Hioki 3443-01 Instruction Manual

INSTRUCTION MANUAL

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3443-01

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TEMPERATURE HiTESTER

Contents

Introduction
Safety Notes
Inspection

iv

Notes on Use

Chapter 1 Summary

1.1 Product Summary 1

1.2 Names and Functions of Parts

Chapter 2 Prior to Use 9

2.1 Battery Loading and Replacement 10

2.2 Setting the Date and Time

12

Chapter 3 Making Measurements 15

3.1 Start and Complete Measurement 15

3.2 Target Size and Sighting

3.3 Setting Emissivity (ε)

3.4 Storing the Data

3.5 Switching between Fahrenheit and Celsius,
and Erasing All Data from Memory

3.6 Turning the Power Off

3.7 Using the Temperature HiTESTER

with a Personal Computer

17
18
20

22
23

23

i

ii

v

1

3

Chapter 4 Specification 25

Chapter 5 Maintenance and Service

5.1 Troubleshooting 31

5.2 Questions and Answers

about Measurement

29

32

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Introduction

Thank you for purchasing this HIOKI "3443-01
TEMPERATURE HiTESTER." To get the
maximum performance from the unit, please read
this manual first, and keep this at hand.

i

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Introduction

ii

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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 product.

This manual contains information and warnings
essential for safe operation of the product and for
maintaining it in safe operating condition. Before
using it, be sure to carefully read the following
safety precautions.

Safety symbols

In the manual, the symbol indicates
particularly important information that the
user should read before using the
product.

Indicates warnings relating to the laser.

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Safety Notes

―――――――――――――――――――――――――――

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
presents significant danger of accident

WAR NING

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

iv

―――――――――――――――――――――――――――

・Check before use

Before using the unit, inspect it and check the
operation to make sure that the unit 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 product, 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 unit does
not function according to specification, you should
immediately contact the dealer from whom you
bought the unit, or the nearest
facility.

HIOKI

service

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Inspection

―――――――――――――――――――――――――――

v

Notes on Use

In order to ensure safe operation and to obtain
maximum performance from the unit, observe the
cautions listed below.

DANGER

･Operation of this unit according to any

procedure not specified in this manual may
cause explosion due to dangerous laser
radiation.

･The 3443-01 (field type unit) 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.

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Notes on Use

vi

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WARNING

･To prevent electric shock, do not allow the unit

to become wet and do not use the unit when
your hands are wet.

･Ensure that protective functions are fail-safe:

that is to say, that if they fail they either prevent
the unit from operating or give an indication to
prevent unwitting operation.

CAUTION

･ Do not use the unit near any device which

generates strong electromagnetic radiation or near
a static electrical charge, as these may cause
errors.

･ The unit should always be operated indoors in a

range from 32

to 104 (0℃ to 40℃) and 35% to

85% RH or less. Do not use the unit in direct
sunlight, dusty conditions, or in the presence of
corrosive gases.

･ Do not store or use the unit where it will be

exposed to direct sunlight, high temperatures, high
humidity, or condensation. If exposed to such
conditions, the unit may be damaged, the insulation
may deteriorate, and the unit may no longer satisfy
its specifications.

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Notes on Use

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vii

CAUTION

･ This unit has been constructed with some 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 unit. Further, water drops left on
the lens will cause measurement errors. Wipe off
any water drops promptly.

･ Do not use the unit where it may be exposed to

corrosive or explosive gases. The unit may be
damaged, or explosion may occur.

･ To avoid damage to the unit, 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.

NOTE

･ Before use, verify that no damage has occurred due

to careless storage or transport, and check the
appearance and operation of the unit.

･ When the

mark on the display is flashing, the

battery are low. Fit new battery.

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Notes on Use

viii

―――――――――――――――――――――――――――

Warning Labels

Location of labels used in the HIOKI "3443-01
TEMPERATURE HiTESTER" are as follows.

Laser caution label

Laser specification
and caution label

Front

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Notes on Use

Rear

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1

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.

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 8μmcuton

filter, etc..

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Chapter 1 Summary

2

―――――――――――――――――――――――――――

The output signal from the infrared radiation sensor
is input to an electronic circuit 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

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3

1.2 Names and Functions of Parts

3443-01 field type unit

①

Lens

②

Laser port

Screw hole for camera tripod

Laser specification (spec.)
and caution label

Battery box

Connector cover
(inside: connector
for interface pack)

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Chapter 1 Summary

4

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NOTE

･ Connect the cable provided with the optional 3909

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

Mode select key

③

Time key

⑤

Clear key

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Chapter 1 Summary

⑦

Printer key

⑥

MEAS key

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5

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 Time key

Used to set the time and to check the time of stored
data.

④ Parameter adjust keys

Used to change the date, time, and emissivity, and
to increase/lower the memory data No.

・▼ key: Decreases
・▲ key: Increases

If either of these Parameter adjust keys is held
down, the numerical value changes rapidly in the
appropriate direction.

⑤ Clear key

Used to set the date and to clear displayed memory
data.

⑥

MEAS

Performs measurement while

key

MEAS

is being
pressed.
Measured value is held when the key is released.
There is no power switch.
Pressing the

MEAS

key turns ON the power. Power
is cut OFF in about 15 sec. if the key is not pressed,
except output to printer (automatic power OFF).

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Chapter 1 Summary

6

―――――――――――――――――――――――――――

Printer key

⑦

Pressing the

key outputs the stored data to an

P

external printer.

NOTE

･ To use the printer output function, an optional 3909

INTERFACE PACK is required. The printer must
be provided by the user.
Printer with RS-232C interface.
Standard printers such as the EPSON PM series and
the CANON BJ series for personal computers
cannot be used.

LCD display

MEAS indicator

Laser indicator

Memory No.
indicator

Emissivity
indicator

SET indicator

TIME

indicator

Battery indicator

Measured value

indicator

℃

indicator

FULL indicator

LCD display

・MEAS indicator : Displayed when measurement

is being carried out.

・Laser indicator : Displayed when laser is not

emitted.
Blinks when laser is being
emitted.

・No. indicator : Displayed together with address of

data memory.

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Chapter 1 Summary

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7

・

indicator : Appears when the thermal

ε

emissivity is being set.

・SET indicator : Blinks when date, time, and

emissivity are being set.

・TIME indicator : Displayed when time is set and

the time of data memory is

displayed.

Blinks: during time operation.

・FULL indicator : Blinks when data memory is

full. (max. 130)

indicator : Unit of Fahrenheit.

・
・

indicator : Unit of Celsius.

℃

・

indicator : Blinks when battery needs to be

replaced.

・Measured value : The entire display blinks when

the measurement value falls
outside the measurement range
(-58.0 to 932.0

, -50.0 to

500.0℃).

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Chapter 1 Summary

8

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Chapter 1 Summary

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9

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".

4. Setting the date and time

For how to set the date and time, refer to "2.2
Setting the date and time ".

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Chapter 2 Prior to Use

10

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2.1 Battery Loading and Replacement

･ The thermometer does not come with the battery

loaded. Load the battery according to the procedure
described below.

･ If the battery indicator

promptly replace the battery.

･ 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

battery 6LR61

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.

starts to blink,

rubber gasket

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Chapter 2 Prior to Use

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11

DANGER

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

12

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NOTE

･ All settings are lost when the battery is replaced.

After replacing the battery, please re-set the
emissivity, date and time. For details, see 2.2,
Setting the Date and Time* and 3.3, Setting

Emissivity (ε).

･ 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 3443-01 have a short

time.

2.2 Setting the Date and Time

When using the unit first time or after replacement
of the battery, set the date and time.

Date
Operating procedure

1. Display the date.

key when the

Press the

C

power is OFF. The date
can then be set (the word
SET will blink).

key is

Every time

C

pressed, the setting item
changes in the order of

day → month → year.

month

year

day

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Chapter 2 Prior to Use

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13

2. Change the date.

Blinking figures can be
changed with the

▼ ▲

keys.

3. Completing the date
setting.

Pressing the

key moves

T

to the time setting mode.
Pressing the

MEAS

key

completes the date setting.

NOTE

･ Setting is also possible for a date that does not

actually exist (for example, November 31, February
31, etc.), so confirm the date after setting it.

Time
Operating procedure

1. Display the time.

Press the

key when the

T

power is OFF. The time is
displayed, and the word
TIME will blink. Press the

key again. The time can

T

be set (the word SET will
blink).

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Chapter 2 Prior to Use

14

―――――――――――――――――――――――――――

2. Change the time.

Using the

▼ ▲

keys, set
the present time.
Time is displayed in 24­hour format.

3. Completing the time
setting.

Pressing

key moves to

C

the date setting mode.
Pressing the

MEAS

key

completes the setting.

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Chapter 2 Prior to Use

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15

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

NOTE

――――――――――――――――――――――――

･ If, from the power off condition, the

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.

MEAS

key.

Chapter 3 Making Measurements

MEAS

key is

MEAS

key

16

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DANGER

With the 3443-01, whenever the indication is
flashing, the laser marker beam (class 2) 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. Aim the laser beam at the object whose temperature
is to be measured.

5. Read the display.

6. End measurement.
Measurement ends when
you release the

MEAS

key. The laser marker
beam goes off and the
current measured value is
stored under the memory
number indicated by No.
The power then goes off after 15 seconds.

NOTE

･ When the measurement value is out of the

measurement temperature range (-58.0 to 932.0

,

-50.0 to 500.0℃), the display will flash.

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Chapter 3 Making Measurements

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17

3.2 Target Size and Sighting

NOTE

･ Although the field of measurement and the sighting

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 4­ft. 12-in. (1.5 meters).

･ Even if the measurement distance is greater than 6-

ft. 7-in. (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

distance

Target

size

Sighting

pitch

――――――――――――――――――――――――

1'8

"

0.5 m

0.79

φ20 mm

1.34

34 mm

"

"

3'3

"

1m

0.95

"

φ24 mm

1.61

"

41 mm

Chapter 3 Making Measurements

4'12

1.5 m

1.89

φ48mm

1.89

48 mm

"

"

"

6'7
2m

φ80 mm

"

3.15

2.17

55 mm

"

"

18

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3.3 Setting Emissivity (ε)

Each substance has particular emissivity. Precise
measurement requires appropriate setting.

1. Displaying emissivity

(ε)

With the power off,
display the emissivity
setting by pressing the

MEAS

holding the
begins flashing.

2. Setting emissivity (ε)

Numerals can be changed
with the

while pressing and

P key. SET

▼ ▲

key.

3. Completing setting of

emissivity (ε)

Press the

MEAS

key to
complete the setting.
Measurement can be
started immediately.

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Chapter 3 Making Measurements

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19

Substance Thermal

emissivity

Asphalt 0.90 to 0.98 Charcoal

Concrete 0.94 Lacquer 0.80 to 0.95
Cement 0.96 Lacquer (matt) 0.97
Sand 0.90 Rubber (black) 0.94
Earth 0.92 to 0.96 Plastic 0.85
Water 0.92 to 0.96 Timber 0.90
Ice 0.96 to 0.98 Paper 0.70 to 0.94
Snow 0.83 Aluminium

Glass 0.90 to 0.95 Chromium

Ceramic 0.90 to 0.94 Copper oxides 0.78
Marble 0.94 Iron oxides 0.78 to 0.82
Fluorite 0.30 to 0.40 Nickel oxides 0.90
Plaster 0.80 to 0.90 Titanium

Mortar 0.89 to 0.91 Zinc oxides 0.11 to 0.28
Brick (red) 0.93 to 0.96 Brass oxides 0.56 to 0.64
Textiles 0.90 Uneven

Cloth (black) 0.98 Rolled

Human skin 0.98 Heavily rusted

Leather 0.75 to 0.80

Substance Thermal

emissivity

0.96

(powder)

0.76

oxides

0.81

oxides

0.40 to 0.60

oxides

0.55
bronze
surfaces

0.45
stainless steel

0.69
iron

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Chapter 3 Making Measurements

20

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NOTE

･ Variations in the surface condition and color of the

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 or black body spray (sold separately)
should be used. In this case the setting for thermal

emissivity (ε) should be the value indicated on

black body tape or black body spray.

3.4 Storing the Data

NOTE

Releasing the

MEAS

completes the
measurement and stores
the measured value in the
address indicated by
memory "No." Data can
be stored in any address
(1 to 84) by changing the
No. using the

▼ ▲

Further, multiple data can be stored in the same
address.

･ The maximum number of measurements that can be

stored is 130. A maximum of 130 measurements can
be stored in memories No. 1 to No. 64.

･ It is recommended to clear all memory data before

storing new data.

･ When the battery is runs out, all memory data is

lost.

key

keys.

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Chapter 3 Making Measurements

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21

Displaying data memory

The data of the last
memory No. in the stored
data can be displayed
using the

▼ ▲

keys.
Data in the same No. can
be displayed using the

▲

keys while pressing the

▼

T key. The time of data
memory is displayed.
Clearing the data memory

C

Pressing the

key clears
the displayed data.
Display the past data in
the same memory No. by
pressing the
with the

▼ ▲

T

key held down.

Then, press the

keys

C key.

The displayed data will be
cleared.

C

NOTE

･ Press the

keywiththePkey held down when the
power is OFF. The date can be confirmed after the
data memory has been completely cleared.

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Chapter 3 Making Measurements

22

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3.5 Switching between Fahrenheit and
Celsius, and Erasing All Data from
Memory

To switch between Fahrenheit and Celsius displays,
perform the following operation when turning on the
electrical power:
On shipment from the factory, the HiTESTER is set
to display temperature in degrees Fahrenheit.

1. If, with the power off, the

MEAS

turn the power on while

the ▲ key is being held

down, the temperature
display will be set to show
the temperature in degrees

Celsius (゜C).

key is pressed to

2. However if, with the
power off, the
is pressed to turn the

power on while the ▼ key

is being held down, the
temperature display will
be set to show the
temperature in degrees Fahrenheit (
Changing the temperature display unit erases all
data from memory.
This operation can thus also be used as a memory
erase function.

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Chapter 3 Making Measurements

MEAS

key

).

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23

3.6 Turning the Power Off

The unit has an auto power off function. The power
goes off after 15 seconds if no control action is
performed.
If you need to check the measured temperature value

NOTE

again, just press the

･ During measurement, the auto power off function

does not operate.

MEAS

key once.

3.7 Using the Temperature HiTESTER
with a Personal Computer

Using the optional 3909 INTERFACE PACK, you
can transfer measurements stored in the 3443-01
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 and saving it to
floppy disk.

1. Using the 3909 modular cable, expansion box, and
an RS-232C null-modem cable (not included),
connect the 3443-01 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

24

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Chapter 3 Making Measurements

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25

Chapter 4

Specification

Product type

Detector / optical lens
Measurement

wavelength
Measurement

temperature range
Display resolution
Guaranteed accuracy

period
Accuracy of

measurement

-58.0 to 31.9

32.0 to 392.0

392.1 to 932.0

200.1 to 500.0

0.0 to 200.0

-50.0 to -0.1

Repeatability

Response time

3443-01 Temperature HiTester

(Field Type)
thermopile / silicon
8to16μm

-58.0 to 932

-50.0 to 500.0

0.1 , 0.1

1year

±

10%rdg. -6.8

±

3.6

±

1%rdg. -0.32

ε

=1.0, temperature of case 64.4 to

82.4

℃

±

℃

±2℃

℃

±
ε

ambient humidity 55 %RH

±
±
±
±1℃

Max. 1.6 s (95% response)

, ambient humidity 55 %RH

1%rdg.

10%rdg.±2
=1.0, temperature of case 23±5℃,

1.8

0.9 (32.0 to 932.0 )

0.5℃(0.0 to 500.0℃)
(-50.0 to -0.1℃)

℃

℃

℃

(-58.0 to 31.9 )

Target size
Sighting
Data memory

――――――――――――――――――――――――

24±3 mm/m (90% energy limit)
2-beam laser marker (class 2)
1 to 64 (multiple data can be stored

in the same No.)

Chapter 4 Specification

26

―――――――――――――――――――――――――――

Number of memory
Displayable memory

content
Thermal emissivity

compensation

Auto power off

Sampling rate
Other functions

Power source

Maximum rated power
Battery life

Ambient temperature
and humidity for use

Storage temperature

Location for use

Dimensions

Mass

Dustproof, waterproof
Applicable standards

Accessories supplied

130 (total of No. 1 to No. 64)
No. + measured value + time

Normally fixed at 0.95 (can be
changed in 0.10 to 1.00 with the
keys)

approx. 15 sec. (HOLD and SET
mode)

0.8 s
Date setting, time setting, memory

clear, memory full display, printer
output, RS-232C interface : *1

Rated supply voltage 9 VDC×1
6F22 manganese battery×1
6LR61 alkaline battery×1

252mVA (max.)
Approx.20 hours under continuous

operation at sighted lighting (alkali
battery)

32 to 104 ,0to40℃,

35 to 85% RH; no condensation

-4 to 131 ,-20to55℃;

no condensation
Indoor,

altitude up to 6562 feet, 2000 mm

1.85"W×7.87"H×1.89"D approx.
47W×200H×48D mm approx.

9.88 oz. approx. (excluding battery)
280 g approx. (excluding battery)

IP54 : *2
EMC:

EN61326:1997+A1:1998+A2:2001+A
3:2003

instruction manual, Carrying case,
Hand Strap, 6F22 manganese
battery, screwdriver (for remove the
battery cover)

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Chapter 4 Specification

―――――――――――――――――――――――――――

27

Options

3909 INTERFACE PACK, Black
body tape, Black body spray, AC
Adapter (AC-10), 9442 PRINTER,
9443-03 AC ADAPTER (for printer),
9444 CONNECTION CABLE (for
printer)

*1 : To use the printer output function and RS-

232C interface, an optional expansion kit is

required.

*2 : IP54:No harmful influence when splashed from

any direction(based on IEC529 (1989))

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Chapter 4 Specification

28

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29

Chapter 5

Maintenance and

Service

WARNING

Do not attempt to adjust or repair the unit with

･

the case open. Such adjustments or repairs
should only be made by a t echnician who fully
understands the dangers involved.

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.

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Chapter 5 Maintenance and Service

30

―――――――――――――――――――――――――――

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 shipment.
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.

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Chapter 5 Maintenance and Service

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31

5.1 Troubleshooting

Problem Cause Solution

No display

Measured
temperature
value peculiar

℃

blinks

The display
shows "Err"

･

Batteries

exhausted, poorly
contacting, or
wrongly inserted.

･

Lens dirty

･

A heat source such

asahigh
temperature body
is present close
by.

･

The thermal

emissivity value is
not appropriate.

･

Operating

temperature range
(32 to 104
40℃) exceeded.

･

The unit is faulty.

,0to

･

Change the

battery, or insert
them correctly.

･

Clean the lens.

･

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.

･

Contact a service

facility.

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.

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Chapter 5 Maintenance and Service

32

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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 16μm) 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.

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Chapter 5 Maintenance and Service

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33

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 16μm) used by this device for
temperature measurement. Therefore accurate
temperature measurement is possible, irrespective of
the measurement distance.

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Chapter 5 Maintenance and Service

34

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Chapter 5 Maintenance and Service