General IRT657 Manuel utilisateur

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 781-665-1400

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

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

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.

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.

Fig 1. The IRT657’s controls, indicators and physical features

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.

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.

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.

inches

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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