UEi UGI INF200 - Manual (Page 4)

Validation
NOTE: Always validate your instrument’s accuracy each time it is put
into service.
The term validation, as we use it here, is the method used to verify the
measurement you are taking is accurate. Emissivity is a value, referring
to the surface you are targeting, that relates to that surface’s ability to
“emit” versus “reflect” heat energy. This value is a ratio of emitted heat
energy to the total heat energy available (example, .95 to 1). Because
the ratio is always referenced to a total available value of “1”, only the
emitted heat value, typically between .30 for surfaces that reflect most
of the available heat energy, to a high of around .98 for surfaces that
emit nearly all of their heat energy.
Some shiny, bright, polished or smooth surfaces reflect heat energy,
and therefore, don’t have high emissivity ratings. Generally these surfaces
are not recommended as targets for non-contact thermometers. They ca n ,
h owever, be prepared for non-contact measurement. Compensating for
e m i s s i v i ty of an object is part of the validating procedure. For frequently
repeated processes that warrant the use of a non-contact thermometer,
take the time to perform one of the following prepara t o ry procedures:
• Pre-validate Accuracy: Most non-metallic surfaces have a
natural emissivity value of about .95 (this instrument’s factory
default), and need no additional preparation for measurement.
To validate, take sample temperature readings from a surface
in a controlled environment and compare them to the known
temperature. For example, measure an empty cardboard box
that has been sitting in a room for at least ten minutes, and
compare those readings to the known room temperature.
If a controlled environment is impractical, use contact
temperature measuring devices such as UEi’s DT series
thermometers or any one of the broad line of temperature
measurement products, used in conjunction with one of UEi’s
ATT series contact thermometer probes.
For a quick validation, compare the reading of a prepared test
area (see the next section ) to an unprepared area. If there is no
difference, there's no need for additional preparation.
• Physically Prepare Surfaces For Consistent Readings:
Some objects, such as lead and certain other alloys have low
e m i s s i v i ty ratings. When temperature extremes and environmental
conditions allow, the surface of such material can be modified to
change the emissivity value to the conventional .95.
To prepare these surfaces to provide an accurate reading using
a non-contact thermometer, pre-treat (to emit energy) the
surface with flat colored paint, masking tape, or some similar
rough, dark, dull or porous coating that has an inherently high
emissivity value. Make sure these surfaces won’t experience
extreme environments that may burn, weather or otherwise
degrade the surface preparation.
Be sure not to harm the surface of the object you are preparing
for non-contact measurement. Often materials are designed
to be reflective to control heat build-up. Emissive surfaces
may cause excessive heat energy to be retained, even in a
small area, which may eventually damage the equipment or
impair operation.
Once the surface has been prepared, validate your readings as
previously indicated.
Recalling Memory Points
With each pull of the trigger, four values are recorded in memory.
• The highest temperature measured
• The lowest temperature measured
• The average temperature (time weighted)
• The value last displayed before releasing the trigger
A total of nine sets of these four values, representing nine trigger pulls,
are available for recall. To review recorded values, start with the
instrument off, (trigger released and nothing visible on the LCD), then
press and release the “MODE” push-button. The number “1” will
appear on the display, indicating the latest of the nine sets of values
recorded in memory. You may now either cycle through each of the
four values recorded during the last trigger pull, or go to one of the four
values, then select the number of the trigger pull you wish to review.
For example, to select the high temperature measured three trigger pulls
ago, you may either:
1. Press the “MODE” push-button once. The number “1” and
a value appears.
2. Press the “ /▲“ push-button twice. The number “3” and
a value appears.
3. Press the “MODE” push-button once again. The word “MAX”
appears in the lower left of the LCD, along with the highest
temperature recorded three trigger pulls prior.
OR:
1. Press the “MODE” push-button once. The number “1” and
a value appears.
2. Press the “MODE” push-button once again. The word “MAX”
appears in the lower left of the LCD, along with the highest
temperature recorded during the last trigger pull.
3. Press the “ /▲“ push-button twice. The number “3” and
a value of the highest temperature recorded from three trigger
pulls ago appear.
To maneuver up and down through recorded values, press the
appropriate “˚F/˚C/▼” or “ /▲“ push-button to view the different
readings on the LCD.
Audible Alarms
The INF200 will sound an audible alarm at both an upper and a lower
temperature limit, whig you set.
To adjust the alarm, start with instrument’s power turned off. Press and
hold the “MODE” push-button until you hear an audible beep. Either
“MAX” or “MIN” will be displayed on the LCD, along with a value to
the right. Do not pull the trigger.
Select the mode “MAX” or “MIN” you want the instrument to provide
the alarm for by pressing either the “˚F/˚C/▼” push-button to select the
low temperature alarm or the “ /▲“ push-button to select the high
temperature alarm. Once the instrument indicates the alarm mode you
want to set, press the “MODE” push-button again.
INF200-MAN P. 3