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8175
ENGLISH
CALIBRATION MENU
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4.4.4 GAS CHARACTERISTICS
In order for the 8175 level transmitter to find a precise measure of the level, the
characteristics of gas between the liquid and transmitter have to be defined.
● If this value is not known either a default value can be applied or the
characteristics can be calculated by performing a 2 point Teach-In.
● Within this option the values must be entered in m/s or ft/s depending on
the type of units selected (metric or imperial).
The default values for the gas characteristics are as follows:
Velocity of sound within the gas:
It is important that the velocity entered within this option is for the gas at
a temperature of 0°C.
Default value: 331.4 m/s within air at 0°C (32°F)
1087.3 ft/s within air at 32°F (0°C)
Temperature variation of the velocity:
Default value: 0.59 m/s / °C
0.075 ft/s / °F
If no temperature dependancy of the sound velocity is requested, calculate the
sound velocity at ambiant temperature with the following equation:
V = 331.4 m/s + 0.59 m/s x T°C
Enter this calculated value and enter 0.00 as the temperature variation coefficient.
GAS COMP
4.4.4
331,4 m/S
322,7 m/S
T° =0.400
T° =0.590
ECHO
Temperature
variation
coefficient
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