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| Common Surface Temperature Measurement Errors |
DX-Series IR Thermometers |
Conventional IR “Point and Shoot”
guns and probes, including laser aimed units |
Conventional
contact probes,
thermocouples,
RTDs,thermistors |
| Pre-set emissivity errors |
no effect |
Very sensitive |
no effect |
| Emissivity shift errors |
no effect |
Very sensitive |
no effect |
| User adhustment errors |
no effect |
Very sensitive |
no effect |
| Usaer adustment errors |
no effect |
Very sensitive |
no effect |
| Background errors |
no effect |
Very sensitive |
no effect |
| Contact errors |
no effect |
no effect |
Very sensitive |
| Friction heading errors |
no effect |
no effect |
Very sensitive |
| Heat sinking errors |
no effect |
no effect |
Very sensitive |
| Time- based errrs |
no effect |
no effect |
Very sensitive |
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ALL other IR Devices are traceable only to blackbodies. with the exception of the Exergen D Series.
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DX - Series Hand held Precision IR Thermometers
DX Infrared Scanners from Exergen provide
the Highest Accuracy available... anywhere ! |
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| The DX-Series is an entirely different type of instrument than conventional temperature measuring devices.
Designed specifically for the highest possible accuracy, it is the only infrared insturument which can be certified
with NIST - traceble accurracy on real surfaces of unknown emissivity. while remaining completely free of the contact
errors and heat sinking errors of contact devices. |
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| 8 reasons the DX Series of handheld infrared scanners
from Exergen are superior to conventional devices |
| No emissivity errors |
The true emissivity of a surface can never be accurately derermined
by conventional infrared devices. Without Exergen’s Automatic Emissivity
compensation system, IR devices with a pre-set emissivity setting can only
display an approximate temperature over their entire temprature range.
The accuracy specification given by most menufacuters are only for
a “blackbody” ealibration and do not hold outside laboratory conditions
. Blackbody ealibrations totally ignore emissivity shifts, ambient
change effects on the target, and other phenomenon. Only
Exergen’s DX Series is unaffected by these distortions.
 |
| No emissivity shift errors |
Evens if an IR “gun” is set to the correct emissivity to read a surface accurately at a particular
temperature. it does not mean that the gun will read the same target correctly at other
temperatures. Emissivity of virtually all surface changes with temperature. A common
assumption for conventional IR thermometry is that emisivity is constant wih changes in target
surface temperature. Real materials do not have this characteristic. The average value
for non-metals for which the change in emissivety with respect to surface temperature has
been reported is approximately -2% per 100 F target temperature change (-3% per 100 c).
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| High Accuracy : High Speed in Your Process |
| No user adjustment errors |
| A setting of emissivity =0.9 an IR “gun” from one manufacurer
will not necessarily match that of a different gun from another manufacturer
No industry-wide standards exist for the precise use of emissivity in measurement .
Therefore Quality Assurance programs should not rely upon any instrument that allow users
to alter the instrument setting and to let it display whatever ther user wishes. |
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| No background reflection errors |
| Even if emissivity were constant at all temperatures (see Reason 2),
there would still be errors induced by changing ambient temperatures. For
example,with emissivity = 0.9 ambient reflections account for 10% of the
signal that the IR gun will see. if the ambient temperature changes, the IR
gun will display a different target temperature, even if the target remains
at the same temperature . |
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| No contact errors |
| Thermocouples, RTDs, thermistors and other contact device only
measure their own temperature. They do not measure surface
temperature. published “Accuracy’ specifications are for the probes
only. not the surfaces they must measure. Users must guarantee that the probes
are brought to the same temperature as the surface. Can you gurantee that your
probes are brought to the same temperature as the targets to be measured ? |
| No friction heating errors |
| For moving surfaces. a contact probe is prone to frictinal heating.
The size of the errror is dependent on the probe,and so on . it is impossible to
control all the variables. |
| No heat sinking errors |
| For most non-metals heat sinking errors can be quite large. The
metal leads required on contact probes conduct heat faster than the target material can
replace it, resulting in unknown and fairly sizeable the larger the heat sinking error with a contact probe. |
| No time based errors |
| contjct temperature probes are slow. The temperature can change more quickly than most probes can measure, resulting in
errors in real time measurement (see Figure 4.) |
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| DX-Series Handheld Precision IR Thermometers |
| Here Are just a Few Examples of the Many
Real World Applications of the DX Scanner Series |
| The DX Thermometer is a necessary tool in any industry where accuracy in temperature measurement is required. particularly when the task speed or the
process speed is importan.t This instrument will satisfy the most exacting demands, assuring quality, reliability and safety |
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| IRt/c Installation |
Product Inspection |
Frozen Products |
Beverage Container |
| Reference source to a
temperature readout/ contriller device |
Validate product temperature without shutting down to line. |
Measure frozen targets
such as food.
phamaceutical and medical products. |
Use for inspection of food and beverages in the
processing. packaging. grocery and restaurant
industrial. |
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| NIST- Truceable Target |
Engine Block |
Electronic/Electrical |
Tire |
| A standard Calibration
temperature reference,
ISO certified |
Use for engine tuning and maintenance
in automotive and aerospace industries. |
Inspection of components, switches,
etc.for safety |
Inspect tire temperature in production line for
quality control. Also useful for driving Performance. |
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| Snow/Ice |
Water Pipe |
Rubber Roller |
Oven |
|
Use for road conditioning constructiion,ice
rink inspections and avalanche warnings. |
Use for maintenance of HVAC. home improvement,
fire safety,and energy conservation.. |
Measure roller, webs.
ink and glue temperature in factory automation
control processes |
Inspect product coming out of ovens, and also
tune and calibrate ovens. |
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| DX-series Handheld Precision IR Thermometers |
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| Specifications |
| model |
DX501 |
DX1001 |
|
temperaturerange |
-50 to 550 F
-45 to 287 C |
0 to 1000 F
-18 to 540 C |
| emissivity
adjustment |
Automatic Emissivity Compensation System |
| calibration
Requirement |
None |
| Lineaity Error (% of reading) |
-1% |
-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 F (-0.1 C) |
| Resolution |
0.1 F (0.1 C) |
| Response Time |
Approximately 0.1 Seconds |
| Field of view |
1:1 ( Approximately 53”) |
| Minimum Spot size |
Approximately 1/4 inch(6.4mm) |
| Special sensivity |
2 to 20 microns |
| Digital Output |
Rs232 (Optional on DX501, DX 1001 only) |
| Analog Output |
No Available (See D Series) |
| “F”/c Conversion |
Yes |
| Remote Sensor |
Available on all models; standard on DX 1201 and 1601 |
Instrument
Operating Temp. |
32 to 122 F (0 to 50 C) |
| Battery life |
Approximately 5000 Readings from a 9v Alkaline Battery |
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