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Watlow D4T Data Logger
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Chapter 5 Function Reference
Sensor Type
Select the input device.
Options: RTD 100 Ohm, RTD 1000 Ohm
RTD Leads
Set the number of sensor leads connected to the flex module.
Options: 2, 3
Display Precision
Set how many decimal places are displayed for the process value and associated parameters
such as set points.
Options:
Whole, Tenths, Hundredths, Thousandths
Calibration Offset
Set a value to add to the measured input value to compensate for sensor placement, lead
wire resistance or other factors that cause the input to vary from the actual process value
Range: -99,999.000 to 99,999.000°F or units
-55,555 to 55,555°C
Filter
Set the amount of filtering to apply to the in-
put. Filtering smooths signal fluctuations. In-
crease the time to increase filtering. Excessive
filtering slows the input’s response.
Range: 0.0 to 60.0 second
Input Error Latching
Set whether an input error persists until it is
cleared or clears automatically when the sensor signal returns to a normal level.
Options:
• Off
: error clears automatically once the input returns to normal.
• On
: error remains active until the input returns to normal and the error is cleared by
the Clear Error parameter.
Clear Error
Set this parameter to
Clear
to reset the input error after correcting the condition that caused
it.
Options:
Ignore, Clear
1K Potentiometer
Use this sensor type to measure and scale a resistance input. These FBs are found on the
canvas of the FB diagram. The number of these FBs that are available depends on the number
of flex modules with universal inputs installed and configured for a potentiometer input.
The module number shown on the block is the number of the data logger’s slot that houses
the flex module with the universal input. The Universal Input number indicates the specific
input on the flex module.