unitized transmitter u8700h transmitter controller

Unitized Combustible Gas Transmitter / Controller U8700H

The U8700H is a unitized combustible gas transmit- ter/controller that operates in conjunction with a cat- alytic sensing element to continuously monitor the environment for the presence of combustible gases and vapors. The system operates in the range of 0 to 99% LFL (lower flammable limit) and responds to a variety of combustible gases. All electronic circuitry and status indicators are housed in a metal enclo- sure, for location at the area of detection.

Depending on the application, the U8700H can func- tion as a transmitter and/or a single channel con- troller. The transmitter output signal is a linear 4 to 20 ma dc current, which corresponds to 0 to 99% LFL concentrations of the gas being detected (standard output). A set of three SPST relay contacts can also be ordered for direct control of external equipment by the U8700H.

LEDs located on the faceplate are illuminated to pro- vide a visual indication when the level of gas exceeds either of two field adjustable alarm setpoints. A digital display indicates the level of gas being detected and uses a numerical code to identify system status.

Fault detection circuitry continuously monitors for proper operation. If a malfunction is detected, the cur- rent output drops to less than 1.0 ma.

Category: Explosion Proof Lighting