3.6 Using the Temperature HiTester
with a Personal Computer
15
16
18
21
22
Chapter 4 Specification 23
Chapter 5 Maintenance and Service
5.1 Troubleshooting 27
5.2 Questions and Answers
about Measurement
25
28
i
ii
iv
v
1
3
Page 42
Page 43
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Introduction
Thank you for purchasing this Hioki "3444/3445
Temperature HiTester." To get the maximum
performance from the instrument, please read this
manual first, and keep this at hand.
i
――――――――――――――――――――――――
Introduction
Page 44
ii
―――――――――――――――――――――――――――
Safety Notes
WARNING
Incorrect measurement procedures could result in
injury or death, as well as damage to the
equipment. Please read this manual carefully and
be sure that you understand its contents before
using the equipment. The manufacturer disclaims
all responsibility for any accident or injury except
that resulting due to defect in its instrument.
This Instruction Manual provides information and
warnings essential for operating this equipment in a
safe manner and for maintaining it in safe operating
condition. Before using this equipment, be sure to
carefully read the following safety notes.
Safety symbols
In the manual, this mark indicates
explanations which it is particularly
important that the user read before using
the instrument.
Indicates warnings relating to the laser.
――――――――――――――――――――――――
Safety Notes
Page 45
―――――――――――――――――――――――――――
iii
The following symbols are used in this Instruction
Manual to indicate the relative importance of
cautions and warnings.
Indicates that incorrect operation
DANGER
presents extreme danger of accident
resulting in death or serious injury to
the user.
Indicates that incorrect operation
WARNING
presents significant danger of accident
resulting in death or serious injury to
the user.
Indicates that incorrect operation
CAUTION
presents possibility of injury to the user
or damage to the equipment.
Denotes items of advice related to
NOTE
performance of the equipment or to its
correct operation.
Accuracy
・
rdg. (displayed or indicated value)
This signifies the value actually being measured,
i.e., the value that is currently indicated or displayed
by the measuring instrument.
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Safety Notes
Page 46
iv
―――――――――――――――――――――――――――
Check before use
・
Before using the instrument, inspect it and check
the operation to make sure that the instrument was
not damaged due to poor storage or transport
conditions. If damage is found, contact your dealer
or Hioki representative.
Inspection
When you receive this instrument, before use, please
check that no abnormality or damage has occurred
during delivery. In particular, be sure to check the
accessories, the liquid crystal display, the control
keys, and the lens.
In the unlikely event of damage, or if the instrument
does not function according to specification, you
should immediately contact the dealer from whom
you bought the instrument, or the nearest Hioki
service facility.
――――――――――――――――――――――――
Inspection
Page 47
―――――――――――――――――――――――――――
Notes on Use
In order to ensure safe operation and to obtain
maximum performance from the instrument, observe
the cautions listed below.
DANGER
Operation of this instrument according to any
・
procedure not specified in this manual may
cause explosion due to dangerous laser
radiation.
The 3444/3445 (Laboratory type instrument) uses
・
as a light source a semiconducting laser which
emits visible light, and which conforms to JIS
standard class 2 (JIS C6802). (Wavelength
670nm, maximum power output 1 mW)
Since there is considerable danger of this laser
light causing damage to the eyes, be very
careful not to direct this laser light into your
eyes or those of another person.
Do not look directly into the laser light from the
・
optical system.
When measuring the temperature of an object
・
which has a mirror finish, be careful not to allow
the laser light beam to be reflected off the
surface into your eyes or those of another
person.
Do not allow the laser light beam to impinge
・
upon any gas which can explode.
v
――――――――――――――――――――――――
Notes on Use
Page 48
vi
―――――――――――――――――――――――――――
WARNING
To prevent electric shock, do not allow the
・
instrument to become wet and do not use the
instrument when your hands are wet.
Ensure that protective functions are fail-safe:
・
that is to say, that if they fail they either prevent
the instrument from operating or give an
indication to prevent unwitting operation.
CAUTION
Do not use the instrument near any device which
・
generates strong electromagnetic radiation or near
a static electrical charge, as these may cause
errors.
The instrument should always be operated indoors
・
in a range from 0
to 40and 35% to 85% RH or
less. Do not use the instrument in direct sunlight,
dusty conditions, or in the presence of corrosive
gases.
Do not store or use the instrument where it will be
・
exposed to direct sunlight, high temperatures, high
humidity, or condensation. If exposed to such
conditions, the instrument may be damaged, the
insulation may deteriorate, and the instrument may
no longer satisfy its specifications.
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Notes on Use
Page 49
―――――――――――――――――――――――――――
CAUTION
This instrument has been constructed with some
・
vii
degree of water resistance, but if it is subjected to
direct contact with water for a long period of time,
water may get into the instrument. Further, water
drops left on the lens will cause measurement
errors. Wipe off any water drops promptly.
Do not use the instrument where it may be exposed
・
to corrosive or explosive gases. The instrument
may be damaged, or explosion may occur.
To avoid damage to the instrument, do not subject
・
the equipment to vibrations or shocks during
transport or handling. Be especially careful to avoid
dropping the equipment.
Do not point the lens at the sun or at any other
・
source of strong light. If you do, the sensor may be
damaged.
Do not contact the lens against the object whose
・
temperature is to be measured, or get it dirty, allow
it to be scratched, or allow any foreign material to
adhere to it. Doing so may cause errors.
・ Before use, verify that no damage has occurred due
NOTE
to careless storage or transport, and check the
appearance and operation of the instrument.
・ The
indicator flashes when the remaining
battery capacity is low. In this case, the instrument's
reliability is not guaranteed. Replace the battery
immediately.
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Notes on Use
Page 50
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――――――――――――――――――――――――
Notes on Use
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Chapter 1
Summary
1.1 Product Summary
1. Theory of Measurement
Every object emits infrared energy in accordance
with its temperature. By measuring the amount of
this radiant energy, 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 easily absorbed by solid
matter.
With an emission thermometer which operates by
detecting infrared radiation, accurate measurement is
possible, irrespective of the air temperature or the
measurement distance.
1
3. Emission Thermometer Structure
Infrared radiation which has been emitted from the
object is focused upon an infrared radiation sensor,
via an optical system which includes a lens which is
transparent to infrared radiation, an 8 μm cuton
filter, etc..
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Chapter 1 Summary
Page 52
2
―――――――――――――――――――――――――――
The output signal from the infrared radiation sensor
is input to an electronic circui t along with the
output signal from a standard temperature sensor.
The electronic circuit calculates the object
temperature while applying standard temperature
compensation, thermal emissivity compensation,
etc., and displays the result.
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Chapter 1 Summary
Page 53
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1.2 Names and Functions of Parts
3444/3445 laboratory type unit
(1)Lens
(2)Laser port
Screw hole for camera tripod
Laser specification (spec.)
and caution label
Battery box
3
Connector cover
(inside: connector
for interface pack)
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Chapter 1 Summary
Page 54
4
―――――――――――――――――――――――――――
・ Connect the cable provided with the optional 3909
NOTE
Interface Pack to the expansion box connector. For
details, please refer to the user instructions provided
with the 3909 Interface Pack.
Operating section
LCD display
(4)Parameter adjust
keys
(3)Mode select
key
(5)OFF key
(6)Displayed
resolution select
key
(5)Measure key
(1) Lens
Infrared rays from the object whose temperature is
to be measured are received here.
(2) Laser marker beam emission openings
The laser marker beams are emitted from here.
(3) Mode select key
This key displays the
MAX/MIN
-temperature or the
present high and low readings during measurement.
In addition, emissivity and analog voltage output
scale are also displayable when on
――――――――――――――――――――――――
Chapter 1 Summary
HOLD
.
Page 55
―――――――――――――――――――――――――――
・ To use the analog voltage output function, an
NOTE
optional interface pack is required.
(4) Parameter adjust keys
These keys raise/lower emissivity and analog voltage
output scale.
・
key: Decreases
・
key: Increases
If either of these Parameter adjust keys is held
down, the numerical value changes rapidly in the
appropriate direction.
(5) OFF key
Pressing this key turns OFF the power.
(6)
key
MEAS
Every time the
key is pressed, the
MEAS
thermometer toggles between the measurement or
hold functions.
There is no power switch.
Pressing the
key turns ON the power. The
MEAS
power cuts OFF 15 seconds after HOLD or SET is
displayed (automatic power OFF).
The automatic power OFF function does not work
during measurement. Select HOLD.Powercanalso
be turned off with the
key.
(7) Displayed resolution select key
Every time the
resolution, 1
key is pressed, the displayed
/
or 0.1 , is selected.
5
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Chapter 1 Summary
Page 56
6
―――――――――――――――――――――――――――
LCD display
HOLD indicator
Laser indicator
MEAS indicator
Battery indicator
Measured value
Emissivity
indicator
SET indicator
ZERO/FS indicator
LCD display
・
indicator : Displayed when the measured
HOLD
value is displayed.
・MEAS indicator : Displayed when measurement
is being carried out.
・Laser indicator : Displayed when laser is not
emitted.
Blinks when laser is being
emitted.
・ε indicator : Displayed when emissivity is being
set and displayed.
・
indicator : Blinks when emissivity and
SET
analog voltage output scale are
being set.
・
ZERO/FS
ZERO
indicator
: Displayed when lower limit of analog
voltage output scale is being set.
F.S. : Displayed when upper limit of analog
voltage output scale is being set.
indicator
MAX/MIN
indicator
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Chapter 1 Summary
Page 57
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・ To use the analog voltage output function, an
NOTE
optional interface pack is required.
・MAX/MIN indicator
MAX : max. temp. display
: min. temp. display
MIN
・indicator : Unit of centigrade.
・
indicator : Theindicator flashes
when the remaining battery
capacity is low. In this case, the
instrument's reliability is not
guaranteed. Replace the battery
immediately.
・Measured value : The entire display blinks when
the measurement value falls
outside the measurement range
(-50.0 to 500.0
).
7
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Chapter 1 Summary
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8
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Chapter 1 Summary
Page 59
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Chapter 2
Prior to Use
Prior to operating the thermometer, carry out the
following:
1. Attaching the accessory screwdriver
Attach the accessory
screwdriver to the hand strap
so that it will not get lost.
This screwdriver is used to
remove the battery cover screws.
Attaching the screwdriver
2. Attaching the hand strap
Attach the hand strap to the
instrument to help prevent its
being dropped.
3. Loading the battery
Place the battery correctly in
the battery box at the back of
main body.
For loading the battery, refer to "2.1 Battery
Loading and Replacement".
9
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Chapter 2 Prior to Use
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10
―――――――――――――――――――――――――――
2.1 Battery Loading and Replacement
・ The thermometer does not come with the battery
loaded. Load the battery according to the procedure
described below.
・ The
battery capacity is low. In this case, the instrument's
reliability is not guaranteed. Replace the battery
immediately.
・ If the main body is wet, be sure to wipe off the
water, set the battery box facing downward so that
any water in the joint will not enter the case, and
then remove the battery cover.
Dry battery used : Manganese battery 6F22 or alkali
1. Remove the battery cover.
Loosen the screws of
the battery cover at the
back of the main body
with the accessory
screwdriver and
remove the battery
cover.
2. Replace the battery.
Remove the old
battery.
Check the polarity (+ or -) of the new battery, and
load it correctly.
3. Close the battery cover.
After the battery is loaded, close the battery cover,
and tighten the screws evenly and firmly.
――――――――――――――――――――――――
Chapter 2 Prior to Use
indicator flashes when the remaining
battery 6LR61
rubber gasket
Page 61
―――――――――――――――――――――――――――
DANGER
11
When changing the battery, be careful not to
press the
MEAS
key by mistake.
It is very dangerous to allow the laser beam to
shine into your eyes or those of another person.
Also, after changing the battery, be sure to close
the cover before using the unit.
WARNING
When changing the battery, be sure to fit the
・
battery the proper way around (i.e. with the
correct polarity).
Do not short circuit the old exhausted battery or
・
throw them into a fire; they might explode.
Dispose of the old exhausted battery in an
・
approved waste disposal facility.
CAUTION
Take care not to get the wire caught in the battery
・
cover.
Do not close the battery cover if the rubber gasket
・
is dirty or twisted. Otherwise, the water-resistance
of the instruments main body will not be maintained.
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Chapter 2 Prior to Use
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12
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・ When the battery is removed, various set values are
NOTE
lost. When replacing the battery, set the emissivity
and analog voltage output scale. (Refer to "3.3
Setting Emissivity (ε)". To use the analog voltage
output function, an optional interface pack is
required. Refer to the instruction manual for more
information about this interface pack.)
・ When not in use for a long time, to prevent possible
corrosion caused by battery leakage, remove the
battery before storage.
・ The battery included with 3444/3445 have a short
time.
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Chapter 2 Prior to Use
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13
Chapter 3
Making
Measurements
3.1 Start and Complete Measurement
1. When the power is off,
pressing the
turns on the power.
The values and settings on
the LCD display return to
the state before the power
was last turned off.
MEAS
key
・ If, from the power off condition, the
NOTE
――――――――――――――――――――――――
held down for more than one second, measurement
starts.
2. Point the lens at the object whose temperature is to
be measured.
3. Press the
Measurement is performed as long as the
is kept pressed. While the
pressed, the laser sighting beam is emitted so you
can aim it at the object.
Releasing the
even measurement is continued.
MEAS
key.
key is being
MEAS
key turns off the laser indicator
MEAS
Chapter 3 Making Measurements
MEAS
key is
MEAS
key
Page 64
14
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DANGER
With the 3444/3445, whenever the indicationis
flashing, the laser marker beam is being emitted.
Exercise extreme care not to allow the laser
marker beam to enter your eyes (because of this
laser light causing damage to the eyes) or those
of another person.
4. Read the display.
5. Complete measurement.
When the
MEAS
key is
pressed again during
measurement,
measurement is completed,
and the measured value is
saved (HOLD).
・ When the measurement value is out of the
NOTE
measurement temperature range (-50.0 to 500.0
),
the display will flash.
6. Turn OFF power.
Pressing the
key turns
OFF the power.
While
HOLD
is lit, the
automatic power OFF
function works after
approx. 15 seconds to turn
OFF the power.
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Chapter 3 Making Measurements
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15
3.2 Target Size and Sighting
・ Although the field of measurement and the sighting
NOTE
3444
almost coincide, actually the field of measurement
corresponds to the diameter for 90% optical
response. The object whose temperature is to be
measured needs to be larger than the measurement
diameter by an adequate margin‐at least 1.5 to 2
times larger.
・ The sighting beam must encompass the area to be
measured up to the max. measurement distance of
1.5 meters.
・ Even if the measurement distance is greater than 2
meters, temperature is displayed as a mean value of
the target size if there is no substance to absorb or
interrupt the infrared ray from the object being
measured.
Sighting pitch
Distance
Target size
distance0.5 m1m1.5 m2m
20 mm
Target size
Sighting
pitch
φ
34 mm41 mm48 mm55 mm
――――――――――――――――――――――――
24 mm
φ
Chapter 3 Making Measurements
48mm
φ
80 mm
φ
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16
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3445
Sighting pitch
Distance
distance73 mm100 mm150 mm200 mm
2.0
Target size
Sighting
pitch
φ
0mm10 mm28 mm47 mm
1mm
Target size
8mm
φ
20 mm
φ
3.3 Setting Emissivity (ε)
Each substance has particular emissivity. Precise
measurement requires appropriate setting.
1. Displaying emissivity (ε)
Press the M key several
times in the HOLD state
to display emissivity.
ε will light and
blink.
2. Setting emissivity (ε)
Numerals can be changed
with the
SET
key.
will
33 mm
φ
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Chapter 3 Making Measurements
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17
3. Completing setting of
emissivity (ε)
Press the
MEAS
key to
complete the setting.
Measurement can be
started immediately.
Substance Thermal
emissivity
Asphalt0.90 to 0.98Charcoal
Concrete0.94Lacquer0.80 to 0.95
Cement0.96Lacquer (matt) 0.97
Sand0.90Rubber (black) 0.94
Earth0.92 to 0.96Plastic0.85
Water0.92 to 0.96Timber0.90
Ice0.96 to 0.98Paper0.70 to 0.94
Snow0.83Aluminium
Glass0.90 to 0.95Chromium
Ceramic0.90 to 0.94Copper oxides 0.78
Marble0.94Iron oxides0.78 to 0.82
Fluorite0.30 to 0.40Nickel oxides 0.90
Plaster0.80 to 0.90Titanium
Mortar0.89 to 0.91Zinc oxides0.11 to 0.28
Brick (red)0.93 to 0.96Brass oxides0.56 to 0.64
Textiles0.90Uneven
Cloth (black)0.98Rolled
Human skin0.98Heavily rusted
Leather0.75 to 0.80
――――――――――――――――――――――――
Substance Thermal
emissivity
(powder)
oxides
oxides
oxides
bronze
surfaces
stainless steel
iron
Chapter 3 Making Measurements
0.96
0.76
0.81
0.40 to 0.60
0.55
0.45
0.69
Page 68
18
―――――――――――――――――――――――――――
・ Variations in the surface condition and color of the
NOTE
object whose temperature is to be measured may
cause the thermal emissivity ε to be somewhat
different from the values in the above table. If an
accurate temperature measurement is desired for an
object whose thermal emissivity is not known, black
body tape (sold separately) should be used. In this
case the setting for thermal emissivity (ε) should be
the value indicated on black body tape.
3.4 Simple Method to Determine ε
If the setting of emissivity is changed, the
thermometer recalculates the emissivity according to
the emissivity after the HOLD value is set.
Using either black-body tape or black-body spray
makes it easy to determine the emissivity of the
object to be measured. Black-body tape and blackbody spray are available from Hioki as extra-cost
options.
1. Cover the object to be measured with black-body
tape (or spray), and heat it to the appropriate
temperature, i.e., room temperature +20
Keep the temperature as constant as possible.
(The emissivity can be determined most accurately
when the temperature of the object is high.)
or more.
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Chapter 3 Making Measurements
Page 69
―――――――――――――――――――――――――――
19
2. Set the 3444/3445 value
of ε to the emissivity of
the black-body tape.
3. Measure the temperature
of the portion covered by
the black-body tape with
this unit and record this
value. (This is used in
step 6.)
4. Then measure a portion
not covered by the blackbody tape that is as close
as possible to the portion
measured in the previous
step 3. Release the
MEAS
key to hold the measured
value.
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Chapter 3 Making Measurements
Page 70
20
―――――――――――――――――――――――――――
5. Press theMkey several
times to select the
emissivity setting screen.
6. Press the
or thekey
to change the ε value until
the temperature becomes
the value obtained in (3).
The ε value at this time is
emissivity of the object to
be measured.
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Chapter 3 Making Measurements
Page 71
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21
3.5 Displaying MAX (MIN) Temperature
1. Displaying MAX/MIN temperature
Pressing the
displays the maximum
(minimum) temperature in
the order of
MIN.
In HOLD mode, the MAX
(
) temp. of the
MIN
previous measurement is
displayed.
In
MEAS
displayed.
key
M
→
MAX
mode, the present
MAX(MIN
)temp.is
2. Releasing
Press the
MAX/MIN
key several
M
display
times until no setting is
displayed.
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Chapter 3 Making Measurements
Page 72
22
―――――――――――――――――――――――――――
3.6 Using the Temperature HiTester
with a Personal Computer
Using the optional 3909 Interface Pack, you can
transfer measurements stored in the 3444/3445
memory to a personal computer for processing.
The 3909 Interface Pack consists of a modular
cable, an expansion box, and the TEMP software
utility for loading data into the PC.
1. Using the 3909 modular cable, expansion box,
and an RS-232C null-modem cable (not
included), connect the 3444/3445 to the serial
port on your personal computer.
2. Start up the 3909 TEMP utility (data import
software).
The TEMP utility makes it easy to transfer data and
manage it on your personal computer.
Data can also be imported into for processing Excel.
Excel is a registered trademark of Microsoft
Corporation.
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Chapter 3 Making Measurements
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23
Chapter 4
Specification
Product type3444/3445 Temp er a t u re Hi Te st er
Detector / optical lens t her mop i le / silicon
Measurement
wavelength
Measurement
temperature range
Display resolution0.1 /1
Guaranteed accuracy
period
Accuracy of
measurement
200.1 to 500.0
0.0 to 200.0
-50.0 to -0.1
RepeatabilityResolution : 0.1
Response timeResolution : 0.1
Target size3444
Sighting2-beamlasermarker(class2)
(Laboratory Type)
8to16μm
-50.0 to 500.0(-58 to 932 )
1year
(except w he n b a t t er y mar k is
blinking)
1% rdg .
2
10%rdg.2
ε=1.0, temperature of case 23
ambient humidity 55 %RH
0.5(0.0 to 500.0 )
1(-50.0 to -0.1 )
Resolution : 1
1(0 to 500 )
2(-50 to -1 )
Max. 1.6 s (95% resp onse)
Resolution : 1
Max. 0.7 s (95% resp onse)
24 3 mm/m (90% energy limit)
3445
1 mm/73 m m (90% energy
2.5
limit)
5 ,
――――――――――――――――――――――――
Chapter 4 Specification
Page 74
24
―――――――――――――――――――――――――――
Thermal emissivity
compensation
Auto power offap prox. 15 sec. (HOLD an d SET
Sampling rate1.25 times/second
Other functionsMAX/MIN values displayable.
Power sourceRa te d sup ply voltage 9 VDC x1
Maximum rated power 252mVA (max.)
Battery lifeApprox.20 hours under continuous
Ambient temperature
and humidity for use
Storage temperature-20 to 55(-4 t o 132 ); no
Location for useIndoor, altitude up to 2000 mm
Dimensions47 W x 200 H x 48 D m m (1.85" x
Analog voltage o ut p ut (0 to 1 V)
RS-232C in ter face : *1
6F22 man ganese battery x1
6LR61 alkalin e batt ery x1
operation at sighted lighting (alkali
battery)
0to40 (32 to 104 ),
35 to 85% RH; no c ond ensat ion
condensation
(6562-ft.)
7.87" x 1.89") appro x.
battery)
Hand Strap, 6F22 manganese
battery, screwdriver (for remove the
battery cover)
tape, AC Adapter (AC-10)
*1 : To use optional voltage output and RS-232C
interface, an optional interface pack is required.
*2 : IP54:No harmful influence when splashed from
any direction(based on IEC529 (1989))
――――――――――――――――――――――――
Chapter 4 Specification
Page 75
―――――――――――――――――――――――――――
25
Chapter 5
Maintenance and
Service
WARNING
If the protective functions of the unit are
damaged, either remove the unit from service or
post warnings to prevent others from using the
unit inadvertently.
――――――――――――――――――――――――
Chapter 5 Maintenance and Service
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26
―――――――――――――――――――――――――――
CAUTION
Gently wipe dirt from the surface of the unit with a
・
soft cloth moistened with a small amount of water
or mild detergent. Do not try to clean the unit using
cleaners containing organic solvents such as
benzine, alcohol, acetone, ether, ketones, thinners,
or gasoline. They may cause discoloration or
damage.
When not in use for a long time, to prevent possible
・
corrosion caused by battery leakage, remove the
battery before storage.
If the unit is not functioning properly, check the
・
battery, the probe. If a problem is found, contact
your dealer or Hioki representative. Pack the unit
carefully so that it will not be damaged during
transport, and write a detailed description of the
problem. Hioki cannot bear any responsibility for
damage that occurs during s hipment.
If the lens is dirty, clean dust etc. off it using a
・
camera lens cleaning tissue, blower or similar
means.
If the lens is very dirty, clean it using a cotton bud
・
containing a small quantity of alcohol.
――――――――――――――――――――――――
Chapter 5 Maintenance and Service
Page 77
―――――――――――――――――――――――――――
27
5.1 Troubleshooting
ProblemCauseSolution
No displayBatteries exhausted,
Measured
temperature
value peculiar
blinksOperating
The display
shows "Err"
――――――――――――――――――――――――
poorly contacting, or
wrongly inserted.
Lens dirtyClean the lens.
A heat source such
as a high
temperature body is
present close by.
The thermal
emissivity value is
not appropriate.
temperature range (0
) exceeded.
to 40
Err0: Detection
device
malfunction
Err1: Calibration
constant error
Err2: Measurement
circuit error
Err3: Software error
ErrH: Temperature
sensor error
(High
temperature)
ErrL: Temperature
sensor error
(Low
temperature)
Err-: Involatile
memory error
Errb: Backup error
Chapter 5 Maintenance and Service
Change the battery,
or insert them
correctly.
Intercept radiation
from the heat source
by using an
insulation plate etc.
Set the thermal
emissivity to an
appropriate value.
Use in operating
temperature range.
Change to new
batteries.
If the error message
still remains after the
batteries are
changed, there could
be a malfunction in
the device. Please
contact your
representative or the
nearest dealer.
Page 78
28
―――――――――――――――――――――――――――
Service
・
If the above shown solutions fail to solve the
problem, it is possible that your unit is
malfunctioning. Please contact your sales agent or
the manufacturer to arrange for repair.
5.2 Questions and Answers about
Measurement
Q: Why can't I measure the temperature on the other
side of a glass pane?
A: Normal glass absorbs infrared radiation of the
wavelength (8 to 16 μm) which this device uses for
temperature measurement. Therefore this device
cannot measure the temperature of an object on the
other side of a glass sheet, but instead measures the
temperature of the glass sheet itself.
Q: Light is shining on an object. Why can't I measure
its temperature accurately?
A: Since fluorescent light includes almost no infrared
radiation, it has almost no effect upon normal
temperature measurement. However sunlight and
incandescent lights emit radiation which includes
substantial amounts of the infrared radiation used by
this device for temperature measurement, and
accordingly may produce significant measurement
discrepancies.
――――――――――――――――――――――――
Chapter 5 Maintenance and Service
Page 79
―――――――――――――――――――――――――――
29
Q: Why can't I measure the temperature of a gas,
vapor, or flame?
A: Since gases, vapors, and flames are transparent to
infrared radiation, their temperatures cannot be
measured in this way.
Q: Why can't I measure temperature through rain or
fog?
A: Since rain and fog reflect and absorb infrared
radiation, accurate measurement through them is
impossible.
Q: Doesn't the measurement distance affect the
resulting measured value for temperature?
A: Air hardly absorbs at all infrared radiation of the
wavelengths (8 to 16 μm) used by this device for
temperature measurement. Therefore accurate
temperature measurement is possible, irrespective of
the measurement distance.
――――――――――――――――――――――――
Chapter 5 Maintenance and Service
Page 80
30
―――――――――――――――――――――――――――
――――――――――――――――――――――――
Chapter 5 Maintenance and Service
Page 81
Page 82
Page 83
HIOKI 3444/3445 TEMPERATURE HiTESTER
Instruction Manual
Publication date: September 2008 Revised edition 5
Edited and published by HIOKI E.E. CORPORATION
Technical Sales Support Section
All inquiries to International Sales and Marketing
Department
81 Koizumi, Ueda, Nagano, 386-1192, Japan
All reasonable care has been taken in the production of this
manual, but if you find any points which are unclear or in
error, please contact your supplier or the International Sales
and Marketing Department at HIOKI headquarters.
・
In the interests of product development, the contents of this
manual are subject to revision without prior notice.
・
The content of this manual is protected by copyright. No
reproduction, duplication or modification of the content is
permitted without the authorization of Hioki E.E.
Corporation.
Page 84
HEAD OFFICE
81 Koizumi, Ueda, Nagano 386-1192, Japan
TEL +81-268-28-0562 / FAX +81-268-28-0568
E-mail: os-com@hioki.co.jp/
URL http: //www.hioki.com/
HIOKI USA CORPORATION
6 Corporate Drive, Cranbury, NJ 08512, USA
TEL +1-609-409-9109 / FAX +1-609-409-9108
3444A980-05 08-09H
Printed on recycled paper
Page 85
Page 86
※お問い合わせは、最寄りの営業所または本社販売企画課まで。
3444A980-05 08-09H
この取扱説明書は再生紙を使用しています。
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