WatchGas QGM User manual

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QGM Multi Gas Detector
User Manual
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Contents
Contents 2
Description 3
Warning 3
Caution 3
1 Product Overview 4
2 Activation 5
2.1 Switch On 5
2.2 Switch O 5
3 Mode 6
3.1 Measuring Mode 6
3.2 Display Mode 6
3.2.1 Display Mode in Detail 7
3.3 Alarm Display 8
3.4 Initialization of detected concentrations 9
3.5 Check on Alarm Value 9
3.5.1 Initial Setting Concentration Levels 9
3.6 Dates and Time 10
3.7 Self Test 10
4 Event Log 11
5 Calibration 11
5.1. Fresh Air Calibration 11
5.2. Standard Gas Calibration 12
6 Specication 14
7 Limited Warranty 15

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Description
The QGM is a portable multigas monitor designed to warn the user about the presence of dangerous
gases in the atmosphere. The detector indicates the concentration of 4 types of gases (oxygen, carbon
monoxide, hydrogen sulde, combustible gas) simultaneously on the LCD monitor. It is simple to
operate. The QGM alerts the workers of the danger by alarm, LED, vibration when the concentration
exceeds the safety gas levels. The device shows the gas concentration in real time and identify the
maximum and minimum concentration. The settings values can be modied through WATCHGAS IR-
LINK (option).
Warning
• Please do not replace or change the parts. In this case, we do not guarantee the warranty and
safety even though it is under warranty.
• Please remove any debris on the surfaces of the sensor, LED or buzzer hole before use.
• Test the performance of the gas sensor through the gas beyond the alarm level regularly.
• Test the device on a regular basis whether its LED, alarm and vibration function properly.
• Use the device under the conditions instructed, including the temperature, humidity and pressure
range. The use environment outside the instruction may cause malfunction or failure.
• The sensors inside the device may indicate the gas concentration dierently according to the
environment such as temperature, pressure and humidity. Please make sure to calibrate the
detector under the same or similar environment to the specication.
• Extreme changes in temperature may cause drastic changes of the gas concentration. (e.g. using
the detector where there is a huge gap between the inside and outside temperature) Please use
the device when the concentration becomes stable.
• Severe pressure or impact may cause drastic changes of the gas concentration. Therefore, please
use the device when the concentration is stable. Severe pressure or impact may cause also
malfunction in the sensor or the device.
• The alarms are set according to the international standard and must be changed by an authorized
expert.
• Charging or replacing the battery should be done in a safe area where there is no risk of explosion
or re. Changing the sensor or battery with improper replacements, which are not authorized by
the manufacturer, may invalidate the warranty.
• IR communication should be done in a safe area where there is no risk of explosion or re.
• Changing settings in the available software with IR-link may pose a risk, which can result in trauma
or death.
Caution
• Please only use the device after reading the manual carefully!
• The device is not a measurement device, but a gas detector.
• Please stop using and consult the manufacturer if the calibration fails continuously.
• Please test the device every 30 days under the atmospheric environment of clean air without gases.
• Clean the exterior of the device with soft cloth and do not clean it with chemical detergent.

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1. Product Overview
DETECTOR COMPONENTS
1. Gas Sensor (O2)
2. Gas Sensor (LEL)
3. Gas Sensor (Dual: CO & H2S)
4. Key
5. IR Port
6. Alarm LEDs
7. LCD display
DISPLAY SYMBOLS
High Alarm
Low Alarm
Alarm Condition
STEL Alarm
TWA Alarm
Fresh Air Calibration
Device Stabilisation & Calibration
Succeeded
Standard Gas Calibration
Remaining Battery
1
2
3
4
5
66
7

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2. Activation
2.1 SWITCH ON
Press and hold down the KEY button ( ) for three seconds, after the three second countdown the
monitor will turn on.
The device will be switched on only when you keep pressing the button for longer than three seconds.
Once activated, the device will enter the warm up stage to stablize sensors. The warm up process is
completed, the device is ready to detect gases.
2.2. SWITCH OFF
Press and hold down the KEY button ( ) for three seconds, after the three second countdown the
monitor will turn o.
The device will not be switched o only unless you keep pressing the button for longer than three
seconds.
Caution
A proper calibration is always required before using the device at the work site. The user
shall check whether the device is properly sensing the levels of dangers of gases and make
sure whether the detecting section of the device is not blocked with materials impairing the
detection.

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3. Mode
3.1. MEASURING MODE
If the device goes into the normal measuring mode after stabilizing,
the gas concentration and the battery power level are displayed on
the LCD monitor. Oxygen is displayed in %VOL, combustible gases in
%LEL and H2S and CO in ppm unit. When the concentration levels
change, the value is displayed in real time, and when the levels
exceed the threshold for either LOW alarm or HIGH alarm (or TWA/
STEL), the display icons of LOW, HIGH, TWA or STEL blinks regularly
and the alarm, LED and vibration activates.
When the device goes to a safe area, the concentrations detected by the device declines and the alarm
stops. If the alarm does not clear on its self please acknowledge the alarm by pressing the KEY button
( ) once. Alarm latching options can be congured with the IR-Link software.
3.2. DISPLAY MODE
The displays in ten dierent modes as above are shown in the measuring mode every time when you
press the KEY button ( ).
The display mode consists of ten dierent informational screens, containing values for low, high,
TWA and STEL alarms, option for viewing and/or clearing peak values, show device information and
calibrate the instrument. Cycling through the dierent screens is done by pushing the KEY-button
once.

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3.2.1 DISPLAY MODE IN DETAIL
Measuring Mode (Basic Display)
Display the current gas levels of the atmosphere and the battery power level
Shows the minimum concentration in this session for the Oxygen sensor.
*In an ambient air, the Oxygen level normally indicates 20.9 %VOL.
Shows the maximal concentrations detected in this session for all sensors.
Shows the calculated TWA value for this session (Time Weighted Average 8 hours).
Shows the average concentrations for toxic gases for the last 15 minutes (Short
Term Exposure Limit).
Clear the previous Low, High (Peak), TWA, STEL values.
Check the current setting values manually.
(Low alarm, High alarm, TWA, STEL)
Check the rmware version and type (N type or P type)
Check on set SPAN calibration levels
Mode for ZERO calibration and SPAN calibration
Current Date and Time (format: YYYY/MM/DD)

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3.3 ALARM DISPLAY
Type Set-O Condition LCD Display Alarm Sound & Vibration Display
LOW Alarm Exceed LOW alarm
value
icon &
gas concentration
levels displayed
Buzzer, LED
Vibration
HIGH Alarm Exceed HIGH alarm
value
icon &
gas concentration
levels displayed Vibration
Buzzer,LED
TWA Alarm Exceed TWA alarm
value
icon and
gas concentration
time-weighted
average displayed
Vibration
Buzzer,LED
STEL Alarm Exceed STEL alarm
value
icon &
average gas
concentration levels
displayed
Vibration
Buzzer,LED
Bump Test
Due Date for
performing Bump
Test
Stops after Bump Test
Execute
Calibration
Due Date for
performing
Calibration
Stops after Calibration
LOW Alarm Sets O : When the user presses Key after noticing that the LOW alarm sets o, the sound
stops, but the vibration and LED alarm remain.
HIGH Alarm Sets O : The user must leave the area immediately, and the sound alarm/vibration/LED
alarm stops when the device goes to a safe area where the concentrations are normal.
TWA Alarm Sets O : The alarm sets o when the hourly average levels of the gas concentration for the
last eight hours exceed the TWA concentration, and the sound alarm/vibration/LED alarm stop when the
gas concentration levels reach the alarm set-o value as the user goes to a safe area.
STEL Alarm Sets O : The alarm sets o when the hourly average levels of the gas concentration for the
last 15 minutes exceed the STEL concentration, and the sound alarm/vibration/LED alarm stop when the
gas concentration levels reach the alarm set-o value as the user goes to a safe area.
Bump Test Interval (WATCHGAS IR-LINK Options): Notices the user on a regular basis to check the device.
Calibration Interval (WATCHGAS IR-LINK Options): Notices the user on a regular basis to calibrate the
sensor.

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3.4. INITIALIZATION OF DETECTED CONCENTRATIONS
You can see the minimum and maximum values for the concentration levels detected by the device as
well as the high TWA and STEL value on the display, and the values can be initialized. Press KEY button
( ) for three seconds on the CLR(Clear) mode on the LCD monitor, and the OK will appear on the
LCD monitor to notify the completion of the initialization.
3.5. CHECK ON ALARM VALUE
Press the KEY button ( ) for three seconds under the ALARM VAL mode and the set value for the
LOW alarm is displayed. Press the KEY button one time each to set the alarm set-o value for HIGH
alarm, LOW alarm, TWA and STEL alarm in the mentioned order.
3.5.1. INITIAL SETTING CONCENTRATION LEVELS
Flammables (Ex) Oxygen (O2) Carbon Monoxide (CO) Hydrogen Sulde (H2S)
LOW 10 %LEL 19,5 %VOL 35 ppm 10 ppm
HIGH 20 %LEL 23,5 %VOL 200 ppm 15 ppm
TWA N/A N/A 35 ppm 10 ppm
STEL N/A N/A 50 ppm 15 ppm
The set values can be modied on PC through the optional WATCHGAS IR-LINK.
Caution
The values of dierent gases in the device are set based on the international standards.
As such, the alarm set-o values for each gas can be modied upon the approval and
monitoring of the supervisor. The modication may be done through the optional
WATCHGAS IR-LINK.

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3.6. DATES AND TIME
Press KEY button ( ) under the (YY/MM/DD) mode for 3 seconds and the day/time mode will ap-
pear. Press the KEY button ( ) again for 3 seconds under the (D/T) mode and it will go back to previ-
ous mode.
* The current time shall be automatically synched with that of the PC when linked with WATCHGAS IR-
LINK.
3.7. SELF TEST
Press and hold the button for 3 seconds. The device will start the self test checking buzzer, LED, LCD,
Motor, Memory, and Temperature.

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4. Event Log
Up to 30 events may be saved and when the list exceeds 30, the oldest data will be automatically dele-
ted. The saved data can be checked when transmitting it to PC through WATCHGAS IR-LINK.
Data log records the operation status every second and normal data logs do not last more than 2
months.
Log Categories Log Details
EVENT (High, Low, TWA, STEL) Alarm Occurrence time, Duration, Alarm Type, Gas Concentration, Serial Number
BUMP TEST Log Test date, Pass/non-pass, Calibration Gas Concentration, Detected Concentration
Calibration Log Date of the Calibration, Type, Calibration Gas Concentration, Detected Concentration
Data Log Time, Date of executing IR-LINK, Concentration, Alarm Types, Options
5. Calibration
Caution
The initial calibration is executed at WATCHGAS CO. Ltd. before device release. The
calibration values are saved in the device which means inaccurate calibration may impair the
accuracy of the device performance. Normally, the calibration should be done once a year
after the purchase and regularly every six months thereafter.
Caution
Because it is calibrated on the assumption that oxygen concentration is 20.9%vol, the
combustible gas is 0%LEL, and the toxic is 0ppm in the normal fresh atmosphere, fresh air
calibration must be conducted in the absolutely clear air without any impact of other gases.
Fresh air calibration in the airtight spaces therefore is not recommended. Make sure to
avoid operation under the work environment where people may inhale gases. purchase and
regularly every six months thereafter.
5.1. FRESH AIR CALIBRATION
Press KEY button ( ) for 3 seconds under the gas calibration value mode and the icon signifying
fresh air calibration will appear on the LCD monitor with the phrase“CAL ZERO.”Press for another 3
seconds to do fresh air calibration and it takes 10 seconds to calibrate. Press the button during the
calibration process to stop the calibration. If you press the button upon the completion, It will return
to the fresh air calibration mode, and if you don’t press the button, it automatically enters the measure
mode.

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5.1. FRESH AIR CALIBRATION CONTINUED
If the calibration fails, FA (fail) will appear on the display instead of ok. Press the
button to enter the initial fresh air calibration mode and it changes into the
measure mode if you do not press the button for 3 seconds. If FA continues, please
consult Watchgas or the store you purchased the device as it may require the
replacement of the sensor or repairs in the device.
5.2. STANDARD GAS CALIBRATION
Press KEY button ( ) under the fresh air calibration mode and the icon signifying standard gas
calibration will appear on the LCD monitor with the phrase “CAL SPAN.”Press for 3 seconds to do the
standard gas calibration and it will be completed automatically in 90 seconds. Press the button during
the calibration to stop. If you press the button upon the completion, It will return to the initial standard
gas calibration mode, and if you don’t press the button, it automatically enters the measure mode.
If the calibration fails, FA (fail) will appear on the display instead of ok. Press the
button to enter the initial fresh air calibration mode and if you do not press the
button, it changes into the measuring mode. If FA continues, please consult
WATCHGAS or the store you purchased as it may require the replacement of the
sensor or repair of the device.
DISPLAY FOR CALIBRATION COUNT

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INITIAL STANDARD GASES CONCENTRATION FOR CALIBRATION
Combustible 2.2 %VOL CH(= methane 50 %LEL)
Oxygen 18 %VOL
Carbon Monoxide 50 ppm
Hydrogen Sulde 10 ppm
* The concentration for calibration may be modied on PC through the optional WATCHGAS IR-LINK.
DOCKING STATION
Standard gas calibration can be easily done through Docking Station (option), which holds gas inside.
* Docking Station is used to determine whether the devices functions properly by the bump test
before using QGM in the work site.

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6. Technical specications
MODEL QGM
LEL O2CO H2S
Measuring type Diusion
Measuring method Catalytic [QGM-CAT]
Infrared [QGM-IR] Electrochemical
Measuring range 0-100 %LEL 0-30 %VOL 0-500 ppm 0-100 ppm
Resolution 1 %LEL 0.1 %VOL 1 ppm 0.1 ppm
Sensor life time > 2 year 2 year > 2 year > 2 year
Operation Single Button
Alarm Display Digital LCD display, LCD Backlight, indicator LEDs, ashing alarm
Operation mode display Visual: LCD alarm display, LCD Backlight, Indicator LED
Acoustic: buzzer (90 db @ 10 cm) and vibrating alarm
Event log Data log 2 months or more
Event log / calibration log / bump log: 30 event
Mounting type Stainless steel belt clip
Programming WatchGas IR Link with PC software
Operation temperature -20 to +50° C
Operating Humidity 10 to 95% RH, non-condensing
Battery Type: Lithium-ion rechargeable battery
Charging time < 6h
Operation time QGM-CAT: 24 hours, QGM-IR: 2 months
Housing Rugged durable housing with impact proof coating IP67
Dimensions 60 x 40 x 118 mm (WxDxH)
Weight < 240 g
Approval
QGM-IR:
Class I, Division 1, Groups A,B,C, and/or D,
T4 Ex ia IIC T4 Ga Class 1, Zone 0, AEx ia
IIC T4 Ga
Sira 18ATEX2059X
QGM-CAT:
Class I, Division 1, Groups A,B,C, and/ or D,
T4 Ex da ia IIC T4 Ga Class 1, Zone 0, AEx
da ia T4 Ga
Sira 18ATEX2059
Option WatchGas IR Link, WatchGas Docking Station
Compatible options
WatchGas IR-Link Docking Station Sampling Pump

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7. Limited Warranty
WATCHGAS warrants this product to be free of defects in workmanship and materials-under normal
use and service-for two years from the date of purchase from the manufacturer or from the product’s
authorized reseller.
The manufacturer is not liable (under this warranty) if its testing and examination disclose that the
alleged defect in the product does not exist or was caused by the purchaser’s (or any third party’s)
misuse, neglect, or improper installation, testing, or calibrations. Any unauthorized attempt to repair
or modify the product, or any other cause of damage beyond the range of the intended use, including
damage by re, lightening, water damage or other hazard, voids liability of the manufacturer.
In the event that a product should fail to perform up to manufacturer specications during the appli-
cable warranty period, please contact the product’s authorized reseller or WATCHGAS service center at
[phone] for repair/return information.
WatchGas B.V.
Sextantstraat 61
2908 ZZ Capelle aan den IJssel
[phone]
The Netherlands
[e-mail] - www.watchgas.nl
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All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including
photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the
case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted by copyright law. For permission
requests, contact WatchGas B.V.