Watlow F4T • 184 • Chapter 5 Function Reference
Function
To calculate the square root of an input, set Function to Square Root.
Offset
Adjustment added to the result of the calculation.
Range: -99,999.000 to 99,999.000
Filter
Set the amount of filtering to apply. Filtering smooths signal fluctuations. Increase the time to
increase filtering. Excessive filtering slows the function’s response.
Range: 0.0 to 60.0 seconds
Vaisala
®
RH Compensation
This function calculates the relative humidity of an environment based on the input from an
uncompensated relative humidity sensor and a temperature measurement. A filter and offset
may be applied to the calculated value. The output is in percent relative humidity.
Signals
Direction
Label Type Function
Receivers
~RH Analog Uncompensated humidity measurement
T Analog Temperature measurement
Transmitter - - - - Analog % Filtered calculated relative humidity plus the offset
Function
To calculate the relative humidity based on the input from an uncompensated relative humid-
ity sensor and a temperature measurement, set Function to Vaisala RH Compensation.
Offset
Adjustment added to the result of the calculation.
Range: -99,999.000 to 99,999.000
Filter
Set the amount of filtering to apply. Filtering smooths signal fluctuations. Increase the time to
increase filtering. Excessive filtering slows the function’s response.
Range: 0.0 to 60.0 seconds
Pressure to Altitude
This function determines the altitude based on the atmospheric pressure. A filter and offset
may be applied to the calculated value. The output has the units selected with the Altitude
Units parameter.
The calculation is based on the International Standard Atmosphere 1976 and is accurate from
sea level to 90,000 feet. It can be used beyond this range in both directions, but with loss
of accuracy. The standard is based on an altitude of 0 feet (sea level) pressure of 14.6967 PSI
and a temperature of 59 °F.
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