STAND-ALONE GAS DETECTOR TRANSMITTER Gas Tech, Inc.: Single-gas, nondisplay transmitter available for a variety of combustible gases. May be connected to Gas Tech controller, a programmable logic controller, or distributive control system. Available as three-wire transmitter for combustible gases or two-wire loop-powered transmitter for toxic versions. Calibrations and zero adjustments accomplished with potentiometer. (877) GAS-TECH.