The Acme Gaspost toxic gassensor/transmitter measures the concentration of the target gas in an enclosed area and produces a proportional analog output signal. The 4-20mA transmitter is designed for standard 2-wire loop-powered operation where the output is supplied via the same pair of wires as the power supply. The four-wire version of the gaspost is available for all other output signals other than 4-20mA. The Gaspost employs a range of diffusion-type electrochemical sensors capable of detecting a broad range of toxic and combustible gases. It provides instantaneous detection of accuracy and trouble free operation.