Measuring surface temperature: infrared or contact probe?
The measurement location determines how useful a temperature reading is. An infrared thermometer measures an area; its laser marks only the centre. A contact probe provides a local reading but needs time to stabilise. Choose the method according to the actual surface to be assessed and its accessibility.
Products and methods at a glance
| Method / parameter | Meaning / application | Practical decision |
|---|---|---|
| Infrared thermometer | Fast non-contact check | Keep the entire measurement spot on the target. |
| Contact probe | Local surface temperature | Ensure good contact and wait for stability. |
| Magnetic thermometer | Continuous indication on steel | Allow temperature adjustment time. |
Settings and assessment framework
The guide gives the Elcometer 214L as an 8:1 example. At 200 mm distance, its measurement spot is about 25 mm. Check the actual ratio, emissivity and temperature range in the instrument manual.
Professional workflow
- Define the target and permitted temperature.
- Inspect the surface and accessibility.
- Choose a suitable measurement method.
- Set infrared distance or contact position.
- Take stable readings at relevant locations.
- Record method, location and deviations.
Troubleshooting
Implausible infrared value
Reduce distance; check emissivity and reflections.
Drifting contact reading
Wait for stability; improve contact.
Sun affects results
Account for local heating; measure other locations.
Laser suggests a point reading
Calculate spot size; choose a sufficiently large target.
Maintenance and quality assurance
- Keep optics clean.
- Clean probe contact surfaces.
- Inspect cables for damage.
- Compare against a reference.
- Store the instrument securely.
FAQ
Does the laser measure temperature?
No, it is a targeting aid.
Why consider distance?
The measurement area grows with distance.
Is infrared always more accurate?
No, surface properties and measurement conditions affect suitability.
Why wait with a contact probe?
The probe needs to reach surface temperature.
Does Ts replace climate testing?
No, humidity and dew point remain relevant.
Conclusion
The right temperature measurement prevents decisions based on the wrong area. Beschicht.com helps you choose suitable thermometers and surface probes.
Explore inspection equipment at Beschicht.comSources and sections used
German - Elcometer Guide to Climatic Testing_corrections (1).docx
- Measuring surface temperature
- Measuring air temperature
