User’s Guide
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OS950 SERIES
Handheld Infrared
Thermometers
Table of Contents
Chapter One - Welcome to Infrared Thermometry . . . .1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Product Features . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Models and Ordering Information . . . . . . . . . . .1
Chapter Two - Operation . . . . . . . . . . . . . . . . . . . . . . .2
2.1 OS950 Controls . . . . . . . . . . . . . . . . . . . . . . . .2
2.2 To Change Display Measurement Units . . . . . .2
2.3 To Change Mode of Operation . . . . . . . . . . . . .3
2.4 Temperature Measurements . . . . . . . . . . . . . . .3
2.4.1 General Operation . . . . . . . . . . . . . . . . .3
2.4.2 Temperature Measurement of
Moving Targets . . . . . . . . . . . . . . . . . .4
2.4.3 High Temperature Targets . . . . . . . . . . .4
2.5 MAX Mode Temperature Measurements . . . . . .4
2.5.1 General Operation . . . . . . . . . . . . . . . . .4
2.6 SCAN Mode Temperature Measurements . . . . .5
2.6.1 General Operation . . . . . . . . . . . . . . . . .5
Chapter Three - Measurement Tips . . . . . . . . . . . . . . . .5
3.1 Optimizing Target Area Measurements . . . . . . .5
3.2 Measuring Metallic Targets . . . . . . . . . . . . . . . .6
3.3 Optimizing AESC Measurements for
NIST Traceability . . . . . . . . . . . . . . . . . . . . . . .6
3.4 Measuring Transparent Materials . . . . . . . . . . .6
3.5 Measuring Wet or Icy Surfaces . . . . . . . . . . . . .6
Chapter Four - Maintentance . . . . . . . . . . . . . . . . . . . . .7
4.1 Battery Replacement . . . . . . . . . . . . . . . . . . . .7
4.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Chapter Five - Troubleshooting . . . . . . . . . . . . . . . . . . .7
5.1 Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . .7
5.2 Troubleshooting Measurement Difficulties . . . . .9
Chapter Six - OS950™ Specifications . . . . . . . . . . . . . .9
Chapter One - Welcome to Infrared
Thermometry
1.1 Introduction
Omega Engineering, the world's leading manufacturer of
infrared temperature systems, presents the low cost
OS950™ Series of hand held infrared thermometers.
These dual-purpose systems function as both NIST trace-
able temperature calibrators and thermal scanning devices.
Make fast, accurate, and reliable temperature measure-
ments using advanced non-contact IR technology.
Meet your company's product quality conformance needs
with the OS950's patented Automatic Emissivity
Compensation System (AECS). In this mode, the unit will
provide precision temperature measurements of spot tar-
gets, without knowing the target's emissivity value, and
without errors caused by other sources of incident radiation.
Since the OS950 is NIST traceable, it can function as a pri-
mary temperature calibrator for other temperature measur-
ing devices, serving your corporate quality instrument cali-
bration programs. Operate the OS950 in SCAN mode, for
thermal scanning measurements over a range of target
temperatures. Thermal Scanning is very useful in many
applications such as evaluating insulation, monitoring
machinery, and inspecting electrical equipment. Or the
OS950 may be operated in the MAX mode where the high-
est temperature measured while monitoring is presented.
This manual provides complete instructions on how to oper-
ate and use your OS950-- to provide fast, accurate, reliable
temperature measurements for your application needs.
1.2 Product Features
Designed for ease of use and measurement flexibility, the
OS950 features:
•
Dual purpose, AECS as well as MAX and SCAN
measurement modes
•
•
•
•
Measurement resolution to 0.1 °F or 0.1°C
Factory calibration for precise results
A 10 second display reading hold
Internal self test and error diagnostic codes to insure
proper function
1.3 Models and Ordering Information
OS950 -50 to 550°F (-45 to 287°C) Unit includes a 9 V
DC Alkaline Battery and OS950 Instruction
Manual. Also available with a Remote Sensor,
RS232 Digital Output and an Analog Output.
OS953 0 to 1000°F (-18 to 538°C) Unit includes a 9 V
DC Alkaline Battery and OS950 Instruction
Manual. Also available with a Remote Sensor,
RS232 Digital Output and an Analog Output.
OS955 0 to 1207°F (86 to 653°C) Unit includes a
Remote Sensor, 9 V DC Alkaline Battery and
OS950 Instruction Manual. Also available with
an RS232 Digital Output and an Analog Output.
1
OS956 0 to 1600°F (86 to 871°C) Unit includes a
Remote Sensor, 9 V DC Alkaline Battery and
OS950 Instruction Manual. Also available with
an RS232 Digital Output and an Analog Output.
Chapter Two - Operation
2.1 OS950 Controls
MEASUREMENT
button
LED Display
Sensor Window
AECS Cup
Battery Cover
Screw
LED Display
Displays target temperature and diag-
nostic codes
Measurement
button
To turn on and start temperature meas-
urement
Nosepiece
w/AECS cup
Automatic emissitivity compensation
system nosepiece to contact target
Sensor window Sensor viewing area for IR detector
2.2 To Change Display Measurement Units
The OS950 Models come from the factory displaying tem-
perature in units of Fahrenheit. To display readings in units
of Celsius, perform the following steps:
1. Remove the screw from the underside of the case.
2. Remove the cover, exposing the battery area.
3. Locate the push button switch as shown in the picture.
4. With the unit off (display is blank), push the push but-
ton in.
5. Holding the push button in, turn the unit on with the
MEASUREMENT button.
2
The instrument now reads in °C instead of °F. To return to
the original setting, simply repeat the process.
ºF/ºC Switch
MAX/SCAN Switch
2.3 To Change Mode of Operation
The OS950 Models come from the factory operating in the
MAX mode. To change to the SCAN mode perform the fol-
lowing steps:
1. Remove the screw from the underside of the case.
2. Remove the cover, exposing the battery area.
3. Locate the slide switch as shown in the picture.
4. Change the position of the slide switch from 1 to ON.
The unit will now operate in the SCAN mode. ON Î SCAN,
1 Î MAX.
2.4 Temperature Measurements
2.4.1 General Operation
CAUTION... SHOCK HAZARD
DO NOT TOUCH THE INSTRUMENT
TO ELECTRICAL CONDUCTORS*
The OS950™ measures temperature very quickly. To
obtain an accurate measurement, it is only necessary to
touch the surface for a fraction of a second.
For exact surface temperature measurements that are NIST
traceable, use the following procedure:
1. Press and hold the MEASURE button.
2. The display will briefly show [8888].
3. Touch the nosepiece to the target surface.
4. The display may or may not change, but the "beeping"
sound will indicate that measurements are being
made.
5. Record the temperature from the display.
6. Release the MEASURE button. The last reading will
remain locked on the display for 10 seconds after
releasing the button.
3
2.4.2 Temperature Measurement of Moving
Targets
To measure moving targets that are not possible to touch,
use the following procedure:
1. Press and hold the MEASURE button.
2. The display will briefly show [8888].
3. Bring the nosepiece as close as possible to the target,
preferably within 1/32 inch (1 mm). **
4. The display may or may not change, but the "beeping"
sound will indicate that measurements are being
made.
5. Record the temperature from the display.
6. Release the MEASURE button. The last reading will
remain locked on the display for 10 seconds after
releasing the button.
** If the surface is metallic, be sure to mark it as described
in the Measurement Tips section in Chapter Three.
2.4.3 High Temperature Targets
When using the OS950™ to measure high temperature tar-
gets, above 100 °F, quickly touch the target's surface -- one
second is long enough to get an accurate reading.
Follow the procedures described above under 2.4.1
General Operation (see pg. 5). If the OS950 makes contact
with a hot surface for an extended time (10 seconds or
more) the target will conduct heat. Although this will not
harm the unit, the indicated temperature may be a few
degrees too high. Allow a few minutes between readings
for the nosepiece to cool down and stabilize.
If the OS950 makes contact with a hot surface and an error
message [HI] shows on the display remove the instrument
from the object immediately.
2.5 MAX Mode Temperature Measurements
Use this measurement mode when making contact with the
target or when the target is large. The OS950 is a wide-
angle thermal scanner with a fixed emissivity of 0.9. The
target's temperature is continuously displayed and updated
10 times per second for as long as you hold the MEASURE
button down.
The OS950 displays the average temperature of everything
within the sensor's field of view measurement area. The
size of the measuring area depends on the distance of the
device from the target. The OS950 has a 1:1 field of view,
which means that this unit will measure a 1"diameter target
area when the device is 1" from the target.
2.5.1 General Operation
For continuous temperature measurement of a target or for
temperature measurement at a distance, use the following
procedure.
1. Determine the appropriate measurement distance from
your desired target. Best measurements are made
when the OS950 is in contact with the target.
2. Make sure the MODE switch is on MAX.
3. Point the nosepiece at the target.
4. Press and hold the MEASURE button.
4
5. Record the temperature from the display.
6. Release the MEASURE button. The last reading will
remain locked on the display for 10 seconds after
releasing the button.
2.6 SCAN Mode Temperature Measurements
Use this measurement mode for thermal scanning of a tar-
get or when measuring targets located at a distance. The
OS950 is a wide-angle thermal scanner with a fixed emis-
sivity of 0.9. The target's temperature is continuously dis-
played and updated 10 times per second for as long as you
hold the MEASURE button down.
The OS950 displays the average temperature of everything
within the sensor's field of view measurement area. The
size of the measuring area depends on the distance of the
device from the target. The OS950 has a 1:1 field of view,
which
means that this unit will measure a 1"diameter target area
when the device is 1" from the target.
2.6.1 General Operation
For continuous temperature measurement of a target or for
temperature measurement at a distance, use the following
procedure.
1. Determine the appropriate measurement distance from
your desired target.
2. Make sure the MODE switch is on SCAN.
3. Point the nosepiece at the target.
4. Press and hold the MEASURE button.
5. Record the temperature from the display.
6. Release the MEASURE button. The last reading will
remain locked on the display for 10 seconds after
releasing the button.
Chapter Three - Measurement Tips
3.1 Optimizing Target Area Measurements
When performing a continuous thermal scan of a target, or
measuring a target located at a distance, proper target
alignment will help assure accurate results. Since the
OS950's sensor measurement area is fixed at a field of
view of 1 to 1, it is important to properly determine the best
measuring distance from the target, to optimize the reading.
A field of view of 1 to 1 means that the OS950 viewing area
is 1" diameter for 1" distance from target. Optimize optical
alignment, so that the OS950 views only the target and
does not overlap the measurement area. See Figure below
for examples of proper optical alignment.
POOR
POOR
5
GOOD
3.2 Measuring Metallic Targets
In general, infrared thermometers can easily measure non-
metallic surfaces because they emit most of their potential
heat. Metallic surfaces, on the other hand, are poor emit-
ters and require special treatment before infrared ther-
mometers can accurately measure their temperature.
Fortunately, that special treatment is simple and can be
easily accomplished by marking the metallic surface you
wish to measure with a non-metallic substance such as a
solid paint marker. Other substances such as grease, oil,
or tape may also be used. It is only necessary to mark an
area slightly larger that the OS950 nosepiece, when operat-
ing in AECS mode. When operating in MAX or SCAN
modes, mark the appropriate target area for the measuring
distance from the target, based on a 1 to 1 Field of View.
3.3 Optimizing AESC Measurements for
NIST Traceablity
If you look at the OS950's nosepiece, you will see that it is
really a small reflective cup with the sensor's window at its
base. When the OS950's nosepiece touches the surface of
an object, that reflective cup automatically controls what the
sensor sees by eliminating variables such as target emis-
sivity and extraneous radiation. Patented by Exergen as
the Automatic Emissivity Compensation System (AECS),
this unique design ensures accurate readings every time.
To optimize results, make sure that the nosepiece is flush
with the target when possible, so that the reflective cone
can complete trap out any light or incident radiation from
the environment.
3.4 Measuring Transparent Materials
Although transparent materials pass visible light, many visi-
bly transparent materials are opaque in the infrared and
can be directly measured by the OS950.
To test for infrared transparency, touch the OS950 to the
target's surface and pass a heat source such as your hand
or a penlight through the sensor's field of view on the other
side of the material. If the OS950 responds to the heat
source, the material is transparent in the infrared, and
requires marking the surface for proper measurement.
Mark the surface with an opaque non-metallic coating, such
as paint or grease.
Alternatively, place a shiny metallic object, such as alu-
minum foil, behind the transparent material. The shiny
metal will reflect the target's heat back to the OS950.
3.5 Measuring Wet or Icy Surfaces
Wet or icy surfaces may interfere with the OS950's read-
ings. Water and other liquids are good targets, but evapo-
ration lowers their surface temperatures.
Frost forms on a surface at the freezing point of water.
Frozen foods or similar targets will form frost unless the
environment is controlled. If frost forms, the OS950 will
measure the temperature of the frost instead of the object's
temperature.
Melting ice will read slightly higher than 32 °F (0°C)
because the instrument actually measures the air condens-
ing on the ice, a reaction that generates a small amount of
6
heat. As long as the ice is not melting, the OS950 will
accurately read its temperature.
To make an accurate target measurement, remove any ice
or moisture before measuring.
Chapter Four - Maintenance
The high-performance OS950 is a rugged and durable
instrument, designed for long term performance reliability.
4.1 Battery Replacement
Open the instrument's cover to access the battery by loos-
ening the screw on the back of the instrument. Remove the
old battery and replace it with one fresh, 9 V alkaline bat-
tery. Align the battery contacts as indicated on the case.
4.2 Cleaning
The only maintenance required involves keeping the sensor
window clean. This window, located at the base of the
nosepiece's reflective cup, is made of a special crystal that
passes infrared heat. Dirt, greasy films, or moisture on the
window will interfere with the passage of infrared heat and
affect the accuracy of the instrument.
If necessary, clean the sensor window and reflective cup
with a cotton swab dipped in alcohol. Periodic cleaning is a
good practice.
4.3 Storage
When not in use, store the OS950 in a container, to protect
the unit from dirt and dust. Do not store the unit in areas of
extreme heat, cold, or humidity. If not using the OS950 for
a long period, remove the battery from the unit.
4.4 Calibration
The OS950 is factory calibrated under high quality stan-
dards. Because there are no mechanical adjustments, the
instrument is able to maintain its calibration through vibra-
tion and normal use. No field calibration is necessary.
Chapter Five - Troubleshooting
5.1 Diagnostic Codes
The high-performance OS950™ continuously monitors its
ability to produce accurate temperature readings. If either
the target's temperature or the unit's ambient temperature
exceeds the operational limits, the display will default to an
error message.
The battery voltage is also monitored. A low battery is indi-
cated by a separate error code. The unit will continue to
operate as long as accuracy can be assured. If the battery
drops below 5.7 volts, the battery is considered "dead" and
the display defaults to [----].
7
If the [E-##] or [Err] error messages are displayed, the unit
will not function and must be returned to the factory for
repair. (See section on Warranty for return instruction).
The following charts summarize the fault condition, and the
associated indication.
High Target Temperature
Condition
Error Measurement Remedy
Code Fault
Model OS951
Model OS953
Model OS955
Model OS956
[HI] Target >550°F Use higher
(287 °C)
[HI] Target >1000 Use higher
°F (538 °C) OS950
[HI] Target >1207 Use higher
°F (653 °C) OS950
[HI] Target >1600 Contact
°F (871 °C) Omega
OS950
Low Target Temperature
Condition
Error Measurement Remedy
Code Fault
Model OS951
Model OS953
Model OS955
Model OS956
[LO] Target < -50 °F Contact
(-45 °C)
[LO] Target <0 °F (- Use lower
18 °C) OS950
[LO] Target <186 °F Use lower
(86 °C) OS950
[LO] Target <186 °F Use OS951 or
(86 °C) OS953
Omega
Other Errors
Condition
Error Measurement Remedy
Code Fault
High Ambient [HI A] Ambient > 122 Move to
Temperature
°F (50 °C)
alternate
location
Low Ambient [LO A] Ambient < 32 Move to
Temperature
Low Battery
Dead Battery
°F (0 °C)
alternate
location
[N/A] Battery power Replace
low
battery
[----] Dead battery
Replace
battery
Processing
Error
[E-##] Internal fault
or [Err}
Repeat
measurement,
if error
remains,
contact
Omega
8
5.2 Troubleshooting Measurement
Difficulties
If you experience measurement problems, review the fol-
lowing troubleshooting steps:
Is the sensor window clean?
Clean the sensor window and reflective cup and repeat the
measurement.
Is the target's surface non-metallic?
Coat metallic surfaces with a non-metallic finish and repeat
the measurement.
Is the target's surface transparent?
Coat transparent surfaces with an opaque non-metallic fin-
ish and repeat the measurement.
Alternatively, put a shiny metallic surface such as aluminum
foil behind the transparent target and repeat the measure-
ment.
Was the instrument's nosepiece in contact with the surface?
Touch the nosepiece flush to the target's surface and repeat
the measurement.
If after applying all of the above solutions, the instrument's
accuracy is still in question, contact Omega for further help.
Chapter Six - OS950™ Specifications
Target Temperature Range
OS951 -50 to 550°F (-45 to 287°C)
OS953 0 to 1000°C (-18 to 538°C)
OS955 186 to 1207°F (86 to 653°C)
OS956 186 to 1600°F (86 to 871°C)
Linearity Error
OS951
OS953
OS955
OS956
± 1% of reading
±3% of reading
±3% of reading
±3% of reading
Emissivity Error
±1% of max. difference between target temperature and
instrument temperature when touching, for emissivity of 0.8
to 1.0
Minimum spot size diameter
Approx. 1/4" (6.4 mm)
Repeatability
± 0.1 °F/°C
NIST Traceablity
In AECS Mode
Display Resolution
0.1 °F or 0.1 °C
9
Display Update
10 times/second
Measurement Response Time
Approximately 0.1 seconds
Field of View
1:1 0.63" (15.9 mm) Diameter Spot Area in AECS Mode
Spectral Sensitivity
2 to 20 microns
Battery
One 9 volt
Battery Life
5000 readings (10 seconds each)
Instrument Ambient Temperature
Operating Range: 32 to 122°F (0 to 50°C)
Storage Range: -22 to 140°F (-30 to 60°C)*
*Extended storage at temperature extremes will reduce bat-
tery life.
10
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in
materials and workmanship for a period of 13 months from date of purchase.
OMEGA’s 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 malfunctions, 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. OMEGA’s WARRANTY does not apply to defects resulting from
any action of the purchaser, including but not limited to mishandling, improper
interfacing, operation outside of design limits, improper repair, or
unauthorized modification. This WARRANTY is VOID if the unit shows
evidence of having been tampered with or shows evidence of having been
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 are not
warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various
products. However, OMEGA neither assumes responsibility for any
omissions or errors nor assumes liability for any damages that result
from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only 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, EXPRESS 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.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor
shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in
or with any nuclear installation or activity; or (2) in medical applications or
used on humans. Should any Product(s) be used in or with any nuclear
installation or activity, medical application, used on humans, or misused in
any way, OMEGA assumes no responsibility as set forth in our basic
WARRANTY / DISCLAIMER language, and, additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage
whatsoever arising out of the use of the Product(s) in such a manner.
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,
FOR NON-WARRANTY REPAIRS,
please have the following information consult OMEGA for current repair
available BEFORE contacting
OMEGA:
1. Purchase Order number under
which the product was
PURCHASED,
charges. Have the following
information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover
the COST of the repair,
2. Model and serial number of the
product under warranty, and
2. Model and serial number of the
product, and
3. Repair instructions and/or specific 3. Repair instructions and/or specific
problems relative to the product.
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 2001 OMEGA ENGINEERING, INC. All rights reserved. This
document may not be copied, photocopied, reproduced, translated, or
reduced to any electronic medium or machine-readable form, in whole or in
part, without the prior written consent of
OMEGA ENGINEERING, INC.
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OMEGA…Of Course!
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M3744/0801
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