M Easurement M Ethod - Maxwell Digital Multimeters 25903 Anwendungshandbuch

Do not expose the device to extreme ambient
•
temperatures.
Always keep the thermometer clean, especially
•
the sensor optics.
Do not use solvents for cleaning.
•
M p
easUring
Infrared thermometers detect the infra energy
emissions of various materials. The device
focuses these energy beams on the sensors,
converts the surface temperature into electronic
signals, and a microcomputer calculates and
displays the temperature on the LCD display.
The device measures the surface temperatures
of an object without direct contact. Point the
laser onto the measured object only.
M
easUreMent
To measure the temperature of an object
•
point the device onto the object and pull the
trigger. For continuous measurement keep the
trigger pulled. The LCD display will show the
measured value even is the trigger is released.
The primary temperature display shows the
current value, while the secondary shows the
preset calculated data (average, MAX, MIN,
MAX-MIN).
If the object is far away you can aim the laser
•
pointer at it.
For nighttime measurement turn on the
•
backlight.
By pressing the MODE button we can change
•
the mode of the secondary display to the
following:
AVG = average
•
MIN = minimum measured value
MAX = maximum measured value
MAX-MIN = the highest measured value
extracted from the minimum value results.
(MIN-MAX difference)
By pressing the ºC/ºF buttons you can select
•
the ºCelsius or ºFahrenheit value.
For measuring ambient temperature just
•
simply press the „TAMB" and keep the trigger
pulled.
The primary displays shows the temperature
•
of the object, while the secondary shows the
temperature of the object's environment.
rinciple
M
etHod
d:s r
ate
(d :s
istance
The device has a visual angle and an optical
space size; please see the below diagram:
P
P=Object F=Focus SE=Sensor
Make sure that the object is larger than the
optical space size unit. To make the object
smaller you need to bring the device closer to it.
The rate between the distance and the space
size is 8:1, as displayed below:
S
150 100
800
1200
D:S = 8:1
D=Distance S=Spot
To protect the sensor from another object's infra
light go closer to the object until the ratio is D:S
= 8:1.
e
Missivity
Emissivity describes the characteristics of
energy emission for materials. Enhancement
of emissivity means enlarging the emission
capacity for an object.
Organic materials and oxidized metal
surfaces have an emissivity between 0,85 - 0,
98. The device was designed in a way that
if the emissivity equals 0,95 the measured
temperature will be lower than the actual
temperature and vica versa.
A shiny metal surface or a smooth polished
surface has low emissivity. Pay special attention
to the effects of emissivity.
EN
User Manual
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pot
F SE
50
400
D