testo 350 analyzer box

testo 350 analyzer box, equipped with O2, incl. differential pressure sensor, temperature probe input Type K NiCr-Ni and Type S Pt10Rh-Pt, connection Testo databus, rech. battery, integrated combustion air probe (NTC), trigger input, measurement data store, USB interface, updatable to max. 6 gas sensors selected from CO, COlow, NO, NOlow, NO2, SO2, CO2 NDIR, CxHy, H2S

  • Innovative: The application-guided operation with helpful instrument pre-settings
  • Elegant and clear: The large colour graphic display
  • Robust design: The sealed housing makes the testo 350 insensitive to knocks and dirt
  • Cost and time-savings: The new service concept offers fast access to wearing parts
330 x 128 x 438 mm
4800 g
Storage temperature
-20 ... +50 °C
Operating temperature
-5 ... +45 °C
250.000 Measurement values
Max. pos. pressure flue gas:
max. +50 mbar
Max. neg. pressure
min. -300 mbar
Battery life
Maximum load approx. 2.5 h
Protection class
IP 40

The robust housing has built-in impact protection (specially constructed X-shaped rubber edges), allowing the analyzer box to be used in tough conditions. Downtimes due to dirt in the instrument are almost completely eliminated by intelligent design and robustness. Inherently sealed chambers protect the interior of the instrument from dirt from the surroundings. Operation can be carried out with the control unit or in derict connection with a PC or notebook (USB, Bluetooth® 2.0 or CANCase). The analyzer box can, after programming, independently carry out measurements and store measurement data.

The plug-in connections for the probes and bus cables are locked by bayonet fittings, and therefore securely connected to the analyzer box. This prevents unintentional removal, avoiding false measurements.

The advantages of the analyzer box:

  • Special chambers offer comprehensive protection for the sensors and electronics from dust and deposits.

The new flue gas analyzer testo 350 offers insights and creates transparency ...

Easily accessible service opening


The service opening in the underside of the instrument allows very easy access to all relevant service and wearing parts such as pumps and filters, which can then be quickly cleaned and/or exchanged on site.

The advantages:

  • Reduction of instrument unavailability due to service times.
  • Cost savings due to instrument maintenance and/or exchange and cleaning of wearing parts by the user.
  • Immediate access to all relevant wearing parts

Thermally separated sensor chamber


The sensor chamber is thermally separated from the other instrument components. This reduces possible sensr drifts caused by thermal influences.

This allows the maximum reliability pf the measuring instrument to be achieved.

Easy exchange of the gas sensors


The gas sensors are pre-calibrated and can be exchanged, replaced or extended by further measurement parameters without test gas – if necessary directly on site.

The advantages:

  • No more long service times
  • Flexible extension of the testo 350 by further gas measurement parameters when applications or regulations change.
  • A report is immediately issued when the NO sensor filter is used up. Then only the filter needs to be changed, and no longer the whole NO sensor.

Automatically monitored condensate trap


The automatic monitoring of filling level reports when the condensate trap needs to be emptied, and a few minutes after the report, the measurement gas pump is automatically stopped. This provides the highest protection of the analyzer box and the gas sensors from damage by condensate entry.

External cooling loop


Closed cooling loops isolate the instrument electronics and sensors from the ambient air. The interior of the instrument is cooled via a heat exchanger and therefore does not come into contact with dirty or aggressive ambient air.

The advantages:

  • Damage to the internal electronics are thus effectively prevented.
  • The instrument can also be safely used in dusty or dirty atmospheres.



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