Model S4000CH
28
seconds, while the unit acquires the zero reading. Ensure that the sensor is seeing clean
air during this time. Calibration mode can also be entered via remote switch. This option
cannot be used when the ARGC is enabled.
Figure 21: Automatic Calibration Mode
Apply the calibration gas concentration to the sensor (usually 50% LEL of the desired
gas). The display will change from “
AC
” (Automatic Calibration) to “
CP
” (Calibration in
Progress), indicating that the sensor is responding to the calibration gas (Figure 22).
Figure 22: Calibration in Progress Mode
After one or two minutes, the display will change from “
CP
” to “
CC
” (Figure 23), indicating
that the calibration is complete.
Figure 23: Calibration Complete Mode
Remove the gas and wait for the unit to return to normal operation. The display will
indicate a few percent full-scale and then drop to “
0
”.
The unit is now calibrated and the new ZERO and SPAN values have been stored in the
non-volatile memory (EEPROM).
NOTE:
The sensor life figure displayed is that calculated on completion of the last
calibration. To determine the current sensor life, calibrate unit and then repeat steps 1
and 2.
3.14.2 Aborting Calibration
If calibration is to be aborted, and gas has not been applied, wait ninety seconds and
reapply the magnet. The unit will return to normal operation with the previous calibration
values unchanged.
NOTE:
Once gas has been applied, it is not possible to abort a calibration.
Содержание S4000CH
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Страница 22: ...Model S4000CH 14 Figure 12 S4000CH Terminal Block Locations Figure 13 Remote Junction Box Terminal Block ...