Model S4000CH
32
If the initial reading is greater than 5% LEL, an ARGC error will be indicated. This
means the valve could be leaking.
The display will change to “
AC
” and the gas will be turned on. If the gas reading is less than
60% of the calibration gas, an ARGC error will be indicated. The display will change from
“
AC
” (Automatic Calibration) to “
CP
” (Calibration in Progress), indicating that the sensor is
responding to the calibration gas.
After one or two minutes, the display will change from “
CP
” to “
CC
” (Figure 26) indicating that
the calibration is complete. Once the valve closes and the ARGC exposes the sensor to
atmosphere, the system measures the rate the gas leaves the sensor. If it is slow the valve
is sticking and an ARGC error is indicated.
Figure 26: Calibration Complete Mode
The gas will be turned off and the unit will 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).
When there are ARGC errors, the user should check the ARGC and the sensor. The user
must recalibrate to remove the ARGC errors.
NOTE:
Once a new sensor has been calibrated using the ARGC, a simple calibrate
command from the display or HART is all that is required for future calibration.
Содержание S4000CH
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Страница 10: ...Model S4000CH 2 Figure 3 Sensor Remote Installation in inches Figure 4 ARGC Remote Installation ...
Страница 22: ...Model S4000CH 14 Figure 12 S4000CH Terminal Block Locations Figure 13 Remote Junction Box Terminal Block ...