is displayed on the screen intermittently
with LO. When the instrument’s battery power is low, i.e.
approximately 30 minutes operating time remaining, the audible

alarm sounds once every two seconds and the Orange LED ashes.

Recharge the battery or replace the alkaline batteries if using alkaline
batteries.

The Low Battery ag ashes when approximately three (3)

minutes operating time remains. The audible alarm sounds once
every second and the Orange LED illuminates constantly. After three
(3) minutes the instrument automatically switches off.

Note: Both audible and visual gas alarms continue to operate after

the low battery warning message appears.

12.6.2 Zero Fault

A “ZERO FAULT” ag and a ashing spanner symbol appear after

warm-up and after entering a mode if the instrument is switched on
in the presence of gas or the instrument has been unable to zero
all sensors correctly.

The audible alarm sounds, and the orange fault LED ashes. If the

user is in a mode where the faulty sensor is used the orange LED
is on, continuously.

It is strongly recommended the instrument is returned to a gas free
area. Switch the instrument off and then switch on again in clean air.
If the fault persists, return the instrument for service.

The instrument can however still be used to detect and alarm on the

other sensor(s) tted.

12-9

The faulty sensor will cause
the instrument to display a
flashing spanner symbol to
warn the user that this sensor
is not working correctly, as
shown in Fig. 12.8:

alternating with

Fig. 12.8 Zero Fault

12.6.3 Sensor Fault

There are two types of sensor fault as illustrated in the following
displays:

1) If a “ZERO FAULT”
flag and a flashing
spanner symbol
appear, alternating
with a zero reading
as shown in Fig. 12.9,
apply relevant test
gas (LEL in example)
for two minutes and
allow the display to
return to zero, then
switch instrument Off
and On again.

If fault remains,

return instrument to
an approved Service
/ Repair facility.

alternating with

Fig. 12.9 Sensor Fault

12-10

2) If a “ZERO FAULT”
flag and a flashing
spanner symbol
appear, alternating
with a gas value as
shown in Fig. 12.10,
leave instrument
on for 30 to 60
minutes then switch
instrument Off and
On again.

If fault remains,

return instrument to
an approved Service
/ Repair facility.

12.6.4 Sample / Flow Fault

If a ‘FLOW FAULT’ flag
appears, alternating with
mode as shown in Fig. 12.11,

a ‘ow fault’ exists. The pump

symbol will be extinguished
(except in Confined Space
mode). The fault LED will
also be ON.

Check sample line, sample

lter or probe for blockage,

if applicable. Clear blockage
then restart the pump.

ALARMSUSER HANDBOOK

alternating with

Fig. 12.10 Sensor Fault

alternating with

Fig. 12.11 Sample / Flow Fault

12-11

To clear the ow fault:

• Press the RH button .

or

• Press and hold FLOW ACK .

(in Conned Space Mode only)

Note: In Conned Space mode, the pump will not switch off if a

sample fault exists.

12.6.5 Calibration Expired

During the warm up of the instrument, a check is done to verify if

the calibration date has expired. If the instrument is congured to

pause if calibration is due, the user is asked to continue or not. If yes
is selected, the user can continue using the instrument as normal.
If no is selected, the user is forced to switch the instrument off and
return the instrument for calibration. The calibration due date is only
displayed during the warm up of the instrument and there will be no
indication during normal operation.

12.6.6 Calibration Required

During warm-up, if the
‘CALIBRATION REQUIRED’
flag is displayed and an
audible alarm and Red LED’s
are activated, the instrument
has detected a fault in the
calibration memory during
start-up and is unable to
continue without re-calibration.

The instrument must be switched off immediately. Follow appropriate
action required by your company for calibration.

An extended period is possible, allowing the user to continue to
use the instrument for a set amount of time after the calibration has
expired. When this extended period is over, the user will be forced
to switch off the instrument and return the instrument for calibration.

Fig. 12.12 Calibration Required

12-12