The QIRF Freon gas detectors are the second generation of QEL proprietary designed transmitter/sensors. They are configured easily to meet the International Mechanical Code, ASHRAE 15, and B52 requirements. These transmitters were engineered to address the deficiencies inherent with solid-state sensors. Infrared technology facilitates specific gas type Freon detection without any cross-sensitive interferences. Its sensing technology is a non-contact, nondepleting form of concentration measurement that has a sensor life of over ten years. Standard equipment includes a digital display, three user configurable relays, buzzer, horn/strobe output and non-intrusive calibration. Sensor housings are thermally controlled at elevated temperatures to eliminate errors due to condensate formation and from temperature fluctuations allowing operation in temperatures from -45ºC to +65°C. Each unit can be connected to either the M-Controller or Q4C controller through RS-485 digital communication allowing for cost effective wiring installation. Equally the transmitter is available with 4-20 mA , and Modbus outputs to any Building Automation System(BAS). Controllers can be equipped with internal and external horns and strobes to alert personnel prior to entering the hazardous area. Both the M-Controller and Q4C are available with M-Net and M-Logger which allows remote monitoring, notification, programming and datalogging features. NEMA 4X enclosures are standard. Calibration procedures are straight forward, non-proprietary and can be performed by any competent technician. Consult the factory for specific gases.
The concentration of Freon is measured by determining the amount of absorption of light in a specific frequency band. Most gases have their unique characteristic spectra in the infrared band . Those spectra are derived from the molecule's composition in such a way that no two molecular gases have the same IR spectrum. IR spectra are the fingerprints of gases, and thus allow gases to be uniquely identified. By transmitting a beam of IR radiation through the air, or through any particular gas volume, and recording how much is transmitted at selected spectral lines, one can determine the gas and its concentration. This is a standard and well-proven principle, routinely used in laboratory analysis of chemical species. An IR detector is essentially a temperature sensor and is, therefore, potentially very sensitive to changes in ambient temperature. Our IR-FREON smart sensors are entirely electronic with no moving parts. They are built around our unique QT temperature-controlled Gas Sample Cell with an integrated IR Source and IR Detector. This allows the operating temperature range to span from -45C to +65C eliminating errors due to condensation and ambient temperature fluctuations. Heavier gases tend to pool on the floor so an available sample pump is recommended to sample these heavier gases.