Casella
Microdust pro Particulate Monitor
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Introduction
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Key
benefits
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The
Microdust Pro from Casella USA is a portable, real time monitor for
assessing the concentration of suspended particulate matter, and is
probably the most versatile instrument available with the ability to
measure from 1mgm-3 to
2500 mgm-3.
It is the only hand-held real-time dust
monitor on the market capable of graphically presenting variations in
dust concentration on a real time scrolling graph – no longer
is it necessary to wait to analyze results on a PC. |
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Wide range from 1mgm-3 to 2500 mgm-3
in single meter
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Data-logger with >15,700 readings
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Detachable probe
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TSP, PM10, PM2.5
or respirable measurements
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Firmware calibration and zero in
the field
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4 user defined calibration routines
available for differing dust types
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Alkaline or rechargeable batteries
or mains power
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32bit WinDustPro PC software
as standard |
Applications
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Occupational health & safety
monitoring
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Walk through surveys
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Site boundary monitoring & environmental
measurement
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Industrial process monitoring
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Testing respiratory equipment or
air filtration efficiency
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Research activities |
Each Microdust Pro is individually
factory calibrated, using a gravimetric technique.
The instrument can be returned to this “factory”
calibration setting at any time during its life by the use of a non-degradable
calibration insert (supplied with every unit). An individual gravimetric calibration
is also possible. This
involves the |
simultaneous collection of a gravimetric
(filtered) sample of the dust.
In this way, two averages are collected over the exposure period. One is from the filter, whilst the other is provided by the
averaging function within the instrument. It is then possible to derive the difference in these two
figures and correct accordingly. |
Operation
and use
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The Microdust Pro measures particulate
concentrations using a near forward angle light scattering technique. Infrared light of 880nm wavelength is
projected through the sampling volume where contact with particles causes
the light to scatter. The
amount of scatter is proportional to the mass concentration and is measured
by the photo detector. By
using a narrow angle of scatter (12-20°) the majority of light scattered
is in the diffracted and refracted components, which minimizes the uncertainty
associated with particle color, shape and refractive index. |
real time scrolling
display of concentration levels with user selectable time bases and auto ranging y-axis scale |
The
Microdust Pro features an internal logger that can store up to 15,700
data points over 32 separate runs.
The logging interval can be set from 2 seconds to 10 minutes. At 2 seconds, it is possible to record
8.75 hours of data; at 5 minutes, this equates to a total logging time
of 50 days. Recorded values
include:
·
Average concentration
over the logging period (mgm-3)
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Maximum concentration
over the logging period (mgm-3)
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Date and time stamp Logged results are downloaded to the included MS Windows
software package. |
Technical Information
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Sensing
Technique: |
Near
forward light scattering - 880nm infra red |
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Ranges:
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All
instruments provide 0 to 2500 mgm-3 over four ranges as standard: |
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Resolution: |
0.001
mgm-3 (1mgm-3) |
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Operating
Temp Range: |
32
to 122 °F (0 to 50°C) non condensing |
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Storage
Temp Range: |
-4
to 131 °F (-20°C to +55°C) |
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Calibration: |
Gravimetric
method using ‘Arizona Fine’ calibration dust (ISO12103-1,
A2) |
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Zero
Stability: |
±0.002
mgm-3/ °C |
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Span
Stability: |
<0.7%
FSD / °C |
POWER
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Battery:
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4
x AA / MN1500 cells - Alkaline or rechargeable NiCad |
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Operating
Duration: |
Alkaline
(2700mAh) typically >20 hours NiCad
cells (950mAh) typically >10 hours |
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Battery
Charging: |
Internal
NiCad fast charger circuitry (with time-out protection) |
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Charge
Rate: |
Fast
charge rate 450mA, Standby charge rate 55mA |
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Power
Adapter: |
Universal
input voltage range 100-240VAC, 47-63Hz |
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Output: |
12VDC
@ 800 mA |
GENERAL
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Analogue
Output: |
0
to 2.5 VDC FSD, 500W output impedance (3ms update rate) |
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Keypad:
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7
key tactile membrane |
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Weight: |
Instrument
only = 34.6 oz (0.97 Kg) (complete kit plus case = 10lb - 4.5Kg) |
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Dimensions: |
Probe
= 1.4 Ø x 11.6 in (35mm Ø x 290mm) total length Instrument
H x W x D = 9.8 x 3.8 x 2.0 in (245 x 95 x 50mm) |
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Maintenance: |
Factory
cleaning required annually depending on measurement conditions |
DISPLAY
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Display: |
128
x 64 pixel LCD graphics panel with backlight |
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Displayed
Values: |
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Instantaneous reading: Other readings:
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Rolling
average concentration over a user selectable period (1 to 60 sec) AVE
& MAX concentration since power on or reset |
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Scrolling
Graphs: |
100
/ 200 seconds, 15 minutes or 60 minutes (Y Axis auto-ranging or fixed) |
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Battery
voltage: |
Battery
Voltage with ‘OK’ / ‘Low’ status message. |
CALIBRATION
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Factory
Calibration: |
Traceable
isokinetic technique (wind tunnel) and ISO 12103-1 |
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User
Calibration: |
Four
user defined calibration settings available stored for later use. |
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Routine
Calibration: |
Firmware
calibration for zero & span setting in the field by user. Optical
calibration filter supplied (restores factory calibration) |
DATA
LOGGING
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Internal
Memory: |
64K
EEPROM providing 15,700 data points |
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Logging
Interval: |
Adjustable
from 2 to 600 seconds. |
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Recorded
Values:
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Average,
spot, max & min concentration over logging period |
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Serial
Interface: |
RS232
up to 38.4K baud |
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Ordering
Information |
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176000A 176093A 103214B 103187B 103182B 151280B 103396B |
Microdust
pro kit in carrying case with standard accessories Environmental
enclosure with pump, adaptor and rechargeable battery pack Gravimetric
dust adaptor Aspirated
adaptor Respirable
dust adaptor Size
selective adaptor Iso-kinetic
adaptor (for use with stack sampler) |
