Emissivity
Distance and Spot Size
Field of View
To contact Uni-Trend. call (852) 2950 9168 or visit Uni-
Trend web site at www.uni-trend.com
Introduction
The Model UT301A/B/C,UT302A/B/C/D and
UT303A/B/C/D/E Infrared Thermometers (hereafter referred
to as "the Thermometer") can determine the surface
temperature by measuring the amount of infrared energy
radiated by the target surface. They have different
Distance to Spot(D:S) ratios and
different temperature ranges, read the manual for details.
The Thermometer is a non-contact infrared instrument
designed with low power consumption, which can make
the measurements much faster and easier and meanwhile
save you amount of time from frequent battery replacement.
It can be powered by the battery or the source with USB
connected to.
This Manual uses UT303A/B/C/D/E as illustration.
Contacting Uni-Trend
Warning
Safety Information
A warning identifies conditions and actions that
pose hazards to the user. To avoid electrical
shock or personal injury, follow these guidelines:
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
Do not point the laser toward anyone's eye or allow
the laser to strike the eye from a reflective surface.
Before using the Thermometer inspect the case.
Do not use the Thermometer if it appears damaged.
Look for cracks or missing plastic.
Replace the battery as soon as the battery
indicator
appears.
Do not use the Thermometer if it operates
abnormally. Protection may be impaired.
When in doubt, have the Thermometer serviced.
Do not operate the Thermometer around
explosive gas, vapor, or dust.
To avoid a burn hazard, remember that highly
reflective objects will often result in lower
than actual temperature measurements.
Do not use in a manner not specified by this
manual or the protection supplied by the
equipment may be impaired.
To avoid damaging the thermometer or the
equipment under test protect them from the
following:
EMF (electro-magnetic fields) from arc
welders, induction heaters, etc; static electricity;
thermal shock (caused by large or abrupt
ambient temperature changes-- wait for 30 minutes
for the Thermometer to stabilize before use;
placed on or near objects of high temperature.
Table 1 and Figure 1 show various symbols and safety
markings that are on the Thermometer and in this
manual.
Explanation
Risk of danger. Important information.
See Manual.
Warning. Laser
Conforms to Standards of European Union
Low Battery Indication
Symbol
Table 1. Symbols
Figure 1. Symbols and Safety Markings
Features
The Thermometer includes:
Single Laser Pointer
Intelligent USB-Powered
Level 2 White Backlight(With USB connected,)
this feature will be on automatically).
Current Temperature Plus MIN, MAX, DIF, AVG
Display Functions
Adjustable Emissivity
Trigger Locked
℃
/
℉
Selectable
Tripod mount
One 9V Battery
Thermometer features are shown in Figure 2.
Battery Cover
Display
9V 6F22 Battery
Laser
Trigger
Display
The primary display reports the current or last IR
temperature reading until the 8-second hold time
elapses.
Figure 2. Infrared Thermometer
The secondary display reports a choice of
maximum, minimum, difference between maximum and
minimum temperature or average value.
You can toggle through the maximum, minimum,
difference and average IR temperatures anytime the
display is on. The MAX, MIN, DIF and AV temperatures
are constantly calculated and updated when the trigger
is pressed. After the trigger is released, the MAX, MIN,
DIF and AV temperatures are held for 8 seconds.
A
B
C
D
C
A
D
B
HOLD
SCAN
Laser ìOnî Symbol
SCAN or HOLD
o
C /
o
F S y m b o l ( C e l s i u s / F a h r e n h e i t )
Primary temperature Display
Secondary temperature Display
Emissivity LO, MED, HI
Temperature values for the MAX, MIN,
DIF, AVG
Low Battery symbol. Appears when
the battery charge is <4.5V.
Figure 3. Thermometer Display
Buttons and Connector
Figure 4. Buttons and Connector
Description
Press
MODE
button to toggle between MAX, MIN,
DIF, and AVG options.
Press
MODE
to turn the Thermometer on again
and displays the last measurement result.
Press to enter set up mode stepping through
Emissivity set up, Trigger Lock and Switching
o
C/
o
F set up.
Refer to the below Emissivity, Trigger Lock
and Switching
o
C/
o
F topics for details.
Press
to turn the display backlight on and off.
icon will be on and off also.
When the Thermometer enters the setup up mode,
press
to select an option, refer to the below
Emissivity, Trigger Lock and Switching
o
C/
o
F topics for details.
Press
to turn the laser on and off. After laser
is on,
will be shown.
When the Thermometer enters the user setup
mode, press to select an option, details refer
to the below Emissivity, Trigger Lock and Switching
o
C/
o
F topics.
Button /
Connector
MODE
SET
Table 2. Buttons and Connector
Connect USB cable for supply power to the unit or
data transmission with the software;
Backlight will automatically turn on;
USB
port
How the Thermometer Works
Infrared thermometers measure the surface temperature
of an opaque object. The Thermometer's optics sense
infrared energy, which is collected and focused onto a
detector. The Thermometer's electronics then translate
the information into a displayed temperature reading
which appears on the display. The laser is used for
aiming purposes only.
Operating the Thermometer
Locating a Hot or Cold Spot
The Thermometer turns on when you press the trigger.
The Thermometer turns off when no activity is detected
for 8 seconds.
To measure temperature, aim the Thermometer at the
target, pull and hold the trigger. Release the trigger to
hold a temperature reading.
Be sure to consider distance-to-spot size ratio and filed
of view. The laser is used for aiming only.
To find a hot or cold spot, aim the Thermometer outside
the target area. Then, slowly scan across the area with
an up and down motion until you located the hot or cold
spot. See Figure 5.
Figure 5. Locating Hot or Cold Spot
As the distance (D) from the target being measured
increases, the spot size (S) of the area measured by
the unit becomes larger. The spot size indicates 90%
encircled energy. The maximum D:S is obtained when
the Thermometer is 600mm (60 in) from the target
resulting in a spot size of 20mm (2 in). See Figure 6.
Figure 6. Distance and Spot Size
Make sure that the target is larger than the spot size.
The smaller the target, the closer you should be to it.
See Figure 7.
Figure 7. Field of View
Emissivity describes the energy-emitting characteristics
of materials. Most organic materials and painted or
oxidized surfaces have an emissivity of about 0.95.
If possible, to compensate for inaccurate readings that
may result from measuring shiny metal surfaces, cover
the surface to be measured with masking tape or flat
black paint (<150
o
o
C / 302 F) and use the high emissivity
setting. Allow time for the tape or paint to reach the
same temperatures as the surface beneath it. Measure
the temperature of the tape or painted surface.
If you cannot use paint or use tape, then you could
improve the accuracy of your measurements with the
emissivity selector. Even with emissivity selector, it can
be difficult to get a completely accurate infrared
measurement of a target with a shiny or metallic surface.
The Thermometer allows you to adjust the unit's
emissivity for the type of surface before measured.
Refer to Table 3. But it is only a typical case. You could
base on your own case and materials to have different
setting.
To adjust values for emissivity, follow the below
procedure:
1 .
2 .
3 .
Press
SET
to select emissivity set up, icon
E
on the
display is blinking. The Thermometer steps through
emissivity set up, trigger lock and switching
o
C /
o
F.
Press
to increase the value by 0.01 or press and
hold
to access quick setting. The maximum value
is 1.00.
Press
to decrease the value by 0.0 or press and
hold
to access quick setting. The minimum value
is 0.10.
Table 3. Surface Emissivity
Measure Surface
METALS
Aluminum
Oxidized
Alloy A3003
Oxidized
Roughened
Brass
Burnished
Oxidized
Copper
Oxidized
Electrical Terminal Blocks
Haynes
Alloy
Inconel
Oxidized
Sandblasted
Electoropolished
Switch Setting
0.2-0.4
0.3
0.1-0.3
0.3
0.5
0.4-0.8
0.6
0.3-0.8
0.7-0.95
0.3-0.6
0.15
Iron Cast
Oxidized
Unoxidized
Molten
Iron Wrought
Dull
Lead
Rough
Oxidized
Molydbenum
Oxidized
Nickel
Oxidized
Platinum
Black
Steel
Cold-Rolled
0.6-0.95
0.2
0.2-0.3
0.9
0.4
0.2-0.6
0.2-0.6
0.2-0.5
0.9
0.7-0.9
Iron
Oxidized
Rusted
NON-METALS
Asbestos
Asphalt
Basalt
Carbon
Unoxidized
Graphite
Carborundum
Ceramic
Clay
Concrete
Cloth
0.5-0.9
0.5-0.7
0.95
0.95
0.7
0.8-0.9
0.7-0.8
0.9
0.95
0.95
0.95
0.95
Ground Sheet
Polished Sheet
Zinc
Oxidized
Glass
Plate
Gravel
Gypsum
Ice
Limestone
Paper (any colour)
0.4-0.6
0.1
0.1
0.85
0.95
0.8-0.95
0.98
0.98
0.95
