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.
Breathing Air Carbon Dioxide (CO2) Contamination Monitor
Normal CO2 levels outdoors (i.e. 200 – 400 ppm) or indoors (i.e. 500 – 2,500 ppm) are not considered hazardous. However, compressed air with CO2 levels that are within the “indoors range” can create problems in Self-Contained Breathing Apparatus (SCBA) applications. Some compressors might be equipped with filters to reduce CO2 levels. CGA G-7.1 lists a 1,000 ppm maximum for Grade D and a 500 ppm maximum for Grade E air. High CO2 levels in SCBA tanks can produce many of the same symptoms as CO poisoning. In addition, high CO2 levels increase breathing rates, which shorten SCBA usage time. One of the most common causes of SCBA air quality failures is excessive CO2 content.
Sigma 95H-WH-B-A
for continuous monitoring of multiple gases
Sigma Sensing is offering for this purpose a fixed installation unit of the Sigma95H-B series with display that can monitor the correct levels of CO2 and CO (NOx optional) 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 monitor 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 Sigma 95H-B-A with an alarm beacon and the alarm setting freely configurable is also available.
Breathing Air Quality Monitor, Fireman CO2 protection, Scuba Diver protection
Sigma 95H-B series Specifications
| System max pressure: | <15 bar |
| Response time | ≤30 seconds (T90) |
| Sensor measuring range: | CO2: 0 ~2000 ppm
CO: 0-50 ppm |
| Sensor operating principle: | CO2: Non-dispersive infrared (NDIR)
CO: Electrochemical – |
| Accuracy : | ≤±5%F.S. (higher accuracy optional) |
| Sensor operating humidity: | 0 – 95% RH, non-condensing |
| Sensor operating temperature: | -20…..+50C |
| Gas sampling method: | suction pump |
| Sensor operating life expectancy: | CO2: 5 years in air
CO: 18-24 months in air |
| Recommended calibration interval: | 12 months |
| Display: | 2.4-inch color display, resolution 320*240 |
| Display content: | gas molecular formula, concentration, unit, pump status, etc. |
| Power supply: | 12-24V DC |
| Current outputs (for one sensor): | 4-20mA |
| Relay output: | 1 |
| Other outputs | RS485 |
| Alarm mode: | buzzer, alarm status prompt on the display screen, high and low alarm values can be set by end user. |
| Protection rating: | IP65 |
| Other configurations: | On request |