Watlow D4T Data Logger
•
140
•
Chapter 5 Function Reference
Thermocouple
This FB is 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 as a
thermocouple.
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.
Signals
Direction
Label
Type
Function
Transmitter - - - -
Analog
Supplies scaled, absolute temperature ± the offset as a
connection to another FB.
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Sensor Type
To detect and condition a temperature measurement set Sensor Type to
Thermocouple
.
TC Linearization
Select the Thermocouple type.
Options:
B, K, C, N, D, R, E, S, F, T, J
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 input.
Filtering smooths signal fluctuations. Increase 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.
