The ACME CEL4 Series is a microprocessor-based up to 4 channel multi-gas detection and control system that can be used with a wide variety of ACME toxic, combustible & oxygen gas sensors. The sensors can be grouped in any combination. The wiring between the Control Panel and the remote sensors is accomplished by a 4-wire “daisy-chain”. The LCD provides a digital readout of gas concentrations and ON-OFF output level status for each channel as well as system error codes. This unit provides the functionality of our CEL 32-point control panel in a smaller package.