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315-4 CO Measurement Instrument

Testo 315-4 CO Measuring Instrument designed to record ambient Carbon monoxide (CO) values. It identifies even the slightest concentrations of this highly toxic gas.

Part Number:
0632 3155

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Testo 315-4 CO Measuring Instrument

The testo 315-4 CO (carbon monoxide) is a convenient, precise and robust measuring instrument for recording ambient CO values. It identifies even the slightest concentrations of the highly toxic gas. This allows you to safely judge whether, e.g. ambient air-dependent heating systems can be operated without danger.

Testo 315-4 Key Features:

  • State-of-the-art technology
  • Easy to use
  • Robust design
  • View measurements directly on the digital display
  • TÜV-tested according to EN 50543
  • Electrochemical CO sensor for reliable and highly precise measurement results
  • Optical and audible alarm when limit values are exceeded (freely adjustable limit values)
  • Printout of measurement data possible directly on site
  • Energy-saving operation: when not in use, it switches off automatically
  • Tune up your CO measuring instrument with a range of accessories for even more possibilities
    • TopSafe protective casing: water and dirt repellent, provides protection in wet and dirty conditions
    • Testo turbo printer: print out on-site
    • Temperature/humidity module: carry out quick and reliable temperature and humidity measurement

Example 315-4 Applications:

Carbon monoxide (CO) is a colourless, odourless, taste-free gas but it is poisonous. Its sources include the incomplete combustion of substances containing carbon for example: oil, gas and solid fuels. This is why it‘s necessary to regularly check CO emissions at the combustion points of heating systems and their surroundings.

There is also the option on the 314-5 to measure humidity and temperature in parallel.

What comes with the Testo 315-4?

  • testo 315-4 CO measuring instrument for ambient measurements
  • USB mains unit and cable
  • Calibration protocol


Comparison Chart for: Testo 315-4 CO Measurement Instrument

Attachable humidity module - Capacitive
Measuring range+5 to +95 %RH+5 to +95 %RH
Accuracy±25.0 %RH (5 to +95 %RH)±2.5 %RH (5 to +95 %RH)
Resolution0.1 %RH0.1 %RH
Ambient CO
Measuring range0 to 100 ppm0 to 100 ppm
Accuracy±3 ppm < 20 ppm±3 ppm (0 to 20 ppm)
±5 ppm > 20 ppm±5 ppm (>20 ppm)
Resolution0.5 ppm0.5 ppm
Ambient CO₂
Measuring range0 to 10000 ppm
Accuracy±300 ppm (0 to 4000 ppm)
8 % of mv (4000 to 6000 ppm)
500 ppm (6000 to 10000 ppm)
Resolution10 ppm
Measuring range-10 to +60 °C-10 to +60 °C
Accuracy±0.5 °C (±1 Digit)±0.5 °C (±1 Digit)
Resolution0.1 °C0.1 °C
General technical data
Operating humidity0 to 95 %RH0 to 95 %RH
Dimensions190 x 65 x 40 mm190 x 65 x 40 mm
Operating temperature0 to +40 °C0 to +40 °C
InterfaceIR/IRDA interfaceIRDA / optional Bluetooth
Storage battery typeLithium polymer battery packLithium polymer rechargeable battery
Battery chargeIn instrument via chargerIn instrument via charger
Battery life70 h measurement time (at +20 °C/+68 °F) / Mains operation possible10 h measurement time (at +20 °C/+68 °F) / Mains operation possible
Storage temperature-20 to +60 °C-20 to +60 °C
Weight200 g200 g
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