Model 2000A Thermal Conductivity Analyzer

SKU: 2000A

The Series 2000 represents a complete line of Thermal Conductivity Detector (TCD) based analyzers which can be applied in a wide range of applications and industries. By using field proven filament-based and semiconductor based TC detectors, Teledyne is able to continuously monitor hydrogen and a variety of other gases of interest in either binary or multi-component sample gas streams.

  • Brand


Teledyne Analytical TAI


Series 2000 Platform

To contend with the numerous and varied analyzer requirements among industrial users, Teledyne has developed a feature rich, user-friendly platform. The Series 2000 comes with a standard software program incorporating such flexible features as (3) user-programmable ranges, automatic calibration, and customer selectable gas constituents.

Thermal conductivity is a basic property of gases that relates to their ability to conduct heat. Good conductors of eat such as H2 and He, have a high thermal conductivity whereas poor conductors of heat, such as CO2 and Ar, have low values. This ability to conduct heat forms the basis of detection. The Series 2000 analyzes gas compositions by continuously comparing the sample gas with a reference gas (sealed or flowing) of known thermal conductivity. This comparison is performed in a 2 chamber detector cell block. Reference gas occupies one chamber and sample gas the other.​

A pair of temperature-sensitive heated filaments is mounted in each chamber. These filaments are part of a Wheatstone Bridge circuit. Should the sample gas composition change, its thermal conductivity will also change, conducting different amounts of heat away from the sample gas filaments. Since the resistance of the filaments is a function of their temperature, the resistance changes when the sample gas changes.

Any such change results in an imbalance in the Wheatstone Bridge, resulting in an electrical signal proportional to the change. Since the temperature of the filaments is tightly temperature controlled, the Series 2000 provides an accurate measure of any change in the sample gas composition. Teledyne offers this cell design in a variety of wetted parts to contend with corrosive gas streams typically found within the hydrocarbon processing industry.

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.


  • ​C        Integrally mounted auto-calibration valving
  • H       Stainless steel cell block with gold filaments (for gas streams with H2S)
  • K       19″ rack mount for 2000A
  • L        Gas selector panel for sample and cal gas selection and flow control
  • N       220 VAC operation
  • R       Sealed reference (for filament-based TCD)


  • Three ranges plus cal range, field selectable application dependent, Auto Ranging
  • Flush panel mount configuration
  • Isolated 4-20 mADC and 0-1 VDC signal outputs and range ID contacts
  • Programmable Auto Calibration Capability
  • Five digit gas concentration LED display and separate back-lit 2 x 20 line alpha numeric vacuum fluorescent display for analyzer set-up / readout
  • Nickel-plated brass cell-block with nickel alloy filaments and stainless steel end plates
  • Self-diagnostics with Form C Failure Alarm Relay
  • Two fully programmable concentration alarm set points and corresponding Form C + Failure Alarm Relay
  • Linearizer: automatically linearizes the signal over the ranges and gases desired for analysis, and is programmed to provide 110 customer selectable gas combinations
  • Bi-directional RS-232 serial digital port for use with a computer or other digital communication device
  • 110 VAC or 220 VAC, 50/60 Hz (Specify at time of order)​


​Mounting ​Panel
​Area Classification ​General purpose, optional FM approved for Class 1, Div 2. No Purge version available
​Ranges ​Three ranges plus a cal range, field selectable within limits (application dependent) and auto ranging
​Display ​Backlit 2 line alphanumeric LCD; 5 digit LED display
​Accuracy ​± 1% of full scale for most binary mixtures at constant temperature
± 5% of full scale over operating temperature range once temperature equilibrium has been reached
​Response Time ​90% in less than 10 seconds with a flow rate of 100 sccm
​Temperature ​32° to 122°F (0° to 50°C)
Sensor Type ​Standard TC cell (4-filament detector)
​Signal Output ​Two 0-1 VDC (concentration and range ID)
Two 4-20 mADC isolated (concentration and range ID)
​Alarm ​Two fully programmable concentration alarm set points and corresponding Form C, 3 amp contacts
One system failure contact to detect power, calibration, zero / span and sensor failure
​Cell Material ​Nickel plated brass block with nickel alloy filaments and stainless steel piping and end plates
​O/P Interface ​Full duplex RS-232
​Max Load Impedance ​1000 ohms
​Reference Gas ​Sensor selection dependent. Semicon-based = sealed
Filament-based = flowing or sealed (app. dependent)
​Tube Connections ​1/4″ compression fittings, 6 mm adapters optional
​Wetted Parts ​Stainless steel, nickel and gold (gold filament option)
​Sample Gas Flow Rate ​Recommended 0.1 to 0.4 SCFH
​Power Requirements ​110 VAC, 50-60 Hz (220 VAC optional)
​Zero/Span Drift ​± 1% of FS
​Pressure ​5-50 psig


Air Separation

  • ​Bulk gas purity monitoring
  • Gas mixture blending
  • Breathable diving gases
  • Calibration gas blends
  • Specialty gas cylinders for SF6, laser gas mixtures, etc.​

Petrochemical and Refinery

  • H2 purity monitoring in recycle gas streams
  • Redesulfu​rization​ process
  • H2 reformer process
  • Tail gas treatment units
  • HYCO Syngas monitoring
  • UOP (CCR) N2 header, lift gas H2 / HC safety analysis

Turbine Generators

  • ​Hydrogen purity analysis of purge cooling gas in the turbine generator housing to detect possible seal leaks

Nuclear Power Generation

  • Hydrogen detection in the Containment Building in the event of a loss of coolant accident (LOCA) or steam line break (SLB)

Steel / Heat Treating

  • ​Annealing furnace blanket gas monitoring
  • Blast furnace monitoring
  • Basic oxygen monitoring for process control purposes
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