Environmental, industrial, and commercial Carbon Dioxide (CO2) gas detector. Available in both a space and duct mount version.



Decorative Enclosure for CO2


To sense and transmit to any compatible electronic analog control, DDC/PLC controller or automation system for the control of ventilation equipment. Designed to meet ventilation requirements specified in ASHRAE Standard 62-1999.


  • Setup/calibration fully menu driven
        (requires LCD option).
  • Monitors CO2 over range 0-2000 PPM
        (factory default).
  • Field adjustable range from 0-1500 PPM up to
        10,000 PPM without re-calibration
  • NDIR single beam with patented self
        calibration algorithm.
  • Guaranteed 5 year calibration interval.
  • Optional on board relay 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 two field adjustable analog output
        signals, linearized over full range.
  • Easy to calibrate in the field



 CO2 DETECTOR - Product # CDD

Gas Detected Carbon Dioxide (CO2)
Range 0 -2000 ppm standard, programmable from 1500 up to 10,000 ppm in 500 ppm increments
Standard Accuracy 75 PPM or 3% of reading (whichever is greater) 15-32 ºC (59-90 ºF) for 0-2000 ppm range
5% of reading for 2000-10,000 ppm
Extended Accuracy 150 ppm or 5% of reading (whichever is greater) 0-50 C (32-122 F) for 0-2000 ppm range
7% of reading for 2000-10,000 ppm
Sensing Element Non-Dispersive Infrared Detector (NDIR)
Operation Conditions 0-50 (32-122 F), 0-95% RH non-condensing
Repeatability 20 PPM
Stability 20 PPM typical, 5 year calibration interval
Manufacturing Process ISO 9002 certified
Output Signal 4-20 mA active (sourcing), 0-5Vdc and 0-10Vdc, jumper selectable (Note correct part number)
Output Drive Capability 550 ohm max for current output, 10 Kohm min for voltage output
Output Resolution 10 bit PWM
LCD Display (optional) LCD for displaying PPM level (required for field programming) 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 Corporate Space -91mm W x 127mm H x 43 mm D
Duct ABS -124 mm W x 183 mm H x 43 mm D
Pressure Dependance 0.13% of reading per mm Hg
Altitude Correction Programmable from 0-5000 ft in 500 ft increments
Response Time < 60 seconds for 90% step change
Warm-up Time < two (2) minutes
Power Supply 20-30 Vac/dc (non-isolated half-wave rectified)
Consumption 80 mA max @ 24 Vdc, 36 mA avg @24 Vdc
Input Voltage Effect Negligible over specified operating range
Protection Circuitry Reverse voltage protected and output limited
Input Voltage Effect Negligible over specified operating range
Optional Relay Output One Form C contact (N.O. and N.C.), status LED, 5 amps @ 250 Vac, 5 amps @ 30Vdc, p.f. = 1
Relay Trip Point -Programmable 500-1500 ppm in 50 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)