Directly from the manufacturer

Image
  1. Home
  2. testo 320
0633 3200 01

testo 320 - Standard flue gas analyzer with O₂ and CO sensors

Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Standard flue gas analyzer for everyday commissioning, service and maintenance of heating systems with O₂ and CO sensors.
  • Clear view at a glance – Large 5.5" touchscreen with real-time data
  • Streamlined workflows – App-like interface with step-by-step guidance for fast navigation and consistent results
  • testo Smart App integration – Remote control, second screen and fast reporting on site
  • Centralized data management – Connecting measurements, jobs and devices in one system via testo Smart Connect
  • Parallel measurements – Capture multiple values at once for faster daily work
  • All-day operation – Long battery life and fast charging for uninterrupted use throughout the working day
The testo 320 provides HVAC/R professionals with a complete, ready-to-use solution for standard flue gas analysis. At its core is the testo 320 standard flue gas analyzer with integrated O₂ and CO sensors (up to 5,000 ppm CO), designed for daily commissioning, service and maintenance work on gas and oil-fired systems. The large 5.5" IPS touchscreen with app-like interface presents all key values at a glance and guides users step by step through typical measurement tasks, ensuring fast navigation and consistent results.

Via the integrated Bluetooth interface, the testo 320 connects to the testo Smart App and up to four wireless probes, enabling remote control, second screen operation and the integration of temperature, differential pressure, CO and CO₂ measurements. Central data management via testo Smart Connect and long battery life with fast USB-C charging support efficient workflows and uninterrupted operation throughout the working day.

O₂

Measuring range
0 to 21 Vol.%
Accuracy
±0.2 Vol.% ±1 Digit
Resolution
0.1 Vol.%

Flue Gas Draft

Measuring range
-4.00 to +16 InH₂O / -9.99 to +40 hPa
Accuracy
±1.5 % of mv (+1.20 to +16 InH₂O) ±1 Digit / ±1.5 % of mv (+3.01 to +40 hPa) ±1 Digit
±0.01 InH₂O (0.0 to +1.20 InH₂O) ±1 Digit / ±0.02 hPa (0.1 to +3.00 hPa) ±1 Digit
±0.002 InH₂O (0 to 0.0 InH₂O) ±1 Digit / ±0.005 hPa (0 to 0.1 hPa) ±1 Digit
Resolution
0.000 InH₂O (+0 to 0.0 InH₂O) / 0.001 hPa (+0 to 0.1 hPa)
0.00 InH₂O Remaining Range

Temperature

Measuring range
-40° to 2192 °F / -40 to +1200 °C
Accuracy
±0.5 % of mv (Remaining Range) ±1 Digit
±0.9 °F (32° to 212.0 °F) / ±0.5 °C (0.0 to +100.0 °C) ±1 Digit
Resolution
1.0 °F (Remaining Range n2{+#0} {%S2}) / 1 °C Remaining Range
0.1 °F (-40° to 1831.8 °F) / 0.1 °C (-40 to +999.9 °C)
  • Standard flue gas analyzer testo 320 (device model 0633 3200 01) with O₂ and CO sensor

Flue gas probes

0600-9760-flue-gas-probe-modular-1

: 0600 9760

7" flue gas probe, 5/16" diameter, Tmax = 932 °F, with hose
7" flue gas probe, 5/16" diameter, with 7' hose, Tmax=932 °C
$ 427.00
flue gas probe

: 0600 9761

12" flue gas probe, 5/16" diameter, Tmax = 932 °F, with hose - 12" flue gas probe, 5/16" diameter, Tmax = 932 °F, with hose
Easy probe shaft replacement via quick-change click system
$ 372.30
Image

: 0600 9762

7" flue gas probe, 1/4" diameter, Tmax = 932 °F, with hose
Easy probe shaft replacement via quick-change click system
$ 428.00
0600-9763-flue-gas-probe-1

: 0600 9763

12" flue gas probe, 1/4" diameter, Tmax = 932 °F, with hose - 300 mm, Ø 6 mm, Tmax 500°
Easy probe shaft replacement via quick-change click system
$ 438.00
Flexible probe shaft

: 0600 9770

Flexible flue gas probe
For flue gas measurements on heating system burners
$ 560.00
Image

: 0600 9740

7" flue gas probe, 3/8" diameter, Tmax = 932 °F, with hose
12" probe, 3/8" diameter with 5' hose
$ 279.00

Pressure Probe

testo 510i

: 0560 1510 01

testo 510i - Differential pressure manometer wireless Smart Probe
Measurement of gas flow and static pressure
$ 219.00

Probes

clearance-probe-for-O2-supply-air-measurement

: 0632 1260

Annular gap probe
Annular gap probe
$ 243.00
CO probe (digital), wired

: 0632 1272

CO probe (digital) - wired
Intuitive: clearly structured measurement menu for long-term measurement and determination of CO concentration in indoor areas, e.g. in boiler rooms
$ 582.00
CO probe (digital) with Bluetooth®

: 0632 1271

CO probe (digital) - with Bluetooth®
Intuitive: clearly structured measurement menu for long-term measurement and determination of CO concentration in indoor areas, e.g. in boiler rooms
$ 638.00
CO2 probe (digital) with Bluetooth® including temperature and humidity sensor

: 0632 1551

CO₂ probe (digital) - with Bluetooth® including temperature and humidity sensor
Intuitive: clearly structured measurement menu for long-term measurement and parallel determination of CO₂ concentration, humidity and air temperature in indoor areas
$ 917.00
0600-9765-flue-gas-probe

: 0600 9765

Solid fuel set (probe shaft, adapter)
Solid fuel set (probe shaft, adapter, upgrade CD)
Hose connection set for separate gas pressure measurement

: 0554 1203

Adapter for pressure readings - Pressure connection set for testo 320 / 330
Adapter for pressure readings

Temperature probes

testo 115i

: 0560 2115 03

testo 115i - Pipe-clamp thermometer operated via smartphone
Convenient temperature measurement on refrigeration, air conditioning and heating systems – thanks to wireless connection to your smartphone or tablet
$ 129.00
testo 915i

: 0563 4915 01

testo 915i - testo 915i - Wireless thermometer with flexible temperature probe (TC type K) and smartphone operation
Smart Probe for wireless temperature measurement in a wide range of applications, thanks to a large selection of probes and compatibility with standard type K thermocouple probes
$ 162.00
Image

: 0600 9799

Combustion air temperature probe
Flexible positioning (immersion depth 190 mm, cable length 2.2 m) 
$ 124.00
Clamp probe with NTC temperature sensor for measurements on pipes (Ø 6-35 mm)

: 0615 5505

Clamp probe with NTC temperature sensor - for measurements on pipes (Ø 6-35 mm)
Measuring range from -40 to +125 °C
$ 97.00
Pipe wrap probe with NTC temperature sensor for measurements on pipes (Ø 5-65 mm)

: 0615 5605

Pipe wrap probe with NTC temperature sensor - For measurements on pipes (Ø 5-65 mm)
Measuring range from -50 to +120 °C
$ 258.40
Waterproof immersion/penetration probe with NTC temperature sensor

: 0615 1212

Waterproof immersion/penetration probe - with NTC temperature sensor
Measuring range from -50 to +150 °C; accuracy of up to ±0.2 °C
$ 109.65

  • not available
Find out more

Accessories

testo mobile BLUETOOTH®/IRDA printer

: 0554 0622

Mobile BLUETOOTH®/IRDA printer
Bluetooth® & IRDA interface in one printer
$ 435.00
Spare thermal paper

: 0554 0568

Spare thermal paper
Spare thermal paper, permanent ink
$ 40.80
Smoke tester with oil, soot sheet, for measuring soot in flu...

: 0554 0307

testo 307 - Standard smoke pump kit
Standard smoke / soot pump kit (includes scale, filter paper, and lubricant)
$ 204.00
No picture available

: 0554 0308

Filter paper for smoke spot measurement
Filter paper for smoke spot measurement
$ 18.00

Transport Case

testo 320-330 case

: 0516 3300

System case (height: 130 mm) for instrument, probes and acce... - System case (height: 130 mm) (Discontinued)
System case (height: 130 mm) for instrument, probes and accessories
$ 157.00
testo 320-330 case

: 0516 3301

System case with double base (height: 180 mm) for instrumen... - System case (height: 180 mm
System case with double base (height: 180 mm) for instrument, probes and accessories
$ 188.70
Instrument bag

: 0516 3001

Instrument bag with carrying strap
Robust instrument bag for flue gas analyzer, probe and accessories
$ 92.65
Headquarters
Testo Inc.
40 White Lake Road
07871Sparta
New Jersey
800-227-0729

© 2026