Development of an Engine Coolant Thermostatic/Pressure Switch
Final rept. Jul 1989-Feb 1991
ARMY TANK-AUTOMOTIVE COMMAND WARREN MI
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Military vehicle engine cooling systems are frequently pressurized in order to raise the operating temperature of the coolant above the ambient boiling temperature. System pressure can be lost due to a defective radiator cap or any other pressure leak. Undetected loss of pressurization renders a vehicle unusable due to loss of coolant from boiling. Such engines are often equipped with a dashboard mounted over-temperature warning light which is activated by a thermostatic switch such as is described in MIL-S-12285. This type of switch does not provide warning of loss of pressurization. This report describes the development of a thermostaticpressure switch designed to warn of both coolant over-temperature conditions as well as loss of cooling system pressurization. The program involved the detailed design, qualification testing, and manufacture of preproduction thermostaticpressure switches as well as preparation of a draft revision to MIL-S-12285.
- Electrical and Electronic Equipment