WatchGas QGM User manual

USER MANUAL
Portable multi gas detector
QGM
we watch gas where you can't

CONTENTS
DESCRIPTION 3
WARNING 3
CAUTION 3
1. PRODUCT OVERVIEW 4
2. ACTIVATION 5
2.1 Switch On 5
2.2 Switch Off 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 Levelsl 9
3.6 Dates and Time 10
3.7 Self Test 10
3.8 Check on bump test interval date and Latest bump test
date 11
3.9 Check on span calibration interval date and Latest span
calibration date date 11
4. EVENT LOG 11
5. CALIBRATION 12
5.1 Fresh Air Calibration 12
5.2 Standard Gas Calibration 13
5.3 Bump Test 14
6. SPECIFICATION 15
7. LIMITED WARRANTY 16

3
DESCRIPTION
QGM is a portable multi gas detector to warn the dangerous environment related to the
gases. The detector indicates the concentration of 4 gases oxygen, carbon monoxide,
            
simple to operate. The device alerts the workers of the danger by alarm, LED, vibration
when the concentration exceeds the safety gas levels The device shows the gas concen-
tration in real time and identify the maximum and minimum concentration. The settings

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 differently accordin g to
the environment such as temperature, pressure and humidity. Please make sure to cali-

• 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 temperatu-
re).
• 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

not authorized by the manufacturer, may invalidate the warranty.
• 
CAUTION
• Please use 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.

Portable multi gas detector
QGM
4
DETECTOR COMPONENTS
1. Gas sensor (O
2. Gas sensor (LEL)
3. Gas sensor (Dual: CO & HS)
4. 
5. 
6. Alarm LED
7. LCD display
8. Buzzer
1. PRODUCT OVERVIEW
4
3
7
1
2
DISPLAY SYMBOLS
8
6
6
6
6
High alarm
Low alarm
Alarm condition
STEL Alarm

Fresh Air Calibration
Device stabilization &
Calibration succeeded
Standard Gas calibration


5
 
2. ACTIVATION
2.1 SWITCH ON
Press and hold down the  ( ) and the device will be switched on along with the three
seconds countdown.
NOTE: 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.
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.
2.2 SWITCH OFF
 ( ) and the 3, 2 and 1 in the mentioned order will appear on the

NOTE: The device will not be switched off only unless you keep pressing the button for longer
than three seconds.

Portable multi gas detector
QGM
6
3. MODE
3.1 MEASURING MODE
If the device goes into the normal measuring mode after stabilization,
the gas concentration and the battery power level are displayed on
the LCD monitor. Oxygen is displayed in %vol, combustible gases in
%LEL and H
the value is displayed in real time, and when the levels exceed the
          
           
alarm, LED and vibration activates.

the device declines and the alarm stops. Even after going to a safe
area after the alarms set off, the icon of the alarm does not go away, and you must push the Key
 ( ) to make it go away.
3.2 DISPLAY MODE
The displays in ten different modes as above are shown in the measuring mode every time when
you press the ( ).

7
3.2.1 DISPLAY MODE IN DETAIL
LCD DISPLAY
IMAGES DESCRIPTION
• 
• Display the current gas levels of the atmosphere and the battery
power level
• The minimum gas concentration detected by the device.
*In an ambient air, the Oxygen level normally indicates 20.9%vol.
• The maximum concentration detected by the device.
*In an ambient air, the Oxygen level normally indicates 20.9%vol.
• Acceptable hourly average exposure levels of the toxic gases for the

• Acceptable average exposure levels of the toxic gases for the last 15
minutes (Short Term Exposure Limit)
• 
• Check the current setting values manually.
(Low alarm, High alarm, T
• 
• Check on set SP
• 
• Current Date and Time
• Check bump and calibration interval remaining days
• Latest bump date and calibration date check.

Portable multi gas detector
QGM
8
3.3 DISPLAY MODE
TYPE 
CONDITION LCD DISPLAY ALARM SOUND & VIBRATION DISPLAY
 
alarm value
icon & gas
concentration levels
displayed
HIGH Alarm Exceed HIGH
alarm value
icon & gas
concentration levels
displayed
 

icon & gas
concentration levels
displayed
STEL Alarm 
STEL alarm value
icon & gas
concentration levels
displayed
Bump Test 
Bump Test Stops after Bump Test
Execute
Calibration

Calibration Stops after Calibration
LOW Alarm Sets Off:
sound stops, but the vibration and LED alarm remain.
HIGH Alarm Sets Off:            

normal.
TWA Alarm Sets Off: The alarm sets off when the hourly average levels of the gas concentration

alarm stop when the gas concentration levels reach the alarm set-off value as the user goes to
a safe area.
STEL Alarm Sets Off: The alarm sets off when the hourly average levels of the gas concentration

alarm stop when the gas concentration levels reach the alarm set-off value as the user goes to
a safe area.
 
device.

the sensor.

9
3.4 INITIALIZATION OF DETECTED CONCENTRATIONS
You can see the minimum and maximum values for the concentration levels detected by the

Press  ( 
will appear on the LCD monitor to notify the completion of the initialization.
3.5 CHECK ON ALARM VALUE
Press the  ( ) for three seconds under the ALARM VAL mode and the set value for
 one time each to set the alarm set off value for

3.5.1 INITIAL SETTING CONCENTRATION LEVELS
INFLAMMABLES

OXYGEN

CARBON MONOXIDE

HYDROGEN SULFIDE

 10 %LEL 19% 30 ppm 10 ppm
HIGH 30 %LEL 23% 60 ppm 20 ppm
 30 ppm 10 ppm
STEL 200 ppm 15 ppm

3 sec.

Portable multi gas detector
QGM
10
CAUTION
The values of different gases in the device are set based on the international



3.6 DATES AND TIME
Press the button ( 
appear. Press the button ( 
previous mode.


3.7 SELF TEST
3 sec.