DC Current level detector for monitoring a pitot tube heater and

Details DC Current level detector for monitoring a pitot tube heater and DC Current level detector for monitoring a pitot tube heater and

1978-05-05

1980-06-10

Moffitt, James W.

Communications: electrical

Condition responsive indicating system

Specific condition

340640, 340655, G08B 2100

Patent

active

042075661

ABSTRACT:
A DC current level detector is provided for monitoring the heater current of a pitot tube. The detector includes a toroidal core defining a bore through which can be passed a line carrying the current to be detected whereby an amount of flux is generated in the core according to the current to be detected. A reference circuit is provided to generate in the core a reference amount of flux against which the first flux is compared in an algebraic combination. An oscillator circuit is inductively coupled to the core to saturate the core in opposite directions. The algebraic difference between the fluxes is employed to generate a signal to operate a relay. The relay is included in a circuit in which are connected a power source and an indicator such as an alarm lamp. The core is of toroidal shape and a casing is provided which houses the core along with the associated circuits and which is provided with an opening corresponding with the bore of the core. The line carrying the current to be detected or monitored is passed through the opening in the casing and through the bore of the toroidal core.

REFERENCES:
patent: 2785233 (1957-03-01), Stuart, Jr.
patent: 3005878 (1961-10-01), Wiegand
patent: 3774189 (1973-11-01), Brown
patent: 4037194 (1977-07-01), Boyden et al.

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