Measurement Display
While pressing MEASURE key, aim the laser beam at an object being
tested. MEAS is shown on the display to indicate that the instrument is in
measuring mode. Release MEASURE key to stop measurement. The
display reading is automatically frozen, with HOLD shown on the display.
To display maximum or minimum reading;
In the HOLD mode, press MODE key to display the maximum reading.
MAX is shown on the display. Press MODE key again to display the
minimum reading. MIN is shown on the display.
To display only the maximum or minimum reading during measurement;
With MAX or MIN shown on the display, press MEASURE key. Updated
maximum or minimum reading is shown on the display.
If no key is pressed for 30 seconds after the reading is frozen, the
instrument automatically turns itself off. Pressing MEASURE key to turn
on the instrument cancels stored maximum or minimum reading. When the
batteries wear out, stored maximum or minimum reading is canceled as
well.
Battery
(1) Installing Batteries
Press the battery compartment cover on its top and bottom as shown
below to remove it. Install batteries in correct polarity as shown inside
the battery compartment.
(2) Replacing Batteries
Replace the batteries when the
low battery symbol appears on the
display or the display blinks.
Note Always replace both batteries.
Settings
(1) Emissivity
Emissivity of an object being tested can be selected from DARK (0.95),
BRIGHT (0.8) or FREE (variable from 0.3 to 1.90).
When the instrument is turned on, emissivity is set to DARK. A bar
appears under DARK, BRIGHT or FREE on the display to indicate which
one is selected. Press ▲ key to change selection. When FREE is
selected, emissivity is set to 1.00. To change this value;
① Press MEASURE key to turn on the instrument.
② While pressing ENT key, push MODE key. ALARM is shown on the
display.
③ Press MODE key. 1.00 or the value set previously is shown on the
display, with the least significant digit blinking.
Press ▲ or ▼ key to change the blinking
number and press ENT key. Repeat the same step
on the other digits.
④ Press MODE key to switch the instrument to measuring mode.
(2) Alarm
If readings exceed a certain value, the beeper sounds and ALARM blinks
on the display. To set the alarm value;
① Press MEASURE key to turn on the instrument.
② While pressing ENT key, push MODE key.
699 or the value set previously is shown on the
display, with the least significant digit blinking.
③ Press ▲ and ▼ key to change the blinking
number and press ENT key. Repeat the same step on
the other digits.
To set 2-digit value, display
“
0
”
on the most significant digit.
To set a negative value, display
”
－
”
on the most significant digit.
④ Press MODE key to switch the instrument to measuring mode.
Emissivity
DARK :0.95
BRIGHT:0.80
FREE :0.3 to 1.90 variable
Displays temperature
readings, emissivity
value or alarm value
MEAS：Displayed during measurement
HOLD：Displayed during hold mode
Low Battery Symbol
Blinks when batteries wear
out
MAX ： Displayed when the
maximum reading is
shown
MIN ： Displayed when the
minimum reading is
shown
ALARM: : Displayed during
alarm setting and blinks
during alarm
Displayed when temperature
readings are shown
Displayed when emissivity
value is shown
■Setting Emissivity (reference)
The table below shows emissivity for some materials. Please note that these values
are just for reference and only apply to IRT-100-TA. Infrared radiation depends on
materials, condition of the surface and ambient temperature.
Material
Emissivity
Material
Emissivity
Water, Ice
0.98
Cloth, Fabric
(colored)
0.95
Soil
0.92 to 0.96
Leather, Fur
0.96
Concrete (wet)
0.96 to 0.98
Human skin
0.99
Concrete (dry)
0.91 to 0.95
Vegetable, Fruit
0.98
Ceramic
0.85 to 0.95
Dough
0.98
Plaster, asbestos
0.92
Meat
0.98
Plastic
0.90 to 0.95
Copper oxide
0.5 to 0.6
Rubber (black)
0.95
Ferro-oxide
0.7 to 0.8
Wood
0.98
Painted surface
0.8
Paper
0.92
Tile
0.8
Estimating emissivity using the Black Body Tape
Place a piece of the black body tape (emissivity: 0.94) on an object. Set emissivity to
0.94 in FREE mode and measure the temperature of the object. Then remove the tape
from the object. Measure its temperature again and adjust emissivity value so that
readings match the temperature measured with the black body tape attached on the
object. The adjusted value is the emissivity of the object. The black body tape is
available as an option.
Measure Key
Measurements are taken while
this key is pressed. Releasing
this key freezes the last
reading and automatically turns
the instrument off in 30
seconds, if no key is pressed.
Mode Key
Display the current, the
maximum or the minimum
reading, and selects setting
mode.
Up Key
Selects DARK, BRIGHT or
FREE, and sets emissivity and
alarm value.
Down Key
Sets emissivity and alarm
value.
Entry Key
Registers set values and
switches
the
instrument
setting mode.
Brightness Sensor
Automatically lights up the display
back-light when it becomes dim.
Display
