Acme Engineering Prod. Ltd.

- Model QD-REF Series - Quadset Refrigerant Gas Monitor

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The Acme Quadset Refrigerant Gas Monitor is designed to detect refrigerant leaks in enclosed areas. The Monitor utilizes a sophisticated NDIR sensor specific to any one of the commercially available refrigerants. It can monitor over a range of 0-1000ppm with a resolution threshold as low as 1ppm. The Quadset can monitor up to four locations in one of two modes of operation, diffusion or sample-draw. In the diffusion mode, up to four RF-IR-ST-24 Refrigerant Sensor/ Transmitters can be daisy-chained to the Monitor and transmit data on a RS-485 communication bus.

The Acme Quadset Refrigerant Gas Monitor is designed to detect refrigerant leaks in enclosed areas. The Monitor utilizes a sophisticated NDIR sensor specific to any one of the commercially available refrigerants. It can monitor over a range of 0-1000ppm with a resolution threshold as low as 1ppm.

The Quadset can monitor up to four locations in one of two modes of operation, diffusion or sample-draw.

In the diffusion mode, up to four RF-IR-ST-24 Refrigerant Sensor/ Transmitters can be daisy-chained to the Monitor and transmit data on a RS-485 communication bus.

In the sample-draw mode, built-in diaphragm pumps continuously draw air samples from the four locations via tubing, the incoming samples are then diverted to a built-in sensor by means of a sequencer and solenoid valves.

The Quadset is easy to install and maintain. It has a 4-line backlit LCD for refrigerant gas readings and LED indicators for relay output status. The LCD is also used for programming the system parameters via a removable keypad.

Designed to act as a fixed in-situ safety monitor, the Quadset automatically operates the mechanical ventilation system of a facility upon detection of low levels of refrigerants, thereby protecting occupants, personnel and gas-sensitive goods and products.

The standard Monitor has a 3-stage relay output configuration and a malfunction relay. Options include 4-20mA analog output based on average or worst reading, a strobe light and/or a horn.

With the increased use of gas detection in maintenance and industrial facilities, the Quadset allows installers and users to meet code requirements in an economical fashion using commercial-grade gas detection equipment.

The Quadset contains all the well-known standard features of ACME’s gas detection line; a robust enclosure, the latest sensor technology and state of-the-art electronics. For more versatile gas options, please consult the ACME binder or website.

  • High-accuracy refrigerant-specific NDIR sensor
  • Up to 4 points of detection
  • Diffusion or sample draw
  • 4-line LCD included and Removable Keypad available
  • 3-Stage relay output with LED status indicators
  • Optional - 4-20mA output
  • Easy to install and maintain
  • Meets and exceeds ANSI/ASHRAE 15-1994

  • Suitable for control of emergency ventilation systems and for personnel protection
  • Refrigerant leak or spill detection from chillers, pipes, compressors and valves
  • Commercial or industrial facilities using chillers or refrigeration units, food plants, meat-packing plants and cryogenic plants
  • Direct connection to the existing building management system
  • (BMS) or DDCS

  • Gases detecte d: R-11, R-12, R-22, R-123, R-134A, R-407C, R-410A, R507A, NH3......
  • Sen sor Techn ology: NDIR Infrared
  • Sen sing Meth od: Diffusion or sample-draw
  • Detection Range : 0-1000ppm
  • Resoluti on: 1ppm
  • Accuracy: +/- 5ppm
  • Response Time (T90%): 60 seconds
  • Power Requirement s: 24V or 120V or 240V 50/60 Hz
  • Out put s: 3-stage relay; contact rating 3A @ 120VAC inductive 4-20mA
  • Operating Tem perature : 32ºF to 104ºF (0ºC to +40ºC)
  • Humidity Range : 0-95% RH Non-condensing
  • Expecte d Li fetime : 10 years
  • Enclosure : NEMA 1 - Metal with locked door for Surface Mounting
  • Dimen sions: 16” x 12”x 6” (400mm x 300mm x 150mm)
  • Recommended Calibrati on: Every 6 months

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