PLX51-HART-4I / PLX51-HART-4O
♦
HART Input/Output
Diagnostics
Multidrop Field Devices
User Manual
ProSoft Technology, Inc.
Page 115 of 127
5.6.1 PLX51-HART-4I Calibration:
To re-calibrate a PLX51-HART-4I module,
1
Using an external milliamp source, adjust the current to 4 mA, or as close as
possible to 4 mA.
2
Enter the exact milliamp value, read from an external meter, into the
Low Value
Actual
numeric inputs.
3
Press the
Low Value
(4 mA)
Capture
button, to capture the current (un-
calibrated value) into the
Raw Capture
field.
4
Using the external milliamp source, adjust the current to 20 mA, or as close as
possible to 20 mA.
5
Enter the exact milliamp value, read from an external meter, into the
High Value
Actual
numeric inputs.
6
Press the
High Value
(20 mA)
Capture
button, to capture the current (un-
calibrated value) into the
Raw Capture
field.
7
The new
Span
and
Offset
calibration settings will be automatically calculated.
(See figure below).
8
Press
Accept
to write these new calibration figures to the module.
9
The Calibration Type will then change to User Calibration, to reflect the changes.
Figure 5.25 – User Calibration – Input
Important
: Before commencing with input calibration ensure that it is safe to do so. The simulated
current values could translate to extreme process variables in the connected control system which may
cause unexpected results. Failure to do so could result in severe equipment damage and personal
injury.