Sentry ST 653 Instruction Manual

Gun-Type Professional
Infrared Thermometer

MODEL: ST 653

Instruction

Manual

Gun-Type Professional
Infrared Thermometer

Instruction

Manual

Table Content

1.Product Introduction

1-1 Features

1-2 Applications

2.Safety Information

2-1 Cautions

2-2 Safety symbols

3.Specifications

4.Operation Instructions

4-1 Quick Start

4-2

Unit Diagram

4-3 C/ F and Battery Change

4-4

Advance Function

5.Techniques of Infrared Thermometer

5-1 Field of view(FOV) ratio

5-2 Emissivity

6.Maintenance

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2
2

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4

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8

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Gun-Type Professional Infrared Thermometer

1.Product Introduction

Thank you for purchasing this infrared thermometer.
The Infrared Thermometer is a non-contact infrared
temperature measuring instrument. To measure a
temperature, point the unit at the object until the
temperature is read, pull the measuring trigger and
hold.Make sure the target area is larger than the unit's
spot size. For large target objects assure you are within
target distance.

1-1 Features

Adjustable emissivity from 0.1 to 1.00 in 0.01 steps.
Ultra low power consumption in shutdown mode.
Extended long time measuring reliability.
Laser sighting On/Off is switchable.
Backlit LCD display.

C or F selectable.
Electronic trigger lock.
Temperature data storage.
Audible alarms

1-2 Applications

Electrical troubleshooting.
Automotive repair and maintenance.
Air conditioner.
Science experiment.
Manufacturing processes of semiconductor
technology.
Test terminals on circuits.
Food safety and processing.
Perform HVAC energy audits.

Gun-Type Professional Infrared Thermometer 1

2.Safety Information

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

Laser Warning Note!

Do not point laser directly at eye. Use

caution a round reflective surfaces. Keep out of
reach of children.

2-1 Cautions!

DO NOT submerge the unit in water.
This product is not designed for use in medical
evaluations. The product can only be used to
measure body temperature simply for reference.
They are meant for industrial and scientific
purposes.

2-2 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 80­1000MHz with the instrument in three orientations. The
average error for the three orientations is 0.5 C ( 1.0 F) at
3V/m throughout the spectrum. However, between 781­1000MHz at 3V/m, the instrument may not meet its stated
accuracy.

2 Gun-Type Professional Infrared Thermometer

oo

3.Specifications

Distance/Spot Ratio

Temperature Range

Accuracy
(Assumes Operation
Ambient Temperature
of 25 C/77 F)

Spectral Response

Repeatability

Resolution

Response Time

Operation Temp.

Auto Power Off

Emissivity

/ Switchable

Backlight

Laser Sight Switchable
Max/Min/Avg./ T

Auto-measuring
10 point memory
Audio Alarm

Battery Type

Battery Life

Dimensions

Weight

Accessory

12:1

-32~535 (-25~999 )

3C( 5F)
From -32~-20 C(-25~-4 F)

2C( 3F)
From -20~100 C(-4~212 F)

2% From
100~535 C(212~999 F)

5~14 m
1 C ( 2 F)

0.1 C (0.1 F)
500 ms.

0~50 C(32~122 F),10~90%RH
Automatically after approx. 6s.

Adj. 0.1~1.0

YES

YES
YES

YES

YES
YES
YES

9V(006P, IEC6F22, NEDA1604)

16 hrs.

170x133x45mm
(6.69"x5.23"x1.77")

187g Approx.

9V Battery, Instruction manual,
Carrying case.

Gun-Type Professional Infrared Thermometer 3

4.Operation of Instrument

4-1 Quick Start

To measure a temperature, point the unit at the
target you want to measure, pull the trigger and
hold. In SCAN mode, the LCD displays 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 inside the angle of vision of this instrument.
The laser is used for aiming only. For small
targets at short distances the aim should be
adjusted respectively.

4-2 Unit Diagram

Display Screen

Laser Sighting

Measuring Window

Measuring Trigger

Battery and cover

4 Gun-Type Professional Infrared Thermometer

LCD Display

Scan/Hold/Auto

mode indication

Laser on/off

indication

Data

Max/Min/Ave/ T

indication

Emissivity/High alarm/

Low alarm adjustment

indication

Data Memory indication

C/ F unit indication

Temperature indication

Low battery

Up value button

Down value button

Function button

4-3 C/ F and Battery Change

The unit is powered by 9V
battery and displays
temperatures in either C
or F. 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 open the unit's handle
under the trigger. After
replacing the battery push
back and snap in place.

Gun-Type Professional Infrared Thermometer 5

C/ F

Switchable

Laser on/off

9V Battery

c

ON

OF

F

4-4 Advance Function

To configure advance functions, simply use the
"F" button to set parameters. The sequential
operations and the corresponding explanations
are shown in the following flow-chart.

Scan and display the
temperature during

SCAN

AUTO

Data Mode

DATA

MAX

MIN

AVG .

T

Parameter Setup mode

measurement.

Continuously measure and
display the temperature
without pulling the trigger.

Activate the data record
function when pull the trigger
and recall the stored data by
using or button.

(Note: While triggering to
record, the new data will
replace the existing data on
the next storage space!)

The maximum temperature
during one measurement.

The minimum temperature
during one measurement.

The average temperature
during one measurement.

The temperature differential
during one measurement.

EMS

HAL

LAL

Adjustable emissivity for
better accuracy on all surfaces.

Highest alarm temperature
setting.

Lowest alarm temperature
setting.

( *The parameters are adjusted
by using or buttons.)

6 Gun-Type Professional Infrared Thermometer

5.Techniques Of Infrared
Thermometer

5-1 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 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.

78@1000

mm

inch

34@250

1.4@10

48@500

1.9@20

D

S

3.1@40

D:S=12:1

7 Gun-Type Professional Infrared Thermometer

5-2 Emissivity

Emissivity is the ability of an object to emit 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
ratio of the energy radiated by an object at given
temperature to the energy emitted by a perfect
radiator at the same temperature. All values of
emissivity fall between 0.1 and 1.0.

(PS. Please refer to the chart next page.)

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 high, although in
some cases is comparable to contact devices.

6.Maintenance

Cleaning the lens: Blow off loose particles using
clean compressed air. Gently brush remaining
debris away with a camels 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.

Gun-Type Professional Infrared Thermometer 8

Material
Gold(pure highly polished) 227/440 0.02
Aluminum foil
Aluminum disc 27/81 0.18
Aluminum household(flat) 23/73
Aluminum (polisned prate 98.3%) 227/400

Aluminum(rough plate) 26/78
Aluminum(oxidized @599 C) 199/390

Aluminum surfaced roofing 38/100
Tin(bright tinned iron sheet) 25/77
Nickel wire 187/368
Lead(pure 99.95-unoxidized) 127/260
Copper 199/390

Steel 199/390

Zinc galvanized sheet iron(bright)
Brass(highly polished): 247/476
Brass(hard rolled-polished w/lines): 21/70
Iron galvanized(bright) -
Iron plate(completely) 20/68
Rolled sheet steel 21/71
Oxidized iron 100/212
Wrought iron 21/70
Molten iron 1299-1399/3270-2550
Copper(polished) 21-117/70-242
Copper(scraped shiny not mirrored) 22/72
Copper(Plate heavily oxidized) 25/77

Enamel(white fused on iron) 19/66
Formica 27/81
Frozen soil ­Brick(red-rough) 21/70
Brick(silica-unglazed rough) 1000/1832
Carbon(T-carbon 0.9% ash) 127/260
Concrete ­Glass(smooth) 22/72
Granite(polished) 21/70
Ice 0/32
Marble(light gray polished) 22/72
Asbestos board 23/74
Asbestos paper 38/100

Asphalt(paving) 4/39

Temp C/F Emissivity

27/81 0.04

0.01

0.04

577/1070

599/1110

599/1110

599/1110
28/82

371/700

0.06

0.06

0.11

0.19

0.22

0.04

0.1

0.06

0.18

0.19

0.52

0.57

0.23

0.03

0.04

0.13

0.69

0.66

0.74

0.94

0.29

0.02

0.07

0.78

0.9

0.94

0.93

0.93

0.8

0.81

0.94

0.94

0.85

0.97

0.93

0.96

0.93

0.95

0.97

9 Gun-Type Professional Infrared Thermometer