Watlow F4T User Manual

Watlow F4T • 179 • 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

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4