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ACME Engineering CEL-LS Megaset


The ACME MegaSet series is a microprocessor-based multipoint multigas detection and control system that can be used with the GasPost sensors. The communication between the Control Panel and the remote GasPost sensor-transmitters is accomplished through a true RS485 daisy chain network.

The versatility of the multipoint multigas detection system allows the user to customize the system parameters (ON-OFF level setpoints, time delays, hysteresis, scan rate, sensor type and range, etc.) via a removable keyboard and LCD screen. The menu-driven options appear in plain English for easy field-programming. The LCD display provides a continuous digital read-out of gas concentrations for each sensor-transmitter, as well as levels status (LOW, HIGH & ALARM), the battery voltage and the time elapsed in minutes since the last transmission.

In its most basic configuration, the Megaset multipoint multigas detection Control Panel supports up to 256 channels where each channel is treated independently controlling a fan zone. In this configuration each channel has a set of relay outputs for Low, High and Alarm levels and/or a 4-20 mA signal proportional to the gas concentration. In a more practical application, the channels are divided into groups that collectively serve various fan zones. In the latter configuration each group (zone) has a set of relay output contacts and/or 4-20mA signal proportional to the demand from that group.

The CEL-LS also has an optional BACnet IP interface. This option provides a read/write option that is unmatched. This option provides full visibility of all network points and allows users to operate peripheral devices, such as fans, by using the override commands from the Building Management System (BMS).



  • Proven RS-485 data communication technology for up to 256 addressable remote sensor-transmitters & up to 96 addressable remote relay modules.
  • Relay outputs from the Control Panel or from Remote Relay Modules.
  • 4-20mA output to control VFD’s
  • Fan On / Fail status cofirmation signals.

Typical Wiring Diagram: