June 12, 2012
Page 7 out of 14
⑥
Then, please stop infusing the gas and dissemble the calibration nipple while LCD values gets
less and shows “Holding PPM” finally.
⑦
After 3 minutes when an LCD value gets less than 9 PPM, it automatically enters into measuring
mode. (Or when LCD value gets less than 9 PPM, you can touch RESET key to enter into
measuring mode)
▲ Caution:
Span calibration gas should be ranged from 5ppm to 90ppm. Sensor calibration is not
possible with high density gas. High density gas puts excessive burden to the sensor and it damages
the sensor or reduces the sensor life time extremely.
▲ Caution: For calibration after sensor replacement, please wait 10 minutes from power on.
[Sensor Replacement]
DA-50 has sensor cap & sensor filter in order to protect sensor. This sensor cap composes of two
modules for easy disassembly. Please follow below steps for sensor replacement.
①
Please make sure of power off to DA-50.
②
Please open the cover of DA-50.
③
Please unscrew the two bolts fixing the display board and disassemble the display board.
④
Please disassemble the 3 wire connector which connects the sensor and sensor board.
⑤
Please rotate the sensor cap counterclockwise and detach the sensor cap.
⑥
Please rotate new sensor cap clockwise and fix it.
⑦
Please connect the 3 wire connector between sensor and sensor board.
⑧
Please fix the display board screwing the two bolts.
⑨
Please fix the four nuts on the cover of DA-50
⑩
Please power on.
⑪
Please do sensor calibration.
⑫
After sensor calibration, measuring mode automatically starts.
▲ Caution
Please make sure of power off to DA-50 before sensor replacement or display board
disassembly.
If the direction of sensor cable connector is different with sensor board connector socket, both
can not be assembled.
Please fix the sensor cap and main cover tightly to keep water proof structure.
