G-Finder Single O
2
/ CO / H
2
S Portable Single Gas Detector
GT-06519031501
PAGE 4 of 6
Rev 0.3(2019.06.21)
changed to the alarm value occurred by
pressing the button once again, and it is
changed to the normal display by pressing the
button once again.
6.
Alarms
An alarm is initiated when the sensor is exposed
to a gas concentration that exceeds alarm
setpoints. The alarm has two types; a low alarm
and a high alarm.
The alarm persists until the gas concentration
returns to an acceptable range. Battery life
decreases rapidly when the detector is in alarm
condition.
For G-Finder Single O
2
type, a low alarm occurs
when the measured concentration value is lower
than the low alarm setting value, while a high
alarm occurs when the measured concentration
value is higher than the high alarm setting value.
The following alarm settings are default for each
detector gas type.
Gas Type
Low Alarm
High Alarm
O
2
19.5% v/v O
2
23.5% v/v O
2
CO
35 ppm
200 ppm
H
2
S
10.0 ppm
15.0 ppm
When the alarm occurs, LEDs flash, vibration and
beep sounds occur and display will be changed as
below for example.
7.
Bump Test
1)
Press the button twice at the normal
operating mode in succession to get into the
menu, it shows "bUMP" on the screen.
2)
Press and hold the button until a 3 second
countdown is displayed, then continue to hold
until the countdown is completed to perform
the bump test.
3)
Then the gas Injection display, the low alarm
setpoint display, and the high alarm setpoint
display occur cross and the detector waits for
injection of gas which causes an alarm.
4)
If the detector detects the gas concentration
for the bump test, the bump test process is
performed automatically. The result will be
displayed on the screen at the end of the test.
If an alarm occurs during the bump test, the
test is succeeded, otherwise the test is failed.
8.
Zero the Sensor
In case of G-Finder Single O
2
, over time and
through use, the sensor baseline at zero exposure
may drift from the manufacturer’s baseline.
For optimal performance of O2 models, it is
recommended to zero the O2 sensor at least once
in a month at the condition of room temperature
and in a fresh air environment (20.9% v/v O2)
that is free of hazardous gas.
The user will be noted by the display of the
calibration reminder icon when the sensor
calibration is due. If the icon is showing please
zero the sensor as instructed below:
** For all gas types, we recommend to zero the
sensor periodically.
1)
Move to a normal atmosphere (20.9% v/v O2)
that is free of hazardous gas.
2)
Press the button twice at the normal
operating mode in succession to get into the
menu, "bUMP" will be displayed on the screen.
3)
"ZErO" is displayed on the screen by pressing
the button once, then press and hold the
button until a 3 second countdown is
displayed. Continue to hold until the
countdown is completed to calibrate zero.
4)
Wait until the zeroing process is completed.
5)
When the zeroing process is completed,
"PASS" or "FAIL" appears.
6)
After displaying the result, "ZErO" is displayed
on the screen again automatically.
7)
If "FAIL" appears, repeat the zeroing process
according to above procedure.
8)
If the zeroing process fails again, please
contact our service center.
