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 problems inherent in catalytic bead sensors. While catalytic LEL 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 interferants, which means greater measurement stability and longer sensor life.
D12-IR transmitters can be factory calibrated for volumetric methane measurements in special applications. Ranges from 0-10% to 0-100% by volume are available. A separate sensor is also available for high percent level measurements of heavier hydrocarbons such a butane and propane.
The D12-IR transmitter can also be configured with Infrared sensor for carbon dioxide (CO2) or nitrous oxide (N2O) detection. All sensor versions can operate in diffusion mode for ambient air or with a flow cell for pumped samples.
Because the IR sensor is always in an active state, the transmitter continuously monitors critical sensor functions and indicates any sensor problems, both on the display and via the analog output.
Transmitters are designed for operation in hazardous areas. The cast aluminum housing for the D12 transmitter is rated for Class 1, Division 1, Group B, C, D locations and is UL, FM, and CSA certified.
The transmitter is available with either HART™ or MODBUS™ protocol. The HART™ protocol supports the HART™ 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).