GMI GT series Instruction Manual

1
Configuration &
Field Calibration
Handbook

2
CONFIGURATION & FIELD CALIBRATION
Issue 1
17/09/05
Part Number: 67160
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Copyright © Gas Measurement Instruments Ltd 2005

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COPYRIGHT
COPYRIGHT
This User Handbook is copyright of Gas Measurement Instruments Ltd (GMI) and
the information contained within, is for use on y with GT series instruments.
Reproduction, in who e or in part, inc uding uti isation in machines capab e of
reproduction or retrieva 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 responsibi ity 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 aw are not affected.
MODIFICATION NOTICES
GMI aim to notify customers of re evant changes in the product operation and maintain
this manua up to date. In view of the po icy of continuous product improvement there
may be operationa differences between the atest product and this manua .
This Handbook is an important part of the GT series product. P ease note the
fo owing points:
 It shou d be kept with the instrument for the ife of the product.
 Amendments shou d be attached.
 This Handbook shou d be passed on to any subsequent owner/user of the
instrument.
 A though every care is taken in the preparation of this Handbook it does not
constitute a specification for the instrument.
SOFTWARE
Software supp ied on EPROM or simi ar device for use in a particu ar product, may
on y be used in that product and may not be copied without the written permission of
Gas Measurement Instruments Ltd. Reproduction or disassemb y of such embodied
programmes or a gorithms is prohibited. Ownership of such software is not
transferab e and GMI Ltd does not warrant that the operation of the software wi be
error free or that the software wi meet the customers requirements.
DISPOSAL ADVICE
When no onger in use, dispose of the instrument carefu y and with respect for the
environment. GMI wi dispose of the instrument without charge if returned to the
factory.

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CONFIGURATION & FIELD CALIBRATION

iii
REVISION RECORD
Date Issue Description Of
Change
17/09/2005 1 New Handbook

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CONFIGURATION & FIELD CALIBRATION

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CONTENTS
CONTENTS
COPYRIGHT ................................................................... i
LIA ILITY ....................................................................... i
MODIFICATION NOTICES ................................................ i
SOFTWARE ................................................................... i
DISPOSAL ADVICE ........................................................ i
REVISION RECORD ....................................... v
INTRODUCTION ............................................. 1
SWITCH INSTRUMENT ON / OFF ................. 3
1.1 INSTRUMENT IDENTIFICATION ............................. 4
1.2 ATTERY STATUS .............................................. 5
1.3 TIME AND DATE ................................................... 5
1.4 CALI RATION DUE DATE .................................... 6
1.5 SERVICE DUE DATE .......................................... 12
1.6 SWITCH THE INSTRUMENT OFF ....................... 18
FIELD CALIBRATION ................................... 21
2.1 SWITCH THE INSTRUMENT ON ......................... 22
2.2 ENTER CALI RATION MENU ............................. 24

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CONFIGURATION & FIELD CALIBRATION
2.3 ZERO ALL RANGES .......................................... 26
2.4 CALI RATE ....................................................... 27
2.5 ACCEPT CALI RATION ..................................... 31
2.6 NEXT CALI RATION DUE .................................. 33
ALARM CONFIGURATION ........................... 35
3.1 SWITCH THE INSTRUMENT ON ......................... 36
3.2 ENTER ALARMS MENU ..................................... 38
3.3 ALARM OPTIONS .............................................. 42
3.3.3 Mute ................................................................ 43
3.4 LEL ALARMS ..................................................... 43
3.5 OXYGEN ALARMS ............................................ 45
3.6 TOXIC GAS ALARMS ........................................ 47
SET DEFAULTS ........................................... 53
4.1 SWITCH THE INSTRUMENT ON ......................... 54
4.2 ENTER DEFAULT MENU ..................................... 56
CLOCK CONFIGURATION ........................... 61
5.1 SWITCHING THE INSTRUMENT ON ................... 62
5.2 ENTER CLOCK MENU ........................................ 64
INDEX ............................................................. I

1
INTRODUCTION
This handbook allows Field Calibration (Chapter 2), Alarm
Configuration (Chapter 3), Set Defaults (Chapter 4) and
Clock Configuration (Chapter 5) to be carried out without
the use of additional equipment such as PCs or tools.

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CONFIGURATION & FIELD CALIBRATION
The instrument must be switched on in Menu mode, as
detailed in each of the procedures (Chapters 2 to 5).
A code must be entered before any of the instrument
settings can be altered.
To avoid repeating the warm up sequence in each
procedure, Chapter 1 details the Switch the instrument
ON / OFF operation.
The procedures, detailed in Chapters 2 to 5, show the
GMI factory default settings. When each screen is
accessed, the current setting is highlighted on the
instrument display.
These settings can be altered as detailed in the following
procedures (Chapters 2 to 5).
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
(PUMP) button. To select No, the LH (INVERT) 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, configuration and field calibration of this
instrument.

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1
SWITCH INSTRUMENT ON / OFF
To switch the instrument ON in fresh air:
 Press and hold the RH (PUMP ) button , for one
second.
Fig. 1.1 Switch ON
The instrument begins its 30 second warm-up routine
with a GT instrument type display, shown in Fig. 1.2.
(GT 42 instrument type shown in example).

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CONFIGURATION & FIELD CALIBRATION
During the warm-up cycle, a countdown timer appears in
the top right hand corner of the display.
The display backlight illuminates and remains ON during
warm-up.
When the warm-up cycle is complete, the screen light
automatically switches OFF.
Fig. 1.2 GT Model
1.1 INSTRUMENT IDENTIFIC TION
During the warm-up cycle, the instrument display identifies
the model, serial number, software version and battery
status information as shown in Fig. 1.3:
Fig. 1.3 Instrument Identification

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1.2 B TTERY ST TUS
This feature provides the user with a battery capacity
level indicator that displays instrument battery power
remaining, as shown in Fig. 1.4.
100%
75%
50%
25%
Fig. 1.4 attery 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.
1.3 TIME ND D TE
The time and date from the instruments built-in clock is
displayed on the screen during warm-up, as shown in
Fig. 1.5. If datalogging is being used, the time and date is
set from this clock. This may be important when viewing
the logged data.
Fig. 1.5 Time and Date
SWITCH INSTRUMENT ON / OFF

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CONFIGURATION & FIELD CALIBRATION
1.4 C LIBR TION DUE D TE
The CAL DUE date can be set by the workshop and is set
to 30 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.
2. Cal Due Date and overdue date messages are
displayed.
Calibration due date is displayed, as shown in Fig.
1.6.
Fig. 1.6 Calibration Due Date
The screen, shown in Fig. 1.7, is displayed when
the Calibration date has expired. i.e. overdue.
Fig. 1.7 Calibration Overdue

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After approximately five (5) 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.
1.8.
Fig. 1.8 Calibration Due Date
The screen, shown in Fig. 1.9, is displayed when
the Calibration date has expired. i.e. overdue.
Fig. 1.9 Calibration Overdue
The user must acknowledge that Calibration has
expired.
SWITCH INSTRUMENT ON / OFF

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CONFIGURATION & FIELD CALIBRATION
To continue:
 Press and hold YES , as indicated on the
bottom line of the display, and the instrument warm-
up continues.
To switch OFF:
 Press and hold NO as indicated on the bottom
line of the display. The screen shown in Fig. 1.10
is displayed.
Fig. 1.10 Switch OFF
 Press and hold both the LH (INVERT) button
and the RH (PUMP) button simultaneously to
proceed with the switch-off sequence.

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4. Cal Due Date message is displayed with user
acknowledge for e tended period option, if
overdue.
Calibration Due Date message is displayed, as
shown in Fig. 1.11.
Fig. 1.11 Calibration Due Date
If overdue but within the extended period, the
screen, shown in Fig. 1.12, is displayed.
Fig. 1.12 Calibration Overdue
The user must acknowledge that Calibration has
expired.
Note: The extended period can be set from 1 to
31 days
SWITCH INSTRUMENT ON / OFF

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CONFIGURATION & FIELD CALIBRATION
To accept extended period option:
 Press and hold YES , as indicated on the
bottom line of the display, 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 , as indicated on the bottom
line of the display. The screen shown in Fig. 1.13
is displayed.
Fig. 1.13 Switch OFF
 Press and hold both the LH (INVERT) button
and the RH (PUMP) button simultaneously to
proceed with the switch-off sequence.

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5. Cal Due Date message is displayed with user
shut-down if overdue.
Calibration due date is displayed, as shown in Fig.
1.14.
Fig. 1.14 Calibration Due Date
The screen, shown in Fig. 1.15, is displayed when
the Calibration date has expired. i.e. overdue.
Fig. 1.15 Switch OFF
To proceed with the switch-off sequence.
 Press and hold both the LH (INVERT) button
and the RH (PUMP) button simultaneously.
SWITCH INSTRUMENT ON / OFF

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CONFIGURATION & FIELD CALIBRATION
1.5 SERVICE DUE D TE
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 : y default, the service due date will not
normally be displayed at start up, but if
display option is selected, it will be shown
at 90 days prior to the preset date, as
shown in Fig. 1.16.
The SERVICE DUE feature has five (5) configurable
options:
1. Service Due Date message is not displayed
(Default).
2. Service Due Date and overdue date messages
are displayed, as shown in Fig. 1.16.
Fig. 1.16 Service Due Date
The screen, shown in Fig. 1.17, is displayed when
the Service date has expired. i.e. overdue.