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Testo 320 Flue Gas Combustion Analyzer W/Case O2 CO CO2 0563 3220 70

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 Product Description

Combustion analysis in high definition is more than just a brilliant display, it’s a combination of proven measurement standards, contractor-rugged design, and Testo’s innovation.

The testo 320 makes combustion analysis easier to perform, easier to control, and easier to understand. The 320 is designed for the job site and for the contractor that expects more. Use it for basic testing and tuning of all types of boilers, heater or furnaces. Use it to set up and commission more complex multi-stage, or modulating heating systems. Combustion analysis, draft, temperature, pressure, combustion efficiency and a host of other calculations and functions - all shown in vivid color. With simple icon navigation, you soon realize it will do more for HVAC testing. 

With the testo 320 you gain more testing flexibility giving you more customer opportunities and greater profit potential. It provides all the parameters listed, plus the capabilities shown below. 

Comprehensive combustion analysis 

  • O2, CO, CO2, Ambient/room CO, CO Air free
  • CO sensors with NOx filter
  • Flue Draft, Pressure (vent or duct or switches)
  • Temperature (flue & room)
  • Combustion Efficiency, Excess air
  • Flue Gas Matrix (w/ four user-defined combustion types)
  • Oil flow and gas clock BTU calculator
  • Memory to 500 readings plus customer site information
  • Optional probes for
    • Fine pressure, Gas Leak, Ambient CO2 (IR), Ambient CO air, draft, pressure, differential temperature 
Designed for the job site and the needs of a busy contractor. 
The testo 320 gives you a wider measurement range that lets you test not only controlled or normal combustion applications but those that have problems. With a CO measurement range up to 4000 ppm (or optional 8000 ppm) you can test more combustion appliances. 

CO sensor with integrated NOx filter 
The testo 320 eliminates the guess work and provides accurate readings. Integrated NOx filters assure you of the highest CO measurement accuracy, unlike other analyzers that add the NOx concentration to the CO measurement displayed. Whether you are measuring combustion, air free, or ambient CO – you need to make the decision on a correct measurement.


  • High-definition graphic display - Not only is it bright and easy to see, it’s easy to understand
  • Sensor diagnostics & monitoring - Simple “traffic light” signal shows sensor health and readiness
  • Get your job done - Fast 30 second start up
  • Ultra-rugged housing - Hard rubberized housing to withstand real-life abuse
  • Save on battery replacement costs - Work all day with lithium rechargeable battery technology
  • Hands-free operation - Powerful magnets reside on the 320’s housing
  • Easy to see and replace filters - Protect the instrument’s measurement accuracy with quick exchange probe filters
  • Memory makes it smart - Store up to 500 tests printing on site or download to easyheat software
  • Hardened cam-lock fittings - Provides leak-free operation and greater test confidence
  • Additional probes - A wide range of probes enable you to upgrade at a moment’s notice and gives you greater customer flexibility
  • Longer lasting sensors - Typically last more than three years. Sensors are field replaceable and pre-calibrated
  • Simple icon navigation - Simple push button operation with easy-to-follow menu icons
  • Quick drain condensate trap - The sensor’s integrity is protected by the 320’s condensate trap 
Testo 320 Specifications
O2 measurement
0 to 21 vol.%
±0.2 vol.%
CO measurement
0 to 4000 ppm
±20 ppm (0 to 400 ppm)
±5% of m.v. (401 to 2000 ppm)
±10% of m.v. (2001 to 4000 ppm)

-40° to 2192 °F
±2 °F (32° to 212 °F)
±0.5% of m.v. remaining range

Draft measurement
-4 to 16 "H2O
±0.008 "H2O or
±5% of m.v. (at -0.2 to +0.2 "H2O)
±0.01"H2O (at 0.2 to 1.2 "H2O)
±1.5% of m.v. (at 1.2 to 16 "H2O


0 to 120 "H2O
±0.2 "H2O (0.0 to 20 "H2O)
±1% of m.v. (at 20 to 40 "H2O)
±1.5% of m.v. (at 40 to 120 "H2O)

Efficiency testing
0 - 100%
Excess Air
0 - 99%
CO2 calculation
(digital calculation from O2)

0 to CO2 max
bient CO measurement (with CO probe)
0 - 500 ppm
±5 ppm (0 to 100 ppm)
±5% of m.v. (>100 ppm)
Gas leak measurement for combustible
gases (with gas leak detector probe)

0 to 10,000 ppm
CH4 / C3H8

Signal Optical display (LED)
Ambient CO2 measurement
(with ambient CO2 probe)

0 to 1 vol. %
0 to 10,000 ppm

±50 ppm or ±2% of m.v.
(0 to 5000 ppm)
±100 ppm or
±3% of m.v.
(5001 to 10000 ppm)

Storage temp.-4° to 122 °F
Operating temp.23° to 113 °F
Power supplyRechargeable battery: 3.7 V/2400 mAh
Power supply: 6 V/1.2 A
Memory500 readings
DisplayColor graphic display 240 x 320 pixels
WeightApprox. 1.3 lbs.
Dimensions9.5 x 3.3 x 2.5 in.
WarrantyInstrument/probes/gas sensors: 24 mos.
Rechargeable battery: 12 mos.
  • Testo 320 combustion analyzer
  • Rechargeable battery 
  • 10 Extra particulate filters 
  • 12" probe with cone & hose assembly
  • AC power supply (with USB recharging)
  • Rugged case 
  • Calibration Certificate

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