by Fmeaddons

Portable Infrared CO2 Gas Monitor – Discontinued

GX-6000 is recommended (click here)

  • Microprocessor controlled
  • Instantaneious, Peak, and Average values provided
  • Compact and Lightweight
  • Audible and visual alarms
  • Internal sample drawing pump
  • LCD digital display with backlighting
  • Recorder output signal (0-1V linear)

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This Model RI-85 is a compact, lightweight portable CO2 monitor with an Infrared (NDIR) type sensor. This sensor provides fast and accurate detection of CO2 levels from 0 to 10,000 ppm. An internal pump is utilized for continual sampling, and the unit operated for 12 hours from one set of batteries. Microprocessor control provides average readings over a selected time period, and also can display the peak value detected.


  • Indoor air quality CO2 level testing
  • Safe CO2 breathing levels in plants or factories
  • Leak checking on CO2 fire extinguisher equipment
  • Check before intering after CO2 extinguisher use.
  • Exhaust gas leak from combustion appliances in homes or plants


Detection Principle
Non-Dispersive Infrared Detection (NDIR)
Measuring Gas Carbon dioxide (CO2) in air
0-10,000 ppm
Resolution 10 ppm/digit from 0-2,000 ppm,
25 ppm/digit
from 2,000-5,000 ppm,
50 ppm/digit
from 5,000-10,000 ppm
Sample drawing with internal pump
Repeatability + / – 3% F.S. (with constant conditions)
Alarm Display Audible and visual alarms (non-latching)
Alarm Point Any one level selection of 1,000 ppm, 5,000 ppm, or OFF
Response Time Within 15 seconds to 90% response
Operating Temp.
& Humidity
-10 ~ 40°C (14 ~ 104°F), below 90%RH
Power Source AA size Alkaline batteries (4 pcs.)
Approx. 12 hours (With no alarm or backlight, with alkaline batteries at room temperature)
Dimension Approx. 85mm(W) x 190mm(H) x 40(D)mm,
3.5″(W) x 7.8″(H) x 1.6″(D)

500g, 1.1 lb.
Display Current reading, Average value, or Peak reading
Pushbutton select
Average Value Time Selected from 1 minute, 3 minutes, or 15 minutes
External Output Signal 0-1v DC linear output
  • Carrying case
  • Spiral tube (1m)
  • Gas sampling probe
  • Absorption tube for zero adjust
  • AA size alkaline batteries
  • Operating manual
  • Gas cylinders for zero and span calibration
  • Sample bag
  • Absorptive agent for zeroing
  • Jack for external output

Specifications subject to change without notice.


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