UEi C125
Eagle 2 Combustion System Analyzer
See: C155

  • Measures: Flue temperature, oxygen, carbon monoxide (CO), Differential, ambient carbon monoxide (CO), and differential pressure
  • Calculates: Carbon dioxide, gross/net efficiency, excess air, CO air free
  • Worklight
  • Unique DMM style rotary selector
  • Protective boot w/integral magnet
  • Real time clock
  • CO readings to 1 ppm
  • Large 4 line back-lit display
  • Infrared printer port
  • User programmable header
  • 179 memory position
  • User customizable parameters view
  • Individual report printouts
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UEI C125 Shown

Product Information
Datasheet 785 KB PDF
Manual 3.9 MB PDF
Click here for Information Regarding PDF'sPDF Help
The Eagle Combustion Analyzers™ makes combustion analysis as easy as turn the power on, select the fuel and go! The Eagle product line simplifies the complex efficiency process from basic combustion analysis to full system maintenance. Whether you're new to digital combustion analyzing or tired of scrolling through layers of navigation menus, the Eagle offers a quick start-up and a straightforward interface with a professional combination of features.

Eagle 2: C125 - Is 4 instruments in 1. Designed to offer advanced system analysis and productivity this kit includes the ground-breaking Eagle 2 Combustion Analyzer. This multi-functional instrument is a superior combustion analyzer with unmatched simplicity and a unique combination of features to enhance a technician's efficiency and safety. The Eagle 2 is perfect for combustion efficiency analysis but also doubles as a differential thermometer, differential manometer, and an ambient CO detector.
Specification C125
Function Range Resolution (High) Accuracy
Pressure (Differential) ±0.08”wg (±0.2mBar) 0.001” wg to 9.999” ±0.002”wg (±0.005mBar)
±0.4”wg (±1mBar) ±0.01”wg (±0.03mBar)
±32”wg (±80mBar) ±3% reading
Temp Measurement
Flue Temp Range 20 ~ 2400°F / -29 ~ 1315°C
Inlet Temp Range
Inlet Temp Range (Ambient) 32 ~ 112°F / 0 ~ 50°C
Net Temp (ÆT)** 20 ~ 2400°F / -29 ~ 1315°C
Resolution 0.1°F/°C
Flue (T1, Inlet T2, and Net ÆT) Accuracy ±[0.3% rdg +3.6°F(2°C)]
Inlet Temp Ambient Accuracy ±[0.3% rdg +1.8°F(1°C)]
Gas Measurement
Oxygen 0 ~ 21%
O2 Resolution/Accuracy 0.1% / ±0.2%*
Carbon Monoxide 0 ~ 4000 ppm
CO Resolution/Accuracy 1 ppm/±10 ppm <100 ppm* ±5% reading
Carbon Dioxide** 0 ~ 30%
CO2 Resolution/Accuracy 1.0%/±0.3% reading
Efficiency** 0 ~ 99.9%
Efficiency Resolution/Accuracy 0.1%/±1.0% reading
Excess Air** 0 ~ 250%
Excess Air Resolution/Accuracy 0.1%/±0.2% reading
Pre-Programmed Fuels
Natural Gas, Propane, Butane, LPG, Light Oil
Weight 2.2lbs. with boot
Handset 7.9 x 1.8 x 3.5”
Probe 11.8 x 0.25 x 9.4” stainless steel shaft, type K thermocouple (9’ hose)
Operating temp 0 to 40°C/10% to 90% Relative Humidity non-condensing
Battery x4 “AA” cells / 12 hour life typical with Alkaline “AA” cells
Warranty 3 year limited warranty (2 year sensor warranty)
*Measures **Calculates
Ordering Information
Model  Description Buy Online Price
C125 UEI C125UEI Eagle 2 Combustion System Analyzer  Discontinued
See: C155
C125KIT UEI C125KIT Eagle Combustion Analyzer Kit  Discontinued
See: C155KIT
C125OILKIT UEI C125OILKIT Eagle Combustion Analyzer Oil Service Kit  Discontinued
Included Accessories
  • 1 - Flue Probe KMCP2
  • 1 - Inlet Tube SM11103
  • 1 - Particle Filter 17631
  • 1 - Carrying Case
  • 4 - AA Batteries
  • 1 - Manual
  • 1 - 3 Year Limited Warranty (2 year on sensor)
Optional Accessories
AACA4 UEI AACA4 Adapter, AC 9V 700mA  Buy Now Sale $21.29
(Reg. $26.95)
ATT100 UEI ATT100 Temp Probe, K-Type Liquid 6"  Buy Now Sale $17.90
(Reg. $22.95)
CALKIT UEi CALKIT Field Sensor Calibration Kit for the Eagle Combustion Analyzers  Buy Now Sale $279.68
(Reg. $377.95)
D460 UEi D460 Draft Velocity Gauge with Probes and Carrying Case, .005-1.0" w.c.,260-4000 FPM  Buy Now Sale $66.45
(Reg. $69.95)
EABT UEi EABT Eagle and Eagle X BlueTooth Upgrade Module  Discontinued
EAKIT UEi EAKIT Eagle II/III Accessory Kit  Buy Now Sale $35.51
(Reg. $44.95)
EARS232 UEi EARS232 RS232 Connection Cable for Eagle Testers  Discontinued
KMIRP2 UEI KMIRP2 Printer Infrared  Buy Now
SPT1 UEi SPT1 Smoke Pump Tester Kit  Buy Now Sale $92.38
(Reg. $127.95)
Replacement Parts/Supplies
KMCP2 UEI KMCP2 Flue Probe,for Eagle Series  Buy Now Sale $146.69
(Reg. $190.50)
13124 UEi 13124 Compression Ferrule for Eagle Series, CO91, SmartBell  Buy Now Sale $8.96
(Reg. $9.95)
16646 UEi 16646 Replacement Thermal Paper Rolls  Buy Now Sale $8.30
(Reg. $9.22)
SP9 UEi SP9 Smoke Level Reference Chart  Buy Now Sale $21.02
(Reg. $26.95)
17631 UEi 17631 Replacement Particle Filter for Eagle Combustion Analyzers  Buy Now Sale $8.30
(Reg. $9.22)
17631PACK UEi 17631PACK Replacement Particle Filter 10-Pack  Buy Now Sale $61.56
(Reg. $79.95)
SM11103 UEi SM11103 Inlet Tube Probe Connector  Buy Now Sale $4.04
(Reg. $5.61)
SM1182/7 UEi SM1182/7 Water Trap for Combustion Analyzers  Buy Now Sale $21.59
(Reg. $28.79)
CM11667/2 UEi CM11667/2 Water Trap Drain Plug  Buy Now Sale $5.36
(Reg. $5.95)
CM11667/2 PACK UEi CM11667/2 PACK Water Trap Drain Plug 10-Pack  Buy Now Sale $25.24
(Reg. $31.95)
ATT29 UEI ATT29 Temp Probe, K-Type Standard  Buy Now Sale $17.90
(Reg. $22.95)
17662 UEi 17662 O2 Sensor Module for Eagle Combustion Analyzers  Discontinued