Hioki FT3700-20, FT3701-20 Instruction Manual

Warranty

FT3700-20
FT3701-20

INFRARED THERMOMETER

Instruction Manual

September 2013 Revised edition 2 Printed in Japan

FT3700A981-02 13-09H

1. Hold the instrument with both hands as

shown in the diagram.

2. Twist the battery cover in the direction as

shown in the diagram to open it.

3. Take out the batteries.

4. Install new batteries (LR03) in the case,

being careful to observe proper battery
polarity.

5. Close the battery cover.

Battery cover

Remaining battery life indicator

There is ample battery life remaining.
Replace the batteries soon.
No battery life remaining. The instru-

ment cannot be used in this state.

2

1

3

4

5

6

7

8

8

9

10

LCD Display

1. Indicates the lit setting for laser marker. (When this lamp is off,

the laser maker beam is not emitted)

This lamp will blink when the laser marker beam is being emitted
during lit setting.

2. Indicates the backlight setting. (When this lamp is off, the laser

maker beam is not emitted)

3. "HI" indicates that the alarm setting's upper limit temperature

has been exceeded. "LO" indicates that the reading is lower
than the lower limit temperature.

4. Indicates that measurement is in progress.

5. Indicates the battery consumption level (refer to Replacing

Battery)

6. Main display: Indicates the measurement value.

7. Sub-display: Indicates the mode and associated value.

8. Indicates the temp erature units.

9. Indicates that the measurement value is being maintained.

10. Indicates that continuous measurement mode is active.

1432

7

6

5

Warranty malfunctions occurring under conditions of normal use in con­formity with the Instruction Manual and Product Precautionary Mark­ings will be repaired free of charge. This warranty is valid for a period
of one (1) year from the date of purchase. Please contact the distribu­tor from which you purchased the product for further information on
warranty provisions.

Introduction

Thank you for purchasing the HIOKI “Model FT3700-20,
FT3701-20 INFRARED THERMOMETER.” To obtain maximum
performance from the instrument, please read this manua l fir st,
and keep it handy for future reference.

Overview

The Model FT3700-20, FT3701-20 is a non-contact thermome­ter using infrared rays.
It can measure the surface temperature of an object by measur­ing the energy level of the infrared rays emitted from the object
without touching it.

• Liquid crystal display with backlight

• Two-point Lase r marker beams

• Thermal emissivity setting function

• Display and sound alarm functions

Inspection and Maintenance

Initial Inspection

When you receive the instrument, inspect it carefully to ensure
that no damage occurred during shipping. In particular, check
the accessories, the liquid crystal display, the control keys, and
the lens. If damage is evident, or if it fails to o perate according to
the specifications, contact your dealer or HIOKI representative.

Maintenance and Service

• To clean the instrument, wipe it gently with a soft cloth moistened with
water or mild detergent. Never use solvents such as benzene, alcohol,
acetone, ether, ketones, thinners or gasoline, as they can deform and
discolor the case.

• If the instrument seems to be malfunctioning, confirm that the batteries
are not discharged before contacting your dealer or HIOKI representative.

• Pack the instrument so that it will not sustain damage during shipping,
and include a description of existing damage. We do not take any
responsibility for damage incurred during shipping.

1234

Safety

• Do not store or use the instrument where it could be exposed

Names and Function of Parts

to direct sunlight, high temperatur e or humidity, or conden­sation. Under such conditions, the instrument may be dam-

Mishandling this instrument during use could result in
injury or death, as well as damage to the instrument. Be
certain that you understand the instructions and precau­tions in the manual before use. We disclaim any respon­sibility for accidents or injuries not resulting directly
from instrument defects.

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

Safety Symbol

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

Indicates warnings relating to the laser.

Symbols for Various Standards

WEEE marking:
This symbol indicates that the electrical and electronic appli­ance is put on the EU market after August 13, 2005, and pro­ducers of the Member St ates are required to display it on the
appliance under Article 11.2 of Directive 2002/96/EC (WEEE).

This symbol indicates that the product conforms to safety reg­ulations set out by the EC Directive.

The following symbols in this manual indicate the relative importance
of cautions and warnings.

Indicates that incorrect operation presents an extreme haz­ard that could result in serious injury or death to the user.

Indicates that incorrect operatio n presen ts a significant haz­ard that could result in serious injury or death to the user.

Indicates that incorrect operation presents a possibility of
injury to the user or damage to the device.

Indicates advisory items related to performance or correct
operation of the instrument.

Usage Notes

Follow these precautions to ensure safe operation and to obtain the full
benefits of the various functions.

Preliminary Checks

Before using the instrument the first time, verify that it operates normal­ly to ensure that the no damage occurred during storage or shipping.
If you find any damage, contact your dealer or HIOKI representative.

aged and insulation may deteriorate so that it no longer
meets specifications.

• This instrument is not designed to be entirely water- or dust­proof. Do not use it in an especially dusty environment, nor
where it might be splashed with liquid. This may cause damage.

• Do not use the instrument where it may be exposed to corrosive
or combustible gases. The instrument may be damaged.

• Do not use the instrument near a source of strong electro­magnetic radiation, or near a highly electrically charged ob­ject. These may cause a malfunction.

• To avoid damage to the instrument, protect it from physical
shock when transporting and handling. Be especially careful
to avoid physical shock from dropping.

• 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.

The indicator flashes when the remaining battery capacity
is low. In this case, the instru ment's reliability is not guaranteed.
Replace the battery immediately.

Replacing Batteries

When replacing the batteries, be careful not to acciden­tally pull the measuring trigger key. This may cause the
laser marker to enter the eyes and is extremely danger­ous. After replacing the batteries, be sure to close the
cover before using the instrument.

• Battery may explode if mistreated. Do not short-circuit,
recharge, disassemble or dispose of in fire.

• Handle and dispose of battery in accordance with local
regulations.

• Do not mix old and new batteries, or different types of batter-

Display

1. LCD

2. MODE Key

Changes the instrument's mode (see "Changing the Mode").

3. Down/°C/ °F Key

Press one time: Changes (decreases) the setting.
Press and hold while pulling the measurement trigger (1 sec.):

Change temperature units (except when using the emissivity
setting, HAL mode, or LAL mode).

4. Up/LOCK Key

Press one time: Changes (increases) the setting.

Press and hold while pulling the measurement trigger (1 sec.):

5. Meas. Key

Pull the trigger to switch on the power to start measuring.

6. Infrared Lens

Infrared rays from the object whose temperature is to be measured
are received here.

7. Laser

The laser marker beams are emitted from here.

8. Battery cover

Toggles the laser marker on and off.

Turns continuous measurement mode on and off
(except when using the emissivity setting, HAL
mode, or LAL mode).

Toggles the backlight on and off.

ies. Also, be careful to observe battery polarity during instal­lation. Otherwise, poor performance or dam age from battery

Do not allow the laser light beam to impinge upon any
gas which can explode.

leakage could result.

• To avoid corrosion and damage to this instrument from bat­tery leakage, remove the batteries from the instrument if it is
to be stored for a long time.

• Use of controls or adjustments or performance of proce­dures other than those specified herein may result in hazard ­ous radiation exposure.

•The Model FT3700-20, FT3701-20 uses as a light source a
semiconductor laser which emits visible light, and which con­form s to IEC stan dard clas s 2 (IEC 60825-1). (Wavelength
640 nm to 660 nm, 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.

• This instrument should be installed and operated indoors on­ly, between 0 and 50°C and 80% RH or less.

The battery cover has been d esigned to fit tightly in order pr e­vent accidental opening.

Measurement

1. Turning the Power On

With the power switch at OFF, pull the measuring trigger key to switch
on the power to start measuring.

2. Thermal emissivity setting

•Press the

MODE

key to activate emissivity mode (“ E " will be

shown on the display).

• Press the

 keys to set thermal emissivity.

• Refer to the section on thermal emissivity for thermal emissivity setting.

3. Measuring

Direct the lens toward the object whose temperature is to be measured.

Measurement field of view

Model FT3700-20

Model FT3701-20

1. Pull the measuring trigger key to switch on the power.

2. Press the

MODE

key to display "HAL" in the sub-display.

Press the

 key to set the alarm setting's upper limit temperature.

3. Press the

MODE

key to display "LAL" in the sub-display.

Press the

 key to set the alarm setting's lower limit temperature.

Refractory & Building Materials

Alumina (coarse grain) 0.45
Alumina (fine grain) 0.25
Asbestos 0.95
Carbon (graphite) 0.75
Carbon (soot) 0.95
Carborundum(Trademark ) 0.85
Concrete 0.7
Fire clay 0.75
Marble 0.90
Plaster 0.90
Quartz (rough) 0.90
Red brick (rough) 0.75 to 0.90
Silica (coarse grain) 0.55
Silica (fine grain) 0.40
Timber (various) 0.80 to 0.90
Zirconium silicate at 850°C

0.60

Zirconium silicate up to
500°C

0.85

Miscellaneous

Aluminum lacquer 0.50
Enamel (any color) 0.90
Lacquer 0.90
Matte black paint 0.95 to 0.98
Oil paint (any color) 0.95
Paper and cardboard

0.90

Plastics 0.80 to 0.95
Plastics films

(0.05 mm thick)

0.50 to 0.95

Polythene film
(0.03 mm thick)

0.20 to 0.30

Rubber (rough) 0.98
Rubber (smooth) 0.90
Silicone polish 0.70
Water 0.98

Metal

Aluminum
(heavily oxidized)

0.25

Aluminum Alloys various 0.10 to 0.25
Aluminum oxide at 260°C 0.60
Aluminum oxide at 800°C 0.30
Brass (oxidized) 0.60
Brass (polished) 0.10
Brass (roughened surface)

0.20
Cast iron (polished) 0.20
Cast iron (rough) rusted 0.95
Cast iron (turned at 100°C)

0.45
Cast iron

(turned at 1000°C)

0.60 to 0.70
Copper (oxidized) 0.80

Copper (polished) 0.05
Iron plate(rusted) 0.70 to 0.85
Lead (oxidized at 25°C) 0.30
Lead (oxidized at 200°C)

0.60
Lead (pure) 0.10
Mild steel 0.30 to 0.50
Molten cast iron 0.30
Molten copper 0.15
Nichrome 0.70
Nichrome (oxidized) 0.95
Nickel (pure) 0.10
Nickel plate (oxidized)

0.40 to 0.50
Polished aluminum 0.10
Rough ingot iron 0.90
Stainless steel (polished) 0.10
Stainless steel (various) 0.20 to 0.60
Steel 0.60
Steel plate (oxidized) 0.90

Whenever the indication is blinking, the laser marker beam
is being emitted. Exercise extreme care not to allow the laser
marker beam to enter your eyes or those of another person.
Because of this laser light causing damage to the eyes.

• Consecutive measurements are carried out by pulling and holding the
measuring trigger key. Measurement will stop when the measuring
trigger key is released and the last shown value will be retained.

• The instrument will automatically switch off approximately 15 seconds
after the measuring trigger key is released.

• The laser marker indicates the diameter of the measurement field of
view.

• The measurement field of view is defined as the measurement diameter
in which the optical response is 90%. The object whos e temperature is to
be measured needs to be larger than the measurement diameter by an
adequate margin. (1.5 to 2 times or more)

ON/OFF setting for laser marker

The laser marker is set to OFF in the factory default or immediately af­ter replacing the batteries. To turn ON the laser marker, press and hold
the  key (1 sec) while pulling the measuring trigger key.
To turn OFF the laser marker is the same operation again.

Continuous measurement mode

Pressing the 
ous measurement mode, except when using the emissivity setting,
HAL mode, or LAL mode. This mode lets you take measurements con­tinuously without needing to pull the measurement trigger.

• The instrument will turn off automatically about 60 minutes after continu­ous measurement mode is activated.

• When the laser marker is on, the sighting laser will only activate when
the measurement trigger is pulled.

• Key response may be slow when continuous measurement mode is on.

/LOCK

key while the instrument is on activates continu-

5 678

Changing the Mode

Pressing the
cle through the following modes:

E Emissivity display LAL Alarm lower limit setting

E Emissivity setting HAL Alarm upper limit setting

MAX Maximum value display AVG Average value display

MIN Minimum value display dIF

MAX/MIN/DIF/AVG measurement

The instrument will display the maximum value, minimum value,
difference between the maximum and mini mum values, and av­erage value since measurement began.

• Press the
display.

• The MAX/MIN/DIF/AVG value will be refreshed when you pull the mea­surement trigger or while continuous measurement mode is act ive.

• When using the continuous measurement mode, the key response may
be slow.

MODE

key while the instrument is on causes it to cy-

Difference between maxi­mum and minimum values

MODE

key to display "MAX", "MIN", "dIF" or "A VG" on the sub-

Alarm Function

The alarm can be set to go off whenever a value which is higher
or lower than a threshold value inputted beforehand is rea ched.

The alarm is in the form of a display and a buzzer.

Error Indication

Error Indication

to

or

Description Remedy

The change in
ambient tempera­ture is too great.

The ambient tem­perature is outside
the operating tem­perature range.

System error

The measurement
value is outside the
measurement
range.

Allow the instrument to acclimate to the
ambient temperature for about 30 min­utes before use.

Use the instrument within the operating
temperature range (0°C to 50°C).

Remove the battery, wait at least 1 min­ute, and then replace the battery.
If you are unable to resolve the error, the
instrument may be broken. Contact your
dealer or HIOKI representative.

The measurement value cannot be dis­played since it is outside the measure­ment range.

Warning Labels

Location of labels used in the HIOKI “FT3700-20, FT3701-20 Infrared
Thermometer” is as follows.

Specifications

Basic Specifications

Function Infrared temperature measurement
Additional Function
Power supply

Dimensions

Mass

Location for use
Operating temperature

and humidity
Storage temperature

and humidity

Accessories

Effect of radiated radio-fre­quency electromagnetic field

Applicable standards

Electrical characteristics

Detection element Thermopile
Temperature units °C, °F

Measurement tempera­ture range

Display resolution
Outside display of mea-

surement range

Response time 1 second (90%)
Measurement wavelength 8 to 14 m
Thermal emissivity

compensation
Diameter of field of

measurement
Sighting Two-point laser marker, 1 mW (MAX), Red (640 nm

Battery low warning volt­age

Rated supply voltage 1.5 VDC × 2
Maximum rated powers
Continuous operating time

Auto Power Off

Accuracy Specifications

Accuracy (infrared)

Guaranteed accuracy
period

Accuracy guarantee for
temperature and humidity

Temperature coefficient

Accuracy

rdg. :reading value (The value currently being measured and indica ted on the
measuring instrument)

MAX, MIN, DIF (MAX-MIN), AVE measurement,
Alarm function, Backlight function

LR03 alkaline battery × 2
Approx. 48 W × 172 H × 119 D mm

(1.89”W × 6.77”H × 4.69”D)(excluding projections)
Approx. 256 g (9.0 oz.)

(including LR03 alkaline battery × 2)
Indoors, altitude up to 2000 m (6562-ft.)
0 to 50°C (32°F to 122°F), 80%RH or less (non-

condensation)

-10 to 50°C (14°F to 122°F), 80%RH or less (non­condensation)

50 to 60°C (122°F to 140°F), 70%RH or less (non­condensation)

Instruction manual, LR03 alkaline battery × 2,
Carrying case × 1

±70°C at 3 V/m
EMC : EN61326

Laser: IEC60825-1:1993+A1:1997+A2:2001

CLASS 2 LASER

This product is complied with 21 CFR 1040.10 and

1040.11 except for deviations pursuant to Laser
Notice No.50, dated June 24, 2007

FT3700-20: -60 to 550°C (-76 to 1022°F)
FT3701-20: -60 to 760°C (-76 to 1400°F)

0.1°C, 0.1°F (1°F at 1000°F and over）
FT3700-20:

"Lo" mark lights when -60.0°C (-76.0°F) or less
"Hi" mark lights when 550.0°C (1022°F) or higher

FT3701-20:

"Lo" mark lights when -60.0°C (-76.0°F) or less
"Hi" mark lights when 760.0°C (1400°F) or higher

0.10 to 1.00 by steps of 0.01
FT3700-20: 83 mm at 1000 mm (D:S=12:1)

FT3701-20: 100 mm at 3000 mm (D:S=30:1)
to 660 nm) It is illuminated in conjunction with pull-

ing the measuring trigger key.

mark lights when 2.70 V (±0.1 V) or higher　
mark lights when 2.70 V (±0.1 V) or less

mark flashes when 2.55 V (±0.1 V) or less,
measurement value is fixed.
Power turned off at 2.20 V (±0.1 V)

150 mVA
Approx. 140 hours (alkaline battery),

When laser marker and backlight are OFF
Approx. 15 seconds

-60.0 to -35.1°C (-76.0 to -31.1°F) Accuracy not
specified

-35.0 to -0.1°C (-31.0 to 31.9°F) ±10%rdg.±2°C
(±(T-32)×0.1±4°F　T=reading value(°F))

0.0 to 100.0°C (-32.0 to 212.0°F) ±2°C

100.1 to 500.0°C (212.1 to 932.0°F) ±2%rdg

500.1to 550.0 (932.0 to 1022 °F)(FT3700-20)

500.1to 760.0 (932.0 to 1400 °F)(FT3701-20)
Accuracy not specified
(except when battery mark is blinking)

1 year
23°C ±3°C (73°F ±5°F), 80%RH or less (non-con-

densation)
Measurement accuracy × 0.1/ °C

Thermal Emissivity

This instrument allows thermal emissivity to be adjusted within
the range of 0.10 to 1.00.Please refer to the following table
when setting the thermal emissivity.

• Variations in the surface condition and color of the object whose temper­ature is to be measured may cause the thermal emissivity () 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 (commercially available) should be
used. In this case the setting for thermal emissivity () should be the
value indicated on black body tape.

• Iron and other objects with low thermal emissivity reflect their surround­ing temperature, causing inaccuracies in measurement. The black body
tape (commercially available) is also recommended when measuring
these objects of low thermal emissivity.

• A black body is an object that represents a standard emissivity, and may

not necessarily be black in color.