Watlow D4T Data Logger
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Chapter 5 Function Reference
Function
To calculate relative humidity based on wet and dry temperature measurements, set Function
to
Wet Bulb / Dry Bulb
.
Barometric Pressure
Set the atmospheric pressure in pounds per square inch (psi) of the environment for which the
humidity is calculated.
Range: 10.0 to 16.0 psi
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
Switch Over
When SW is off, the output equals input 1. When SW is on, the output equals input 2. A filter
and offset may be applied to the output. The output has the same units as the selected in-
put.
Signals
Direction
Label
Type
Function
Receivers
DRY
Analog
Selected as the output when SW is off
WET
Analog
Selected as the output when SW is on
SW
Digital
Off selects input 1, on selects input 2
Transmitter - - - - Analog
The filtered value of the selected input plus the offset
Function
To select one of two analog inputs with a digital input, set Function to
Switch Over
.
Offset
Adjustment added to the selected value.
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