Alarm terminal device

Details Alarm terminal device Alarm terminal device

1983-09-23

1986-03-11

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340510, 340511, 340506, 340661, G08B 1900, G08B 2900

Patent

active

045757119

ABSTRACT:
An alarm terminal device has a lower limit voltage generator for generating as a lower limit voltage an analog signal which is produced from a temperature sensor and which is lower than a first predetermined value, and an upper limit voltage generator for generating as an upper limit voltage an analog signal which is produced from the temperature sensor and which is higher than a second predetermined value. At least one additional sensor is provided for generating an analog data signal having a voltage higher than the upper limit voltage or lower than the lower limit voltage so as to indicate any information other than that contained in the analog signal from the temperature sensor. A disconnection or a short circuit of a platinum resistor of the temperature sensor can thus be represented by the analog data signal to be quantized by an analog-to-digital converter employed in the sensor.

REFERENCES:
patent: 4282517 (1981-08-01), Wilson, Jr. et al.
patent: 4352087 (1982-09-01), Wittmaier
patent: 4394655 (1983-07-01), Wynne et al.
patent: 4414539 (1983-11-01), Armer

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