S4000C
21
described in Section 4.6.1. While the display is flashing the remaining sensor life estimate
during zeroing, apply the magnet to the GM Logo on the cover. The flashing number will
change to “
100
”, indicating the sensor has 100% of remaining sensor life. Complete the
calibration per Section 4.6.1.
4.7 Calibration Equipment
4.7.1 Portable Purge Calibrator
The portable purge calibrator is a compact, accurate and safe system containing a non-
explosive gas concentration. The lecture bottle is filled with a standard 50% LEL mixture of
gas/air. Using a known gas/air mixture reduces the likelihood of error in field calibration. The
hose and cup adapter included, allow for quick calibrations and gas checks.
Pre-mixed calibration gases at approximately 50% LEL are available, in lecture bottles, at 1200 psi,
8.3 MPa maximum pressure.
Hydrogen H
2
Methane CH
4
Propane C
3
H
8
Please specify the gas upon ordering. Spare bottles containing these gases may be ordered.
Methane and Hydrogen lecture bottles may be returned to General Monitors for refilling.