User Manual
31
Flow Indicator Totaliser 1008S
REF NO: m18A/om/101
Issue No: 17
9. CALIBRATION PROCEDURE
9.1 Input Calibration
As explained earlier, One can do calibration thro' the keyboard itself, Zero and Full-scale
values are stored in NVRAM.
1. Switch on the instrument and allow 15 minutes of warm up time before starting
calibration.
2.
Take a standard source. Set it‟s output at desired Zero value. Apply output of the
source to the input terminals of connector pin according to input select.
3. In calibration mode, Press shift /start key to calibrate zero. This will show prompt -
“CAL Zr1”. To enter in “CAL Zr1” mode press shift /start key
4. Lower window displays a count. This is raw count proportional to analog input. Wait
till counts are stable, save this count by pressing „Index‟ key twice.
5.
Press ESC key to come out from “CAL Zr1”.
6. Now apply input equal to Full scale/Span (CALS):
7. Set output of the source at desired full-scale value. Apply output of the source to the
input terminals
8. Press index key to go to calibration span. This will show prompt -
”CAL SPn1”. To
enter in “CAL SPn1” mode press shift /start key.
9. Lower window displays raw counts count proportional to analog input.
10.
Allow the reading to settle and Press „Index‟ Key twice to save the count.
11. This reading will be stored as Span Now the instrument is calibrated.
12.
Press ESC key to come out from “CAL SPn1”.
9.2 Output Calibration
For output calibration, measuring instrument should be at
least 3 times accurate.
9.2.1 Out zero and Out span
These two parameter are used for the calibration of re-transmission output. Users have to
change the value of out zero and out span for the zero setting (for 4mA) and span setting (20
mA) respectively for re-transmission output.
1. In calibration mode, go to out zero calibration mode by pressing index key. This will
show “oUT ZEro” prompt. To enter in “oUT ZEro” mode press shift /start key
2. Lower window displays a count. Using shift /start or inc/stop key to set reading (zero
output) of connected ampere meter at output, exactly at 4.000mA and press index
key to store the calibration value.
3.
Press ESC key to come out from “oUT Zero”.
4. Press index key to go to out span calibration. This will show prompt-
“oUT SPAn”. To
enter in “oUT SPAn” mode press shift /start key
5. Lower window displays a count. Using shift /start or inc/stop key to set reading (span
output) of connected ampere meter at output, exactly at 20.000mA and press index
key to store the calibration value.
6.
Press ESC key to come out from “oUT SPan”.
This reading will be stored. Now the instrument is calibrated.
If user enters values greater than 4095
“error” message will appear.
It user enters
out zero value > out span
value then also “error” message will appear.
Accuracy of retransmission
O/p
- 0.25% of Full span.
