Linde G-TECTA SG User manual

G‑TECTA® SG
Premium Single Gas
Detection Instrument
Operating Manual
UK

UK
Contents
Safety and Warning information 3
Instructions – specific for use
in hazardous areas 3, 4
Instructions – specific for use
in non‑hazardous areas 4
Introduction 5
Sensors 5
Key Features 5
Software 5
Batteries 5, 9
Product Features 6
Switching on 6
Auto Zero 6
Switching off 6
Instrument Storage 6
Confidence signals 7
Display Symbols 7
Alarms 8
Instrument Settings 8
Data and Event Logging 9
Wearing the Instruments 10
Gas Sampling 11
Maintenance, Calibration
and Gas Testing 11
Ozone Instrument 13
CO2 Instrument 13
Gas Test/Calibration Troubleshooting 14
PC Interface and PC Software 15
Product Specification 16
Accessories 17
Troubleshooting 18
Sensor Limitations 19
Available Sensors 19
Declaration of Conformity 20
The Linde Group Warranty 21
Whilst The Linde Group has made every effort
to ensure that the details and information given in
both our printed and online publications are accurate
at the time of issue, full technical specifications are
not necessarily included. Furthermore The Linde Group
policy is one of continuous improvement and the
right is reserved to alter details and information as
the need arises. Accordingly the Customer should
check any details and information they wish to rely
on with The Linde Group at the time of purchase.
The Linde Group can not accept liability in respect of any
errors or omissions herein contained or for any loss or
damage malfunction or consequential lost arising
from reliance upon our publication.
The customer will be responsible for any risk to health
or safety from goods in the Customer’s possession and/
or control. The Customer’s attention is drawn to the
fact that statutory regulations and recognised codes
of practice exist covering the use and handling of
some goods (including safety products.) The Customer
must ensure that persons who use the goods receive
adequate training and safety literature.
2

3
UK
2. The G-TECTA® SG may be used in Zones 1
and 2 for flammable versions and Zones 0,
1, and 2 for toxic and oxygen versions. Both
versions can be used for Group IIA, IIB, and IIC
gases and vapours for Temperature Classes T1,
T2, T3 and T4.
Flammable Gas
Baseefa09ATEX0240
Ex ia d IIC T4 Gb -4F/-20ºC ≤ ta ≤ 149F/65ºC
N694
The Linde Group, GU2 7XY, UK
1180 II 2G
www.g-tecta.com
G-TECTA
SG
™
BAR CODE IIIIIIIIII
IECEx BAS 09.0115
Oxygen or Toxic Gas
BAR CODE IIIIIIIIII
www.g-tecta.com
G-TECTA
SG
™
Baseefa09ATEX0244
Ex ia IIC T4 Ga -4F/-20ºC ≤ ta ≤ 149F/65ºC
The Linde Group, GU2 7XY, UK
N694 1180 II 1G
IECEx BAS 09.0116
Safety and Warning information
WARNING

Read and understand all
instructions in the operation section of this
operating manual before use.
WARNING

Do not substitute components
as this may impair intrinsic safety and invalidate
warranty.
WARNING

Observe all warnings and
instructions marked on the instrument and within
this operating manual.
WARNING

Observe site health and safety
procedures for gases being monitored and
evacuation procedures.
WARNING

Make sure you understand the
alarm warnings.
WARNING

If this product is not working
properly, read the operating manual or call
The Linde Group.
WARNING

The accuracy of G-TECTA® SG
instruments equipped with a toxic gas sensor
should be checked periodically with known
concentration calibration gas. Failure to check
accuracy can lead to inaccurate and potentially
dangerous readings. G-TECTA® SG instruments
equipped with an oxygen sensor should be
periodically calibrated in fresh air.
WARNING

Ensure maintenance and
calibrations are carried out in accordance with the
procedures in the operating manual.
WARNING

The equipment is not certified
for use in atmospheres containing more than 21%
oxygen.
WARNING

G-TECTA® SG portable gas
detectors have been designed for the detection
of either oxygen deficiencies or specific toxic gas
accumulations. An alarm condition indicates the
presence of a potentially life threatening hazard
and should be taken very seriously.
WARNING

Ensure only qualified service
personnel change sensors, batteries and operating
system.
WARNING

Only charge batteries in safe
(non-hazardous) areas.
Instructions – specific for use in
hazardous areas
The following instructions apply to
equipment covered by certificate numbers
Baseefa09ATEX0240 Flammable Gas
Baseefa09ATEX0244 Oxygen or Toxic Gas.
The following information covers all relevant points
listed in clause 1.0.6 of the Essential Health & Safety
Requirements of the ATEX directive.
1. The certification marking is as follows:

UK
4
3. The equipment is certified for use in ambient
temperatures in the range –20°C to +65°C
(-4 to +149 F). The equipment should not
be used outside these ranges. Toxic and
Oxygen sensors are not rated for continuous
operation at high temperatures greater than
40°C (104°F).
4. Compliance with Essential Health and
Safety Requirements has been assured by
compliance with EN60079-0:2004 + Amds 1
& 2, EN60079-1:2004 and EN60079-11:2006,
as certified by Baseefa. Compliance with gas
detection performance standards EN50054,
EN50057, EN61779-1 and EN50104 has been
certified by Lloyd’s Register. EMC compliance
to EN50270 has been certified by 3C Test Ltd.
5. Repair of this equipment and gas sensor
replacement shall be carried out by the
manufacturer or approved service centre in
accordance with the applicable code
of practice.
6. If the equipment is likely to come into contact
with aggressive substances, then it is the
responsibility of the user to take suitable
precautions that prevent it from being
adversely affected, thus ensuring that the
type of protection is not compromised.
7. The rechargeable battery must only be
charged in non-hazardous (safe) areas by
connection to the specified Linde charger.
Rechargeable batteries can only be replaced
by a Linde Group Authorised Service Centre.
8. Only the following CR2477 battery types are
approved for use in the battery compartment
of the non rechargeable product variants:
Panasonic, GP, Energiser and Maxell. Do
not use Duracell batteries. Batteries must
only be changed in a non-hazardous
(safe) area. Users can only change non
rechargeable batteries in G-TECTA®
SG instruments.
9. The equipment is not certified for use
in atmospheres containing more than
21% Oxygen.
Area Classifications
Zone 0: An area classified as Zone 0 will always
have ignitable concentrations of flammable
gases, vapours or liquids present under normal
operating conditions.
Zone 1: An area classified as Zone 1 is likely to
have ignitable concentrations of flammable
gases, vapours or liquids present under normal
operating conditions.
Zone 2: An area classified as Zone 2 is not likely
to have ignitable concentrations of flammable
gases, vapours or liquids present under normal
operating conditions.
Instructions – specific for use
in non-hazardous areas
G-TECTA® SG CO2 Personal Detector
The G-TECTA® SG CO2 personal detector uses an
infrared gas sensor for CO2 detection. This version
of G-TECTA® SG is not designed or certified for
use in hazardous areas, and the intrinsic safety
information for this instrument is not applicable.
Operation and maintenance of the G-TECTA® SG CO2
is essentially the same as for other G-TECTA® SG
instruments but with the following points to note.
CO2 is present in ambient air at a background
concentration of just under 400ppm (0.04%).
In any enclosed environment the ambient
CO2 concentration will increase as a result of
people or animals breathing and if the room is
poorly ventilated concentrations well in excess
of 1 000ppm (0.1%) can occur. CO2 levels in
the outdoor air will also be enhanced by any
emitted CO2 e.g. from vehicle exhausts or boiler
flues venting to atmosphere so it is normal to
see fluctuating levels of CO2 on the instrument
display whether indoors or outside.

5
UK
G-TECTA® SG Premium
Single Gas Detection Instrument
Introduction
G-TECTA® SG is a Premium Single Gas Detection
Instrument, designed to be carried or worn by
individuals working in potentially hazardous
environments. G-TECTA® SG is certified for use in
classified hazardous areas and monitors a single gas
by displaying a reading on the instrument screen.
Alarm warnings are transmitted by means of a loud
audible alarm, a bright visual alarm of blue/red
flashing LEDs and an internal vibrating alarm.
Sensors
G-TECTA® SG can be specified with a wide
range of intelligent gas sensors. The sensor
is fitted to an intelligent processor which
contains calibration and sensor information.
The G-TECTA® SG can be reconfigured at any time by
replacing the pre-calibrated intelligent sensor with
an alternative gas type. Sensors should be replaced
by trained service personnel and are easy to fit
using “plug and play” technology. The intelligent
sensor is immediately recognised by
the instrument and is ready to use after
instrument calibration.
Key Features
G-TECTA® SG has been designed to be a reliable
and robust personal monitoring system, whilst
being small, light and easy to use. The instrument
is water and dust tight to IP65 and IP67 ratings. The
G-TECTA® SG’s shape and design ensures high levels
of user comfort and minimal interference with the
user’s normal work function. The non-slip grip and
alligator clip ensure secure handling and wear
ability and additional accessories such as shoulder
straps and chest harness allow flexible wearing
options if desired.
The G-TECTA® SG has a single mode button and a
high quality display with automatic backlight. The
instrument continuously monitors the gas level in
the environment providing current, peak, and time
weighted average (TWA) readings for the user.
The G-TECTA® SG can be configured by utilising
Linde G-TECTA® PC software. Data and event
logging can also be downloaded and managed
whilst the instrument is being charged via the
optional charger with communication link.
Software
The instrument software has been written in
accordance with IEC 61508 to ensure quality and
integrity in operation. The internal circuitry monitors
for any malfunction and will display an error
warning to the user in the unlikely event they occur.
Batteries
G-TECTA® SG is battery operated and is available
with the option of rechargeable batteries or
replaceable alkaline batteries*
Battery Check
The G-TECTA® SG has two battery options: Li-ion
rechargeable or non-rechargeable batteries.
Rechargeable Units
G-TECTA® SG uses a Li-ion battery pack and should
arrive with sufficient charge so that the unit can be
used straight out the box. However, to attain the
full operating time you should charge the battery.
(The actual operating time will depend on the types
of sensor installed.) The flammable G-TECTA® SG
will operate for at least 12 hours on a fully
charged battery.
WARNING

Rechargeable units
Only recharge the battery in a safe (non-hazardous)
area with a Linde G-TECTA® SG charger. Failure to
comply could invalidate safety certification and may
result in permanent damage to the instrument.
WARNING

Non-rechargeable Units
G-TECTA® SG uses a CR2477 battery. To maintain
compliance with instrument certification, ensure
only the following battery types are used:
Panasonic, GP, Energiser, and Maxell.
* LEL sensor instruments are not available
with alkaline batteries

6UK
G-TECTA® SG – Product Features
Operation
Switching On
The G-TECTA® SG is designed to be very easy to
operate. Please follow these simple steps to ensure
your instrument is ready for use:
Step 1
WARNING

Ensure the instrument is in
clean air.
Step 2
Press and hold the mode button for approximately
3 seconds until the red LED flashes on the
instrument. The display screen will light up and
the instrument will begin its start up sequence.
G-TECTA® SG Start-Up Sequence
The instrument will test the alarm LEDs, the alarm
sounder, the vibration alarms and the display
screen. The sounder may be silenced by pressing
the mode button once.
The instrument will continue through a start
up sequence as shown below, this will take
approximately 20 seconds.
Note: During the start up sequence, check the
battery status symbol to ensure you have enough
battery charge to use the instrument.
Calibration Check
If the instrument is due for calibration in less than
31 days “CAL xx” will be displayed, where xx is
the number of days to the next calibration. When
the date has expired, G-TECTA® SG will display the
warning message “CAL”.
When “CAL” is displayed the instrument can
still function as a standard feature, although we
strongly recommend that the instrument is sent
for calibration as soon as possible. Press the mode
button to continue to normal operating mode.
Note: G-TECTA® SG can be set to lock in the event of
the CAL date expiring by using G-TECTA® PC software.
Auto Zero
The Auto Zero function is enabled as a default
setting*. During start-up, the instrument will display
the Auto Zero confirm screen and the display will
alternate between “Zero” and “????”. Press the
mode button to activate the Auto Zero function.
Note: The instrument will time out in 10 seconds then
change to normal operating mode, without performing
an auto zero, if the mode button is not pressed.
Switching Off
Press and hold the mode button for 5 seconds,
the display will count down until the display shows
OFF. If you release the mode button during the
countdown, the G-TECTA® SG will return to normal
operating mode.
* The Auto Zero setting can be configured to operate
automatically, on user confirmation (default), or disabled,
using G-TECTA® PC software (see page 15).
OK
vv/v
ppm
ppb
0.0
ppm
OK
OK
ppm
Autozero confirm
OK
No Autozero
Mode
Button
Gas Name
Gas
Sensor
Sounder
Outlet
Alarm
LEDs
Display
Screen

7
UK
Instrument Storage
In order to optimise sensor performance and lifetime,
your G-TECTA® SG instrument should be stored in a
safe, non-hazardous area. The area should be clean
and dry, between temperature ranges 0-30°C, and at
a humidity level of 20-90%RH.
Normal Operation and Confidence Signals
The gas reading is displayed from the sensor
channel in the G-TECTA® SG instrument.
The screen will display the current level of gas, the
unit of measurement and the battery status. The
“ok” symbol will flash, indicating the instrument is
operating correctly.
Always check the gas type being monitored by your
instrument and ensure you have been trained on
your site health and safety procedures.
Confidence Signals
To give you added confidence the instrument is
operating correctly, the G-TECTA® SG will (every 10
seconds):
1. Sound a short beep
2. Flash a blue LED
In addition the “ok” icon will flash on the display
Display Symbols
Battery
When the battery is fully charged, the battery icon
will show 3 black bars. When the battery is empty,
the battery icon flashes and the instrument will
sound warning beeps.
WARNING

When the battery charge is
completely empty, G-TECTA® SG will switch
off automatically.
TWA Alarm
The TWA alarm for toxic gases will operate when
the short-term (15 minute) or long-term (8 hour)
time weighted average alarm levels are exceeded.
The G-TECTA® SG will display “SWTA” (15 minutes)
or “LTWA” (8 hours).
WARNING

TWA alarms cannot be
cleared. TWA alarms are functional for toxic gas
instruments only.
Display Menu Options
The G-TECTA® SG menu is displayed when you press
the mode button twice. There are up to 4 menu
options. To scroll between the different options,
press the mode button once. To select the menu
option you require, double click on the selected
icon. When the Peak and TWA menu options are
selected the relevant icon will be displayed on
the screen.
Peak
The Peak menu option displays the highest gas
level for flammable and toxic gases, or the lowest
level of oxygen, since the instrument was switched
on or was last reset.
The Peak feature is mainly used for confined space
entry checks, where the instrument is lowered into
a potentially hazardous environment (instead of
using a sampling tube), and also for viewing peak
gas exposure at the end of a shift.
TWA
The TWA menu option alternatively displays the 15
minute and 8 hour time weighted average reading
for toxic gases since the unit was switched on.
Peak Reset
The Peak Reset menu option clears the current
peak value in the instrument. The Peak value
should be cleared before any confined space
entry tests are performed.
Zero
The Zero menu option will reset the sensor in the
instrument. When the zero function has been
completed, the instrument will return to normal
operating mode.
WARNING

Always ensure you are in fresh
air when using this feature. Zeroing an instrument
in a contaminated atmosphere could result in
incorrect gas readings.
!
Full
0.0
OK
ppm
0.0
OK
ppm
0.0
OK
ppm
Peak display

8UK
Alarms
G-TECTA® SG has two instantaneous alarm level
settings, AL-1 and AL-2.
Alarm signals
The red and blue alarm LEDs will flash, the sounder
will emit a loud, fast series of beeps and the internal
vibrator alarm will activate. The display will show
the gas level and the alarm level alternatively.
Note: For any gas, there are normally 2 alarm levels
– these are indicated by the alarm icons:
The G-TECTA® SG is set to “latch” the alarm by
default. This means that the instrument will continue
to alarm until the operator presses the mode button.
Once you have evacuated the dangerous area,
press the mode button on the G-TECTA® SG
instrument; this will reset your G-TECTA® SG
to normal operating mode. If the G-TECTA® SG
continues to alarm, i.e. you are still in a dangerous
area, pressing the button will have no effect.
TWA Alarms
For toxic gas sensors, there are also two time
weighted average alarms (TWA). The TWA alarm
for toxic gases will operate when the short-term
(15 minute) or long-term (8 hour) time weighted
average alarm levels are exceeded. The G-TECTA
®
SG
will display “SWTA” (15 minutes) or “LTWA”
(8 hours) with toxic gas levels.
WARNING

TWA alarms are functional for
toxic gas instruments only.
WARNING

The 8 hour TWA alarm cannot
be cleared.
Flammable Over-range Alarm
If flammable gas levels exceed 100% LEL,
G-TECTA® SG locks into alarm and displays “9999”
showing an over-range condition. G-TECTA® SG will
temporarily cut off power to the sensor to prevent
burn out, and display a progress bar for 200
seconds. When the power timeout is complete,
the mode button should be pressed to put the
instrument back into normal operating mode. The
G-TECTA® SG can optionally be configured to force
the operator to switch the instrument off and
on to restart. This option is programmable with
G-TECTA® PC Software.
Note: All alarm configurations can be set with
G-TECTA® PC Software.
WARNING

If the sensor power is
reconnected when the unit is exposed to an over-
range gas concentration there is a risk of damage
to the pellistor sensor.
WARNING

Depleted oxygen levels can
reduce the flammable gas reading. If oxygen
levels are below safe breathing limits it should be
assumed that the flammable reading is low.
Instrument Settings
The following instrument settings can
be altered using G-TECTA® PC Software:
Alarm Levels for the Sensor
Level 1 and level 2 alarms can be set for
the gas sensor.
Alarm Trigger
The alarm trigger can be set for rising levels of
gas (toxic and flammable), or for falling levels of
gas (oxygen deficiency monitoring).
Alarm Latching
Latched alarms require the operator to press the
mode button to clear the alarm (default setting).
The alarm can be set to be latched or unlatched.
Unlatched alarms will clear automatically when
the gas hazard has passed.
H S 2
ppm

9
UK
Alarm Sounder Mute
The G-TECTA® SG sounder can be set to mute for
level 1 alarms only; pressing the mode button
during an alarm condition will silence the sounder
and stop the vibrating alarm. The alarm LEDs will
continue to flash.
Alarm Sounder Tone
Different distinctive tones can be selected for each
alarm condition. This optional feature can assist the
operator to ascertain the level of hazard.
WARNING

This feature should only be set
following extensive instrument user training.
Data & Event Logging
The G-TECTA® SG instrument records both gas
data and events. The logs can be accessed and
downloaded by using the G-TECTA® SG charger with
PC interface and by using G-TECTA® PC software.
Data is recorded in 1 minute intervals (the intervals
can be adjusted using the PC software). The data log
can record 900 hours of data at 1 minute intervals.
G-TECTA® SG also records the time and date for a
number of operating and diagnostic events including:
• Switch on and switch off
• Level 1, Level 2 and Time Weighted Average
Alarms (TWA) – alarm on, alarm off and peak
gas levels during the alarm
• Zero, calibration and gas testing – success or failure
• Flammable sensor alarms – on and off
• The battery condition – switch on, switch off,
while the instrument is operating, and certain
configuration changes are also logged
• The Event log can record over 4800 events
Batteries
Rechargeable Batteries
The re-chargeable batteries in the G-TECTA® SG are
Li-Ion batteries. The batteries will re-charge in less
than 6 hours when fully discharged. The battery life
is 12+ hours for flammable gas sensor instruments.
G-TECTA® SG Battery Chargers
There are 4 battery charger options for the
G-TECTA
®
SG instrument. The standard battery
charger is a single drop in charger cradle with
a power lead. Optional charger units include;
single drop in charger cradle with integral
PC interface, a 12 V vehicle charger, and a
5 instrument multi-charger.
Note: The multi-charger unit does not have
a PC interface option.
The chargers are powered by a nominal 12 V
dc input. The multi-charger includes a universal
power supply. To ensure compliance with product
certification requirements, charging voltages must
be limited to less than 9 V.
WARNING

Only re-charge the rechargeable
battery in a safe (non-hazardous) area and with a
Linde G-TECTA® SG charger. Failure to comply could
invalidate safety certification and may result in
permanent damage to the instrument.
Charging the Batteries
1. Ensure you are in a safe
(non-hazardous) area.
2. Plug the charger power supply into a mains
socket and connect to the charger.
3. Switch off the G-TECTA® SG and place the
instrument into the charger in an upright
position with the screen facing outwards
(see diagram below).
12V dc
H S
2
LED red indicates
battery charging
LED off indicates
charging complete
Power
Supply

10 UK
When the instrument is charging, the red LED on the
charger cradle will be lit and the instrument display
will also show the battery icon sweeping from
empty to full. When the instrument is fully charged,
the red LED will fade. When G-TECTA
®
SG is fully
charged and switched on the battery icon will show
three black bars.
Note: If the G-TECTA
®
SG is accidentally left switched
on during charging, the instrument will take longer
to charge and the battery icon will take 20 seconds
to update on removal from the charging cradle.
Changing Rechargeable Batteries
If you experience a noticeable reduction in battery
life in the instrument, rechargeable batteries
should be replaced by a Linde Group Authorised
Service Centre.
Note: To ensure hazardous area and instrument
ingress protection certification is maintained,
battery replacement should only be carried out by
trained and certified personnel.
Non-rechargeable Batteries
G-TECTA® SG uses a Lithium Cell battery pack which
will give up to two years of operation. Users may
change batteries in non-rechargeable versions only.
WARNING

G-TECTA® SG uses a CR2477
battery. To maintain compliance with instrument
certification, ensure only the following battery
types are used: Panasonic, GP, Energiser, Maxell.
Changing Non-rechargeable Batteries
To replace the battery pack:
1. Ensure you are in a safe,
non-hazardous area.
2. Always switch the G-TECTA® SG off before
opening the case to change the battery.
3. Remove the back cover and remove the
battery pack.
4. Replace the Lithium Cell in the battery pack.
5. Reinsert the battery pack into the instrument
and replace and securely fasten the
back cover.
Note: To ensure hazardous area and instrument
ingress protection certification is maintained,
battery replacement should only be carried out by
trained personnel.
Wearing G-TECTA® SG Instruments
G-TECTA® SG is supplied with a strong and durable
alligator clip. The alligator clip will securely attach
the instrument to a pocket, lapel, sleeve, belt etc.
G-TECTA
®
SG Chest/Neck Harness
The optional chest/neck harness allows the user to
mount the instrument on the chest or around the
neck for additional comfort.
Attaching the Chest Harness Plate
The chest harness plate is attached to the
instrument by replacing the alligator clip.
1. Remove the M3 screw on the back of the
G-TECTA® SG.
2. Remove the alligator clip.
3.
Position the chest harness plate and align the
screw holes.
4. Attach the screw and tighten.
Neck strap
Attach the strap to the top connectors and
place around the neck. Adjust the length of
the strap until the instrument is in a comfortable
working position.
Chest Harness
Leave the neck strap in position. Attach the other
strap to the side connectors and link around the
chest. Adjust the strap lengths until the instrument
is in a comfortable working position.

11
UK
Gas Sampling
To take a sample of a gas in a confined space or
where there are unknown levels of gas present
using G-TECTA® SG, the flow sample method can
be used. A flow cap and hose must be fitted over
the sensor on the front of the instrument and an
aspirator bulb fitted onto the other flow cap nozzle.
Note: A flow cap and a 2 metre length of hose
is included in the box with your G-TECTA® SG
instrument. The aspirator bulb and hose (Article
Numbers ASGTAK2 or ASGTAK3) is an additional
accessory.
1.
To fit the flow cap, clip the flow cap over the
sensor on the front of the instrument until it
is tightly fitted into place.
2. Attach the sampling hose onto one of
the nozzles.
3. Attach the aspirator bulb onto the
other nozzle.
4.
Check the aspirator bulb is attached correctly
by covering the end of the bulb and by
squeezing it gently. If there are no leaks,
the aspirator bulb should remain deflated
for a few seconds.
5. Squeeze the aspirator bulb once per second to
create a steady flow of air into the instrument.
We recommend the operator squeezes the
aspirator bulb at least 10 times (using the 2
metre hose supplied). Longer lengths of hose
and metal probes can be purchased. For
additional lengths of hose, we recommend
that the aspirator bulb is squeezed once for
every additional 30cm of hose to enable the
gas sample to reach the sensor. Continue to
squeeze the bulb for an additional 45 seconds,
or until gas readings stabilise.
6. To remove the flow cap, gently unclip the
cap from the sensor and lift it away from
the instrument.
WARNING

Manual aspirator remote
sampling only provides continuous gas readings
for the area in which the hose or probe is located
and when the aspirator bulb is being continuously
squeezed. Each time a new gas reading is required,
the aspirator bulb must be squeezed a sufficient
number of times to bring a fresh sample and a
stabilised reading to the sensor.
Maintenance, Calibration
and Gas Testing
Cleaning
Ensure the G-TECTA® SG display, operator button
and sensor filter remain free from dirt build up.
Regularly wipe over your G-TECTA® SG unit with a
damp cloth and inspect the sensor filter for dirt
or damage.
Gas (bump) testing
The atmosphere in which G-TECTA® SG instruments
are used can have lasting effects on the sensors.
Sensors may suffer losses in sensitivity leading
to degraded performance if exposed to
certain substances.
The Linde Group recommends a bump test each
time the G-TECTA® SG instrument is used or issued
for use. As a minimum, a monthly bump test is
required to confirm sensor operation.
A test gas of known composition (compatible
with the settings on the instrument sensor
module) needs to be applied,to verify sensor
response and alarm function.
Note: Please see The Linde Group data sheet
“Gas Detector Calibration Frequency” for further
advice on bump testing and calibration.

12 UK
The Linde Group manufactures and supplies
Gas Test Cylinders under numerous global product
brands, including Linde, BOC, AGA, Afrox etc.
The Linde Group gases supplied for use with your
G-TECTA® gas detection instrument are specially
formulated, high stability long life single gas mixes
The G-TECTA® SG instrument will determine
Pass/Fail status for the gas test.
In order to perform successful gas tests ensure:
• The gas used has the
recommended gas
concentration and it is within the validity date
specified by The Linde Group
• The gas flow path is leak tight. It is important
to check that the flow cap is properly fitted to
the G-TECTA® SG unit, the outlet tubing is not
restricted in any way, nor additional tubing
length used
The G-TECTA® Gas Test Kit comprises a full gas
cylinder, a regulator, interconnecting tubing, a
gas test key (used to activate Gas Test Mode
on the instrument), a flow cap to attach to the
G-TECTA® SG, and a vent line.
The Gas Test Kit is supplied in a convenient
carry case.
How to Perform a Bump Test
1. Ensure the G-TECTA® SG instrument is
switched on and in normal operating mode.
2. Fit the flow cap onto the front of the sensor
and attach the hose from the regulator. Attach
the outlet hose to ‘vent gas away’ – do not
extend this hose, restrict or allow kinks.
3. Place the Gas Test Key, vertically aligned,
onto the
instrument, to the left side of the
display. The G-TECTA
®
SG will activate the Gas
Test Mode and show ‘TEST’ on the display.
4. G-TECTA® SG will display a progress bar.
5. Apply the gas whilst the progress bar is
counting down. G-TECTA® SG will display
PASS or FAIL.
Note: In the event G-TECTA® SG displays
FAIL, please see the bump test/calibration
troubleshooting guide or contact The Linde Group.
6. To abort the gas test press the mode button
at any time whilst the test is in progress.
Instrument Calibration
Calibration of the gas sensor should be performed
regularly every 6 months. Over time the accuracy
of the gas sensor can drift outside of what is
considered a safe range and regular calibration is
essential to ensure accuracy of gas readings.
There are three methods of instrument calibration
available. G-TECTA® SG calibration can be
performed directly on each instrument (one button
calibration), by utilising G-TECTA® SG PC software
or by using the Linde G-DOCKA® Hub. Certified
calibration gases should be used.
WARNING

The accuracy of G-TECTA® SG
instruments should be checked periodically with
known-concentration of calibration gas. Failure
to check accuracy can lead to inaccurate and
potentially dangerous readings.
How to Perform a One Button Calibration Test
1. Ensure you are in clean air and the
instrument is in normal operating mode.
Double click the mode button and select
Zero from the options menu by double
clicking on the Zero icon. G-TECTA® SG will
perform an Auto Zero.
To perform a one button Calibration,
complete the next steps within 15
minutes of completing the Auto Zero.
2. Fit the flow cap onto the front of the sensor
and attach the hose from the regulator. Attach
the outlet hose to ‘vent gas away’ – do not
extend this hose, restrict or allow kinks.
3. Place the Gas Test Key, vertically aligned,
onto the instrument, to the left side of the
display. The G-TECTA® SG will activate the
Calibration Mode and show “CAL” and “????”
alternatively on the display.

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4. Press the mode button to confirm Calibration
within 10 seconds.
Note: If the mode button is not pressed within
10 seconds then the instrument mode will change
to Gas Test Mode.
5. G-TECTA® SG will display a progress bar.
6. Apply the gas whilst the progress bar is
counting down. G-TECTA® SG will display
‘PASS’ or ‘FAIL’.
Note: You can abort the Calibration test by
pressing the mode button at any time whilst the
test is in progress.
The G-TECTA® SG instrument will adjust the value on
the gas sensor to match the stored calibration gas
value within the sensor module. If the G-TECTA® SG
unit does not calibrate successfully, G-TECTA® SG
will display ‘FAIL’. Your G-TECTA® SG unit must be
re-calibrated or the sensor replaced.
Gas Test ‘pass’ and ‘fail’ and calibration ‘pass’ and
‘fail’ values are stored in the Event log.
WARNING

One button Calibration will
check for small drifts of stored calibration value.
The Linde Group recommends G-TECTA® SG is sent
for full certified calibration at six monthly intervals.
G-TECTA Ozone Instrument
Due to the reactive nature of ozone (O3) special
procedures should be followed when calibrating
gas detectors that incorporate an ozone sensor.
Fittings
For ozone calibrations all fittings and pipe work
should be stainless steel, brass, aluminium or PTFE.
Fittings or pipe work in other plastic materials such
as Tygon must not be used.
Gas flow rate
It is important that the flow rate is set correctly as
otherwise pressure effects may distort calibration
values and prevent the gas detector from working
correctly. To calibrate, the flow rate should be set
between 0.8-1.0 litres / minute (0.03-0.04 cubic
feet / minute)
Normal safety precautions for handling ozone
should always be observed along with any special
instructions that accompany the calibration gas
cylinder or generator being used.
G-TECTA® SG CO2 Instrument*
When G-TECTA® SG CO2 is zeroed in fresh air it
automatically sets the CO2 baseline level to 0.04%.
When zeroing the instrument in air, ensure you are
outside in clean air well away from a building or
any CO2 emissions. Please ensure the instrument
is held well away from the breathing zone of
the operator.
G-TECTA® SG CO2 can also be set to zero in nitrogen
by using G-TECTA® PC software.**
This is a zero point calibration rather than a
normal zero. In the PC software, set the calibration
value to 0.00%, apply nitrogen gas and click the
Calibrate button.
Note: After the zero point calibration is completed,
remember to re-set the calibration gas level to its
previous level.
* Also read the section – Instructions – specific for use in non-hazardous areas (Page 4)
** Recommended calibration gas is 2% CO2 in a background of nitrogen with a regulated flow of 0.5 l/min (1 SCFH).
Care should be taken to vent the nitrogen flow away from the operator and not allow nitrogen flow for longer than
necessary. If indoors, it is recommended to vent gas out of a window or into an extracted fume cupboard.

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Gas Test/Calibration Troubleshooting
Problem Possible Cause Solution
No response to gas Gas Cylinder Empty Check cylinder gauge.
Replace cylinder
Hose blocked or kinked Check hose and ensure
no gas flow restriction
Instrument fails gas test Gas cylinder empty Check cylinder gauge.
Replace cylinder
Gas cylinder out of date Check cylinder expiry date.
Replace cylinder
Hose blocked or kinked Check hose and ensure
no gas flow restriction
Calibration drifted Calibrate instrument
Gas flow not started in time Repeat gas test.
Start gas immediately
Instrument fails calibration Gas cylinder empty Check cylinder gauge.
Replace cylinder
Gas cylinder out of date Check cylinder expiry date.
Replace cylinder
Hose blocked or kinked Check hose and ensure
no gas flow restriction
Calibration drifted Calibrate instrument
Instrument stabilisation
time too short
Reset instrument stabilisation time
using G-TECTA
®
PC Software
Instrument passes gas
test but will not enter
calibration mode
Zero not performed
from options menu
Initiate zero on instrument menu
Instrument incorrectly configured Re-configure instrument.
Send to Linde Group service centre

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G-TECTA® SG – PC Interface
and PC Software*
G-TECTA® PC Software gives the user access to data
and event log files, printing reports, reconfiguring
alarm levels, instrument operation functions, and
running calibrations.
G-TECTA® SG can be connected to a PC by using
the G-TECTA® SG single drop in charger cradle
with optional PC interface. The charger cradle is
fitted with a D-type 9 pin RS232 socket , which
is supplied with a USB to RS232 adaptor. The PC
requires G-TECTA® PC software* and is connected
to the charger via a RS232 cable.
Set-up
1. Install G-TECTA® PC software on the PC.
2. Where applicable, install USB software**
(supplied in USB adaptor box)
3. Attach the RS232 cable to the charger
and the RS232 cable with the USB adaptor
(where applicable) to the PC
4. When using a USB adaptor to connect the
instrument, follow the procedure below:
(i) Before connecting the instrument,
check the available communications ports
available on the G-TECTA® PC software
options screen and note the ports available
(ii) Switch on the G-TECTA® SG instrument
and drop it into the charger cradle
(iii) Check the available communications
ports available again and select the new
port or port 4, 5 or 6 and save your changes
by clicking the save button on the bottom
right of the options screen
(iv) Close the G-TECTA® PC software
5. Switch on the G-TECTA® SG instrument and
drop it into the charger cradle ensuring it is
upright and the display is facing forward.
6. Open the G-TECTA® PC software and using
either the Wizard or the Engineer’s Form,
select G-TECTA® SG and upload the data
from the instrument.
Note: If the instrument does not connect to the
PC, select a different communications port and
try again
7. The software will allow you to access data
or configure the instrument as required.
Note: For more information on using the G-TECTA®
PC software, see the installed help file.
* G-TECTA® PC Software can be downloaded free of charge
from www.g‑tecta.com
** If the USB adaptor software does not start automatically,
select UC232A, the appropriate operating system and
install the driver
H S 2
RS 232 link

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G-TECTA® SG Product Specification
Dimensions 90 x 48 x 24 mm
Weight 90g (with toxic sensor)
105g (with oxygen sensor)
130g (with flammable sensor)
IP Rating (Dusts & Liquids) IP65 (NEMA 4) – designed to IP67
Operating Temperature Rating -20°C Ta +65°C (-4°F Ta +149°F)
Humidity Rating 20-90% RH – non-condensing, continuous operation
Display Bespoke LCD with backlight Starburst characters
– number & text display, screen icons (status & mode)
Warm-up time period Maximum 90 seconds
Typical response time T90: 10 seconds (oxygen)
20 seconds (toxic & flammable)
Alarm sounders* 95dB(A) Optional multiple alarm sounds
Visible alarms Dual colour Blue/Red flashing LEDs
Vibrating alarm Internal vibrating
Repeatability ±2% FSD, 6 months
Electromagnetic Compatibility 2004/108/EC
Explosion Protection Certification IECEx/ATEX/UL/CSA
IECEx IECEx BAS 09.0115 Flammable
IECEx BAS 09.0116 Oxygen/Toxic
ATEX BASEEFA09ATEX0240 Flammable
BASEEFA09ATEX0244 Oxygen/Toxic
UL UL913
CSA CSA22.2, 152
Approval Codes Global IECEx II 2G Ex ia d IIC T4 Gb Flammable
IECEx II 1G Ex ia IIC T4 Ga Oxygen/Toxic
USA Class I Division 1, Groups A, B, C and D
CSA Class I Division 1, Groups A, B, C and D
Safety & Operation Standards EN60079-0, EN60079-1, EN60076-11,
94/9/EC, EN50270, EN50271, IEC61508, EN61779
* It is recommended that the sounder output is periodically tested to ensure the instrument continues to operate as specified

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G-TECTA® SG Accessories
ASGTK G-TECTA® SG/4G/4GP Gas Test Key
ASSG1051 G-TECTA® SG External Dust Filter
ASSG1052 G-TECTA® SG Flow Cap Assembly
ASGTAK2 G-TECTA® Aspirator and 2m hose
ASGTAK3 G-TECTA® Aspirator and 3m hose
ASSG1054 G-TECTA® SG Chest Harness
ASSG1055 G-TECTA® SG Leather Carry Case
ASSG1057 G-TECTA® SG Gas Test Kit
ASSG1058 G-TECTA® SG 12v Battery Charger
ASSG1059 G-TECTA® SG 12v Battery Charger c/w computer interface
ASSG1060 G-TECTA® SG 230v Battery Charger Australian
ASSG1061 G-TECTA® SG 230v Battery Charger UK
ASSG1062
G-TECTA® SG 230v Battery Charger Europe
ASSG1063 G-TECTA® SG 110v Battery Charger USA
ASSG1064 G-TECTA® SG 230v Battery Charger Australian
c/w computer interface
ASSG1065 G-TECTA® SG 230v Battery Charger UK
c/w computer interface
ASSG1066 G-TECTA® SG 230v Battery Charger Europe
c/w computer interface
ASSG1067 G-TECTA® SG 110v Battery Charger USA
c/w computer interface
ASSG1068 G-TECTA® SG 5-Way Multi-charger Australian
ASSG1069 G-TECTA® SG 5-Way Multi-charger UK
ASSG1070
G-TECTA® SG 5-Way Multi-charger Europe
ASSG1071 G-TECTA® SG 5-Way Multi-charger USA
ASGTPCI G-TECTA® SG/4G PC Interface Lead with USB to RS232 Adaptor

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G-TECTA® SG Troubleshooting
Problem/Error Message Possible Cause Solution
Instrument won’t
switch on
Battery has no charge Re-charge or replace battery
Mode button released
too soon
Press mode button until
LEDs flash
No confidence beep Instrument function disabled
Reconfigure instrument
with G-TECTA PC Software
Gas reading on display
when in clean air
Instrument zero drifted Restart instrument in clean air
Unstable or inaccurate
gas readings
Sensor failure Do NOT use instrument
Exit hazardous area immediately
and return instrument for service
Auto Zero failure Instrument zeroed in
contaminated atmosphere
Switch off instrument
and restart in clean air
Alarm preventing
Auto Zero
Instrument zeroed in
contaminated atmosphere
Switch off instrument
and restart in clean air
Calibration expired Calibration due date has passed Return instrument for calibration
Display shows empty
battery symbol
Battery has no charge Re-charge or replace battery
If you experience any other issues with the operation of the G-TECTA® SG instrument,
please go to www.g‑tecta.com or contact an Authorised Linde Group Service Centre.

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Sensor Limitations
The sensors used in the G-TECTA® SG have
limitations common to all gas sensors, and users
should be aware of the points listed below.
The Linde Group can advise on particular situations
and suggest alternative sensors if the instrument is
likely to experience extreme conditions.
G-TECTA
®
SG flammable instruments use a catalytic
pellistor gas sensor. Common with sensors of
this type, instrument readings will be unreliable
over concentrations of approximately 120% LEL
and oxygen is necessary for catalytic sensors to
operate. A ‘pellistor saver’ is used to disconnect
power to the pellistor sensor in the event of “over-
range” (above 100% LEL) to prevent burn out.
This feature “locks out” the sensor for 200 seconds,
after which a press of the mode button on the
instrument will reconnect power to the pellistor.
Restart should be carried out in a known clean
air environment.
WARNING

If the sensor power is
reconnected when the unit is exposed to an
over-range gas concentration there is a risk of
damage to the pellistor sensor.
WARNING

Depleted oxygen levels
can reduce the flammable gas reading. If oxygen
levels are below safe breathing limits it should be
assumed that the flammable reading is low.
G-TECTA® Electrochemical gas sensors
(toxic gases or oxygen), contain chemicals.
Extreme levels of humidity can cause problems.
The sensors are rated for an (average) ambient
humidity of 15-90% R.H. However the sensors
are commonly used from the tropics, to deserts,
to tundra without any functional issues. Water
should not be allowed to collect on the sensor
as this may impede gas diffusion.
Persistent exposure to high levels of toxic gas will
shorten the life of a toxic sensor. If the high level
gas is corrosive (e.g. hydrogen sulphide), damage
may occur over time to metal components. Sensors
may be cross sensitive to other gases. If unsure,
contact The Linde Group.
Available Sensors
Sensor Type Range
(LEL) Methane 0-100%
(LEL) Propane 0-100%
(LEL) Pentane 0-100%
(LEL) Butane 0-100%
(LEL) Ethylene 0-100%
(LEL) Flammable alcohols,
ketones, general solvents
0-100%
(O2) Oxygen 0-25%
(O3) Ozone* 0-1 ppm
(CO) Carbon Monoxide 0-500 ppm
(CO) extended range
Carbon Monoxide
0-1500 ppm
(H2S) Hydrogen Sulphide 0-100 ppm
(H2S) extended range
Hydrogen Sulphide
0-500 ppm
(SO2) Sulphur Dioxide 0-10 ppm
(NO2) Nitrogen Dioxide* 0-10 ppm
(H2) Hydrogen 0-1000 ppm
(PH3) Phosphine* 0-5 ppm
(Cl2) Chlorine* 0-20 ppm
(HF) Hydrogen Fluoride* 0-10 ppm
(F2) Fluorine* 0-1 ppm
(COCl2) Phosgene* 0-1 ppm
(ClO2) Chlorine Dioxide 0-1 ppm
(NH3) Ammonia 0-100 ppm
(NH3) extended range
Ammonia
0-1000 ppm
(HCN) Hydrogen Cyanide 0-25 ppm
(NO) Nitric Oxide 0-100 ppm
(ETO) Ethylene Oxide 0-10 ppm
(CO2) Carbon Dioxide
(non Ex areas)
0-5%
* Reactive gases – see G-TECTA® datasheet on gas
sampling with reactive gases

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We hereby declare that on the date the products accompanied by this declaration
are placed on the market, the products conform with all technical and regulatory
requirements of the directives listed below.
Product Type
G-TECTA™ SG
Certification
BASEEFA09ATEX0240 Flammable
BASEEFA09ATEX0244 Oxygen/Toxic
IECEx BAS 09.0115 Flammable
IECEx BAS 09.0116 Oxygen/Toxic
Applicable Directives
Electromagnetic Compatibility 2004/108/EC
Explosive Atmospheres 94/9/EC
Notified Body
Baseefa 1180 Buxton UK
Provisions of the Directive fulfilled by the products:
Group II Category 2G Ex ia d IIC T4 Gb (-20°C Ta + 65°C) IP65 Flammable
Group II Category 1G Ex ia IIC T4 Ga (-20°C Ta + 65°C) IP65 Oxygen/Toxic
Conformity – Harmonised Standards
EN60079-0:2006; EN60079-11:2007; EN60079-1:2007 (Flammable Only)
EN50270:2006; EN50104:2002; EN60079-29-1:2007
Conformity – Other Standards
EN55022:2006 + A1:2007; EN61000-6-3:2001+A11:2004;
EN61000-6-4:2001; EN61000-6-2:2001
Signed:
Name: Peter Upcott
Position: Global Category Manager – Safety Products
Company: The Linde Group, GU2 7XY, UK
Date: June 2010
Declaration of Conformity
In accordance with ISO / IEC 17050-1:2004 and European Directive 94/9/EC