<10. Other Functions>
10-2
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
A32 Min. oxygen concentration % O
2
A77 Calibration history 7 YY.MM.DD/
HH.MM
A33 Occurrence of minimum oxygen
concentration
YY.MM.DD/
HH.MM
A78 Calibration history 8 YY.MM.DD/
HH.MM
A34 Average oxygen concentration % O
2
A79 Calibration history 9 YY.MM.DD/
HH.MM
A35 Maximum humidity %H
2
O A80 Time YY.MM.DD/
HH.MM
A36 Occurrence of maximum humidity YY.MM.DD/
HH.MM
A90 Software revision
A37 Minimum humidity %H
2
O
A38 Occurrence of minimum humidity YY.MM.DD/
HH.MM
A39 Average humidity %H
2
O
A40 Maximum humidity kg/kg
A41 Occurrence of maximum humidity YY.MM.DD/
HH.MM
A42 Minimum humidity kg/kg
A43 Occurrence of minimum humidity YY.MM.DD/
HH.MM
A44 Average humidity kg/kg
10.1.1 Oxygen Concentration
The oxygen concentration in the process gas is displayed (consult Section 9.1.1, earlier in this
manual).
10.1.2 Humidity
The moisture content contained in air is displayed where the process gas contains water vapors
and air (refer to Section 9.1.1, earlier in this manual).
10.1.3 Mixing Ratio
Where the process gas contains water vapors and air, their mixing ratio is displayed (refer to
Section 9.1.1, earlier in this manual).
10.1.4 Relative Humidity
The relative humidity “U” may be obtained using the following theoretical equation (JIS Z 8806).
U = e/e
s
x100
where, e = Water vapor pressure of moist air
e
s
= Saturated water vapor
Since the gas-pressure ratio is equal to the volume ratio, the above equation may be expressed
mathematically by:
U = P x H/ e
s
x100
where, P = Gas pressure
H = Humidity (volume ratio)
The saturated water vapor pressure es is determined by a gas temperature, so the relative
humidity can be obtained by entering the parameters. Use parameter F13 for temperature entry.
Use parameter F14 for pressure entry.
10.1.5 Dew Point
The dew point is the temperature at which a water vapor pressure in the moist air is equal to the
saturated water vapor pressure.
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