Portable multi gas detector
QGM
12
5. CALIBRATION
CAUTION
The initial calibration is executed at WatchGas 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.
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.
If the calibration fails, FA (Fail), not OK appears on the LCD. 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 as it may require the replace-
ment of the sensor or repair of the device.
3 sec.
3 sec.
