Omega OS643-LS User manual

OS643E-LS/OS643E
Infrared Thermometer
With Laser Sighting
OMEGA

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omega.com
TM

1
INTRODUCTION
This instrument is a portable easy to use 3 digit, compact-sized digital infrared
thermometer with laser sighting designed for simple one hand operation. Meter
comes with Backlit LCD display, Auto-hold function and auto power down (20
seconds approx.) after releasing MEAS button to extend battery life.
SAFETY INFORMATION
It is recommended that you read the safety and operation instructions before
using the infrared thermometer.
The symbol on the instrument indicates that the operator must refer to an
explanation in this manual.
DANGER
Pressingthe buttonturnsthelaserbeamonandoff.Exerciseextremecareanddonot
allow the laser beam to enter your eye or those of any other person or animal.
• Do not look directly into the laser light from the optical system.
• Whenmeasuringthetemperatureofanobjectwhichhasamirrorfinish,becarefulnot
to allow the laser light beam to be reflected off the surface into your eyes or those of
anotherperson.
• Do not allow the laser light beam to impinge upon any gas which can explode.

2
CAUTION
• Donotusethe unitnearanydevicewhichgeneratesstrongelectromagneticradiation
or near a static electrical charge, as these may cause errors.
• Donot usethe unitwhere itmay beexposed tocorrosive orexplosive gases.The unit
may be damaged, or explosion may occur.
• Do not keep or use this unit in an environment where it will be directly illuminated by
sunshine, or where it will be exposed to high temperatures, high humidity or conden-
sation.Ifyoudo,itmaybedeformed,itsinsulationmaybedamaged,oritmaynolonger
function according to specification.
• Donotpointthelensatthesunoratanyothersourceofstronglight.Ifyou do,thesensor
may be damaged.
• Donotcontactthelensagainsttheobjectwhosetemperatureistobemeasured,orget
it dirty, allow it to be scratched, or allow any foreign material to adhere to it. Doing so
may cause errors.
• Do not touch or hold by the front cone. Temperature reading can be affected by heat
fromhand.
• Do not place the meter on or around hot objects (70°C/158°F). It may cause damage
to the case.
• Ifthemeterisexposedtosignificantchangesinambienttemperature(hottocoldorcold
to hot). Allow 20 minutes for temperature stabilization, before taking measurement.
• Condensationmayformonthelenswhengoingfromacoldtohotenvironment-wait10
minutes for conden sation to dissipate before taking measurements.
• Thisunitisnotconstructedtobewaterproofordustproof,sodonotuseitinaverydusty
environment or in one where it will get wet.

3
SPECIFICATIONS
GENERAL
Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999.
Low battery indication: the " " is displayed when the battery voltage drops
below the operating level.
Measurement rate: 1 times per second, nominal.
Operating Environment: 32°F to 122°F (0°C to 50°C) at < 70% relative
humidity.
StorageTemperature:40°Fto140°F(-20°Cto60°C),0to80%R.H.withbattery
removed from meter.
Auto power off: 20 seconds.
Standby consuming current: <9mA.
Battery: 4 pcs 1.5V (AAA size).
Battery Life: 30 hours (continuity) typical (Laser marker and Back-Light not
illuminated).
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).
Weight: 160g including batteries.

4
Laser Specifications
Laser safety classification of Class II
Wave Lenght: Red (650nm).
Operating Distance: 2 to 50 feet.
Power out: <1mW , class II laser product.
ELECTRICAL
Temperature Range: -4°F to 1022°F / -20°C to 550°C.
Display Resolution: 1°F / 1°C.
Accuracy: ±2% of reading or ±6°F/3°C, whichever is greater @ 64.4 to 82.4°F
(@ 18 to 28°C) ambient operating temperature.
Temperature Coefficient: ±0.2% of reading or ±0.36°F/0.2°C, whichever is
greater, change in accuracy per °F/°C change in ambient operating tempera-
ture above 82.4°F/28°C or below 64.4°F/18°C.
Response Time: 1 second.
Spectral Response: 6 to 14µm nominal.
Emissivity: 0.10 to 1.00 by step of 0.01.
Detection Element: Thermopile.
Optical Lens: Fresnel Lens.
Sighting: 1-beam laser marker <1mW (class 2).
Field of View: 65mmØ at 1000mm (2.56"Ø at 39.37").

5
Spot size increases with distance from the probe tip as shown
(Spot Diameter measured at 90 % Energy)
CAUTION: Use of controls or Adjustments
or performance of Procedures other than
those Specified herein may result in
Hazardous radiation exposure.
Aperture Label (on front):
Danger, Certification & ID Label:
(Located on back of unit)

6
OPERATING INSTRUCTIONS
Auto Power-down function
If unused for about 20 seconds, the unit will power-down automatically. Press
MEAS button resumes power-on mode. SET MODE disables auto power-down
feature.
Turning the Power on
When the power is down, press MEAS button to turn on the meter.
The values and settings on the LCD return to what they were before the power
was last turned off.
NOTE: If,fromthepowerdowncondition,theMEASbuttonishelddownformore
than four second, measurement starts.
Display Back-Light Button
Press " " button to turn on or off the LCD Back-Light during measurement, or
while the display shows HOLD, MAX or MIN.

7
Laser Sighting
Press" "buttontoonthe" "annunciator.If" "annunciatorison,pressMEAS
button and the laser beam will turn on and " " annunciator will blink. Releasing
MEAS button turns off the laser beam.
MEAS (MEASURE) Button
Press MEAS button to turn on the meter for measuring temperature. Releasing
MEAS button to stop measuring temperature and automatically hold the display
reading, the meter power down automatically after 20 seconds.
Selecting the Temperature Scale
ReadingsaredisplayedineitherdegreesCelsius(°C)ordegreesFahrenheit(°F).
When the thermometer is turned on, it is set to the temperature scale that was
in use when the thermometer was last turned off. To change the temperature
scale, in power down mode hold the " " button (°F) [" " button (°C)] down, and
then press MEAS button until the °F (°C) annunciator appear.

8
Continuous Measurement
1. In the power down mode, holding the MODE key down and then pressing the
MEAS key will put the unit into the continuous measurement mode.
2. When the MEAS key is pressed again to stop measuring temperature and
automatically hold the display reading, the meter power down automatically
after 20 seconds.
NOTE: During the continuous measurement mode, the HOLD indication does
not appear.
NOTE: During the continuous measurement mode, the laser sighting is not
turned on.

9
MODE SELECTION AND OPERATION
Press MODE button switches the mode around the cycle
e®ALM Hi ®ALM Lo ®MAX ®MIN ®HOLD.
HOLD :Releasing MEAS button stops measuring temperature, the HOLD
indication appears, and the measured temperature is held.
e:The thermal emissivity of the object set using the ▲and ▼keys.
ALM Hi :The upper limit alarm temperature is set using the ▲and ▼keys.
When the measured temperature is exceeded the Hi setpoint, the
beeper emits a discontinuous pulse tone and "ALM Hi" is displayed.
ALM Lo :Thelowerlimitalarmtemperatureissetusingthe▲and▼keys.When
the measured temperature is blew the Lo setpoint, the beeper emits
a continuous pulse tone and "ALM Lo" is displayed.
MAX :The maximum temperature during measurement is displayed. when
measuring and also pressing the mode key, this will enter MAX/MIN/
Present cycling.
MIN :The minimum temperature during measurement is displayed. when
measuringand also pressing the mode key, this will enter MAX/MIN/
Present cycling.

10
NOTE: If, from the power down condition, the MEAS key is held down for more
than four second, MAX/MIN record starts.
SET MODE & Numeric input key
"SET" annunciator appears when a numerical value can be set (during setting of
e, ALM Hi and ALM Lo).
▲key :The numerical value is increased.
▼key :The numerical value is reduced.
Ifeitherofthesenumericalvaluekeysishelddown,thenumericalvaluechanges
rapidly in the appropriate direction.
The data will store in nonvolatile storage region while after settings completing.
In the this mode the automatic power-off feature is disabled.

11
How to specify the thermal emissivity ( ee
ee
e)
1. Stick black body tape on the object whose temperature is to be measured, or
spray it with black body spray.
2. Set the thermal emissivity value (e) on the LCD to 0.95.
3. Press the MEAS key, so as to measure the temperature (Treal) of the part on
which body tape (or black body spray) is applied.
4. Measure the temperature (T) of the parts to which body tape (or black body
spray) is not applied.
5. Change the thermal emissivity value (e).
6.The valueofthe thermalemissivity(e)atwhichTcomes outto beequaltoTreal
is the correct value for the inherent thermal emissivity of the body whose
temperature is to be measured.

12
OPERATION
1. When the power is down, pressing MEAS button turns on the power.
2. Use " " button to select turn on or turn off the display Back-Light.
3. Use " " button to select turn on or turn off the Laser beam.
4. Press the MODE button, if necessary to set the thermal emissivity value (e).
5. Point the lens at the object whose temperature is to be measured.
6. Press the MEAS button. Measurement is performed as long as the MEAS
button is kept pressed.
7. Referring to the spot size figure, aim the laser beam at the object whose
temperature is to be measured.
NOTE: Although the field of measurement (or Field of View) and the spot
almost coincide, actually the field of measurement corresponds to the
diameter for 90% optical response. The object whose temperature is
to be measured needs to be larger than the measurement diameter
(spot of size) by an adequate margin at least 1.5 to 2 times larger.
8. Read the display.

13
MEASUREMENT CONSIDERATIONS
1. Theory of Measurement
Every object emits infrared energy in accordance with its temperature. By
measuring the amount of this radiant energy, it is possible to determine the
temperature of the emitting object.
2. About Infrared
Infrared radiation is a form of light (electromagnetic radiation), and has the
property that it passes easily through air while it is easily absorbed by solid
matter. With an emission thermometer which operates by detecting infrared
radiation accurate measurement is possible, irrespective of the air tempera-
ture or the measurement distance.
3. Emission Thermometer Structure
Infrared radiation which has been emitted from the object is focused upon an
infrared radiation sensor, via an optical system. This includes a lens which is
transparenttoinfraredradiation,and5.3µmcutofffilter.Theoutputsignalfrom
the infrared radiation sensor is input to an electronic circuit along with the
output signal from a standard temperature sensor (Thermopile).

14
4. Emissivity
All objects emit invisible infrared energy. The amount of energy emitted is
proportional to the object's temperature and its ability to emit IR energy. This
ability, called emissivity, is based upon the material that the object is made of
and its surface finish. Emissivity values range from 0.10 for a very reflective
object to 1.00 for a black body. Factory set emissivity value of 0.95, which
cover 90% of typical applications.
5. If the surface to the measured is covered by frost or other material, clean it to
expose the surface.
6. If the surface to be measured is highly reflective, apply masking tape or matt
finish black paint to the surface.
7. If the meter seems to be giving incorrect readings check the front cone. There
may be condensation or debris obstructing the sensor; clean per instructions
in the maintenance section.

15
MAINTENANCE
Battery Replacement
Powerissuppliedbyfour1.5V(AAAsize)batteries.The" "appearsontheLCD
displaywhenreplacementisneeded.Toreplacethebatteries,removethescrew
from the back of the meter and lift off the battery cover case. Remove the
batteries from battery contacts.
Cleaning
Periodicallywipethecasewitha dampcloth anddetergent,donotuseabrasives
or solvents.

16
Substance Thermal Substance Thermal
emissivity emissivity
Asphalt 0.90to0.98 Cloth(black) 0.98
Concrete 0.94 Humanskin 0.98
Cement 0.96 Lather 0.75to0.80
Sand 0.90 Charcoal(powder) 0.96
Earth 0.92to0.96 Lacquer 0.80 to 0.95
Water 0.92to0.96 Lacquer(matt) 0.97
Ice 0.96to0.98 Rubber(black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.90to0.95 Timber 0.90
Ceramic 0.90to0.94 Paper 0.70 to 0.94
Marble 0.94
chromiumoxides 0.81
Plaster 0.80to0.90 Copperoxides 0.78
Mortar 0.89to0.91 lronoxides 0.78to0.82
Brick(red) 0.93to0.96 Textiles 0.90

WARRANTY
OMEGA warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a
period of 13 months from date of purchase.OMEGA Warranty adds an additional one (1) month grace period to the
normal one (1) year product warranty to cover handling and shipping time.This ensures that OMEGA's customers
receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for
evaluation. OMEGA's Customer Service Department will issue an Authorized Return (AR) number immediately
upon phone or written request.Upon examination by OMEGA, if the unit is found to be defective it will be repaired or
replaced at no charge.However, this WARRANTY is VOID if the unit shows evidence of having been tampered with
or shows evidence of being damaged as a result of excessive corrosion; or current, heat moisture or vibration;
improperspecification;misapplication;misuse orother operatingconditionsoutside ofOMEGA's control.Components
which wear or which are damaged by misuse are not warranted.This includes contact points, fuses, and triacs.
OMEGA is glad to offer suggestions on the of use of its various products.Nevertheless, OMEGA only warrants
that the parts manufactured by it will be as specified and free of defects
OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
DISCLAIMED.
LIMITATION OF LIABILITY:The remedies of purchaser set forth herein are exclusive and the total liability of
OMEGA with respect to this order, whether based on contract warranty, negligence, indemnification, strict
liability or otherwise, shall not exceed the purchase price of the component upon which liability is based.In
no event shall OMEGA be liable for consequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation of this manual;however, OMEGA ENGINEERING,
INC.neitherassumes responsibilityforany omissionsorerrors thatmayappear norassumes liabilityforanydamages
that result from the use of the products in accordance with the information contained in the manual.
SPECIAL CONDITION: Should this equipment be used in or with any nuclear installation or activity, purchaser will
indemnity OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
equipment in such a manner.