Watlow F4T • 185 • Chapter 5 Function Reference
Signals
Direction
Label Type Function
Receiver
- - - - Analog Pressure (See Pressure Units parameter)
Transmitter - - - - Analog
The calculated altitude plus the offset (See Altitude Units
parameter)
Function
To calculate the standard distance above sea level based on an atmospheric pressure, set
Function to Pressure to Altitude.
Pressure Units
Set the units of the pressure input.
Options: PSI, mbar, Torr, Pascal, Atmosphere
Altitude Units
Set the units for the altitude output.
Options: Feet, Kilofeet
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
Process Errors
Inputs that are not connected are ignored. Otherwise error behavior is specific to the Func-
tion setting.
Function Error Condition Result
Off Any or none
The output value and error follow the
first input.
Sensor Backup
One or more, but not all inputs
have errors
The output’s value follows the first in-
put without an error.
All inputs have errors
The output value and error follow the
first input.
Average
One or more, but not all inputs
have errors
The output value is the average of the
inputs that have no errors and the out-
put has no error.
All inputs have errors
The output has the last good value and
has an error.
Crossover
A or B has an error but not both
The output is equal to the error free
input plus the offset
A and B both have errors
The output’s value and error follow in-
put A.
Wet Bulb Dry
Bulb
DRY or WET or both have errors RH has an error
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