General Tools IRT656 User Manual [en, es, fr]

INTRODUCTION:

Thank you for purchasing this Infrared Thermometer. This is a non-contact infrared temperature measuring instrument.
Features include a 4 digits backlit LCD, scan/hold/auto function and auto power off (6 seconds). To measure a temperature,
point the unit at the desired object, pull the measuring trigger and hold till the end of the shot. Make sure the target area is
larger than the unit’s spot size.

IRT656

USER’S MANUAL

Low Range Infrared Thermometer for

Food, AC and Refrigeration

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FEATURES:

• New series for food, storage and general purposes

• Ultra low power consumption in shutdown mode

• Extended long time measuring reliability

• Laser sighting On/Off is switchable

• Backlit LCD display

• °F or °C selectable

• Electronic trigger lock

• Temperature data storage

• Audible alarms

APPLICATIONS:

• Manufacturing processes of semiconductor technology

• Food safety and processing

• Super low temperature science experiment

• HVAC energy audits

• Electrical troubleshooting

• Testing terminals on circuits

• Air conditioning

SAFETY INFORMATION:

Read the following safety
information carefully before attempting to operate or
service the meter. Only qualified personnel should
perform repairs or services not covered in this manual.

LASER WARNING NOTE!

• Do not point laser directly at eyes.

• Use caution around reflective surfaces.

• Keep out of reach of children!

CAUTIONS!

• DO NOT submerge the unit in the water.

• This product is not designed for use in medical
evaluations. The product can only be used to measure
body temperature for reference. It is meant for
industrial and scientific purposes.

SAFETY SYMBOLS

Dangerous, refer to this manual before using the
meter.

CE Certification

This instrument conforms to the following standards:
EN61326: Electrical equipment for measurement, control and

laboratory use.

IEC61000-4-2: Electrostatic discharge immunity test.
IEC61000-4-3: Radiated, radio-frequency, Electromagnetic

field immunity test.

IEC61000-4-8: Power frequency magnetic field immunity

test.

Tests were conducted using a frequency range of
80-1000MHz with the instrument in three orientations.

The average error for the three orientations is ±1.0 °F
(±0.5 °C) at 3V/m throughout the spectrum. However,
between 781-1000MHz at 3V/m, the instrument may not
meet its stated accuracy.

The device may not be disposed in the trash. It

promotes the re-use recycling and other forms of
recovery of used materials and components, and to improve
the environmental performance of all operators (manu­facturers, traders, treatment facilities) involved in the life
cycle of products. Dispose of the product appropriately in
accordance with relevant regulations.

SPECIFICATIONS:

Distance/Spot Ratio: 12:1
Temperature Range: -58° to 600°F (-50° to 316°C)
Accuracy(@ ambient temperature of 77°F/25°C):

±5°F (±3°C) within -58° to -22°F (-50° to -30°C)
±3°F (±2°C) within -22° to 212°F (-30° to 100°C)

±2% within 212° to 600°F (100° to 316°C)
Thermopile: 8 ~ 14µm
Repeatability: ±2°F (±1°C)
Resolution: 0.1°F (0.1°C)
Response Time: 500 ms.
Operating Temperature: 32° to 122°F (0° to 50°C),

10 to 90%RH

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Auto Power Off: Automatically after approx. 6 seconds
Emissivity: Fixed at 0.97
°F/°C Switchable: YES
Backlight: YES
Laser Sight Switchable: YES
Audio Alarm: YES
Dimensions: 6.69" x 5.23" x 1.77" (170 x 133 x 45mm)
Battery Type: “9V” battery
Battery Life: 16 hours
Weight: 5.8 oz. (163 g) Approx.
Accessory: “9V” battery, Instruction Manual,

Soft Carrying Case

OPERATIONS OF INSTRUMENT

QUICK START:

To measure a temperature, point the unit at the target that
you want to measure, pull the measuring trigger and hold. In
SCAN mode, the LCD displays either the current temperature
in Celsius or Fahrenheit.

The unit will HOLD the last reading for about 6 seconds after
the trigger is released; the word HOLD appears.

Be sure to consider the target area that is inside the angle of
vision of this instrument.

The single spot of laser is used for aiming only.

UNIT DIAGRAM:

LCD DISPLAY:

°F/°C AND BATTERY
CHANGE:

The unit is powered by
“9V” battery and displays
temperature in either
°F/°C. The user has to
replace the battery when
the battery voltage drops
below the voltage for
reliable operation and
at the same time the

low battery symbol will

appear. To change the
“9V” battery, pull and open the unit’s handle by using the
finger. Change the “9V” battery with a new one and push the
battery cover back in place.

TECHNIQUES OF INFRARED THERMOMETER:

FIELD OF VIEW (FOV) RATIO =
DISTANCE TO DIAMETER (DS) RATIO

The field of view is the angle of vision at which the
instrument operates and it is determined by the optics of the
unit. The FOV is the ratio of the distance from the target to
the target diameter. The smaller the target, the closer you
should be to it. When the target diameter is small, it is
important to bring the
thermometer closer to
the target to insure that
only the target is
measured, excluding
the surroundings.

Display
Screen

Scan/Hold mode

indication

Laser on/off indication

Low battery

°F/°C indication
Temperature

indication

°F/°C switchable

Laser On/Off

“9V” battery

Laser
Sighting

Measuring
Window

Measuring
Trigger

Battery
and Cover

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EMISSIVITY:

Emissivity is the ability of an object to omit or absorb energy.
Perfect emitters have an emissivity of 1, emitting 100% of
incident energy. An object with an emissivity of 0.8 will
absorb 80% and reflect 20% of the incident energy.
Emissivity is defined as the ratio of the energy radiated by an
object at a given temperature to the energy emitted by a
perfect radiator at the same temperature. All values of
emissivity fall between 0.0 and 1.0.

Non-contact temperature sensors measure IR energy emitted
by the target, have fast response, and are commonly used to
measure moving and intermittent targets, targets in a
vacuum, and targets that inaccessible due to hostile
environments, geometry limitations, or safety hazard. The
cost is relatively higher, although in some cases it is
comparable to contact devises.

MAINTENANCE:

Cleaning the lens: Blow off loose particles using clean
compressed air. Gently brush remaining debris away with a
camel’s hair brush. Carefully wipe the surface with a moist
cotton swab. The swab may be moistened with water.

NOTE:

DO NOT use solvents to clean the lens.
Cleaning the housing: Use soap and water on a damp sponge

or soft cloth.

EMISSIVITY TABLE (FOR REFERENCE)

Material Temp °F/°C Emissivity
Gold (pure highly polished) 227/440 0.02
Aluminum Foil 27/81 0.04
Aluminum Disc 27/81 0.18
Aluminum Household (flat) 23/73 0.01
Aluminum (polished prate 98.3%) 227/400 0.04

577/1070 0.06
Aluminum (rough plate) 26/78 0.06
Aluminum (oxidized @ 599°C) 199/390 0.11

599/1110 0.19
Aluminum surfaced roofing 38/100 0.22
Tin (bright tinned iron sheet) 25/77 0.04
Nickel wire 187/368 0.1

Material Temp °F/°C Emissivity
Lead (pure 99.95-unoxidized) 127/260 0.06
Copper 199/390 0.18

599/1110 0.19

Steel 199/390 0.52

599/1110 0.57
Zinc galvanized sheet iron (bright) 28/82 0.23
Brass (highly polished) 247/476 0.03
Brass (hard rolled-polished w/lines) 21/70 0.04
Iron galvanized (bright) - 0.13
Iron plate (completely) 20/68 0.69
Rolled sheet steel 21/71 0.66
Oxidized iron 100/212 0.74
Wrought iron 21/70 0.94
Molten iron 1299-1399/ 0.29

3270-2550
Copper (polished) 21-117/70-242 0.02
Copper (scraped shiny not mirrored) 22/72 0.07
Cooper(plate heavily oxidized) 25/77 0.78
Enamel(white fused on iron) 19/66 0.9
Formica 27/81 0.94
Frozen oil - 0.93
Brick(red-rough) 21/70 0.93
Brick (silica-unglazed rough) 1000/1832 0.8
Carbon (T-carbon 0.9% ash) 127/260 0.81
Concrete - 0.94
Glass (smooth) 22/72 0.94
Granite (polished) 21/70 0.85
Ice 0/32 0.97
Marble (light gray polished) 22/72 0.93
Asbestos board 23/74 0.96
Asbestos paper 38/100 0.93

371/700 0.95
Asphalt (paving) 4/39 0.97

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