Casella Dust-Detective User manual

USER MANUAL
Static Air Sampling Enclosure
HB3341-07
November 2018
Casella
Regent House,
Wolseley Road,
Kempston,
Bedford.
MK42 7JY
T:[phone]
F:[phone]
E: [email protected]
www.casellasolutions.com

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Contents
Warnings........................................................................................................................................................................2
Disclaimer......................................................................................................................................................................3
Introduction...................................................................................................................................................................4
System overview..........................................................................................................................................................5
Operation........................................................................................................................................................................7
Installation ....................................................................................................................................................................7
Storage of PUF Filters....................................................................................................................................................7
PUF Filter Adaptor.........................................................................................................................................................8
Inserting / Removing PUF Filters...................................................................................................................................8
Collection Filter Cassette ..............................................................................................................................................9
Starting measurements...............................................................................................................................................10
Checking Probe Span...................................................................................................................................................10
Sampling Pump ...........................................................................................................................................................10
Service..........................................................................................................................................................................11
Technical specifications ..........................................................................................................................................12
Part Numbers..............................................................................................................................................................13
Spares and accessories ...............................................................................................................................................13
Ordering information..................................................................................................................................................13
Declarations.................................................................................................................................................................14

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Warnings
The Dust Detective does not present a safety risk when you use it as instructed in this User Manual.
However, it is possible that the environment where you use the instrument may present a safety risk.
For this reason, always follow correct, safe working practices.
The Microdust Pro and associated Static Sampling Unit is non-intrinsically safe and MUST NOT be used
within a hazardous area.
DISPOSAL OF BATTERIES: Batteries and battery packs must never be disposed of by placing in a fire or
incinerator, nor must they be punctured, crushed or otherwise mutilated or opened up in any way. Disposal
must be in accordance to local environmental legislation.
Ensure the Apex2 and Microdust Pro are held firmly by the Velcro straps provided, otherwise damage to the
instruments could occur.
All optical measurement systems are sensitive to the presence of moisture droplets both in the air and
bonded to particulate matter. To prevent possible measurement errors, the system should not be used in
conditions of high humidity, rainfall or condensation.
The purge valve must not be closed during operation. Failure to open it will result in pump shutdown errors.

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Disclaimer
Do not use the Dust Detective until you have thoroughly read this manual or have been instructed by
a Casella engineer.
At the time of writing, this manual was up to date but due to continual improvements the final
operating procedures may differ slightly from those in the manual. If there are any questions please
contact Casella for clarification.
Casella makes continual advancements in its products and services. We therefore reserve the right to
make changes and improvements to any information contained within this manual.
Whilst every care is taken to ensure that the information in this manual is correct, Casella will assume
no responsibility for loss, damage or injury caused by any errors in, or omissions from, the
information given.

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Introduction
With greater awareness of environmental
pollution from fine particulates and increasing
enforcement of COSHH and environmental
legislation, the demand for more area and
perimeter monitoring on a short to medium
term basis is on the increase. This need for
real-time particulate information is a
requirement in general industry, when looking
at Total Suspended Particulate (TSP), and at
inhalable and respirable dust levels as a health
issue.
CASELLA introduced the “Dust Detective” Static
Air Sampling enclosure for exactly this
application. This accessory provides a simple
solution for short to medium term fixed area
monitoring with the Microdust Pro and Apex2
sampling pumps and is designed specifically for
use in indoor applications, but some short-term outdoor perimeter samples can be undertaken with the unit.
The IP65 case is designed to accommodate a standard Microdust Pro as well as an Apex2 air sampling pump
which provides a precise inlet flow rate.
The Dust Detective has been designed as an accessory for existing Microdust Pro users as well as for potential
customers looking for a complete system when supplied complete as the Dust Detective. In this format, the
enclosure also doubles as the equipment carry case for the Microdust Pro.
Figure 1
Inlet
‘Hat’ can be
removed to allow
clean air filter to be
fitted.

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System Overview
The complete system (Part number 206107A) would require the purchase of the static air sampling enclosure
(Part number 206200D), plus the following additional items:-
•Microdust Pro,
•Apex2ISPlus air sampling pump and charger
•Pre weighed GFA filters –if gravimetric analysis is required
•PUF filters –if size selection of dust fractions is required
The key component to this accessory is the sampling inlet can utilise Polyurethane Foam (PUF) for size-
selective filter techniques. If used without the PUF filters then total dust levels are sampled. Size-selective
filters were originally developed for operation in the Conical Inhalable Sampler (CIS) as detailed within the
Health and Safety Executive publication MDHS 14/4. The foam filter specifications and dimensions determine
the desired aerosol size selection characteristics and eliminate particle sizes greater than PM10, PM2.5 or
Respirable (4um) as appropriate. The larger particles become trapped and collect within the foam matrix,
whilst all particles below these “cut-off points” pass through the PUF filters and enter the measurement
chamber, where the
real time mass
concentration is
established.
After passing through
the Microdust Pro,
particulate matter is
deposited on a 37mm
filter which may be
used for gravimetric or
chemical analysis.
Remember however,
although the Dust
Detective system has
been designed to
monitor particulate
fraction concentrations
in a variety of
environments, it does
have some operating
limitations. The
instrument is not
designed to operate
continuously out of doors for long periods over approximately 13 hours.
Figure 2

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Due to the light scattering principle used within the instrument, any moisture which individual particles attract
at periods of high humidity or temperatures approaching “dewpoint” will be “seen” by the instrument as
larger particles. This biases results towards greater concentrations. Also, during these periods, any air being
drawn through the instrument which is high in humidity may condense on the optics and distort the light
beam, producing spurious results.
The system incorporates an Apex2 sampling pump to draw the sample air through the inlet pipe at a user
selected flow rate. PUF filters are designed to operate at a flow rate up to 3.5 L/min, but running at 2L/min is
adequate for the system. The inlet head is designed to prevent the ingress of insects and other large foreign
objects. A dust cap is provided to seal the inlet port on the case lid whenever the inlet tube is removed for
transit purposes.
Size selection of the sample stream is performed by passing the sample through a PUF foam filter appropriate
to the chosen sampling strategy, (PM10, PM2.5 or Respirable).

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Operation
This section describes how to use the product to take air samples using the minimum of settings. The Apex2
and Microdust Pro have many other menu and settings options and these are described their individual
manuals.
Installation
Cutouts are provided in the foam for the Microdust Pro and Apex2 sampling instruments. Ensure both units
are fully charged up or have new AA cells if required before insertion.
Note: Ensure the Apex2 and Microdust Pro are held firmly by the Velcro straps provided; otherwise
damage to the instruments could occur.
Connect the Apex2 pump to the sampling spigot as illustrated in Figure 1.
Connect the Microdust probe into the Adaptor (Figure 5). When locked correctly into position, the complete
assembly is prevented from rotating or moving laterally on the Probe (see Figure 4). The body of the probe
should be aligned so that the cable from the probe is aligned as shown in Figure 2.
The enclosure is fitted with purge valve which must be removed during operation (see Figure 3). Failure to
remove will result in pump shutdown errors.
Storage of PUF Filters
The PUF filters should be kept in a clean and preferably air-conditioned environment.
Figure 3
Purge valve
Leave slightly
unscrewed
during
operation.

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PUF Filter Adaptor
For size-selective monitoring applications, it
is necessary to load the appropriate foam
filter(s) into the inlet adapter. If TSP (Total
Suspended Particulate) monitoring is
required, then no foams should be fitted
within the inlet assembly and the pump run
at 2L/min.
The type of foam filter loaded into the
adapter determines the size of particulate
matter being monitored by the Microdust
Pro and collected on the filter. Although the
PUF foam inserts have been designed as size-selective filters to capture particles larger than a specified mean
aerodynamic size, it is also possible to weigh the PUF inserts before and after measurement to establish both
the total suspended particulate (TSP) value and the desired size fraction.
Inserting / Removing PUF Filters
The PUF filters should be carefully inserted or removed from their respective cassettes using clean tweezers and
plastic gloves. Avoid subjecting the filters to physical damage, creasing or folding. Filters should be loaded into
the relevant housing as shown in Figure 4.
In Figure 5 below, the PUF filter holder is shown (A). To remove it unscrew the locking ring (B). It can be easier
to remove the Microdust probe first by releasing the quick release clips (C). Note the clear cassette (D) can be
removed to fit GFA filters as necessary.
Figure 4

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Collection Filter Cassette
A Clear filter Cassette holds a 37mm filter. The desired filter type (typically of the GFA type) should be
conditioned and pre-weighed (if required) before being loaded into the cassette. Always handle filters with
care to prevent contamination or physical damage. It is recommended that even if gravimetric analysis is not
being performed a GFA filter (P102051) is still used to prevent particulate getting into the pump.
Note: The filter cassette holder comes with one support pad to support filters. This is not in itself a
filter for gravimetric analysis. GFA filters should be purchased separately.
B
C
D
Figure 5