Omega Thermometer OS643 User Manual

OMEGA  
OS643  
Infrared Thermometer  
 
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.  
1
 
CAUTION  
Do not use the unit near any device which generates strong electromagnetic radiation  
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  
from hand.  
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.  
2
 
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 (0°C to 50°C) at < 70% relative  
humidity.  
Storage Temperature: 40°F to 140°F (-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 (Back-Light not illuminated).  
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).  
Weight: 160g including batteries.  
3
 
ELECTRICAL  
Temperature Range: 0°F to 500°F / -20°C to 260°C.  
Display Resolution: 1°F / 1°C.  
Accuracy: ±3% 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: Pre-set 0.95.  
Analog Output: 1mV/°F(°C).  
Detection Element: Thermopile.  
Optical Lens: Fresnal Lens.  
Field of View: 65mmØ at 1000mm.  
4
 
Spot size increases with distance from the probe tip as shown  
5
 
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  
Depress 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 turns off automatically after 15 seconds.  
6
 
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 "°F/°C" button to select °F or °C the Temperature Range.  
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% 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.  
7. Read the diaplay.  
7
 
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 (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).  
8
 
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.  
9
 
MAINTENANCE  
Battery Replacement  
Powerissuppliedbyfour1.5V(AAAsize)batteries. The" "appearsontheLCD  
display when replacement is needed.To replace the batteries, remove the screw  
from the back of the meter and lift off the battery cover case. Remove the  
batteries from battery contacts.  
Cleaning  
Periodically wipe the case with a damp cloth and detergent, do not use abrasives  
or solvents.  
10  
 
Substance  
Thermal  
emissivity  
Substance  
Thermal  
emissivity  
Asphalt  
Concrete  
Cement  
Sand  
0.90 to 0.98  
0.94  
0.96  
Cloth (black)  
Human skin  
Lather  
0.98  
0.98  
0.75 to 0.80  
0.90  
Charcoal (powder) 0.96  
Earth  
Water  
Ice  
Snow  
0.92 to 0.96  
0.92 to 0.96  
0.96 to 0.98  
0.83  
0.90 to 0.95  
0.90 to 0.94  
0.94  
0.80 to 0.90  
0.89 to 0.91  
0.93 to 0.96  
Lacquer  
0.80 to 0.95  
0.97  
0.94  
0.85 to 0.95  
0.90  
Lacquer (matt)  
Rubber (black)  
Plastic  
Timber  
Paper  
Glass  
Ceramic  
Marble  
Plaster  
Mortar  
Brick (red)  
0.70 to 0.94  
chromium oxides 0.81  
Copper oxides  
lron oxides  
Textiles  
0.78  
0.78 to 0.82  
0.90  
11  
 
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;  
improper specification;misapplication;misuse or other operating conditions outside of OMEGA'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.neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages  
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.  
 
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is  
constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE  
mark to every appropriate device upon certification.  
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no  
liability for any errors it contains, and reserves the right to alter specifications without notice.  
WARNING: These products are not designed for use in, and should not be used for, patient connected application.  
RETURN REQUESTS / INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.BEFORE RETURNING  
ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM  
OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned  
AR number should then be marked on the outside of the return package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in  
transit.  
FOR WARRANTY RETURNS, please have the following FOR NON-WARRANTY REPAIRS, consult OMEGA for  
information available BEFORE contacting OMEGA:  
1. P.O. number under which the product was  
PURCHASED.  
2. Model and serial number of the product under  
warranty, and  
current repair charges. Have the following information  
available BEFORE contacting OMEGA:  
1. P.O. number to cover the COST of the repair.  
2. Model and serial number of product , and  
3. Repair instructions and/or specific problems relative  
to the product.  
3. Repair instructions and/or specific problems relative  
to the product.  
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This  
affords our customers the latest in technology and engineering. OMEGA is a registered trademark of OMEGA  
ENGINEERING, INC. © Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not  
be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable from, in  
whole or in part, without prior written consent of OMEGA ENGINEERING, INC.  
 
Whe re Do I Find Eve rything I Ne e d for  
Proc e ss Me a sure m e nt a nd Control?  
OMEGA...Of Course !  
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Oxygen Instruments  
M-2983/0799  
 

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