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Model IR15 -Dual Gas Infra-Red Sensors
Infrared Dual Gas Sensor for Hazardous Environments (Portable and Fixed Systems) The SGX infrared sensors use the proven Non-Dispersive Infrared (NDIR) principle to detect and monitor the presence of gases. With an infrared source and specific filtering on the pyroelectric detectors mounted inside the optical/gas cavity, individual gases or types of gas can be identified and their concentrations determined. These sensors are suitable for reliable monitoring of gas levels in general safety applications where the sensor size is restricted and require a flameproof enclosure for hazardous environments. The IR15 Series contain two active detector elements for simultaneous monitoring of Carbon Dioxide and Methane or Hydrocarbon mixtures in the same size housing as some of the single gas sensors from the IR1xxx series sensors, making the sensor more cost effective than two separate sensors.
- Oil & Gas
- Petrochemical
- Biogas
- Wastewater
- Utilities
- Steelworks
- Confined Space Entry
- Indoor Air Quality
- For detection of the following gases:
- Carbon Dioxide & Hydrocarbons,
- Hydrocarbons Mixtures
- Gas concentration ranges:
- 0 - 5% Carbon Dioxide
- (also suitable for 0 to 0.5%v/v)
- 0 - 100% Carbon Dioxide
- (also suitable for 0 to 10%)
- 0 - 100%v/v Hydrocarbons
- (also suitable for 0 to 100%LEL)
- 19mm sensor height
- Embedded thermistor for improved temperature
- compensation
- Diffused gas sampling via mesh
- Low power
- Reference channel for self-compensation
- Special gold plated optical gas cavity for stable signal
- levels
- Operational in varying temperature, pressure and
- humidity
- Fast response
- Rugged stainless steel construction
- No moving parts
- Immunity from ‘poisoning’
- Reliable fail-safe operation
- Certified: ATEX, IECEx, CSA and UL
To operate, the sensors must be interfaced to a suitable circuit for power supply, output amplification and signal processing. Sensor outputs require linearisation and compensation for ambient temperature variation using algorithms in the system firmware. This is necessary for sensors to meet their full performance specification. An embedded temperature sensor facilitates this compensation on certain types. Further compensation for pressure changes can also be made in an algorithm, provided there is a suitable input from a pressure sensor. A set of Application Notes is available from the SGX Sensortech Ltd website, to explain more about NDIR gas sensing and provide advice for the end-user on interfacing the sensors and processing signals.