User Manual
52
40005E (Enhanced Bargraph Indicator)
REF NO: m42B/om/101
Issue No: 02
9. CALIBRATION PROCEDURE
Calibration is provided for ambient temperature, PV sensor input, Analog Output (Retransmission
output)
(Optional)
.
First select the calibration function as described below and then follow the procedure depending on
the parameter to be calibrated. The sequences of parameters that will be available for calibration are
listed below:
Ambient temperature adjustment
PV Sensor input
Retransmission output (calibration for voltage or current)
Ambient temperature adjustment:-
CHANNEL window shows
Amb
(Ambient temperature adjusts).Press MENU key to show the current
Ambient value. CHANNEL window shows ambient temperature measured by the ENHANCED
BARGRAPH INDICATOR and by applying old calibration data. Press MENU key again to edit the
displayed value.DP of last digit and last digit itself will blink to indicate that the value can be changed.
Use INC / DEC (Here Decrement key is used to shift the digit in editing mode) key to adjust it to
desired value. Once the desired value is set then press MENU key, the blinking DP will go off to
indicate that the value has been registered. The ENHANCED BARGRAPH INDICATOR will
automatically save all the new calculations. Ambient temperature adjustment is over.
Press ESC key and then press INC key to calibrate other parameters or press Escape key to come
out to normal operation.
PV input sensor calibration:-
Note that all signal cards and all input type group must be calibrated before proceeding further. There
is no need to calibrate all input types. Just calibrate only one input type from one group and all other
input types from the same group will be calibrated automatically. Group calibration detail is given in
following table.
Table 29 Group Calibration Detail
Group NO
Input type
Calibration for input
1
E,J,K,T,N,0-100mv
Either of any input
2
B,R,S,-10 to 20mv
Either of any input
3
Pt-100(RTD), CU53, NI120
Either of any input
4
0-5v,1-5V, 0-10V, 4-
20mamp,0-20mamp
Either of any input
Note :
Kindly Calibrate following input type for gaining better accuracy.
1) For Group Number 1, calibrate 0-100 mV input type.
2) For Group Number 2, calibrate -10 to 20 mV input type.
3) For Group Number 3, calibrate Pt-100(RTD) input type and
4) For Group Number 4, calibrate 0 to 10 V input type.
When user enters in calibration zero menu, CHANNEL window shows
CAL.z
(CAL.Z) message.
Pressing MENU key again CHANNEL window shows
CH-1
(CH-1) message. Press MENU key, it
shows the PV value of corresponding input for channel number 1. User can use any channel out of
maximum number of channels(2) to calibrate input type for lower reading. Feed sensor input using a
calibrator, such that process value is close to lower range value.
Note
: The ENHANCED BARGRAPH INDICATOR
allows the user to calibrate sensor‟s input
anywhere in the range, but it is recommended that it should calibrate the input at points close to lower
and upper range values.
