Thermocouple failure detector

Details Thermocouple failure detector Thermocouple failure detector

1978-04-21

1979-08-28

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340652, G01R 3102, G08B 2100

Patent

active

041662431

ABSTRACT:
A circuit is provided for detecting an open condition in a thermocouple or thermocouple leads connected to a preamplifier even though the thermocouple is grounded or connected to ground through some resistance. A high frequency AC test signal is applied to both leads of the thermocouple and one of the leads is connected to a low pass filter. When the thermocouple circuit is closed, the AC signal on both leads will be substantially equal. If, however, either of the leads or the thermocouple itself is open, the AC signal will be different due to the low pass filter connected to one of the leads. That filter attenutes the signal on the associated lead as well as causing a phase shift of the two AC signals. A differential amplifier connected to the thermocouple leads detects the amplitude attenuation or the phase shift to provide an output whenever the thermocouple circuit is opened.

REFERENCES:
patent: 3066284 (1962-11-01), McKinley et al.
patent: 3229199 (1966-01-01), Mildner
patent: 3241061 (1966-03-01), Quittner
patent: 3468164 (1969-09-01), Sutherland
patent: 3590370 (1971-06-01), Fleischer
patent: 3755688 (1973-08-01), Hohler
patent: 3906341 (1975-09-01), Getz et al.
patent: 3973184 (1976-08-01), Raber

Affiliated with

Also associated with

Rating

Thermocouple failure detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thermocouple failure detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermocouple failure detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-769077