Indicating and control instruments

Details Indicating and control instruments Indicating and control instruments

1987-06-04

1988-09-06

Wayner, William E.

Automatic temperature and humidity regulation

Thermostatic

With indicator or alarm

165 111, 116216, G05D 2300, G01K 102

Patent

active

047687061

ABSTRACT:
An indicating instrument, for example a temperature controller, which is responsive to a parameter, such as temperature, of an associated system or apparatus comprises a first display arranged in an annular configuration and providing a visual indication of a set-point value of the parameter, a handwheel to adjust the set-point value to a different set-point value, and a second display providing a visual indication of an operating condition of the instrument or of the current value of the parameter. This second display is located within the annulus of the analogue set-point display. Preferably, the second display provides an indication of the difference between the current value of the parameter and the set-point value as shown by the marker. A series of LEDs may be used as the second display.

REFERENCES:
patent: 2786924 (1957-03-01), Kronmiller
patent: 3134086 (1964-05-01), Caddock et al.
patent: 4582251 (1986-04-01), Odom, Jr. et al.

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