5 678
The laser marker is set to OFF in the factory default or immediately af-
ter 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.
Pressing the
/LOCK
key while the instrument is on activates continu-
ous measurement mode, except when using the emissivity setting,
HAL mode, or LAL mode. This mode lets you take measurements con-
tinuously without needing to pull the measurement trigger.
Pressing the
MODE
key while the instrument is on causes it to cy-
cle through the following modes:
MAX/MIN/DIF/AVG measurement
The instrument will display the maximum value, minimum value,
difference between the maximum and minimum values, and av-
erage value since measurement began.
• Press the
MODE
key to display "MAX", "MIN", "dIF" or "AVG" on the sub-
display.
• The MAX/MIN/DIF/AVG value will be refreshed when you pull the mea-
surement trigger or while continuous measurement mode is active.
• When using the continuous measurement mode, the key response may
be slow.
The alarm can be set to go off whenever a value which is higher
or lower than a threshold value inputted beforehand is reached.
The alarm is in the form of a display and a buzzer.
Location of labels used in the HIOKI “FT3700-20, FT3701-20 Infrared
Thermometer” is as follows.
Basic Specifications
Electrical characteristics
Accuracy Specifications
Accuracy
rdg. :reading value (The value currently being measured and indicated on the
measuring instrument)
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.
Measurement
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 whose 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
Continuous measurement mode
• The instrument will turn off automatically about 60 minutes after continu-
ous 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.
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
Changing the Mode
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
Difference between maxi-
mum and minimum values
Alarm Function
Error Indication
Error Indication
Description Remedy
The change in
ambient tempera-
ture is too great.
Allow the instrument to acclimate to the
ambient temperature for about 30 min-
utes before use.
The ambient tem-
perature is outside
the operating tem-
perature range.
Use the instrument within the operating
temperature range (0°C to 50°C).
to
System error
Remove the battery, wait at least 1 min-
ute, and then replace the battery.
If you are unable to resolve the error, the
instrument may be broken. Contact your
dealer or HIOKI representative.
or
The measurement
value is outside the
measurement
range.
The measurement value cannot be dis-
played since it is outside the measure-
ment range.
Warning Labels
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.
Specifications
Function Infrared temperature measurement
Additional Function
MAX, MIN, DIF (MAX-MIN), AVE measurement,
Alarm function, Backlight function
Power supply
LR03 alkaline battery × 2
Dimensions
Approx. 48 W × 172 H × 119 D mm
(1.89”W × 6.77”H × 4.69”D)(excluding projections)
Mass
Approx. 256 g (9.0 oz.)
(including LR03 alkaline battery × 2)
Location for use
Indoors, altitude up to 2000 m (6562-ft.)
Operating temperature
and humidity
0 to 50°C (32°F to 122°F), 80%RH or less (non-
condensation)
Storage temperature
and humidity
-10 to 50°C (14°F to 122°F), 80%RH or less (non-
condensation)
50 to 60°C (122°F to 140°F), 70%RH or less (non-
condensation)
Accessories
Instruction manual, LR03 alkaline battery × 2,
Carrying case × 1
Effect of radiated radio-fre-
quency electromagnetic field
±70°C at 3 V/m
Applicable standards
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
Detection element Thermopile
Temperature units °C, °F
Measurement tempera-
ture range
FT3700-20: -60 to 550°C (-76 to 1022°F)
FT3701-20: -60 to 760°C (-76 to 1400°F)
Display resolution
0.1°C, 0.1°F (1°F at 1000°F and over）
Outside display of mea-
surement range
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
Response time 1 second (90%)
Measurement wavelength 8 to 14 m
Thermal emissivity
compensation
0.10 to 1.00 by steps of 0.01
Diameter of field of
measurement
FT3700-20: 83 mm at 1000 mm (D:S=12:1)
FT3701-20: 100 mm at 3000 mm (D:S=30:1)
Sighting Two-point laser marker, 1 mW (MAX), Red (640 nm
to 660 nm) It is illuminated in conjunction with pull-
ing the measuring trigger key.
Battery low warning volt-
age
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)
Rated supply voltage 1.5 VDC × 2
Maximum rated powers
150 mVA
Continuous operating time
Approx. 140 hours (alkaline battery),
When laser marker and backlight are OFF
Auto Power Off
Approx. 15 seconds
Accuracy (infrared)
-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)
Guaranteed accuracy
period
1 year
Accuracy guarantee for
temperature and humidity
23°C ±3°C (73°F ±5°F), 80%RH or less (non-con-
densation)
Temperature coefficient
Measurement accuracy × 0.1/ °C
Thermal Emissivity
• Variations in the surface condition and color of the object whose temper-
ature 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 emis-
sivity 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 surround-
ing 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.
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
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