3M 3MTM quick start Toxic Gases, Carbon Dioxide Gas, Toxic and Carbon Dioxide Zero Calibration

Toxic Gases

The following toxic gases table displays a quick overview of the ranges and the gases needed to perform zero and span calibrations.

Type of Gas	Range			Res.	Zero cal	Span cal
					gas	gas
Carbon Monoxide (CO)	0	-1000 ppm		1 ppm	nitrogen/pure air	CO
Chlorine (CL2)	0.0	- 20	ppm	0.1 ppm	nitrogen/pure air	CL2
Ethylene Oxide (EtO)	0.0	- 20	ppm	0.1 ppm	nitrogen/pure air	EtO
Hydrogen Cyanide (HCN)	0.0	- 50 ppm		0.1 ppm	nitrogen/pure air	HCN
Hydrogen Sulfide (H2S)	0	- 500 ppm		1 ppm	nitrogen/pure air	H2S
Nitrogen Dioxide (NO2)	0.0	- 50 ppm		0.1 ppm	nitrogen/pure air	NO2
Nitric Oxide (NO)	0.0	- 100 ppm		0.1 ppm	nitrogen/pure air	NO
Oxygen (O2)	0.0	- 30%		0.1%	nitrogen	Room air
					*1.0 L/min. flow rate	*span 20.9%
Sulphur Dioxide (SO2)	0.0	- 50 ppm		0.1 ppm	nitrogen/pure air	SO2

Carbon Dioxide Gas

Similar to toxic gases, the carbon dioxide sensor should be calibrated prior to logging.

Toxic and Carbon Dioxide Zero Calibration

Depending on the gas of interest, the toxic zero calibration is performed with the gas indicated in the table above. The CO2 sensor requires a calibration gas, a regulator with at least 1.0 Liter/minute flow rate, and a hose/tubing. Nitrogen (N2) is the recommended gas for a zero calibrating (If you are not applying a gas, start at step 2.)

1.	Connect the appropriate gas/pure air, regulator, tubing, and cal. cup to the EVM.
2.	Select Calibration from the Start screen and choose a specific toxic using	keys. (i.e., CO).

3.Press Cal softkey and then press Zero softkey. Once level is stabilized, press Set softkey. (Allow at least 90 seconds to stabilize.)

4.Press Save or Cancel softkey to store the process. Disconnect components and return to the start screen via On/Off/Esc key.

Cal. cup/adapter	Tubing
	Regulator
	Cal. gas source