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Warranty
Warranty malfunctions occurring under conditions of normal use in con-
formity with the Instruction Manual and Product Precautionary Mark-
ings 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 distribu-
tor 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 manual first,
and keep it handy for future reference.
The Model FT3700-20, FT3701-20 is a non-contact thermome-
ter using infrared rays.
It can measure the surface temperature of an object by measur-
ing the energy level of the infrared rays emitted from the object
without touching it.
• Liquid crystal display with backlight
• Two-point Laser marker beams
• Thermal emissivity setting function
• Display and sound alarm functions
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 operate 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.
This manual contains information and warnings essential for safe opera-
tion 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
Symbols for Various Standards
The following symbols in this manual indicate the relative importance
of cautions and warnings.
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 normal-
ly to ensure that the no damage occurred during storage or shipping.
If you find any damage, contact your dealer or HIOKI representative.
1. LCD Display
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.):
Toggles the laser marker on and off.
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.
Turns continuous measurement mode on and off
(except when using the emissivity setting, HAL
mode, or LAL mode).
Press and hold while pulling the measurement trigger (1 sec.):
Toggles the backlight on and off.
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
Overview
Inspection and Maintenance
FT3700-20
FT3701-20
INFRARED THERMOMETER
Instruction Manual
September 2013 Revised edition 2 Printed in Japan
FT3700A981-02 13-09H
Safety
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 precau-
tions in the manual before use. We disclaim any respon-
sibility for accidents or injuries not resulting directly
from instrument defects.
In the manual, the symbol indicates particularly important infor-
mation that the user should read before using the instrument.
Indicates warnings relating to the laser.
WEEE marking:
This symbol indicates that the electrical and electronic appli-
ance is put on the EU market after August 13, 2005, and pro-
ducers of the Member States 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 reg-
ulations set out by the EC Directive.
Indicates that incorrect operation presents an extreme haz-
ard that could result in serious injury or death to the user.
Indicates that incorrect operation presents a significant haz-
ard 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
Do not allow the laser light beam to impinge upon any
gas which can explode.
• Use of controls or adjustments or performance of proce-
dures other than thosespecified herein may result in hazard-
ous radiation exposure.
•TheModelFT3700-20, FT3701-20 uses as a light source a
semiconductorlaserwhichemits visiblelight,andwhichcon-
forms to IEC standard class 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 on-
ly, between 0 and 50°C and 80% RH or less.
• Do not store or use theinstrument where it could be exposed
to direct sunlight, high temperature or humidity, or conden-
sation. Under such conditions, the instrument may be dam-
aged and insulation may deteriorate so that it no longer
meets specifications.
• This instrument is not designed to be entirely water- or dust-
proof. 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 electro-
magnetic radiation, or near a highly electrically charged ob-
ject. 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 tempera-
ture 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 instrument's reliability is not guaranteed.
Replace the battery immediately.
Replacing Batteries
When replacing the batteries, be careful not to acciden-
tally pull the measuring trigger key. This may cause the
laser marker to enter the eyes and is extremely danger-
ous. 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-
ies. Also, be careful to observe battery polarity during instal-
lation. Otherwise, poor performance or damage from battery
leakage could result.
• To avoid corrosion and damage to this instrument from bat-
tery leakage, remove the batteries from the instrument if it is
to be stored for a long time.
The battery cover has been designed to fit tightly in order pre-
vent accidental opening.
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.
Names and Function of Parts
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 temperature units.
9. Indicates that the measurement value is being maintained.
10. Indicates that continuous measurement mode is active.
