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J-35
Common Surface OS590
Conventional IR “Point and Shoot”
Temperature Series IR Guns and Probes Including Conventional Contact Probes,
Reason # Measurement Errors Thermometers Laser-Aimed Units Thermocouples, RTDs, Thermistors
1 Preset Emissivity Errors No effect Very sensitive No effect
2 Emissivity Shift Errors No effect Very sensitive No effect
3 User Adjustment Errors No effect Very sensitive No effect
4 Background Errors No effect Very sensitive No effect
5 Contact Errors No effect No effect Very sensitive
6 Friction Heating Errors No effect No effect Very sensitive
7 Heat Sinking Errors No effect No effect Very sensitive
8 Time-Based Errors No effect No effect Very sensitive
OS950 Series infrared scanners
from OMEGA
®
provide the highest
accuracy available anywhere!
They are very different from
conventional temperature
measuring devices. These scanners
are the only infrared instruments
with certified NIST-traceable
accuracy on real surfaces of
unknown emissivity, and they are
free of the contact errors and heat
errors of contact devices. Traceable
accuracy applies to surfaces with
an emissivity of 0.8 or higher.
Digital Infrared Scanners
High Accuracy, Certified NISTTraceability
Recessed cone traps all emitted
surface radiation and blocks out
any radiation from environment.
Only a thin lip of material
actually contacts the target,
thus minimizing heat transfer.
Actual measurement area is in the
center, well away from the area
contacted by the edge of the cone.
Reflective cone automatically
corrects for emissivity
variations by creating an
actual blackbody at the precise
location of measurement.
Figure 1. Unique Automatic Emissivity Compensation System (AECS) produces accurate temperatures
everywhere the infrared probe is placed by creating its own blackbody.
OS951 with integral
sensing head, $359,
shown smaller than
actual size.
8 Reasons the OS950 Handheld Infrared Scanners
from OMEGA are Superior to Conventional Devices:
Actual Emissivity
Conventional IR
Assumption
Temperature
550
500
450
400
350
300
1 0.8 0.6 0.4 0.2 0
290
200
150
Non-metals
and Oxides
Emissivity
Clean Metals
°F
Effect of Emissivity on Temperature Reading for a
260°C (500°F) Target in 21°C (70°F) Ambient
Conventional infrared
Figure 2. The OS950 Series is accurate over a wide
emissivity range, sufficient to include all non-metals.
If a marker (or any other non-metal coating) is used,
the OS950 Series is accurate on clean metals as well.
Conventional infrared devices are very inaccurate
on these surfaces.
°C
OS950 Series w/o marker
OS950 Series using marker
OS950 Series
Starts at
$
359
1. No Emissivity Errors
The true emissivity of a surface can never
be accurately determined by conventional
infrared devices. Without OMEGA’s
automatic emissivity compensation system
(see Figure 1 above), infrared devices with
a preset emissivity setting can only display
an approximate temperature over their
entire temperature range.
The accuracy specifications given by most
manufacturers are only for a “blackbody”
calibration and do not hold outside
laboratory conditions. Blackbody
calibrations totally ignore emissivity shifts,
ambient change effects on the target, and
other phenomena. Only OMEGA’s
OS950 Series is unaffected by these
distortions (see Figure 2 above).
2. No Emissivity Shift Errors
Even if an infrared “gun” is set to the
correct emissivity to read a surface
accurately at a particular temperature, it
may not read the same target correctly at
other temperatures. The emissivity of
virtually all surfaces changes with
temperature. For non-metals, the average
change in emissivity is approximately
-2% per 100°F target temperature change
(-3% per 100°C).
The sensing
surface area of the
OS950 scanners is
reflective to correct
for emissivity
variations.
Covered by U.S. and
International patents and
pending applications.
PATENTED
No points
SM
Extended Warranty
Program
Page 2
J-36
J
Specifications
Temperature Range:
OS951/2: -45 to 287°C (-50 to 550°F)
OS953/4: -18 to 540°C (0 to 1000°F)
OS955: 86 to 653°C (186 to 1207°F)
OS956: 86 to 871°C (186 to 1600°F)
Emissivity Adjustment:
Automatic emissivity compensation
system (best for emissivity above 0.8)
Accuracy: ±1% of reading or 2°C
Linearity Error (% of Reading):
OS951/2: 1%
OS953/4/5/6: 3%
Emissivity Error: -1% maximum of
difference between target temperature
and instrument temperature when
touching, for emissivity of 0.8 to 1.0
Repeatability: 0.1°C (-0.1°F)
Resolution: 0.1°C (0.1°F)
Response Time: Approx 0.1 s
Field of View: 1:1 (approx 53°)
Minimum Spot Size:
Approx 6.4 mm (0.25")
Spectral Response: 2 to 20 microns
Digital Output: RS232
(optional on all units)
°C/°F Conversion: Yes
Operating Temperature Range:
0 to 50°C (32 to 122°F)
Power: 9V battery (included)
Battery Life: Approx 5000 readings
Dimensions: 165 H x 51 W x 25 mm D
(6.5 x 2 x 1")
Weight: 198 g (7 oz)
High Accuracy = High Speed in Your Process!
To Order
(Specify Model Number)
Model No. Price Range Description
OS951 $359 -45 to 287°C (-50 to 550°F) Handheld IR scanner with integral sensor
OS952 619 -45 to 287°C (-50 to 550°F) Handheld IR scanner with integral sensor
OS953 879 -18 to 540°C (0 to 1000°F) Handheld IR scanner with integral sensor
OS954 1125 -18 to 540°C (0 to 1000°F) Handheld IR scanner with integral sensor
Options Price Description
-RS232 $50 RS232 digital output with 1.8 m (6') cable and 9-pin female connector
3. No User Adjustment Errors
A setting of emissivity = 0.9 on an infrared
“gun” from one manufacturer will not
necessarily match that on a different gun
from another manufacturer. No industrywide standards exist for the precise use of
emissivity in measurement. Therefore,
quality-assurance programs should not rely
on any instrument that allows users to alter
the instrument settings.
4. No Background Reflection Errors
Even if the emissivity were constant at all
temperatures (see reason 2, on page J-35),
errors could still occur depending on
changes in ambient temperatures. For
example, with emissivity = 0.9, ambient
reflections account for 10% of the signal
that the infrared gun will detect. If the
ambient temperature changes, the
infrared gun will display a different target
temperature, even if the target remains at
the same temperature (see Figure 3 below).
5. No Contact Errors
Thermocouples, RTDs, thermistors, and
other contact devices only measure their
own temperature, not the surface
temperature. When using such devices,
one must ensure that the probes are
brought to the same temperature as
the surface.
6. No Friction Heating Errors
For moving surfaces, a contact probe is
prone to friction heating errors. The size of
the error depends on the roughness of the
surface, the speed, the coating on the
probe, and so on. It is impossible
to control all the variables.
7. No Heat Sinking Errors
For most non-metals, heat sinking
errors can be quite large. The metal
leads of contact probes conduct heat
faster than the target material can replace
it, resulting in fairly sizable errors. In
general, the less thermally conductive the
target material, the larger the heat sinking
error with a contact probe.
8. No Time-Based Errors
Contact temperature probes are slow. The
temperature of a target can change more
quickly than most probes can measure,
causing errors in real-time measurement.
(see Figure 4 below)
OMEGACARESMextended warranty program
is available for models shown on this page.
Ask your sales representative for full details
when placing an order. OMEGACARE
SM
covers parts, labor and equivalent loaners.
0 20 40 60 80 100 120
43
38
32
Ambient T (°F)
Ambient T (°F)
Effect of Ambient Temperature (T) on Reading
for 38°C (100°F) Target with 0.8 Emissivity
4 16 27 38
110
106
102
98
94
90
Tar get T (°C)
Figure 3. OS950 Series scanners remain accurate even if the
ambient temperature varies, while conventional infrared devices
are considerably inaccurate.
OS950 Series
Conventional infrared
OS953 with integral sensing
head, $879, shown smaller
than actual size.
Comes complete with operator’s manual, 9 V battery and NIST certificate.
Ordering Examples: OS951-RS232, handheld infrared scanner with integral sensor,
-45 to 287°C (-50 to 550°F) range, and RS232 communications option, $359 + 50 = $409.
OCW-2, OMEGACARE
SM
extends standard 2-year warranty to a total of 4 years ($73),
409 + 73 = $482.
OS952, handheld infrared scanner with integral sensor, -45 to 287°C (-50 to 550°F) range, $619.
OS952 with remote
sensing head, $619,
shown smaller than
actual size.
0.001 0.01 0.1 1 10 100 1000
260
200
150
90
Time Comparison Between OS950 Series and Contact
Thermocouple for Measuring a 260°C (500°F) Surface
500
400
300
200
100
0
°C
Contact probes
OS950 Series
°F
Contact error
Time from Start of Measurement (s)
Figure 4. OS950 Series scanners measure surface
temperature in a fraction of a second, while contact probes
(thermocouples, RTDs, thermistors, etc.) require several minutes
to achieve equilibrium. In addition, contact probes always have a
residual error because of imperfect heat transfer from the surface
to the probe.
MOST POPULAR MODELS HIGHLIGHTED!
CAUTION!
is not intended for medical
use or use on humans
– This product
Page 3
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