1. Introduktion
The TROTEC BM31 is an electronic moisture indicator designed for quick and easy detection of near-surface moisture in various materials. It helps locate moisture distribution in walls, floors, or ceilings efficiently.
This device utilizes a dielectric measurement process, ensuring non-damaging moisture indication without the need to insert electrodes or probes into the material being measured.
The BM31 offers quick response times and provides useful information such as minimum and maximum values on its highly readable backlit screen. The instantaneous measurement value can also be held using the hold function.
It is suitable for rapid assessment of moisture levels in diverse materials and serves as a practical preliminary inspection tool for building material readiness in CM measurements.

Figur 1: Front view of the TROTEC BM31 Moisture Meter, showing the display and control buttons.
2. Sikkerhedsoplysninger
Please read this manual carefully before operating the device. Keep this manual in a safe place for future reference.
- Udsæt ikke enheden for ekstreme temperaturer, direkte sollys eller høj luftfugtighed.
- Undgå kraftige stød eller at enheden tabes.
- Forsøg ikke at åbne eller ændre enheden. Reparationer bør kun udføres af autoriseret personale.
- Opbevar enheden utilgængeligt for børn.
- Bortskaf batterier i henhold til lokale regler.
3. Pakkens indhold
Standardpakken indeholder:
- TROTEC BM31 Moisture Meter
- 2 x AAA-batterier (forinstalleret eller medfølger separat)
- Brugermanual
4. Opsætning
4.1 Batteriinstallation
The TROTEC BM31 operates on 2 AAA batteries. Ensure batteries are correctly inserted according to polarity markings.
- Find batteridækslet på bagsiden af enheden.
- Åbn låget.
- Isæt 2 AAA-batterier, og overhold den korrekte polaritet (+/-).
- Luk batterirummets dæksel forsvarligt.
4.2 Tænd/sluk
Tryk på Magt button (usually marked with a power symbol) to turn the device on or off. The backlit display will illuminate upon activation.
5. Betjeningsvejledning
5.1 Grundlæggende måling
The BM31 uses a non-invasive dielectric measurement method. To perform a measurement:
- Tænd for enheden.
- Place the spherical sensor head firmly against the surface of the material you wish to measure.
- The moisture value will be displayed instantly on the screen.
- Move the device across the surface to identify areas with higher or lower moisture content.

Figur 2: Illustration of the non-destructive dielectric measurement principle, showing the sensor detecting moisture beneath the surface.

Figur 3: The BM31 in use, measuring moisture on a tiled floor surface.

Figur 4: The BM31 being used to detect moisture in a brick wall.
5.2 MIN/MAX-funktion
Tryk på MIN / MAX button to display the minimum or maximum moisture value recorded during a measurement session. This is useful for identifying the driest or wettest points in an area.
5.3 HOLD-funktion
Tryk på HOLDE button to freeze the current measurement value on the display. This allows you to read the value more comfortably, especially in hard-to-reach areas. Press the button again to release the hold and resume live measurement.
5.4 Baggrundslys
The display features a backlight for improved readability in low-light conditions. Press the Lys button (often marked with a sun or light bulb symbol) to toggle the backlight on or off.
6. Vedligeholdelse
6.1 Rengøring
Rengør enheden med en blød, damp cloth. Do not use abrasive cleaners or solvents. Ensure the sensor head is free from dirt or debris for accurate measurements.
6.2 Opbevaring
Når enheden ikke er i brug i længere perioder, skal batterierne fjernes for at forhindre lækage. Opbevar enheden et køligt og tørt sted, væk fra direkte sollys og ekstreme temperaturer.
7. Fejlfinding
- Enheden tænder ikke:
- Kontroller om batterierne er korrekt isat.
- Udskift batterierne med nye.
- Unøjagtige aflæsninger:
- Ensure the sensor head is clean and free of obstructions.
- Verify that the device is placed firmly and flat against the surface.
- Consider environmental factors like extreme temperature or humidity affecting the material itself.
- Displayet er svagt eller flimrende:
- Batterierne kan være lave; udskift dem.
8. Specifikationer
| Fabrikant | Trotec |
| Modelnummer | 3510205031 |
| Produktdimensioner | 180 mm (Højde) x 45 mm (Bredde) x 35 mm (Dybde) |
| Vægt | 180 gram |
| Batterier | 2 x AAA (inkluderet) |
| Operationel fugtighed | 10 % til 90 % |
| Øvre nominel temperatur | 22°C |
| Temperatur nøjagtighed | ±2°C |

Figur 5: The TROTEC BM31 with its approximate dimensions (180mm height, 45mm width) indicated.
9. Garanti og support
For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official TROTEC webwebsted. Gem din købsbevis til garantikrav.





