EN
Manual XC250
11
Laser pointer
Risk from laser radiation!
Class 2 laser radiation.
Lasers of class 2 only radiate in the visible range and
during continuous wave operation (lasting beam) no
more than 1 milliwatt (mW) of output will be emitted.
Looking directly into the laser beam for a longer period
of time (more than 0.25 seconds) can cause damage to
the retina.
Avoid looking directly into the laser beam. Never look
into the laser beam using optical aides. Do not
suppress the winking reflex when looking into the laser
beam unintentionally. Never point the laser beam at
people or animals.
•As soon as operating mode IR or IR DP is selected, the
laser pointer switches on. The laser pointer is on for a
maximum of 2 minutes and can then be reactivated for
another 2 minutes by briefly pressing the OK button (12).
USB interface
The device can be connected to a PC via the USB interface (5).
See chapter PC software on page 12.
Switching off
1. Press and hold the On/Off key (4) for approx. 3 seconds until
a beep is emitted.
– The device will be switched off.
2. If applicable, put the protective cap back on the infrared
sensor.
The device comes with a measuring sensor for air temperature
and humidity.
It is further equipped with an infrared sensor for the measurement
of surface temperatures.
The degree of emission and the ratio of the distance to and the
size of the measuring spot play an important role when using the
infrared sensor for measurements.
Degree of emission
The degree of emission is used to describe the energy radiation
characteristics of a material.
The higher this value, the higher is the ability of the material to
radiate. Many organic materials and surfaces have a degree of
emission of approx. 0.95.
Metal surfaces or shiny materials have a lower degree of
emission and therefore only yield inaccurate measured values.
Please observe this when using the device.
In order to compensate this, the surface of shiny parts can be
covered with adhesive tape or matt black colour.
The device is unable to measure through transparent surfaces
such as glass. Instead it measures the surface temperature of the
glass.
A material's degree of emission depends on various factors such
as the material composition, its surface condition and
temperature. (In theory,) It can be between 0.1 and 1. As a rule of
thumb we can assume: When a material is rather dark and its
surface texture matt, it probably has a high degree of emission.
The brighter and smoother the surface of a material, the lower will
be its degree of emission, presumably. The higher the degree of
emission 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 a degree of emission
as appropriate as possible is indispensable for a precise
measurement.
Measuring distance and measuring spot size (Distance to
Spot ratio, D:S)
In order to achieve precise measurement results the measuring
object must be larger than the device's measuring spot. The
determined temperature is the average temperature of the
measured area. The smaller the measuring object, the shorter the
distance to the device.
You can gather the precise diameter of the measuring spot from
the figure below.
For accurate measurements the measuring object should be at
least twice as large as the measuring spot.
Measuring principle
ø
18
205
400
800
mm
ø35
ø70
D:S = 12:1
