Hydro-TransThermal Conductivity TransmitterProcess Online Gasanalyzer The Model HydroTransmitter resets the standard for thermal conductivity detector-based applications within the process control industry. As a flameproof enclosure transmitter, packaged within a rugged, weatherproof housing, the HydroTrans 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 or a number of other gases of interest in binary or multi-component sample gas mixtures. © Features of the analyzer • Unique, long-life, solid-state, TC sensor design • Temperature controlled TCD providing excellent zero and span stability over a wide temperature range • Flameproof enclosure design allowing for use in hazardous areas • Robust, weatherproof housing suitable for outdoor installations • Linearized 4-20 mA signal output • Small, space-saving, compact design © Applications • Power plant: H2 purity analysis on turbine generator purge gas • Petrochemical plant: H2 purity analysis on H2 / HC recycle gas streams, redesulfurization, and tail gas treatment processes • 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 © Sensor 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. © Sensor description The sensor structure consists of an integrated heater located on 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 of the ambient temperature changes. 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. • Stable long term operation • Physical method for gas concentration measurement

Ranges: Accuracy: Customer specified ±2% of full scale at constant temp; ±5% of full scale over 050° C Response time: 10-90% in less than 30 seconds with a flow rate of 300 ccm Instrument is warranted for 1 year against defects in material or workmanship NOTE: Specifications and features will vary with application. The above are established and validated during design, but are not to be construed as test criteria for every product. All specifications and features are subject to change without notice. System operating temperature: Sensor type: Silicon micro-machined thermal conductivity sensor...