Zeroing the Sensors

To zero the sensors, refer to steps #1-3 in Connecting to the IR Link.

Table 1. Gases Monitored

Gas Detected	Unit of Measure
Hydrogen sulfide (H₂S)	parts per million (ppm)
Carbon monoxide (CO)	parts per million (ppm)
Oxygen (O₂)	percent by volume (%)
Combustible gases (LEL) Field selectable for:	1. percent of lower explosive limit (% LEL) 2. percent by volume methane 0-5.0% v/v