413
Safety Warnings and IEC Symbols
This device is marked with international safety and hazard sym-
bolsinaccordancewithIEC1010.Itisimportanttoreadandfollow
allprecautionsand instructions in this manual before operating or
commissioning this device as it contains important information
relatingtosafety and EMC. Failure to follow all safety precautions
may result in injury and or damage to your equipment. Use of this
device in a manner not specified by the manufacturer may impair
protection provided within the unit.
IEC symbols Description
Caution-Risk of Electric shock
Caution-Refer to Accompanying documents
Direct Current
Alternating Current
Earth (Ground) Terminal
Equipment protected throughout by Double
Insulation
Laser Symbol
OPERATION
Before taking any measurements, read the Safety Information
Section. Always examine the instrument for damage, contamina-
tion (excessive dirt, grease, etc.) and defects. Examine the test
leads for cracked or frayed insulation. If any abnormal conditions
exist do not attempt to make any measurements. For normal
operationwhenchangingrangesthroughOFFrange,pleasewait
for one second.
FUNCTIONS OF BUTTONS
Button
When the unit is turned on, the Auto Power-On (APO) mode is
disabled meaning that the meter shuts itself off after about 30
minutes of continuous operation. This feature saves battery life if
the meter is un-attended.
Pressing the button, enables the APO mode, and an APO
icon appears on the display meaning that the meter will not shut
itself off unless it is turned off by the user. This feature is also
desirable when the meter is used to monitor a parameter for an
extendedperiodoftime.UsingtheDCadapter,itwilltakeoverthe
battery power to save battery life. Pressing the button again
will disable the APO mode.
Button (Double Duty)
Pressing this button will toggle between AC and DC current
measurement. In infrared temperature measurement "IR" mode,
pressing this button decreases the Emissivity value of the target.
How to specify the target emissivity
In order to determine an unknown target Emissivity:
1. Set the Function switch to T/C.
2. Plug in a K type surface thermocouple probe to the meter.
3. Measure the target temperature using the surface probe.
4. Unplug the surface probe from the meter.
5. Set the Function switch to IR.
6. Aim at the target. Press & hold the button to turn on the
laser beam for positioning.
7. Adjust the Emissivity button until the meter reads the same
temperature measured via the thermocouple probe. Read the
new Emissivity setting.
Measurement Considerations
1.Theory of Measurement
Every object emits infrared energy in accordance with its
temperature.Bymeasuringtheamount of this radiantenergy,it
is possible to determine the temperature of the emitting object.
2.About Infrared
Infrared radiation is a form of light (electromagnetic radiation),
and has the property that it passes easily through air while it is
easilyabsorbedbysolidmatter.Withanemissionthermometer
which operates by detecting infrared radiation accurate mea-
surement is possible, irrespective of the air temperature or the
measurement distance.
3.Emission Thermometer Structure
Infrared radiation which has been emitted from the object is
focused upon an infrared radiation sensor, via an optical sys-
tem. This includes a lens which is transparent to infrared
radiation, and 5.3µm cut off filter. The output signal from the
infrared radiation sensor is input to an electronic circuit along
with the output signal from a standard temperature sensor
(Thermopile).
4.Emissivity
Allobjects emit invisible infrared energy. Theamountof energy
emittedisproportionaltotheobject'stemperatureand its ability
to emit IR energy. This ability, called emissivity, is based upon
the material that the object is made of and its surface finish.
Emissivity values range from 0.10 for a very reflective object to
1.00forablackbody.Factorysetemissivityvalueof0.95,which
cover 90% of typical applications.
5.If the surface to be measured is covered by frost or other
material, clean it to expose the surface.
6.Ifthesurfacetobe measured ishighlyreflective,applymasking
tape or matt finish black paint to the surface.
7.Ifthemeterseemstobegivingincorrectreadingscheckthefront
lens.Theremaybecondensationordebrisobstructingthelens;
clean per instructions in the maintenance section.
Substance Thermal Substance Thermal
emissivity emissivity
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Lather 0.75 to 0.80
Sand 0.90 Charcoal (powder) 0.96
Earth 0.92 to 0.96 Lacquer 0.80 to 0.95
Water 0.92 to 0.96 Lacquer (matt) 0.97
Ice 0.96 to 0.98 Rubber (black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90 to 0.95 Timber 0.90
Ceramic 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94 chromium oxides 0.81
Plaster 0.80 to 0.90 Copper oxides 0.78
Mortar 0.89 to 0.91 lron oxides 0.78 to 0.82
Brick (red) 0.93 to 0.96 Textiles 0.90
