Acme Engineering Prod. Ltd.

- Model TW-ECH - Stand-Alone Dual Gas Monitor



The Acme TwinSet and its microprocessor-based system features a high quality stand-alone controller providing all the necessary hardware for the continuous monitoring of two gases in the following combinations: CO/CO, CO/CO2, CO/ NO2, CO/COMB. This unit is primarily geared towards providing alarm activated relays for simple applications such as small parking garages.


The TwinSet employs the best sensing technologies available: electrochem and pellistor (catalytic combustion) cells . These quality components provide virtually instantaneous detection of targeted gasses and deliver long-term trouble-free operation. The main body of the TwinSet detects carbon monoxide build up, while the remote sensor monitors either CO, NO2 or a combustible.

Installed within the monitored space, the TwinSet monitors targeted gas concentration rates and automatically operates the mechanical ventilation system of a facility. Upon detection of low levels of hazardous and flammable gases the ventilation system is energized thereby protecting occupants, personnel and gas-sensitive goods and products.

The TwinSet contains all the well-known standard features of ACME’s gas detection line; a robust enclosure, the latest sensing technologies and state-of-the-art electronics.

  • High-accuracy Electrochemical Cell sensor for toxic gases and Catalytic (Pellistor) for flammables
  • 3 or 4-stage SPDT relay outputs with LED status indicators
  • NEMA 3 Robust Enclosure
  • Microprocessor-based control
  • 10-Step Bar-Graph Display of gas levels
  • Programmable time delays to avoid nuisance alarms
  • Optional 4-20mA, 0-1V DC, 0-5
  • V DC or 0-10V DC analog output
  • Optional remote sensor

  • Versatile and cost-effective way of detecting two gases simultaneously by a single Controller
  • Energy savings through the intermittent operation of ventilation equipment in enclosed areas
  • Commercial or industrial locations where a sudden build-up of toxic and/or flammable gases may occur
  • Car Parking and Bus Maintenance Garages, Tunnels, Warehouses, Factories, Food Processing and Bottling Plants, Wastewater Treatment Plants, Steel Mills, Cryogenic laboratories and Incineration Rooms
  • Stand-alone with relay outputs or analog outputs for direct connection to the existing Building Management System (BMS) or DDCS

  • Gases Detected: CO, CO2 , NO2 , H2 , CH4 (Methane), C3 H8 (Propane)

Sensor Technology:

  • Toxic: 3-Electrode Electrochemical Cell
  • Flammable: Catalytic Pellistor
  • Sensing Method: Diffusion
  • Power Requirements: 24V or 120V or 240V 50/60Hz
  • Optional:
    • 4-20 mA, or one of the following
    •  0-1V DC
    •  0-5V DC
    •  0-10V DC
  • Operating Temperature: -4ºF to 120ºF (-20ºC to +50ºC)*
  • Humidity Range: 15-90% RH
  • Accuracy: +3% /- 5% of Calibrated value (electrochemical sensors) +/- 1 L.E.L (pellistor)
  • Repeatability: 2% of Signal
  • Response Time (T90%): 40 seconds
  • Expected Sensor Lifetime:
    • Electrochemical
    • 2 years for other gases
    • Pellistor
    • 3 years
  • Main Enclosure:
    • NEMA 3
    • Polystyrene
    • Grey
    • Surface Mounting
  • Main Enclosure Dim.: 6” x 6”x 4” (152mm x 152mm x 102mm)
  • Approvals: CAN/CSA C22.2 No. 61010-1:2004 ANSI/UL 61010-1:2004

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