Model: LC5296 Dual Channel Temperature Controller
Doc. Ref. no.:- m61C/om/101
Issue no. 01D/ENGG-114
User’s Manual
Page 24 of 30
8. CALIBRATION PROCEDURE
8.1 Procedure for CAL-zero and CAL-span
The instrument is factory calibrated for the specified range, but due to long term drift
of components, re-calibration may be necessary in some cases. For calibrating the
instrument a reliable source is required. This source should be at least ten times
accurate compared to the range of the instrument.
The unit can be calibrated without opening it and without trim pots.
For Entering into the Calibration Mode, Please refer Menu Layout.
After applying appropriate Input from the calibrator source, press ‘INCREMENT’ OR
‘DECREMENT KEY’ to bring the actual process value on display.
Example:-
At zero calibration reading expected on the display is 100 and it shows 107, adjust
the process value to 100 by using ‘DECREMENT KEY’. Now press ‘SET’ to store the
calibration parameter in non-volatile memory. Similarly one can calibrate Ambient,
SPAN and retransmission parameters.
8.2 Procedure for RET-zero and RET-span
For calibrating the retransmission output, both retransmission zero and
retransmission span has to be calibrated. At a time there can be either one or two
retransmission output available. If only one retransmission is used, then calibrate
RTZ1
(retransmission 1 zero)
and
RTS1
(retransmission 1 span)
and if there are two
retransmission outputs available, then calibrate
RTZ2
(retransmission 2 zero)
and
RTS2
(retransmission 2 span) for second retransmission. No need to feed input
while calibrating retransmission o/p. it is like calibrating using digital trim pot. Only
look at the output, display value has no significance with output generated.
Example:-
At retransmission zero calibration, expected output is 4.00mA and it gives 4.153mA.
Then adjust the output value to 4.000 by using ‘DECREMENT KEY’. Now press
‘SET1’ to store the calibration parameter in non-volatile memory. Similarly one can
calibrate retransmission span.
