Testo connects its combustion analyzers and thermal imaging camera
Summary for decision-makers
Testo has updated its testo 330 and testo 320 combustion analyzers and launched the testo 862 connected thermal imaging camera. The analyzers are available in five models, from carbon monoxide sensors with a 5,000 ppm range up to 40,000 ppm with dilution protection. They feature a 5,5-inch touchscreen and connect via Bluetooth to other Testo instruments. The camera is available in 160 × 120 and 256 × 192 pixel resolutions. All models feed into the testo Smart app, which generates reports on-site.
Recording readings now takes as much time as performing them. Maintenance certificates, intervention traceability, maintenance reports: the paperwork adds to already tight schedules. Testo is updating its two families of combustion analyzers and launching a handheld thermal imaging camera, all connected to the same application.
A touchscreen and on-screen guidance replace menus.
A combustion control system involves a series of short, sequential operations: resetting the appliance, measuring flue gases, checking the draft, and monitoring the ambient carbon monoxide level. The testo 330 and testo 320 display these steps on a 5,5-inch touchscreen and guide the operator from one to the next. The manufacturer highlights faster commissioning and simplified procedures.
On the testo 330, zeroing is performed automatically upon commissioning, ensuring stable results even under adverse measurement conditions. The sensors are developed in-house, a choice that impacts both the reproducibility of readings from one service to the next and the cost of replacement. This product range relies on production equipment that the brand has recently expanded through industrial investment.
The carbon monoxide range separates the two families
The choice between the two ranges is determined by the user. The testo 330 measures up to 40,000 ppm of carbon monoxide, with integrated dilution protection; the testo 320 is limited to 10,000 ppm . The former is designed for installations where high levels are expected, both during installation and maintenance. The latter covers routine measurements of heating systems, with simultaneous collection of multiple readings and fast charging via USB-C.
The five models are further distinguished by their nitrogen monoxide sensor, which is either integrated or optional. The warranty is based on the range, not the specific model: four years plus one for the testo 330, and two years plus one for the testo 320. The table below summarizes these three criteria.
| Model | CO measurement range | NO sensor | Guarantee |
|---|---|---|---|
| testo 330 LL Pro | 10,000 ppm | Scalable | 4 + 1 years |
| testo 330 LL Premium | 10,000 ppm | Scalable | 4 + 1 years |
| testo 330 LL Premium NO | 10,000 ppm | Integrated | 4 + 1 years |
| testo 320 Initial O₂, CO | 10,000 ppm | 2 + 1 years | |
| testo 320 Pro O₂, CO/H₂ | 10,000 ppm | Scalable | 2 + 1 years |
Each analyzer is also offered as a kit, including a compact smoke probe, a spare particle filter, a plug-in power adapter, and a backpack. A Bluetooth printer remains available as an option for situations where the report must be submitted on paper. The press release does not specify the detailed contents of each kit for the chosen model.
Bluetooth transmits the measurement remotely; the application generates the certificate.
The wireless connection links the instruments to each other rather than to a single workstation. An ambient carbon monoxide probe is added to the analyzer for measurements compliant with CNPG recommendations, and the testo 510 differential pressure gauge handles the draw-off. The operator no longer has to copy values from one device to another, a process prone to transcription errors.
The data is automatically uploaded to the testo Smart app, where it is centralized and then integrated into reports generated on-site. This isn't the first update to the app; two additions in 2024 have already enhanced it. It now offers remote control and a second screen, and allows users to create, edit, and archive maintenance certificates without re-entering data. The testo Smart Connect service then synchronizes this data with the cloud, making it accessible to teams regardless of the job site.
The testo 862 camera is available in two resolutions
The second part of the announcement was the testo 862 connected thermal imaging camera, which fits in a pocket and features a smartphone-inspired interface. It comes in two versions: the testo 862-1 with 160 × 120 pixels and the testo 862-2 with 256 × 192 pixels. Their thermal sensitivity is rated at 50 mK at +25 °C, a value that determines the precision of detectable temperature differences.
Fusion mode overlays the thermal image onto the real-world image for easier interpretation. It also includes configurable alarms for exceeding a temperature threshold, Delta T calculation, hot and cold spot detection, and mold risk analysis. The camera boasts IP54 protection and resistance to drops from a height of 1,5 meters. This approach to building HVAC is more akin to routine monitoring than thermographic analysis.
What does thermography look for?
The applications mentioned cover several trades: heat loss, hidden construction defects, sludge buildup on radiators, leaks in heating, air conditioning, and refrigeration systems, and preventive maintenance of electrical installations. These situations require different image interpretations and different operator experience. Thermography applied to buildings is, in fact, the subject of specific training.
An isolated thermal image shows a temperature difference without indicating its cause. The camera therefore connects via Bluetooth to the testo 605i thermo-hygrometer, which locates damp areas exposed to mold, and to the testo 770-3 clamp meter, which reports heat gain relative to current consumption. The free testo IRSoft software then converts the images into PDF reports. Two kits from this manufacturer incorporate these combinations : an electrical inspection kit and a mold inspection kit, both based on the testo 862-2.
The press release mentions neither price, nor availability date, nor distribution network. It also does not specify what will happen to previous generations of these analyzers, nor whether existing probes will remain compatible. This information remains to be obtained from the manufacturer.
Frequently asked questions about the new Testo devices
What is the difference between Testo 330 and Testo 320?
The measurement range is primarily for carbon monoxide. The testo 330 goes up to 40,000 ppm with integrated dilution protection, while the testo 320 stops at 10,000 ppm. The former is designed for the high levels expected in installation and maintenance, the latter for routine measurements.
How many models make up the new range of analyzers?
Five in total. Three for the testo 330: the LL Pro, LL Premium, and LL Premium NO, with a 4 + 1 year warranty. Two for the testo 320: the Initial O₂, CO and Pro O₂, CO/H₂, with a 2 + 1 year warranty. They are distinguished by their nitrogen monoxide sensor.
What difference does the Bluetooth connection make during an intervention?
It connects the instruments. An ambient carbon monoxide probe enables measurement in accordance with CNPG recommendations, and the testo 510 differential pressure gauge handles the draw. Values are no longer copied from one device to another, thus eliminating transcription errors.
Is the maintenance certificate written on the site of the intervention?
This is the intended use. The data is automatically uploaded to the testo Smart app, which centralizes the readings and generates the report on-site. The certificate can then be printed and digitally archived, and the testo Smart Connect service synchronizes everything with a cloud accessible to the teams.
How do the two versions of the testo 862 camera differ?
By definition of the detector. The testo 862-1 delivers 160 × 120 pixels, the testo 862-2 delivers 256 × 192. Both advertise a thermal sensitivity of less than 50 mK at +25 °C, IP 54 protection and resistance to a drop of 1,5 meters.
What instruments connect to the thermal camera?
Two are mentioned. The testo 605i thermo-hygrometer locates damp areas prone to mold growth, and the testo 770-3 clamp meter measures heat gain relative to current consumption. The free testo IRSoft software converts the images into PDF reports. Two kits combine these devices around the testo 862-2.
Glossary of measurement terms in climate engineering
Combustion analyzer
A portable instrument that collects fumes from a boiler to measure their composition and temperature. It is used for burner adjustment and regulatory inspection of the installation.
Carbon monoxide
A colorless and odorless gas produced by incomplete combustion. Its concentration in the flue gases indicates a problem with the regulation or venting system, and its presence in the ambient air constitutes an immediate danger.
Part-per-million
The unit of concentration, denoted ppm, expresses the number of molecules of a gas per million molecules of air. It is used to limit the measurement range of a sensor.
Draw
Pressure difference that forces fumes towards the exhaust duct. Insufficient or excessive draft disrupts combustion; it is measured with a differential pressure gauge.
Infrared thermography
An imaging technique that reproduces the surface temperatures of an object in the form of an image. Applied to buildings, it reveals defects invisible to the naked eye without opening the wall.
Thermal sensitivity
The smallest temperature difference that an infrared detector can distinguish, expressed in millikelvins. The lower the value, the more clearly faint contrasts appear on the thermal image.
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