General IRT657 User manual

12:1 WIDE-RANGE
INFRARED THERMOMETER
WITH STAR BURST
LASER TARGETING
USER’S MANUAL
IRT657
Star Burst Laser
Targeting
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
What’s in the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . 5 –7
Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing the Battery . . . . . . . . . . . . . . . . . . . . . . 7
Operating Instructions . . . . . . . . . . . . . . . . . . . . 8 – 11
How To ake Accurate IR easurements . . 9 – 11
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
aintenance and Troubleshooting Tips . . . . . . . . . 13
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 14
Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . 15
anual del Usuario . . . . . . . . . . . . . . . . . . . . . 16 – 30
anuel de L'Utilisateur . . . . . . . . . . . . . . . . . . 31 – 45
2

I TRODUCTIO
Thank you for purchasing General Tools & Instruments’ IRT657
12:1 Wide Range Infrared Thermometer with Star Burst Laser
Targeting. Please read this user’s manual carefully and thoroughly
before using the thermometer.
The IRT657 is a compact, non-contact (infrared) thermometer
with a 12:1 distance-to-spot ( :S) ratio and a wide measurement
range of -40° to 1076°F (-40° to 580°C). These two key
specifications make the IRT657 ideal for various applications,
a few of which are listed below.
Using this IR thermometer, the temperature of a target can easily
be measured from a distance. This makes it possible to safely
measure the temperature of very hot or cold surfaces, hard-to-
reach objects and toxic substances.
The IRT657 is especially suitable for the following four classes of
applications:
ELECTRICAL
• Checking the temperature of high-voltage equipment and
transformers from a safe distance
• etecting excessive heating of motors, fuses, wires, insulators,
connectors, and switches
• Pinpointing hot spots in electrical connections and bearings
• Verifying temperatures of induction-heated parts
HVAC/R
• Monitoring food processing and storage temperatures
• Checking heating, AC and refrigeration system components
• Taking the temperature of forced hot air supply and return vents
• Testing chillers, steam traps and heat exchangers
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INDUSTRIAL/MRO
• Making temperature measurements on equipment during
maintenance, repair and operations (MRO)
• Performance testing of motors, turbomachinery and boilers,
including identifying overheated bearings, couplings and
conveyor belts
• Simplifying jobs such as laying asphalt or concrete and
checking fire protection systems
AUTOMOTIVE
• etecting overheated electrical components, connectors and
wiring harnesses
• Pinpointing radiator core restrictions
• Testing temperature sensors, catalytic converters and exhaust
systems
• Measuring the temperature of oil, batteries, A/C systems and
tire treads
The IRT657 has a backlit LC and is powered by a single 9V
battery. Thanks to the instrument’s auto power off feature, the
battery may last up to 50 hours when the backlight and laser
pointer are turned off.
CAUTION!
The IRT657 is a Class 3R laser product that emits less than 3mW
of radiation. Avoid looking directly at the laser pointer. U.S. law
prohibits pointing a laser beam at aircraft; doing so is punishable
by a fine of up to $10,000 and imprisonment.
4

KEY FEATURES
• Measurement range of -40° to 1076°F (-40° to 580°C)
• 12:1 distance-to-spot ( :S) ratio
• Emissivity fixed at 0.95
• Measurements accurate within ±3°F (2°C) or ±2% of reading
(whichever is greater) for readings above 32°F (0°C); within
±5°F (3°C) or ±2% of reading (whichever is greater) for
readings below 32°F (0°C)
• °F or °C unit selectable on front panel
• Large (1.6 in. diagonal) backlit LC
• Low (<30mA) power consumption when laser and backlight are
off; extends battery life
• Meets CE, RoHS and U.S. F A standards
CAUTION: Use of controls or adjustments or performance of
procedures other than those specified herein may result in
dangerous radiation exposure.
WHAT’S I THE BOX
The IRT657 comes in a blister pack along with a soft carrying
case, a 9V battery and this user’s manual.
PRODUCT OVERVIEW
Figure 1 shows all of the controls, indicators and physical features
of the IRT657. Figure 2 shows most of the icons and text that may
appear on the display. Familiarize yourself with the locations and
functions of these controls and the meanings of these display
icons before moving on to the setup and operating instructions.
5

Fig 1. The IRT657’s controls, indicators and physical features
6
AE
I
F
G
H
B
C
D
A. Laser Pointer
B. Infrared Sensor/Lens
C. Measurement Trigger
. Battery Compartment
E. Backlit Liquid-Crystal
isplay
F. Button (laser on or off)
G. Button
(backlight on or off)
H. °C/°F Button (temperature
unit selection)
I. Laser Identification/
Certification/Warning/Safety
Labels (on left side); see
below

Fig. 2. All possible display indications
A. Low battery
B. Measured temperature
C. Measurement in progress
. Laser on
E. Fahrenheit units selected
F. Celsius units selected
G. ata being held (for 7 seconds, max, after trigger is released)
SETUP I STRUCTIO S
INSTALLING THE BATTERY
Open the battery compartment (callout of Fig. 1) by pulling its
cover away from the grip. Then plug the 9V battery that comes
with the IRT657 into the wired socket inside the compartment.
The terminals of the battery and the socket mate in only one way,
with the smaller male terminal plugging into the larger female
terminal. Close the battery compartment by snapping it shut.
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A
B
C
D
E
F
G

OPERATI G I STRUCTIO S
To make a quick temperature measurement, squeeze the
measurement trigger on the front of the grip and hold it for at
least one second while pointing the laser at the target. Note that
the SCAN icon appears along with the measured temperature
while you are squeezing the trigger. When you release the trigger,
the SCAN icon disappears and is replaced by the HOLD icon for
no more than seven seconds. After seven seconds, the IRT657’s
auto power off function kicks in and shuts off the thermometer to
prevent battery discharge.
The IRT657 will not make accurate measurements if there is glass
or plastic between the thermometer and the target.
To change the IRT657’s default measurement unit from
degrees Celsius (°C) to degrees Fahrenheit (°F), press the °C/°F
button below the display at right to make the icon °F appear on
the right side of the display. To return to Celsius units, press the
°C/°F button again.
To turn off the backlight, press the button (callout G of
Fig. 1) below the display at left.
To turn off the laser pointer, press the button (callout F of
Fig. 1) below the center of the display.
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Fig. 3. The IRT657’s thermometer’s field of view
HOW TO MAKE ACCURATE IR
MEASUREME TS
The IRT657 has a distance-to-spot ( :S) ratio of 12:1. This
means that the target area (spot) whose infrared radiation
(temperature) is being measured increases in diameter by
1 inch for every 12 inches you move away from the target.
Conversely, the diameter of the target area measured
decreases by 1 inch for every 12 inches you move closer
to the target.
All IR thermometers (IRTs), including the IRT657, take the
average temperature of all objects within a circular target
area (spot). Although the distance “ ” in the :S ratio is
defined as a linear value and the “S” defines the diameter
of the spot (see Fig. 3), the critical parameter is the target
area. epending on the distance to the target (the object
whose temperature you want to measure), the target area
may include both the target and background objects near or
behind the thermometer’s field of view, which defines the
target area or spot.
9
S
inches
mm
D
D:S=12:1

To explain the relationship between :S ratio and
measurement accuracy, consider how the IRT657 would be
used to measure the temperature of a small AC motor
suspected of overheating. The motor measures
approximately 1 ft x 1 ft, so it has an area of 1 ft2. If the
IRT657 is used to make the measurement from 24 ft.
away, the reading will have a large error. At this distance,
the target area is 2 ft2. Therefore, the IRT657 will measure
not just the temperature of the motor, but also the
temperature of the physical surroundings in its field of
view, and average the two readings.
How inaccurate would the measurement be? If the motor’s
operating temperature is 200°F and the background
temperature is 75°F, and the motor’s area is half the target
area at the measurement distance, the following equation
gives the average temperature of the target area:
Tavg = (Tmotor + Tbackground) ÷ 2
Solving for Tavg, we get (200 + 75) ÷ 2 or 137.5°F., which
is what the IRT657 would display. In other words, trying to
measure the temperature of the motor from 24 ft. away
introduced an error of (200-137.5) ÷ 200, or 31% into the
measurement. In this case, the measured temperature was
31% below the motor’s actual temperature because the
background is cooler than the motor.
To eliminate measurement error, the IRT must be moved
close enough so the motor is the only object in the target
area (see Fig. 4). For a motor with an area of 1 ft2and
using an IRT with a :S ratio of 12:1, the optimum
measurement distance would be 12 ft.
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