Omega OS642F Manuel utilisateur
OMEGA
OS642F
Infrared Thermometer
OMEGAnetSM On-Line Service
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INTRODUCTION
This instrument is a portable easy use 3½ digit, compact-sized digital infrared
thermometer 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 and with analog signal output function.
SAFETY INFORMATION
It is recommended that you read the safety and operation instructions before
using the thermometer.
The symbol on the instrument indicates that the operator must refer to an
explanation in this manual.
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CAUTION
• Donotusetheunitnearanydevicewhichgeneratesstrongelectromagneticradiation
or near a static electrical charge, as these may cause errors.
• 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 befor 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: 32°F to 122°F at < 70% relative humidity.
Storage Temperature: -4°F to 140°F, 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 (Back-Light not illuminated).
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).
Weight: 5.47oz including batteries.
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ELECTRICAL
Temperature Range: 0°F to 500°F.
Display Resolution: 1°F.
Accuracy: ±3% of reading or ±5.5°F, whichever is greater @ 64.4 to 82.4°F
ambient operating temperature.
Temperature Coefficient: ±0.2% of reading or ±0.36°F, whichever is greater,
change in accuracy per °F change in ambient operating temperature above
82.4°F or below 64.4°F.
Response Time: 1 second.
Spectral Response: 6 to 14µm nominal.
Emissivity: Pre-set 0.95.
Analog Output: 1mV/°F.
Detection Element: Thermopile.
Optical Lens: Fresnal Lens.
Field of View: 2.56"Ø at 39.37".
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Spot size increases with distance from the probe tip as shown
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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.
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.
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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. Point the lens at the object whose temperature is to be measured.
4. Press the MEAS button. Measurement is performed as long as the MEAS
button is kept pressed.
5. Referring to the spot size figure, aim the infrared beam 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.
6. Read the diaplay.
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MEASUREMENT CONSIDERATIONS
1. Theory of Measurement
Every object emits infrared energy in accordance with its temperature. By
mesuring 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 (electromagnectic 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 rediation, 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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