Carbon dioxide gas transmitter HCT 1000

H2hydrogenHe

Product overview
The HCT 1000 thermal conductivity transmitter (HydroTrans) is a flameproof enclosure transmitter designed for continuous gas concentration measurement in industrial process control. Packaged in a weatherproof housing with IP65 protection, it is intended for harsh and hazardous outdoor environments. The transmitter uses a solid-state thermal conductivity (TCD) sensor and can be configured for H2, He, N2, Ar, CO2 or other gases in binary or multi-component mixtures.

Sensor operating principle
The device measures target gas concentration by comparing heat transfer between a heated sensing resistor and an ambient reference resistor. The measurement relies on the thermal conductivity coefficient of the gas, producing a stable physical signal proportional to concentration.

Sensor description
The sensor integrates a heater on a thin electrical and thermal insulating membrane. Two thin-film resistors perform heating and temperature measurement on the membrane. Two adjacent compensation resistors on the silicon substrate correct for ambient temperature variations. Lighter-than-air gases (e.g., CH4) reduce the membrane temperature; heavier gases (e.g., CO2) increase the measuring resistor temperature.

Features

• Solid-state thermal conductivity sensor with long-term stability
• Physical, reference-gas-free measurement method
• Low power consumption suitable for field installations

Parameters / Product overview (key values)

• Model: HCT 1000
• Measurement principle: Thermal conductivity detector (solid-state TC sensor)
• Measurand / Parameter: Hydrogen % (configurable for H2, He, N2, Ar, CO2, others)
• Range: 0 – 10 %
• Accuracy: ±3 % FSD
• Resolution: 0.1 %
• Response time (T90): 3 s
• Flow rate requirement: approx. 1 l/min
• Operating pressure: 0.1 – 20 bar
• Gas temperature range: 0 – 50 °C
• Outputs: 4–20 mA, Alarm, RS232
• Supply voltage: 10–35 V
• Display: Graphical display
• Enclosure / Protection: Flameproof enclosure; IP65
• Connection: 6 mm
• Dimensions (W x H x D): 120 x 160 x 65 mm
• Weight: 2 kg

Standard Features

• Unique long-life solid-state TCD sensor design
• No reference gas required for operation
• Temperature-controlled TCD for excellent zero and span stability
• Flameproof enclosure certified for hazardous areas
• Robust, weatherproof housing for outdoor installation
• Linearized 4–20 mA output for process integration
• Compact footprint for space-constrained sites
• Simple installation and commissioning

Application Areas

• Power plants: H2 purity monitoring on turbine generator purge lines
• Petrochemical plants: H2 purity in recycle gas streams and tail gas treatment
• Air separation units: Bulk gas purity monitoring and cylinder verification
• Heat treating: Annealing furnace blanket gas monitoring
• Electrolysis: H2 analysis in O2 environments
• Fuel cell development: Feed gas purity and reformer efficiency testing

Technical specifications

• Model: HCT 1000
• Measurement principle: Thermal conductivity detector (solid-state TC sensor)
• Parameter: Hydrogen % (configurable)
• Range: 0 – 10 %
• Accuracy: ±3 % FSD
• Resolution: 0.1 %
• Response time (T90): 3 s
• Flow rate: approx. 1 l/min
• Pressure: 0.1 – 20 bar
• Gas temperature: 0 – 50 °C
• Outputs: 4–20 mA, Alarm, RS232
• Supply Voltage: 10–35 V
• Display: Graphical display
• Protection Class: IP65, flameproof enclosure
• Connection: 6 mm
• Dimensions: 120 x 160 x 65 mm
• Weight: 2 kg