STICKY PAD
READER
This instrument is designed to measure particulate
nuisance using the method of Beaman & Kingsbury |
CONTENTS OF KIT
-
Optical head containing main PCB
-
Plugtop power supply
-
Locating mask
-
Calibration sheet
-
Instruction leaflet
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BENEFITS
- Sticky pad method of assessing dust nuisance is
cheap, easy and quick to use*
- Large numbers of stations can be serviced cheaply.
- Deposition and/or flux can be investigated
- Smoke Stain filters can be assessed**
- Linear relationship between reflected light energy
and meter reading
- Simple two-point calibration, either to emulate
other reflectometers or to user’s own requirements
- Concealed screwdriver adjustment of zero and
calibration to avoid accidental alteration of settings
- Very low power consumption (< 2 Watts) to
avoid thermal drift problems
- Stable digital read-out, not requiring frequent
recalibration
- Matt black anodized finish to minimize internal
reflection
- Computer-designed illumination system to ensure
spatially uniform
illumination of the sample, using lamps with expected life of 5000 hours
- Spare parts and repairs available
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OPERATING PRINCIPLE OF THE READER
The sticky pad reader consists of a matt black
anodized cylinder approximately 65mm dia x 120mm high, and a locating
mask. The cylinder contains the optical system and electronics,
including the display, calibration and zeroing devices. Regulated power
is fed to the device by a 13-amp plugtop power supply which requires a
normal 230-240v 50Hz AC supply.
The sticky pad under test is illuminated by three
tungsten filament bulbs, near the lower end of the cylinder, spaced in
such a way as to give a uniform brightness across the entire sample,
although the photodiode which is used to measure the degradation of the
sticky pad is constrained to view a circular disc of 6mm diameter in
the centre of the illuminated area. In accordance with similar
instruments, the reading on the display is set to 100 when the pad is
clean, and decreases as the dust loading increases. As the device is
linear, a simple two point calibration is all that is needed before
putting the instrument to work. A reading is then taken simply by
placing the mask on the desired part of the sticky pad, putting the
instrument on the mask and noting the meter reading.
REFERENCES
* Beaman & Kingsbury, Clean Air, Vol 11, No.2, pp77-81
** BS1747 Pt2 |
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