Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1982-07-06
1984-04-10
Makay, Albert J.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62127, 62 3, 62202, 236 94, 236 68B, 340515, F25B 4900, F25B 2102, G05D 2330
Patent
active
044413297
ABSTRACT:
A temperature control system including an enclosure defining a zone to be temperature controlled, a primary temperature conditioner for controlling ambient temperature within the zone, a temperature sensing mechanism for producing temperature signals dependent on localized temperature within the zone, a controller for controlling the primary temperature conditioner in response to the temperature signal, an error detector for monitoring the temperature signal and producing error signals in response to predetermined abnormal output conditions thereof, an auxiliary temperature conditioner disposed in close heat transfer relationship with the sensing mechanism and selectively energizable during test periods to substantially alter the localized temperatures sensed by the sensing mechanism without substantially changing the ambient temperature within the zone, and a fault detector for producing fault signals in response to given defective output conditions of the temperature signal during the test periods.
REFERENCES:
patent: 4122720 (1978-10-01), Podl
patent: 4283921 (1981-08-01), Prosky
patent: 4324138 (1982-04-01), Davis et al.
patent: 4364234 (1982-12-01), Reed
Jarcho Harold G.
Makay Albert J.
Tanner Harry
Toupal John E.
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