HOME > UEI > CO-DETECTORS > CO91 uei logo

UEi CO91
Carbon Monoxide Analyzer
See: CO95

  • Measures ambient CO levels or CO concentration in flue gas
  • Simple to operate DMM style selector
  • CO MAX captures highest value
  • Temperature measurement for ambient or stack gas
  • Auto-zero at power up
  • Link to optional infrared printer with date and time
Click here for a larger image - UEI CO91 Carbon Monoxide AnalyzerClick here for a larger image - UEI CO91 Carbon Monoxide Analyzer
UEI CO91 Shown

Product Information
Datasheet 325 KB PDF
Manual 257 KB PDF
Click here for Information Regarding PDF'sPDF Help
The CO91 is used to check ambient CO levels, find leaks along flue pipes, or measure CO concentration in flue gas from furnaces or residential combustion appliances. With a link to the optional infrared printer, results can be printed to document test results, including the date and time. Perform adjustments to the appliance, and then recall the highest level of CO with the CO Max function. With the temperature function you are able to test register outlet temperatures, or monitor stack gas temperature. Three year limited warranty.
Specification UEi CO91
Parameter Resolution Accuracy Range
Temp Measurement
Temperature 1°F/°C ±5°F (2°C)
±0.3% reading
32-1112°F, (0-600°C)
Gas Measurement
Carbon Monoxide 1 ppm ±10 ppm<100 ppm
±5% of rdg>100 ppm
0-1999 ppm
Weight 2.2lbs.
Handset 7.9” x 1.8” x 3.5” (200mm x 45mm x 90mm)
Probe L 11.8” x Dia .25”/7.8” long stainless steel shaft. (300mm x 6mm/200mm)
Ambient Operating Range 32-104°F (0°C to 40°C)10% to 90% RH non-condensing
Battery x4 “AA” >8 hours continuous using AA Alkaline cells
Ordering Information
Model  Description Buy Online Price
CO91 UEi CO91 Carbon Monoxide Detector Discontinued
See: CO95
Included Accessories
  • 1 - ATT100 temperature probe
  • 1 - Carrying Case
  • 4 - AA Batteries
  • 1 - Manual
  • 1 - Three Year Limited Warrenty
Optional Accessories
IRP2 UEI IRP2 Printer Infrared  Buy Now Sale $227.95
(Reg. $275.00)
16646 UEi 16646 Replacement Thermal Paper Rolls  Buy Now Sale $8.30
(Reg. $9.22)
ATT100 UEI ATT100 Temp Probe, K-Type Liquid 6"  Buy Now Sale $17.90
(Reg. $22.95)
AACA4 UEI AACA4 Adapter, AC 9V 700mA  Buy Now Sale $21.29
(Reg. $26.95)
17631 UEi 17631 Replacement Particle Filter for Eagle Combustion Analyzers  Buy Now Sale $8.30
(Reg. $9.22)
17631PACK UEI 17631PACK Particle Filter, 10 PACK Discontinued
See: 17631