OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
18
7.6
Manual calibration
To perform calibration of the instrument, the user can use following schematic diagram (or similar).
It is required to use moistured calibration gas (see § 4.7) and two hand-ball valves to select between instrument air (zero gas) and
calibration gas (span gas) supply to calibration inlet port of unit.
The procedure of calibration is described in chapter § 6.7.
7.7
Recommended calibration gas
For automatic calibration or manual calibration (see procedure in chapter 6.7.3) customer shall use following calibra-
tion gases:
1)
zero gas = instrument air (21 %O
2
, 0 ppm HC)
2)
span gas = 2…3 %O
2
; 400…600 ppm CO ; 40…60 ppm H
2
; rest N
2
Note: It is highly recommended to use water bubblier to moisture the calibration gas!!!
Manual calibration
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