Pressure/temperature probe
First Claim
1. An improved pressure/temperature measuring apparatus comprising:
- a remote measuring probe having a metal tubular sheath including a lower end, said probe having an electrical resistance-type pressure sensor mounted in said sheath and an electrical resistance-type temperature sensor mounted in said lower end of said sheath, said sensors electrically connected in series;
a measurement site distant from said remote probe having a constant direct current source connected to said remote probe, first electrical means for determining the temperature of said temperature sensor to provide a temperature reading at said temperature sensor, second electrical means for determining the pressure at said pressure sensor to provide a pressure measurement at said pressure sensor and third electrical means for determining the temperature of said pressure sensor from a measurement of said pressure sensor after calibration calculation procedures of said pressure sensor to thereby permit the temperature correction of said pressure sensor; and
electrical connector means connecting said first, second and third electrical means and said direct current source to said sensors in said remote probe.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved pressure/temperature probe whose accuracy will not be affected by the pressures and temperatures to which it is subject or by the resistance of the connecting cables. The probe includes a separate pressure transducer and temperature transducer which are connected in series to a constant current source. In addition to the pressure reading taken by the pressure probe, a temperature reading of the pressure probe is derived from the pressure probe. This temperature reading provides the actual temperature of the pressure probe and permits highly accurate temperature correction. The pressure probe is constructed and arranged so as to have a high thermal time constant while the temperature probe is constructed and arranged to have a low thermal time constant.
35 Citations
7 Claims
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1. An improved pressure/temperature measuring apparatus comprising:
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a remote measuring probe having a metal tubular sheath including a lower end, said probe having an electrical resistance-type pressure sensor mounted in said sheath and an electrical resistance-type temperature sensor mounted in said lower end of said sheath, said sensors electrically connected in series; a measurement site distant from said remote probe having a constant direct current source connected to said remote probe, first electrical means for determining the temperature of said temperature sensor to provide a temperature reading at said temperature sensor, second electrical means for determining the pressure at said pressure sensor to provide a pressure measurement at said pressure sensor and third electrical means for determining the temperature of said pressure sensor from a measurement of said pressure sensor after calibration calculation procedures of said pressure sensor to thereby permit the temperature correction of said pressure sensor; and electrical connector means connecting said first, second and third electrical means and said direct current source to said sensors in said remote probe. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification