Breathing / Rescue Air Contamination Monitors

The dangers associated with breathing contaminated air are also well known and especially critical when using SCBA tanks in emergency situations.

Sigma Sensing has solutions for individual or multiple contaminant monitoring of breathing or rescue air.


Occupational Safety and Health regulations require procedures to ensure adequate quality of breathing air contained in breathing apparatus (SCBA).
SCBA is a device worn by rescue workers, firefighters, paramedics and others working for example on ships & oil rigs to provide breathable air in an immediately dangerous to life or health atmosphere (IDLH).


Sigma Sensing is offering for this purpose a fixed installation unit of the CAGP60-2D series with dual display that can monitor the correct levels of CO2 and CO in the air system. The unit which is designed for industrial applications is using a long life NDIR CO 2 sensor and an electrochemical CO sensor for this purpose.. The sensors monitors the air in ambient pressure as the compressed air pressure is reduced to ambient pressure for air sampling in a low pressure measurement chamber.
Version CAGP61-2D with an alarm beacon and the alarm setting freely configurable is also available.

Breathing Air Quality Monitor, Fireman CO2 protection, Scuba Diver protection 

Sigma CAGP60-D2 series Specifications


System max pressure: 16 bar
Sensor warm up time:   less than 1 minute
Sensor measuring range: 

CO2: 0 ~2000 ppm

CO: 0-50 ppm

Sensor operating principle:

CO2: Non-dispersive infrared (NDIR)

CO: Electrochemical -

Sensor repeatability:

CO2:  +-20 ppm

CO: +-1 ppm

Accuracy : 

CO2: ± 30 ppm ± 2% of reading

CO +-5% of reading

Sensor operating humidity: 0 - 95% RH, non-condensing
Sensor operating temperature: 10.....+50C (50.....+122F)
Gas sampling method: Diffusion
Sensor operating life expectancy:

CO2: 8 years in air

CO: 2 years in air

Recommended calibration interval: 12 months
Displays: 5 Digit, 0.56" (14 mm) LED
Power supply: 85 to 250 VAC Input Power
Current outputs (optional): 1 for each gas 4-20mA (linear)
Set points: 2 for each gas
Other outputs Optional
Other configurations: On request