Model 2000XTC Thermal Conductivity Analyzer

SKU: 2000XTC

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.

  • Brand


Teledyne Analytical TAI



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.


  • 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​


​Ranges ​Customer specified
​Accuracy ​± 2% of full scale at constant temperature
± 5% of full scale over 32° to 122°F (0° to 50°C)
​Response Time ​10-90% in less than 20 seconds (application and flow dependent)
​Temperature ​32° to 122°F (0° to 50°C)
​Sensor Type ​Silicon micro-machined thermal conductivity sensor
​Output ​4-20 mADC output signal, linear with the gas concentration
​Cell Material ​Nickel plated brass block, stainless steel tubing
​Load Impedance ​700 Ohms for current output (Max)
​Tube Connections ​1/4″ compression fittings
​Flow Rate ​Recommended between 0.4 to 2.0 SCFH
​Area Classification ​Intrinsically safe: Class 1, Div 1, Groups A, B, C and D
CENELEC / ATEX as per EEX ib IIC – T3 per EN 50020
​Power ​Requirements:     24 VDC
Consumption:      11 watts max
​Drift ​Zero:    Typically ± 1% over 48 hours
Span:   Typically ± 1% over 48 hours
​Mounting ​Interface Unit:       DIN rail mounting (UL 64 flammability rating)
Transmitter Unit:  Wall mounted, NEMA 4X (IP66 rated); flammability rating per UL 50; IEC                                       60529 and IP66
​Interface Unit ​Provided with transmitter


  • ​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​
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