Greystone CMD5B4000 MOD Carbon Monoxide Detector

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Greystone CMD5B4000 MOD Carbon Monoxide Detector is a device used to monitor the carbon monoxide levels and output of a field selectable 4-20mA or voltage signal using the electrochemical sensor. The voltage signal may be set to 0-50 or 0-10 Vdc. Through the on-board menu, the sensing range and output can be increased to 100, 150, 300, 400, or 500 ppm.

Applications: Pharmaceutical Clean Rooms, HVAC, Laminar Air Flow Cabinets, and Biosafety Cabinets.

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Greystone CMD5B4000 MOD Carbon Monoxide Detector is a front panel test switch, a status indicator, and an alarm buzzer are additional features that come as standard. The LCD also has a backlight. With a digital input signal, the test function may also be remotely managed. Local configuration of all device parameters is possible through the on-board menu.
Features of Greystone MOD Carbon Monoxide Detector:

  • Optional relay outputs & audible alarm
  • Modbus communication
  • Long-life electrochemical sensor
  • Space or duct mount models
  • Various analog outputs
  • LCD display


Additional information



Model No



0-100, 150, 300, 400, or 500 PPM (Selectable)


±5 PPM or 5% of reading

Sensor Type

Electrochemical Sensor

Operating Temperature

-20 to 50ºC

Operating Humidity

15 to 95% RH

Sample Method

Diffusion or flow through sample tube for duct mounted models

Response Time

<35 seconds for 90% step change

Power Supply

24 Vdc ± 20% or 24 Vac ± 10% (non-isolated half-wave rectied)

Power Consumption

100 mA max. with all options on

Buzzer Alarm

85 db @ 10 cm

Buzzer Trip Point

Programmable 20-500 ppm in 10 ppm increments

Buzzer Delay

Programmable 0-10 minutes in 1 minute increments

Enclosure rating

• Space (4) – ABS – UL94-V – IP65 (NEMA 4X) • Duct (5) – ABS – UL94-V – IP65 (NEMA 4X)


• Space: 145 X 101 X 64 mm • Duct: 145 X 101 X 240 mm

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Greystone CMD5B4000 Carbon Monoxide Monitor

Greystone CMD5B4000 MOD Carbon Monoxide Detector