Environmental, industrial and commercial indoor Carbon Monoxide (CO) gas detector. Available in both a space and duct mount version.


ABS Duct Enclosure for CO


To sense and transmit to any compatible electronic analog control, DDC/PLC controller or automation system for the control of ventilation equipment.


  • Setup/calibration fully menu driven
        (requires LCD option)
  • 0-300ppm for electrochemical (7%),           0-500ppm for electrochemical (3%)
  • Solid state or electrochemical sensing elements
  • Optional on board relays with field adjustable
    trip point.
  • Optional LCD for displaying PPM level and menu  options.
  • Powered by either AC or DC source with no change  to circuit required.
  • Choice of three field adjustable analog output
     signals, linearized over full range.
  • Easy to calibrate in the field


 CO DETECTOR - Product # CMD

Gas Detected Carbon Monoxide (CO)
Range 0-300 ppm electrochemical and 0-500 ppm electrochemical
Standard Accuracy 7% of reading for 0 -300 ppm with electrochemical
3% of reading for 0 -500 ppm with electrochemical
5-45 (41-113 F), 15 -95% RH
Sensing Element Electrochemical
Operation Conditions 0-50 (32-122 F), 15 - 95% RH non-condensing
Sample Method Diffusion or flow through, sample tube for duct
Stability < 5% signal loss/year
Manufacturing Process ISO 9002 certified
Output Signal 4-20 mA active or passive, 0-5Vdc or 0 -10 Vdc jumper selectable
Output Drive Capability Active current output -750 ohms max
Passive current output -1000 ohms max @ 24 Vdc
10 Kohm min for voltage output
Output Resolution 10 bit PWM
LCD Display (optional) LCD for displaying PPM
1 ppm resolution, 28 x 13 mm alpha-numeric 2 line x 8 characters
Field Calibration Calibration, applying calibration gas standards (Contact Greystone for Calibration kit)
External Dimensions ABS Space -124.5 W x 183.5 H x 43 mm D
Duct ABS -124.5 x 183.5 x 250.5 mm includes duct insertion tube
Pressure Coefficient 0.020 0.008% signal/mBar
Typical Coverage Area 700 m2 (7500 ft2)
Response Time < 30 seconds for 90% step change
Warm-up Time 200 seconds
Power Supply 20-30 Vac/dc (non-isolated half-wave rectified)
Consumption 100 mA max @ 24 Vdc with all options on
200 mA max @ 24 Vac with all options on
Input Voltage Effect Negligible over specified operating range
Protection Circuitry Reverse voltage protected and output limited
Transient protection and resettable fuse
Optional Relay Output One or two Form C contact (N.O. and N.C.), status LED's,
5 amps @ 250 Vac, 5 amps @ 30Vdc, p.f. = 1
Relay Trip Point -Programmable 10, 15, 25, 50 or ppm increments
Relay Hysteresis -Programmable 25-200 ppm in 25 ppm increments
Programming and Selection Via internal push-buttons and jumper
Wiring Connections Screw terminal block (14 to 22 AWG)