Honeywell Midas S2 Quick Reference Manual page 16

Install the sensor cartridge
1. Turn the power off.
2. Verify that the part number and type of sensor cartridge are
correct for your application, then remove the sensor cartridge
from the packaging. Remove the BiAS battery module and plug
caps from the sensor cartridge if needed.
3. Push the sensor cartridge gently until fully seated.
4. Confirm the display for gas type and concentration on the
screen.
NOTE: All sensor cartridges are supplied calibrated. Some sensor
cartridges can monitor for more than one type of gas. Please
refer to the User Manual for details about settings and
replacement.
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