Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1976-07-16
1977-11-15
Yasich, Daniel M.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
324 65R, 337403, 338 28, 340227R, 3402271, G01K 1100, G01R 2700, H01H 3776
Patent
active
040580148
ABSTRACT:
To detect and record the highest operating temperature range which occurs in an engine, transmission, implement hydraulic system or the like during an extended period of time, an indicator device is adapted to be mounted in thermal contact with a liquid coolant flow, lubricant flow or the like of the apparatus. The device has a housing containing a plurality of electrical resistor segments connected in series between an external electrode and the housing. A plurality of temperature-sensitive switches are arranged to short out successive ones of the resistor segments upon the occurrence of successively higher predetermined temperatures. The maximum temperature range which has been reached over an extended period of operating time may then be determined by using an ohmmeter to measure the electrical resistance between the electrode and the housing since the shorting out of successive ones of the resistor segments, upon the occurrence of successively higher temperature ranges, progressively reduces the electrical resistance in the circuit. The temperature-sensitiveswitches may be a series of springs each initially held in a compressed state by a body of wax wherein the spring expands to short out the associated one of the resistor segments upon melting of the wax and wherein the wax bodies associated with successive ones of the springs melt at progressively higher temperatures.
REFERENCES:
patent: 1148931 (1915-08-01), Rosenthal
patent: 1685136 (1928-09-01), Montgomery
patent: 2750482 (1956-06-01), Peterson
patent: 2765457 (1956-10-01), Stang
patent: 3044296 (1962-07-01), Boddy
patent: 3942467 (1976-03-01), Witonsky
Caterpillar Tractor Co.
Yasich Daniel M.
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