The Model 2000XTC Transmitter resets the standard for thermal conductivity detector based applications with the process control industry. As an intrinsically safe transmitter, packaged within a rugged, weatherproof housing, the 2000XTC is suitable for use in harsh, hazardous outdoor environments. Using a novel, solid-state thermal conductivity sensor, this cost effective transmitter can be configured to detect H2, He, N2 Ar, CO2 a number of other gases of or a number of other gases of interest in binary or multi-component interest in binary or multi-component sample gas mixtures.
Description
The sensor structure consists of an integrated heater located within a thin electrical and thermal insulating membrane. Two thin film resistors are used for heating and measuring the temperature of the membrane. Two resistors are integrated on the silicon beside the membrane for the compensation off the ambient temperature changes.
Features
• Stable long term operation
• Physical method for gas concentration measurement
• Low power consumption
• Small dimensions
Operating Principle
The thermal conductivity sensor measures the concentration of a specific gas between a hot surface resistor and an ambient temperature reference resistor using the thermal conductivity coefficient of the gas itself. Gases which have a lower density than air (CH4) cause a decrease on the surface membrane temperature. On the other hand, gases with densities heavier than air (CO2) increase the temperature of the measuring resistor.
• Ranges: contact factory
• 24 V power required
• Intrinsically safe; CENELEC / ATEX as per EEx ib IIC – T3 per EN 50020
• Configured to detect H2, He, N2, Ar, CO2 or a number of other gases of interest in binary or multi-component sample gas mixtures
• No reference gas requirements
• Temperature controlled TCD providing excellent zero and span stability over a wide temperature range
• Intrinsically safe design allowing for use in hazardous areas
• Robust, weatherproof housing suitable for outdoor installations
• Linearized 4-20 mA signal output
• 10 feet of interconnection cable
• Interface unit: DIN rail mounting (UL 64 flammability rating)
• Transmitter: Wall mount, NEMA 4x (IP66 rated)
• Small, space-saving, compact design
• Simple to install
• Instruction manual
• Power Plant: H2 purity analysis on turbine generator purge gas
• Petrochemical Plant: H2 purity analysis on H2 / HC recycle gas streams, redesulferization and tail gas treatment process
• Air Separation Plant: Bulk gas purity monitoring and welding/diving/cal gas cylinder verification
• Heat Treating: Annealing furnace blanket gas monitoring
• Electrolysis: H2 purity analysis in O2
• Fuel Cell Development: Methane feed gas purity analysis and reformer efficiency
