Omega OS642C-LS User manual
OMEGA
OS642C-LS
Infrared Thermometer
With Laser Marker
OMEGAnetSM On-Line Service
http://www.omega.com
Internet e-mail
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SM
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omega.com
TM
1
INTRODUCTION
This instrument is a portable easy use 3½ digit, compact-sized digital infrared
thermometer with laser marker designed for simple one hand operation. Meter
with Backlit LCD display, Auto-hold function and auto power off (15 seconds
approx.) feature 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
Pressing the button turns the laser marker on and off. Exercise extreme care and do
not 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
• Donotusetheunit nearanydevicewhichgeneratesstrongelectromagneticradiation
or near a static electrical charge, as these may cause errors.
• Donotusetheunitwhereitmaybeexposedtocorrosiveorexplosivegases.Theunit
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.
SPECIFICATIONS
GENERAL
Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999.
Overrange: (OL) or (-OL) is displayed.
Low battery indication: the " " is displayed when the battery voltage drops
below the operating level.
Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 50°C at < 70% relative humidity.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed from
meter.
Auto power off: 15 seconds approx.
Standby consume current: <1µA.
Battery: 4 pcs 1.5V (AAA size).
Battery Life: 100 hours (continuity) typical (Laser marker and Back-Light not
illuminated).
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).
Weight: 160g including batteries.
3
4
ELECTRICAL
Temperature Range: -20°C to 260°C.
Display Resolution: 1°C.
Accuracy: ±3% of reading or ±3°C, whichever is greater @ 18 to 28°C ambient
operating temperature.
Temperature Coefficient: ±0.2% of reading or ±0.2°C, whichever is greater,
change in accuracy per °C change in ambient operating temperature above
28°C or below 18°C.
Response Time: 1 second.
Spectral Response: 6 to 14µm nominal.
Emissivity: Pre-set 0.95.
Analog Output: 1mV/°C.
Detection Element: Thermopile.
Optical Lens: Fresnal Lens.
Sighting: 1-beam laser marker <1mW (class 2).
Field of View: 65mmØ at 1000mm.
5
Spot size increases with distance from the probe tip as shown
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
Push buttons
Display Back-Light Button
Release MEAS button then press " " button to toggle between turn on and turn
off the Back-Light. When releasing MEAS button Back-Light will turn off auto-
matically after 15 seconds to extend battery life.
Laser Marker Button
Release MEAS button then press " " button to toggle between turn on and turn
off the Laser Marker annunciator, If " " annunciator turn on, press MEAS button
the laser marker beam is being emitted, releasing MEAS button turn off the laser
marker beam.
MEAS (MEASURE) Button
DepressMEASbuttontoturnonthemeterformeasuringtemperature.Releasing
MEAS button to stop measuring temperature and automatically hold the display
reading, the meter turns off automatically after 15 seconds.
7
OPERATION
1. When the power is off, pressing the 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 Marker.
4. Point the lens at the object whose temperature is to be measured.
5. Press the MEAS button. Measurement is performed as long as the MEAS
button is kept pressed.
6. 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%opticalresponse.Theobjectwhosetemperatureistobemeasuredneeds
to be larger than the measurement diameter (spot of size) by an adequate
margin at least 1.5 to 2 times larger.
7. Read the diaplay.
8
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 (electrmagnectic 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 which includes a lens is
transparent to infrared radiation, an 5.3µm cut off filter. The output signal from
the infrared radiation sensor is input to an electronic circuit along with the
output signal from a standard tempeature sensor (Thermopile).
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