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HCT 1000

Thermal Conductivity Transmitter

The Model HCT 1000 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 costeffective 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.

Parameters Hydrogen %
Method

Thermal conductivity

ATEX No
SIL No
Range

0 – 10 %

Accuracy

+/- 3 % FSD

Response time T 90

3s

Output

4 – 20 mA
Alarm
RS232

Supply Voltage

10 – 35V

  • Description
  • Specifications
  • Standard Features
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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.   Features

  • Stable long term operation
  • Physical method for gas concentration measurement
  • Low power consumption
Parameters Hydrogen %
Method

Thermal conductivity

Range

0 - 10 %

ATEX No
SIL No
Accuracy

+/- 3 % FSD

Resolution

0,1 %

Flow rate ca. 1 l/m
Pressure 0,1 - 20 bar
Calibration

Calibration Gas

Response time T 90

3s

Gas temperature 0 - 50 °C
Output

4 - 20 mA
Alarm
RS232

Supply Voltage

10 - 35V

Display

Graphical Display

Protection Class IP 65
Connection 6 mm
Dimensions 120 x 160 x 65
Weight 2 Kg
  • Unique, long-life, solid-state, TC sensor design
  • No reference gas requirements
  • 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
  • Simple to install
  • 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

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