RI-215 Series
Infrared CO2 Gas Monitor

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The RI-215 series of IR CO2 montitors are widely used in the measurement and control of CO2 levels in a variety of applications where CO2 monitoring or detection is required. A highly accurate, RKI non-dispersive infrared absorption sensor is used to provide direct measurements through diffusion or sample draw monitors, and activate alarms or control ventilation systems based on preset CO2 levels. Each model provides a digital readout in parts per million of CO2 providing precise measurement and direct visual indication of gas levels. A 4-20 mA output is provided to send a signal to a fire panel or other PLC system and a relay is available to trip an alarm or activate a ventilation system.

Three levels of measurement are provided: 0-2,000 ppm (ASHRAE 1969 IAQ max PEL), 0-5,000 ppm (leak detection of CO2 storage tanks) and 0-9,999 ppm. The RI-215A runs on 24 VAC or 24 VDC and the RI-215D with sample drawing pump runs on 115 VAC or 220 VAC. Each are designed for indoor use only and supplied in a NEMA 12 enclosure that is easily accessible for calibration, service, and continuous monitoring. RKI offers additional monitors with higher measurement levels in portable or fixed installation applications. Please contact an RKI authorized representative for more information on other CO2 monitors available

  • Easy to read LCD digital display
  • Compact, lightweight and easy installation
  • Highly reliable non-dispersive infrared detection method
  • Recorder output signal
  • Automatic control of ventilation systems
  • Alarm contact output provided
  • 4-20ma output provided
  • Diffusion or sample draw versions available
  • Meets ASHRAE 1969 IAQ Standard of 2,000 ppm max PEL
  • Detection of CO2 for NFPA 12 Regulations-CO2 storage tank leaks
  • Green houses, wineries, breweries, food processing, indoor air quality, and other industry applications
Detection Method
Non dispersive infrared absorption method (NDIR)
Sample Method
Sample drawing pump
Measuring Gas
Carbon dioxide (CO2) in air
Measuring Range
0-2,000ppm, 0-5,000ppm, or 0-9,990ppm * Specify one of these ranges when ordering
1 ppm for 0-2,000 ppm
10 ppm for 2,000-9,990 ppm
± 3% of full scale (at constant temperature and humidity conditions)
Output Signal
0-10VDC linear (load resistance: Min. 300K ), or 4-20mADC linear (load resistance: Max. 500 )
*Specify one of these outputs when ordering
Flow Rate
Above 1.0 liter/min
Alarm Range
50 ppm – Full scale (adjustable in steps of 10 ppm) 
*Standard alarm point 1,000 ppm
125VAC, 0.5A (load resistance), Dry contact (normally open)
Operation Temp. & Humidity
0 ~ 40ºC (32-104ºF), 10-90%RH (non-condensing)
Warming Up Time
30 minutes for full warm up (display starts after 1 minute)
Power Requirement
24 VDC ± 10% or 24 VAC ± 10%
115 VAC or 220 VAC, ± 10%, 50/60 Hz
Installation Method
Wall mount vertically, indoor locations only
Outer Dimensions
Approx 78(W) x 78(H) x 31(D) mm
Approx 3.1(W) x 3.1(H) x 1.2(D) in.
XApprox 220(W) x 200(H) x 76(D) mm
Approx 8.7(W) x 7.9(H) x 3.0(D) in.
Approx. 200g (6.50 oz.)Approx. 3.6kg (7.9 lbs.)
Symptoms of Exposure to CO2
CO2 %Symptom
0.1Typical office environment CO2 hygiene control level (1,000 ppm)
0.2ASHRAE maximum permissible limit (2,000 ppm)
0.5TLV (Threshold Limit Value) Level (5,000 ppm)
3~5Increased rate of breathing. Pulse and blood pressure increase. Eventually headache and dizziness occur.
6~7Breathing becomes difficult
7~10Unconscious within a few minutes
20Unconscious within a few seconds and death

* Specifications subject to change without notice.