Nova-Tech 4477 TRACEABLE INFRARED THERMOMETER KeyChaIn_lanyard - Manual

SpecificationS
Range: –4 to 572°F
Resolution: 0.1
accuracy:
Below 392°f ±4°F or ±2% (the larger
amount applies
above 392°f ±4% to + 2°C
field of View: 6:1
ambient temperature range: 32 to 104°F
emission factor (emissivity): 0.95
power supply: 4 x L1154 button cell
batteries
Battery Life: 2000 measurements
(depending on the usage)
Dimensions:
(L” x W” x H”) 2¼ x 1 x 4 inches
GeneRaL
Press and hold the operating button for more than 1.5
seconds. The temperature of the surface the lens is aimed
at will read on the top of the display. The minimum and
maximum temperatures of the current measurement are
shown on the bottom of the display. When the operating
button is released “HOLD” will be displayed between “min”
and “max” indicating the measurement is completed. After
4 seconds the backlight will turn off. The unit will switch off
after 6 seconds. Press and hold the operating button again
to begin a new measurement. To switch between °F and
°C simply double click the operating button.
DeScRiption of meaSuRinG pRincipLe
When making a temperature measurement the surface ra-
diation of the object to be measured is evaluated using the
principle of radiation thermometry. This is a purely passive
process, i.e. no radiation is transmitted, but instead, use is
only made of the natural electromagnetic radiation energy
(heat radiation) that every body above a temperature of
absolute zero (–273°C) has. The temperature can be
determined very accurately from this radiation energy if the
emission factor of the object being measured is known.
opeRation
i. Display and operator controls
All of the functions of the the measuring unit are controlled
and monitored using the operating button and the back lit
display.
a. Temperature display –currently measured value
b. Hold indicator
c. Temperature display – minimum value
d. Temperature display – maximum value
e. Battery symbol – low battery indicator
f. Temperature units – °F or °C
g. Operating Button
h. Lens
ii. makinG a meaSuRement
The object being measured should be a minimum of twice
the size of the infrared thermometer’s measuring lens.
The ideal measuring distance is 3 to 12 inches, which will
yield a measurement area of 0.2 inch 2 to 3.2 inch 2 . As the
infrared thermometer is moved away from the object being
measured the area being measured increases (6:1 ratio).
The infrared thermometer is switched on by holding
the operating button down for 1.5 seconds or more.
By continuously holding down the operating button the
measured value will be updated as long as the operating
button is pressed. Releasing the operating button will fin-
ish the measurement. The “HOLD” indication signals that
measuring has stopped. The backlight will shut off 4 sec-
onds after the operating button is released. The infrared
thermometer will automatically switch off 8 seconds after
the last measurement. Holding down the operating button
again will clear the minimum and maximum memory and
begin a new measurement.
iii. minimum anD maximum
tempeRatuRe inDication
The minimum and maximum value memories are cleared
at the start of measurement by pressing the operat-
ing button. The temperature will be measured and the
minimum and maximum temperatures will be determined
for as long as the button is pressed. The minimum
temperature is shown in the lower left-hand part of the
display and the maximum temperature can be seen in the
lower right-hand part of the display. These values each
apply to the current measuring cycle and are cleared as
soon as the button is pressed again.
iV. cHanGinG tHe tempeRatuRe unitS (°f/°c)
The units for the temperature display can be switched
between degrees Celsius (°C) and degrees (°F) by
pressing the button briefly twice (double click).
V. Back LiGHt
The LCD back light is constantly switched ON while the
operating button is released, the back light will be ON for
approximately 4 seconds before automatically switching
off 8 seconds after the last measurement.
Vi. meaSuRement inaccuRacieS
The following points should be observed in order to avoid
measurement errors:
a. It must be ensured that the object to be measured
completely fills the infrared thermometer monitoring
area. Errors can occur when measuring small objects,
as the unit also monitors the temperature of the sur-
roundings as well as the object to be measured.
b. The principle of measurement requires the ambient
temperature to be determined. This takes place at
one-minute intervals or each time the unit is switched
on. Changes in the ambient temperature, which can
occur when the user holds the unit in their hand, are
not monitored within the time period and therefore
taken into account when determining the indicated
temperature. A gradual warming of the unit (the lens)
between ambient temperature measurements can,
for example, lead to the indicated temperature slowly
falling.
c. If the emission factor for the object does not cor-
respond to the preset value of 0.95, the temperature
will not be calculated correctly. Most surfaces have an
emission factor in the range of 0.8 to 0.98. In general,
the darker and more matte the surface is, the larger
their emissions factor. If the factor is greater than 0.95,
the temperature indicated will be greater than the ac-
tual temperature of the object being measured. If the
factor is less than 0.95, the temperature indicated will
be less than the surface temperature. Polished metals
have a very low emission factor and are therefore not
suitable for measuring with an infrared thermometer.
On the other hand, affixing adhesive tape to or paint-
ing the surface will increase the emission factor and
reduce the inaccuracy of the measurement.
d. It is not possible to take measurements through
transparent materials (glass, plexiglas, etc.).
e. It is not possible to measure air temperatures.
f. Measurement errors can occur due to air
contaminated with dust, steam, smoke, etc.
Vii. tRouBLeSHootinG
problem: Display shows -.-.
Solution: The operating button has not been pressed
long enough. The operating button must
be pressed for at least the duration of one
measurement, i.e. for at least 1.5 seconds.
problem: Display shows Err1
Solution: The ambient temperature is outside the
permitted range
problem: Display shows 1
Solution: The measured value is outside the permitted
range.
problem: Battery symbol illuminates
Solution: The batteries are dead.
maintenance
i. cHanGinG tHe BatteRieS
If the battery symbol appears in the display, the batteries
must be changed. The four button cells are accessible
after opening the battery holders and replaced by new
button cells of the same type. Only L1154 type batteries
may be used. Care must be taken to ensure that the
polarity is correct when inserting. The plus terminal of all
four batteries should point upwards. The batteries must
be checked to see that they are properly sealed before
closing the battery compartment.
ii. cLeaninG
Clean the unit using only a dry cloth. If the unit is very
dirty, the cloth may be slightly dampened. Do not use the
cleaners containing solvents. Make sure that no moisture
enters the interior of the unit. When cleaning the lens,
loose particles must be removed using compressed air.
Any remaining dirt can then be removed with a soft brush
or with a cotton swab moistened with water.
caution Do not use cleaners containing solvents.
faSteninG tHe infRaReD tHeRmometeR
A soft-sided pouch with a belt loop and a quick release
neck strap are included with the infrared thermometer. To
attach the infrared thermometer to the neck strap simply
insert the clip of the neck strap into the buckle end of the
thermometer until it clicks. To release, press both sides
of the clip on the neck strap and pull the buckle end until
it is free.
tecHnicaL infoRmation
1. accuracy: The larger of the two values given is ap-
plicable in each case.
2. Distance to measuring spot size (field of View):
The parameter D:S characterizes the size of the mea-
suring spot in proportion to the distance between the
object to be measured and the Infrared Thermometer.
For example, with a radio of 6:1 and a distance of 12
inches, the monitoring area will have a diameter of
12 inches.
3. emissions factor (emissivity): The physical quantity
known as the emission factor describes to what
extent the infrared heat radiation that is emitted from
an object is determined by its own temperature.
Accordingly, a value of 1 tells us that the infrared heat
radiation from the object is based only on its own
temperature. A value of less than 1 means that the ra-
diation emitted from the object is not only determined
by its own temperature but also by reflections from
neighboring bodies or due to the transmission, i.e.
the diathermancy, of the object. The emission factor
thus has an effect on the result of the measurement.
The Infrared Thermometer works with an emission
factor of 0.95, i.e. the measuring unit assumes that
the object being monitored has a factor of 0.95. If
this is not the case, there will be inaccuracies in the
measurement (see Measurement Inaccuracies).