Now Available:
¡¡
Applications:
• Measure UV
energy output of inaccessible UV environments such as web,
flexo and other applications
where either space is limited or it is difficult to reach
• Establish, document and maintain UV process
windows
• Meet ISO, quality and customer requirements for
SPC/SQC
• Coordinate readings from on-line sensors installed
to continuously monitor a cure station
• Hazard application - monitor stray UV in the
workplace
Features:
• Measures UV over a wide
dynamic range with auto scaling and adjustment
• Non-conductive Light Guide is electrically
isolated from the PALM Probe Radiometer¡¯s base
• Self contained, easy to use with two raised
membrane switches
• Display toggles between Watts, Joules, and Seconds
during data collection and at the end of data collection
• UV ranges of UVA, UVB,
UVC, or UVV
• Battery powered with two user replaceable AA
batteries with low battery warning
Electrical Specifications:
• UV Range:
100 µW/cm2-10
W/cm2
• Spectral Response: UVA 320-390nm, UVB 280-320nm,
UVV 395-445nm
• Display: LCD with 4 digits and floating decimal
place
• User Interface: Two raised membrane switches
• Operating Temp.: Instrument body: 0-70¡ÆC
• Time-out period: 10 Minutes
• Batteries: Two AA Alkaline Batteries
• Battery Life: 25 Hours run time
Mechanical Specifications:
• Overall Length:
25.75¡± (65.4 cm)
• Probe Body Length:
7.5¡± (19.0
cm)
• Light Guide Length:
18.25¡± (46.4 cm)
• Weight:
21 ounces (596 grams)
• Light Guide Temperature Resistance:
750¡ÆF on a continuous basis;
much higher for measurement length exposures
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The
PALM PROBE UV RADIOMETER is a process control instrument
designed for measuring UV energy within inaccessible
environments. The PALM Probe provides a safe, reliable
measurement solution for UV-web and other applications.
PALM is an acronym for Production Ambient Light
Measurement¡±. The PALM Probe has an extremely wide dynamic
range allowing it to measure very low (i.e. fluorescent bulbs)
and very high (i.e. powerful UV curing systems) levels of UV.
As the harsh physical conditions inside a UV curing chamber
include extreme temperature variations, the PALM Probe is
designed to withstand these conditions as well as protect the
operator and instrument from damage or electrical shock. To
use, simply hold the base of the instrument and position the
light guide under the UV source.
Operation
An input aperture at the tip of the PALM Probe light guide
detects all wavelengths of ultraviolet, visible and infrared
radiation. The light is directed down the light guide to the
base of the instrument where a UV filter passes the UV light
of interest to the photodetector. The photodetector converts
the light energy to a current that is proportional to its
intensity. The signal is then conditioned, digitized,
processed and displayed on the device¡¯s LCD.
The light guide is constructed of steel alloy and coated with
a non-conductive ceramic coating to insulate and protect the
user from accidental shock. It is further isolated from the
instrument body by a non-conductive Delrin block. The base
contains the instrument¡¯s optics, electronics, battery and
display functions, and can be held either with an 'over' or
'under' hand type of grip. Raised membrane switches permit
easy control.
The PALM Probe radiometer has a very wide dynamic range that
automatically adjusts itself for the user. For example, the
instrument can measure light from approximately 100 microWatts/cm2
(µW/cm2) up to 10
Watts/cm2 (W/cm2)
within the UVA (320-390nm) bandwidth. The decimal point in the
LCD 'floats' over three places to cover the wide dynamic range
on the unit.
The PALM Probe¡¯s display allows the user to alternate
between Watts-Joules-Seconds during data collection and after
a reading has been made. The SELECT button allows the user to
toggle between the values.
When collecting irradiance data, the display will change as
the light guide changes position under the UV source. As the
aperture opening moves into the focused peak irradiance area
of the UV source, the reading will increase. Variations in
irradiance may also be seen when the PALM Probe¡¯s light
guide is moved along the length of a UV bulb. The LCD display
will automatically scale and adjust as the radiometer takes
readings. Pressing the RUN/STOP button will stop the
collection of data and the highest irradiance value measured
during the collection of data will be displayed. Most users
will find that the irradiance value (W/cm2)
displayed is the most important value when it comes to process
control for a particular application.
UV energy density (also widely referred to as ¡°dose¡±)
incorporates time into the irradiance measurement. The PALM
Probe displays the energy density, or dose, value in Joules
(J/cm2 ) on the LCD. Dose
is an integration of the area under the irradiance curve. The
dose reading increases as the reading continues. The speed at
which the dose increases depends on the irradiance value.
Switching to the built-in timer will help monitor the 'time
component' of the dose reading for more consistent results.
Placement of the PALM Probe in the same location is important
in order to get consistent and repeatable irradiance values to
calculate dose readings.
LCD Display
The LCD Displays on the PALM Probe is easy to read and
understand as the user will only see the segments on the
display that pertain to the current reading
On-line Monitoring Equipment
PALM Probe Radiometer readings can be coordinated with the
readings obtained from on-line monitoring instruments. When
conditions are ideal (clean reflector, new UV lamps), the
on-line displays can be set to read 100% UV intensity.
Baseline readings of the UV intensity can be obtained with the
PALM Probe. The UV will generally decrease over time as the
reflectors and UV bulbs degrade. The readings displayed on the
on-line monitors can be compared to the readings on the PALM
Probe. The on-line monitors can provide continuous monitoring
including alarm functions and feedback information.
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