Honeywell Midas-M Oxygen (O2) Sensor, 0-25% v/v, 3 years

Gas Measured	Oxygen (O2)
Cartridge Part Number	MMS-D2
Sensor Technology	3 electrode electrochemical cell
Measuring Range	O2	0% v/v to 25% v/v
Default Alarm 1	23.5% v/v (rising)
Default Alarm 2	19.5% v/v (falling)
Accuracy	<±0.2% v/v at 20.9% v/v O2
Response Time (t62.5)	Typical 11 seconds
Sensor Cartridge Life Expectancy	36 months under typical application conditions
Operating Temperature	0ºC to 40ºC (32ºF to 104ºF)
Effect of Temperature	Zero	TBA
	Sensitivity	<±0.2% of measured value/ºC
Operating Humidity (continuous)	15% RH to 90% RH
Effect of Humidity	Zero	Follows actual concentration of O2 present
	Sensitivity	(eg. 20.9% v/v @ 30% RH, 20.04% v/v @ 99% RH/40°C)
Operating Pressure	70 kPa to 110 kPa
Effect of Position	No effect in typical application
Long Term Drift	Zero	No drift
	Sensitivity	<5% signal loss over operating life
Calibration Gas	Oxygen (O2 20.9% v/v)
Challenge Gas (Bump Test)	Air mixture
Warm Up Time	< 30 minutes
Storage Temperature	5°C to 25°C (41°F to 77°F)

Cross Sensitivities

Each Midas-M sensor is potentially cross sensitive to other gases and this may cause a gas reading when exposed to other gases than those originally designated. The table below presents typical readings that will be observed when a new sensor cartridge is exposed to the cross sensitive gas (or a mixture of gases containing the cross sensitive species).

Gas / Vapor	Chemical Formula	Concentration Applied	Reading (%v/v O2)
Carbon Dioxide	CO2		Enhance O2 reading by 0.3% / % CO2
Hydrogen	H2	100% v/v	-9
Methane	CH4	100% v/v	No response
Nitrogen Dioxide	NO2	25 ppm in air	No response

Midas-M Sensor Cartridge Quick Reference Guide

Midas-M Oxygen Sensor Specifications