Acme Engineering Prod. Ltd.

- Model CEL-LS Series - Microprocessor-Based Multipoint Multi-Gas Detection and Control System

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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).

The ACME CEL(LS) MultiSet series is a microprocessor-based multipoint multigas detection and control system that can be used with a wide variety of toxic, combustible, refrigerant & oxygen gas sensors. The sensors can be grouped in any combination. The wiring between the Control Panel and the remote sensor-transmitters is accomplished via 4-wire 'low voltage' 'daisy-chain'.

The versatility of the 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 keypad and LCD screen. The password-protected menu-driven options appear in plain English for easy field-programming.

The LCD provides a continuous digital read-out of gas concentrations for each sensor-transmitter, as well as On-Off output level status (LOW, HIGH & ALARM).

In its most basic configuration, the MultiSet 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 MultiSet series Sensor-Transmitters are available with different sensor technologies depending on the type of gas detected. Electrochemical cell type sensors are common for most of the toxic gases, non-dispersive infrared (NDIR) for CO2 & Refrigerant Gases and Combustible Gas sensors are catalytic bead (pellistor) type.

Acme also offers other versions of the MutiSet where only a maximum of 4 channels (CEL4) or 32 channels (CEL) are supported. Output configurations are limited and the user keypad is optional.

  • 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.

  • Energy savings through the intermittent operation of ventilation equipment in enclosed facilities.
  • Suitable for garages, tunnels, warehouses and other enclosed commercial locations where a hazardous build-up of gases may occur.
  • Designed for multiple stage projects.

Principle of Operation

The ST Series Sensor/Transmitters provide a linear, 4-20 mA output signal over the desired detection range for the gas selected. This signal is digitally transmitted to the CEL(LS) Control Panel using an addressable RS-485 communication interface.

Typical Specifications:

Supply, install and connect at locations shown on plans ACME model XX-ST-485 Sensor/Transmitters and a CEL (LS) Control Panel.

Each Sensor/Transmitter shall be interrogated by the Control Panel and its data acquired and stored in memory.

The CEL (LS) Control Panel shall have multiple ON-OFF (LOW, HIGH & ALARM) outputs with visual status indicators. Discrete relay contacts shall be available to operate the mechanical ventilation equipment based on demand. Local and/or remote alarm devices shall also be activated by the ON-OFF relays.

The CEL (LS) Control Panel shall have a removable keyboard to program system control parameters. The CEL (LS) Control Panel’s logic circuits shall operate the exhaust/supply fans and dampers according to job specifications. The Control Panel shall supply 24VAC to all remote Sensor/Transmitters.

The standard panel provided shall be a gasketed NEMA 1 enclosure with provision for a 120VAC 50/60 Hz power input. Power shall be supplied from a dedicated uninterruptible 15A circuit. (Provision for battery back-up is optional).

  • Gases Detected: CO, Diesel Fumes (NO2), CO2, O2, H2, H2S, Ammonia, etc. Methane, Propane & Butane Family of refrigerant gases
  • Sensor Technology: Electrochemical, NDIR or Catalytic Bead
  • Sensing Method: Diffusion
  • Detection Range: Varies by gas
  • Accuracy: +/- 5ppm of reading
  • Power Requirements: 24V AC
  • Communication: RS-485
  • Operating Temperature: 32ºF to 104ºF (0ºC to +40ºC)*
  • Humidity Range: 0-95% RH Non-condensing
  • Expected Lifetime:
    • Electrochemical CO: 7 years
    • Electrochemical other: 2 Years
    • 2 Years for Catalytic Bead;
    • 10 Years for NDIR;
  • Enclosure: NEMA 3
  • Calibration Verification: Yearly
  • Approvals:
    • CAN/CSA-22.2 No 1010.1-92
    • UL 61010C-1
    • ISA S82.01

* Extended temperature range available

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