Intelligent IR Combustible Gas Detector with SIL 3 Suitable Rating -- Hazardous Environments

LAKE FOREST, CA - May 30, 2007 - With microprocessor-based intelligence and a true-fail-to-safe design, the advanced IR2100 Infrared Point Gas Detector from General Monitors is now rated SIL 3 suitable. The IR2100 is designed for operation for application in the most demanding oil/gas production, chemical processing, wastewater treatment and other process industries where combustible gases pose a potential explosive threat to people, equipment and facilities.

The adoption of the SIL standard is increasingly widespread in the oil/gas, petrochemical and other process industries over the last 10 years in response to the development of safety equipment designed with next-generation electronics. SIL is a measure of process safety system performance, in terms of probability of failure on demand (PFD). This convention was chosen because it is easier to express the probability of failure rather than that of proper performance.

There are four discrete integrity levels associated with SIL: SIL 1, SIL 2, SIL 3, and SIL 4. The higher the SIL level, the higher the associated safety level, and the lower probability that a system will fail to perform properly. As the SIL level increases, typically the installation and maintenance costs and complexity of the system also increase.

IR2100 Combustible Gas Detector
The IR2100 Detector is an infrared point hydrocarbon gas detector that is suitable for SIL 3 applications, has the CE Marking, and is certified by FM, CSA, ATEX, and GOST. The highly intelligent IR2100 continuously monitors hydrocarbon gases and vapors within the lower explosive limit (LEL). It features a true fail-to-safe operational design for superior performance without relying on a sintered flame arrestor, which can clog and degrade performance.

The IR2100's gas detector sensor measures the absorption of IR radiation passing through gas using a dual beam, single-detector method of operation. The IR detector measures the intensity of two specific wavelengths: one at a reference absorption wavelength and the other outside of the absorption wavelength. The combustible gas concentration is determined by comparing these two values.

The IR2100's gas detection sensor features heated IR optics, which eliminate condensation for superior detection reliability. Its microprocessor logic also allows it to discriminate between dirty optics that require cleaning and other potential faults. The detector operates with a 4-20mA analog output that is proportional to 0 to 100% LEL gas concentration.

All electronics are contained within an explosion-proof housing so that the IR2100's detector information can be processed locally. RS-485 serial communications are MODBUS RTU compatible. The RS-485 output provides status, alarm, fault and other information for operation, troubleshooting, and maintenance of the unit.

GM SIL Resource Center
As part of its commitment to plant safety, SIL and the industries that it serves, General Monitors has developed a highly informative Safety Integrity Level (SIL) Online Resource Center that is located at: The in-depth, online SIL Resource Center continues General Monitors' over 45 year history of focusing on customer problems by offering a diverse set of industry leading safety solutions.

About General Monitors
Founded in 1961, General Monitors is a leading-edge manufacturer of combustible gas, toxic gas and flame detection monitoring products and systems of the highest quality and reliability. The company is third-party certified to ISO 9001:2000 requirements. Corporate headquarters in Lake Forest, California, comprise a modern engineering design center, R&D, manufacturing, sales, and a service complex. A facility in Galway, Ireland, supports the EU with engineering design, R&D and manufacturing. Sales and service offices are maintained in Houston, Texas, Singapore, the United Arab Emirates, and the United Kingdom.

Company Contact: Angela Sauceda, Marcom Mgr o Tel: 949-581-4464 o Email:

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Web: o Tel: 1-800-330-9161 o Tel: 949-581-4464 o Fax: 949-581-1151
Company Address: General Monitors o 26776 Simpatica Circle, Lake Forest, CA 92630

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