Optex DOS-20 - Altitude Adjustment

Adjustment
39
Altitude adjustment
Perform correction for correct measurement and calibration of dissolved
oxygen density at high altitude.
The saturated dissolved oxygen content is compared against the oxygen
content in the surrounding atmosphere. As the altitude increases, the air
pressure in the atmosphere is lowered and the saturated dissolved oxygen
content becomes smaller.
Example)
1013 hpa: Saturated dissolved oxygen content is 8.26 mg/L (25
°
C)
506.5 hpa: Saturated dissolved oxygen content is 4.13 mg/L (25
°
C)
When the air pressure is halved, the saturated dissolved oxygen content is
also halved.
Measurement at high altitude requires altitude adjustment.
This product adjusts by altitude (m) instead of atmospheric pressure (hpa).
Press .
The measurement item selection display is displayed.
1
Measurement item Setting range Factory default setting
Altitude Adjustment 0 to 5000 (by 10) 0
2
Select an item to perform altitude
adjustment using
, and
press
.
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Measurement item
Sensor model
Sensor channel
Use to switch pages.
The adjustment menu is displayed.
Caution
When setting the altitude with this sensor, the calibration is
automatically performed with the use of the altitude adjustment value.