Trotec BP21 User Manual

4 EN
pyrometer BP21
Information about the device
Device description
The pyrometerBP21 uses an infrared sensor to measure
surface temperatures without contact. An integrated dual laser
pointer can be switched on for the precise determination of the
measuring spot diameter.
You can set the emissivity of the material to be measured so as
to achieve a more precise measurement result.
For the temperature measurement the device allows you to set
freely definable thresholds. Exceeding or falling below these
preselected thresholds is indicated by an acoustic alarm
function.
In addition, the device indicates either the highest or lowest
value of the measurement.
The display can be illuminated as needed. When not in use, an
automatic switch-off saves the battery.
Measuring principle
The device measures the temperature by means of an infrared
sensor. Important factors playing a role in the temperature
measurement are the measuring spot diameter and the
emissivity.
Measuring spot
Observe the distance to measuring spot diameter ratio. The
larger the distance to the object, the larger the measuring spot
diameter and hence, the less precise the measured result, for
the device calculates an average temperature from all the
temperatures in the measuring spot.
Spot 12.5 mm 100 mm
Distance 150 mm 1200 mm
D:S = 12:1
Laser
Infrared
Emissivity
Emissivity is a value used to describe the energy radiation
characteristics of a material.
Most organic materials have an emissivity of0.95. Metals or
shiny materials come with a much lower value.
A material's emissivity depends on various factors, e.g. on
• Material composition
• Surface condition
• Temperature
The emissivity can range between 0.1 and 1 (in theory).
The following rule of thumb can be assumed:
• When a material is rather dark and its surface texture matt,
it probably has a high emissivity.
• The brighter and smoother the surface of a material, the
lower will be its emissivity, presumably.
• The higher the emissivity of the surface to be measured,
the better it is suited for non-contact temperature
measurement by use of a pyrometer or thermal imaging
camera, since falsifying temperature reflections become
negligible.
Nevertheless, entering an emissivity as appropriate as possible
is indispensable for a precise measurement.

Trotec BP21 Specifications

General

Brand	Trotec
Model	BP21
Category	Measuring Instruments
Language	English