Temperature control system

Details Temperature control system Temperature control system

1978-07-05

1980-04-22

Wayner, William E.

Automatic temperature and humidity regulation

Thermostatic

Hot and cold

73342, 165 28, 323 69, F24D 100, G05D 2324

Patent

active

041991028

ABSTRACT:
A temperature control system for monitoring and controlling a zone supplied with low-pressure steam is disclosed. The system utilizes a series of balanced Wheatstone bridges to provide a variety of automatic and manual control techniques to maintain temperature in the zone. Means are also provided to obtain direct readings of temperature, rate at which heat is being supplied, and the position and movement of a steam control valve which is utilized as a heat metering apparatus. The bridge leg outputs are permanently connected by high impedance coupling circuits which act as voltage dividers to obtain the required resultant control signals. High impedance coupling eliminates the need for control circuit balancing, thereby minimizing required calibrations in actual field use. The sole balancing calibration is with each sensor leg to a centered bridge leg.

REFERENCES:
patent: 2282442 (1942-05-01), Whitlock
patent: 2362977 (1944-11-01), Crosthwait, Jr. et al.
patent: 3054562 (1962-09-01), Werts

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