GE XMTC-62-11-0 Panametrics XMTC Thermal Conductivity Transmitter

 

 

The microprocessor-based Panametrics XMTC is a compact, rugged, fixed thermal conductivity transmitter that measures the concentration of binary gas mixtures containing hydrogen, carbon dioxide, methane or helium. The Panametrics XMTC Thermal Conductivity Binary Gas Transmitter also combines computer enhanced signal measurement with fast-response software, real-time error detection and digital communication via an RS232 or RS485 interface.

• Accuracy: ±2% of span
• Linearity: ±1% of span
• Repeatability: ±0.5% of span
• Zero stability: ±0.5% of span per week
• Span stability: ±0.5% of span per week
• Response time: 20 seconds for 90% of step change
• Isolated 4 to 20mA analog output
• Requires 24VDC
• Measurement range: 0-100%
• Ultra-stable glass-coated thermistors
• Single or dual gas push-button calibration
• Type 4X/7 construction; ATEX, FM and CSA certified for Class I, Division 1 hazardous areas
• T6 rating for temperatures up to 149 degree F 65 degree

Two ultrastable, precision glass-coated thermistors are used-one in contact with the sample gas and the other in contact with the reference gas (such as air in a sealed chamber). The thermistors are mounted so that they are in close proximityto the stainless steel (or Hastelloy®) walls of the sample chamber. The entire transmitter is temperature-controlled, and the thermistors are heated to an elevated temperature in a constant-current Wheatstone bridge. The thermistors lose heat to the walls of the sample chamber at a rate that is proportional to the thermal conductivity of the gas surrounding them. Thus, each thermistor will reach a different equilibrium temperature. The temperature difference between the two thermistors is detected in the Wheatstone bridge, and the resulting bridge voltage is amplified and converted to a linear 4 to 20 mA output proportional to the concentration of one of the constituents of the binary or pseudo binary gas mixture.

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XMTC-62-11-0

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