Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1982-12-01
1985-12-03
Cangialosi, Salvatore
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
376247, G01K 700, G21C 1700
Patent
active
045563292
ABSTRACT:
A resistor temperature device (RTD) trip unit is described. The RTD monitors thermal conditions at an industrial process location, such as in a nuclear reactor. Resistance of the RTD varies in accordance with temperature at the monitored process location. An amplifier circuit produces an output signal, corresponding to the variations in RTD resistance, which signal operates a plurality of relay circuits. The relay circuits variously report process conditions such as failure, the obtaining of a preselected level, etc. Additionally, metering provides a continuous analog indication of thermal conditions at the monitored process locations. To correct for non-linearity inherent in the RTD resistance slope, a recursive feedback path is coupled between the RTD amplifier stage and an RTD current source, such that a decreasing resistance slope produces a complementary increase in current supply to the RTD. The result is a linear output signal from the RTD amplifier.
REFERENCES:
patent: 3766781 (1973-10-01), Roberts
patent: 3810138 (1974-05-01), Thompson et al.
patent: 3848466 (1974-11-01), Dial et al.
patent: 3880006 (1975-04-01), Poduje
patent: 3892281 (1975-07-01), Brown
patent: 4102199 (1978-07-01), Tsipovras
patent: 4300392 (1981-11-01), Bloomer et al.
Benson Michael R.
Hill William D.
Cangialosi Salvatore
General Electric Company
James, Jr. Ivor J.
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