22
Input screen
Set the input type by pressing the appropriate button - relevant fields
(as shown below) will appear.
Fields Description
Engineering unit Sets the units used for the input low and high settings.
Input Low The input value corresponding to ‘zero’ (4 mA) output.
Input High The input value corresponding to ‘full scale’ (20 mA) output.
Damping factor Sets the damping factor for the inbuilt digital filter. Accepts values from 1-99.
# of samples The number of samples averaged for each measurement. The effect of this set-
ting depends on the input type. Normally set around 50.
10V Attenuator This check box allows you to set ‘Input High’ and ‘Input Low’ values in the
software in volts up to 10 V.
Note: The ITXPlus will only accept values up to 10 V if the attenuator switch on
the main board is set to the 10 V setting. If you change the switches you must
recalibrate the voltage input.
Burnout Sets the action in case of sensor burn-out or disconnection. Upscale sends the
output to 22 mA, downscale sends the output to 3.7 mA.
Type Allows you to choose between thermocouple or RTD types. Not shown for other
input types. Note: you can set up your own linearisation tables here by choosing
‘user defined’.
Input connection Is the input connected in two, three or four wire mode. For RTD and resistance
inputs only. Sets up the lead length compensation.
Output screen
Fields Description
Range Sets the output range, normally 4.00 mA to 20.00 mA.
Transfer function X
1
gives the usual proportional output.
Output action
Set to direct or reversed. Direct gives the usual proportional output. For reversed
action, the input low value gives a 20 mA output and the high value a 4 mA output.
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