 2A Thermocouple Data Sheet |
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| VACUUM SENSORS » 2A Thermocouple: (0 - 20,000 Microns) |
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2A Thermocouple
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Features:
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• Range: 0 to 20,000 microns.
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• Calibration Medium: Dry Air.
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• Dimension: 1-1/4 " diameter x 3" high.
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| • Operating Temperature: 1°C to 65°C. |
| • End connection: NPT, NW, CF, 3/8", and 1/2" VCO and VCR fittings. |
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The Model 2A Thermocouple Sensor tube consists of a tube containing a filament heated by the passage of a constant current. A thermocouple is welded to the center of this heated element thereby providing a means of directly measuring the element temperature in terms of voltage output. For any constant value of current through the filament, the temperature of the filament increases as the pressure in the tube is reduced. The thermocouple voltage is directly proportional to the increased temperature of the filament, and thus generates an increase in voltage. Sensitive circuitry includes the thermocouple output directly in microns. The standard sensor tube has nickel-plated, forged-brass housing which makes it capable of withstanding 150 psi overpressure. All thermocouple elements are preoxidized under controlled conditions to provide interchangeability of tubes without recalibration. This process also provides high stability and minimizes the effect of contamination. Stainless steel versions are available.
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