Pyrometer dew point scanner BP25
Pyrometer dew point scanner BP25
Pyrometer dew point scanner BP25
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Pyrometer dew point scanner BP25

Combined 4-in-1 infrared measuring device to prevent mould growth: measurements of surface temperature, air temperature and humidity level supplemented by an automatic dew point alarm

BP25 – dual laser
BP25 – dew point alarm display
BP25 – pyrometer dew point scanner

Quick and easy dew point determination

Rely on Trotec's BP25 – it was tested by the consumer comparison portal VERGLEICH.ORG and has been awarded for the best value-for-money ratio!

If condensate forms frequently at the same spot, it usually doesn't take long until mould grows as well. Used for private purposes or commercially – the high-quality pyrometer dew point scanner BP25 provides you with the opportunity to check surfaces such as interior walls and facades for cold spots with a high mould growth potential. Infrared non-contact surface temperature measurements at walls can be carried out quickly and easily; the dew point temperature is automatically determined at the same time. Even in unfavourable lighting conditions the measured values can easily be read on the neatly arranged backlit LC display. The measuring spot is displayed on the respective material to be measured by means of the integrated 20:1 dual laser.

In order to determine the dew point, the device additionally measures the current room temperature and the humidity level in the air. When it comes to larger measuring surfaces, the BP25 with its acoustic and visual alarm function, which is based on the traffic light principle, as well as its integrated bar graph indicator offers you quick information on whether or not the dew point at the measuring location has been reached or even fallen below and comes with an increased risk of mould growth due to condensation. Mould begins to form on material surfaces when they are exposed to an increased relative humidity of approx. 70 % for longer periods. For this reason, the BP25 warns you both acoustically and visually several degrees before reaching the actual dew point. So it pays to inspect cold spots at the wall with the BP25 in order to detect any condensation forming at an early stage.

Keeping an eye on the measuring spot at all times thanks to the 20:1 measuring optic

Using the infrared pyrometer BP25 you can measure the surface temperature of walls, materials and objects without the need for contact. To enable you to better estimate the location and dimensions of the measuring spot, the BP25 comes equipped with a dual laser pointer. It projects two laser dots indicating the measuring spot diameter on the surface to be measured. An infrared sensor measures the temperature value in this area, then an average value is determined. Bear in mind: the smaller the measuring spot, the more precise the measuring result – and the greater the distance between measuring device and measuring object, the larger the measuring spot diameter. Owing to its geometric resolution of 20:1 the hand-held measuring device yields accurate measurements even from a distance of a few metres.

Is everything in the green range or is there a risk of mould growth?

In addition to performing infrared surface temperature measurements the BP25 can make use of an air temperature sensor and a humidity sensor (measuring range between 0 % and 100 % relative humidity), then the dew point temperature is automatically calculated from the 3 determined values. On top of the precisely displayed values an acoustic signal and/or the change of the LC display colour can optionally indicate whether or not the measured values are within the critical range. A green display indicates that everything is fine, orange means that the measured values are drawing near the critical dew point and a red display clearly warns you that the determined temperature is precariously close to the dew point or that is has already been reached or was even fallen below indicating the possibility of condensate formation. If desired, you can also work by ear, i.e. guided by the acoustic signal that will be emitted with increasing frequency.

Especially when measuring large wall surfaces the acoustic and/or visual alarm helps to quickly detect critical positions without having to pay attention to the precise measured values the entire time. The display also contains an easily comprehensible bar graph indicator. It serves for a quick orientation and illustrates schematically on a scale of 0 % to 100 % how close the measured values are to the dew point temperature.

BP25 – traffic light principle

Explained in easily understandable terms: What exactly is the dew point?

The room air that surrounds us contains moisture. Especially the humidity levels in the bathroom, kitchen or bedroom are often elevated. What can be said in general is that the warmer the air, the more water vapour can be absorbed. Conversely, though, this means that when warm, damp air meets a colder surface and the air cools down, the contained moisture condenses and forms ultra-fine droplets of water on the cold surface. Now, the so-called "dew point" or "dew point temperature" is the temperature value to be reached or fallen below in order for the room air to release the moisture in form of condensate. You probably know this effect from a cold mirror in the bathroom that immediately fogs up when you take a hot shower. Condensate forms particularly often at poorly insulated wall parts and so-called "thermal bridges", since the temperatures of interior walls there are often colder than the rest of the wall.

Be it in corners, behind wardrobes and cupboards, in the basement or attic, near doors and windows or on the inside of insufficiently insulated exterior walls – to determine whether or not there is going to be a risk of mould growth in the long run we recommend checking the wall temperature on a regular basis. Ideally perform the measurements at different times of the day (in the early morning, during the day, in the evening and at night), in varying weather conditions and in all seasons to make sure no condensate forms at those critical spots.

Once mould has formed, it is hard to get rid of. On the other hand, using the pyrometer dew point scanner BP25, a conclusive control measurement is carried out quickly and easily.

BP25 – When is the dew point reached?
BP25 – used in the basement
BP25 – used at home

Extremely versatile

Owing to the broad temperature measuring range between -50 °C and 260 °C the versatile BP25 recommends itself for many more applications other than just the one as dew point scanner. The non-contact infrared measurement means you are reliably protected from too cold or too hot surfaces.

You can measure the temperature of heating systems, hot pipes, tanks, boilers, motor blocks, control boxes or cold stores without risking to get your fingers burned or stuck to an ice-cold surface. The BP25 can even be applied during the preparation of baby food – simply check the optimum drinking temperature of the baby bottle's contents from outside.

Combining a decided use of forms and a high degree of functionality in one design

As you can see, the BP25 in practice-optimized Trotec design impresses across the board. With its compact dimensions and the light weight of merely 163 g the device can easily be carried along in your jacket pocket. Also, a convenient bag to be attached to your belt is included in the scope of delivery.

The infrared thermometer is powered by the supplied 9 V battery. Via the battery charging status indication on the LC display you can easily keep an eye on the current charging status. To ensure maximum battery runtime the BP25 is automatically switched off in case of non-use to save energy – as a result you can use the pyrometer dew point scanner BP25 for a vast number of measuring applications.

BP25 – extremely versatile

Tested and awarded with the rating GOOD

In the February of 2019 Trotec's dew point scanner BP25 has been tested and awarded for the best value-for-money ratio with the overall rating GUT (GOOD). In direct comparison with other infrared thermometers the BP25 could win the testers over.

Best value "GOOD"

Sophisticated in every detail, the infrared dew point scanner BP25 will not disappoint your expectations

Compact dimensions and excellent handling characteristics: the infrared dew point scanner BP25 is a practical aid for fast and reliable dew point determination as well as surface temperature measurements.
BP25 – dimensions
Using the BP25 you can measure the room and surface temperature in a range between -50 °C and 260 °C. The humidity level ranging between 0 % and 100 % is determined as well. Based on these three measured values the BP25 then automatically calculates the current dew point temperature.
BP25 – measuring range
To let you know at first glance whether or not the dew point has been reached, the display colour will simply turn green (normal), orange (critical) or red ( dew point alarm). In addition to this traffic light principle you can also activate an acoustic alarm and the bar graph indicator on the right-hand side of the screen provides further guidance.
BP25 – dew point alarm
In order for you to estimate the position of the measuring spot on the surface, the infrared pyrometer BP25 comes equipped with a dual laser. The measuring optic's ratio of the distance to the measuring spot amounts to 20:1.
BP25 – dual laser
A supplied 9 V battery ensures the power supply of the BP25. The current power level will indicated on the display in per cent. And for a particularly long battery runtime the BP25 is automatically switched off in case of non-use.
BP25 – 9 V battery
Trotec's pyrometer dew point scanner BP25 also convinced the independent consumer comparison portal VERGLEICH.ORG. The practical hand-held measuring device was tested and awarded for the best value-for-money ratio with the rating GOOD. Despite its new design the technology within the BP25 is still identical to the tested model.
BP25 – protection type IP54
Development, design, production – 100 % Trotec. The high-quality BP25 supplied in the distinctive Trotec industrial design impresses with a decided use of forms and a high degree of functionality.
BP25 – Trotec design
Convenient, protected and always at hand – with the belt bag included in the scope of delivery you can carry the BP25 along to all application sites and still have your hands free.
BP25 – belt bag

Simply practical for commercial applications or use at home

Painters, masons, tilers, facility managers, restoration companies or experts, using the pyrometer dew point scanner BP25 each can easily watch out for potentially forming mould stains.
BP25 – for professionals
Mould is harmful to health and really hard to get rid of once it has settled in your home. The automatic dew point alarm of the BP25 permits you to intervene and prevent mould growth at an early stage because you can detect and regularly inspect critical positions at the wall.
BP25 – for private users

A few practical benefits:

  • Measuring the surface temperature, air temperature, relative humidity and dew point temperature with just one device
  • Dew point alarms indicated by a change of display colour, acoustic alarm signal and bar graph indicator
  • Non-contact infrared surface temperature measurements from -50 °C to 260 °C
  • Measuring optics 20:1
  • Measuring spot diameter display due to dual laser pointer
  • Backlit display
  • Automatic switch-off function
  • Development, design, production: 100 % Trotec
  • Practice-optimized German industrial design – protected design patent
  • Optimum value-for-money ratio


Technical data

Technical data
General information
  Article number 3.510.003.035
  Optical resolution (D:S) 20:1
  Smallest measuring spot Ø 25.4 mm (Distance 508 mm)
Infrared temperature sensor [°C]
  Min. measuring range [°C] -50
  Max. measuring range [°C] 260
  Max. accuracy [°C]
  Accuracy < -4°C
  Accuracy -4°C to 65 °C
  Accuracy > 65 °C
  Accuracy < 20 °C ± 3.5
  Accuracy = 20 °C 1 % ± 1.5
  Accuracy -50 °C to 20 °C (-58 °F to 68 °F) 1 % ± 1.5
  Accuracy 20 °C to 500 °C (68 °F to 932 °F)
  Accuracy 21 °C to 300 °C
  Accuracy 301 °C to 1,000 °C
  Accuracy 21 °C to 400 °C
  Accuracy 401 °C to 800 °C
  Accuracy 800 °C to 1,600 °C
  Repeatability -50 °C to 20 °C
  Repeatability 21 °C to 1,000 °C
  Repeatability 21 °C to 1,200 °C
  Repeatability 1,201 °C to 1,600 °C
  Accuracy 500 °C to 1,000 °C (932 °F to 1,832 °F)
  Accuracy 1,000 °C to 1,850 °C (1832 °F to 3,362 °F)
  Repeatability 20 °C to 1,000 °C (68 °F to 1,832 °F)
  Repeatability 1,000 °C to 1,850 °C (1832 °F to 3,362 °F)
Infrared temperature sensor [°F]
  Min. measuring range [°F] -58
  Max. measuring range [°F] 500
  Accuracy ± min. [°F]
  Accuracy ± Max. [°F]
Integrated temperature probe [°C]
  Min. measuring range [°C] 0
  Max. measuring range [°C] 50
  Accuracy ± min. [°C] 1.5
  Accuracy ± Max. (10 °C to 40 °C) [°C] 1
  Accuracy ± 0 °C to 200 °C (32 °F to 392 °F) [°C]
  Accuracy ± =0 °C [°C]
Integrated temperature probe [°F]
  Min. measuring range [°F] 32
  Max. measuring range [°F] 122
  Accuracy ± < 23 °F to 150 °F [°F]
  Accuracy ± > 150 °F [°F]
Dew point temperature [°C]
  Min. measuring range [°C] -30
  Max. measuring range [°C] 100
  Accuracy ± 2.0 %
  Min. measuring range [%] 0
  Max. measuring range [%] 100
  Accuracy [%] ±3.5 % (20 % RH up to 80 % RH)
Ambient conditions
  Operation - min. temperature [°C]
  Operation - max. temperature [°C]
  Operation – min. relative humidity [% r.F.]
  Operation - max. relative humidity (non-condensing) [%]
  Storage - min. temperature [°C]
  Storage - max. temperature [°C]
  Storage - max. relative humidity (non-condensing) [%]
  Plug connection for type K temperature sensor
Memory organisation
  Internal flash memory
Device control
  Push buttons
  Membrane keyboard
Type of protection
Temperature sensor
  Response time < 150 ms
  Spectral sensitivity 8 - 14 µm
Laser (target display)
  Wavelength [nm]
  Power [mW]
Power supply
  Internal (battery) 1 x 9 V battery
  Internal (battery)
  External (USB)
Housing design
  Length (packaging excluded) [mm] 168
  Width (packaging excluded) [mm] 58
  Height (packaging excluded) [mm] 82
  (packaging excluded) [kg] 0.163
Standard scope of delivery
Standard scope of delivery
  Measuring device
  Operating manual
  Contact temperature sensor type K
  Carrying case
  USB cable
  Mini tripod
Ascertainable measured values and functions
Internal sensors
  Dew point temperature [°F]
  Air temperature [°C]
  Air temperature [°F]
  Material temperature [°C]
  Material temperature [°F]
  Relative humidity [%]
  Dew point temperature [°C]
Functions and features
  Switching function °C/°F
  Automatic switch-off
  Backlit display
  Selectable dual laser
  Acoustic dew point alarm
  Visual dew point alarm
  Bar graph indicator for the quick identification of condensation risks
  Battery status indication
  Display resolution 0.1°C
  Non-stop measuring function
  Maximum value display
  Minimum value display
  Measured value hold function
  Differential value display
  Alarm function with user-defined limit values
  Acoustic alarm function
  HACCP quick indicator LED
  Degree of emission adjustable from 0.1 to 1.0
  Maximum value indication
  Open targeting sights
  Additional temperature measurement using external type K sensor
  Additional material temperature measurement using integrated type K insertion sensor
  Applicable for software-supported recording of measurement series
  Tripod thread connection
  Meets the specifications of the LFGB, §31 (German Food and Feed Code)
  Conforms with DIN 10955:2004
  Selectable single laser pointer
  Battery status indication
  Timer function
  Material temperature [°C]
  Material temperature [°F]

 standard equipment

 optionally available

 not available



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