ATI's Series D12 Gas Transmitter line now includes a versatile infrared system that can be configured for LEL or select toxic gases. The D12-IR utilizes a compact IR sensor in a corrosion resistant housing with sintered flame arrestor to meet hazardous area classification requirements, and is suitable for most plant environments.
The D12-IR gas transmitter eliminates the poisoning inherent in catalytic bead senors. While these gas detection sensors offer reliable service, the presence of silicon vapors, hydrogen sulfide, and halogenated hydrocarbons can quickly degrade sensor performance. Infrared sensing technology is not susceptible to these potential interferents. This means the gas sensors will have a longer life and provide gas measurement stability.
D12-IR gas transmitters can be factory calibrated for volumetric methane measurements in special applications. The infrared gas transmitters are available by volume in ranges 0-10% to 0-100%. A separate gas sensor is also available for high percent level measurements of heavier hydrocarbons such as butane and propane.
The D12-IR gas transmitter can also be configured with infrared sensors for carbon dioxide (CO2) or nitrous oxide (N2O) gas detection. All gas detection sensor versions can operate in diffusion mode for ambient air or with a flow cell for pumped samples.
Because the IR gas sensor is always in active state, the infrared transmitter continuously monitors critical sensor functions and indicates any sensor problems, both on the display and via the analog output.
Gas transmitters are designed for operation in hazardous areas. The cast aluminum housing for the D12 gas transmitter is rated for Class 1, Division 1, and Group B, C, D locations, and the gas transmitter is UL, FM, and CSA certified.
The D12-IR gas transmitter is available with either HART™ or MODBUS™ or protocol. The HART™ protocol supports the Universal and Common Practice Commands at 1200 baud using the Bell 202 FSK modem standard. The MODBUS™ protocol supports 9600 baud access to concentration and status information, and supports alarm setup and many other functions on either RS485 or RS232 (software selectable).