Temperature Indicator : 409-4IN
REF NO: m47/om/201
Issue NO: 04
Page 23 of 34
7.
Calibration Procedure
Calibration for Input
The calibration in the instrument is using front panel keys only. Instrument can be
calibrated even during installed condition.
Calibration is carried out using following steps.
1) First of all enter in to calibration mode using front panel keys. Display indicates
“
Cal
” in 4-segment display.
2)
Press ‘MENU’ key to enter in to calibration for “zero”, “span” or “ambient”
3)
Display indicates “
Calz
” for zero calibration;”
CALS
” for span calibration and
“
AMB
” for ambient calibration. User can enter in to zero/span/ambient calibration
using UP, DOWN keys.
4) Input type other then thermocouple display will be either
“
CALZ
” or “
CALS
”
because for other inputs (except thermocouple) ambient calibration is not
required.
5) To perform zero calibration, press DOWN key when display
shows “
CALZ
”. Feed
input corresponding to zero and adjust the value of display using UP, DOWN
keys .Once value is adjusted using UP, DOWN keys press ENTER to store that
value in memory .Display will start flashing when user presses ENTER key.
Same procedure is required to perform calibration for span or ambient type.
6) Sometimes user may require iteration for zero and span calibration for better
linearity/accuracy.
7) Depending upon input type selected value in the display is calibrated within
limited range.
Input type
Calibration for input
E,J,K,T,B,R,S
Either of any input
Pt-100, 0-
400Ω
Either of any input
0-10V,0-5V,1-5V,0-2V,0.4-
2V,4-20mA,0-20mA
Either of any input
±10V
Specific input
±75mV,75mV,-10
– 20mV
Either of any input
0-
6000Ω
Specific input
Table 10.
