CASELLA MEASUREMENT
Regent House,
Wolseley Road,
Kempston, Bedford,
MK42 7JY, U.K.
Phone: +44 (0) 1234 844 100
Fax: +44 (0) 1234 841 490
E-mail: info@casellameasurement.com
Web: www.casellameasurement.com
CASELLA CEL Inc., a subsidiary of IDEAL Industries, Inc.
415 Lawrence Bell Drive,
Unit 4
Buffalo,
NY 14221 U.S.A
Toll Free: (800) 366-2966
Tel: (716) 276-3040
Fax: (716) 276-3043
Email: Info@CasellaUSA.com
Web: www.casellausa.com
User Manual
CEL-712 Microdust Pro
Real-time Dust Monitor
HB4048-01
User Manual
CEL-712 Microdust Pro Real-time Dust Monitor
Contents
1 Introduction ..................................................................................................................................... 4
1.1 Structure of this User Manual ............................................................................................... 4
1.2 Safety .................................................................................................................................... 6
2 Features and description .................................................................................................................. 8
2.1 Principle of operation ............................................................................................................ 9
2.2 Display screen groups ........................................................................................................... 9
2.3 Connections ......................................................................................................................... 11
3 Quick reference ............................................................................................................................. 13
3.1 Providing power for the instrument .................................................................................... 13
3.2 How to fit the measurement probe ...................................................................................... 15
3.3 Using the controls ............................................................................................................... 16
3.4 How to follow the operating instructions ............................................................................ 17
3.5 Switch-on ............................................................................................................................ 17
3.6 Set the instrument’s display language ................................................................................. 20
3.7 Set the time and date ........................................................................................................... 21
3.8 Setup ................................................................................................................................... 22
3.9 Set the display backlight ..................................................................................................... 23
3.10 Alarm and analogue output settings .................................................................................... 24
3.11 Checking the instruments Zero and Span ........................................................................... 27
3.12 Calibration for specific particulate types - Gravimetric calibration .................................... 33
4 Making a measurement Run .......................................................................................................... 37
4.1 Measurement types ............................................................................................................. 38
4.2 Starting a measurement Run ............................................................................................... 38
4.3 Viewing stored Runs ........................................................................................................... 41
4.4 Deleting stored Runs ........................................................................................................... 42
5 USB connection............................................................................................................................. 43
6 Insight Data Management Software .............................................................................................. 44
6.1 Installing and starting the Insight Data Management Software .......................................... 45
7 Sampling accessories..................................................................................................................... 46
7.1 Sampling Adapters (PUF Size Selective and Gravimetric TSP) ........................................ 46
8 Specifications ................................................................................................................................ 50
8.1 Instrument specification ...................................................................................................... 50
8.2 Displayed values ................................................................................................................. 52
8.3 Data logging ........................................................................................................................ 52
8.4 Optional accessories ............................................................................................................ 53
8.5 Standards compliance ......................................................................................................... 54
9 Maintenance and servicing ............................................................................................................ 55
9.1 Lens contamination ............................................................................................................. 55
9.2 General maintenance ........................................................................................................... 56
9.3 Servicing hints .................................................................................................................... 57
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CEL-712 Microdust Pro Real-time Dust Monitor
10 Servicing and warranty arrangements ........................................................................................... 58
10.1 Inspection and test ............................................................................................................... 58
10.2 User servicing ..................................................................................................................... 58
APPENDIX - Serial Communication Interface .................................................................................... 62
11 Command set for remote control ................................................................................................... 62
3 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
1 Introduction
The CEL-712 Microdust Pro is a real-time dust monitoring instrument ideally
suited for the measurement of particulate concentration such as from dust,
smoke, fumes, pollen and other aerosols from combustion, materials
processing, manufacturing, energy generation, vehicle engine emissions, and
construction. Pollutants of this type reduce visibility, spread contamination and
can cause illness and low worker productivity from the inhalation of toxic
substances. Many of them are also recognised as contributory factors to many
chronic and acute medical conditions, including asthma, bronchitis, and lung
cancer.
The Microdust Pro instrument is not like traditional gravimetric methods of
dust measurement, which require a significant sampling period and are not
suited to the real-time evaluation of trends in concentration levels. The
Microdust Pro is an ideal survey instrument for the assessment of real-time
particulate concentration in mg/m³. It is totally portable, and has a detachable
probe that allows operation in relatively inaccessible areas, making it suitable
both for fixed site and for general survey applications.
The Microdust Pro instrument uses a proven forward light scattering principle
to make accurate and repeatable measurements of dust concentration. It
provides the following features as standard:
Graphical representation of concentration trends
Internal data logging
A simple and clear colour user interface
Wide measurement concentration capability to suit a vast range of dust
monitoring applications.
The Microdust Pro instrument allows you to download data to the Casella
Insight Data Management Software. This application provides a real-time
display of particulate concentration levels measured by the instrument. Refer to
the on-line help system installed with the Casella Insight Data Management
Software for full instructions on how to use this application.
1.1 Structure of this User Manual
The structure of this User Manual is designed to help you find the information
and instructions you need to complete a task easily.
To help you find the information you need quickly in the electronic version of
this User Manual, it includes ‘clickable’ links. The links appear as blue
underlined text. You can also click the names of chapters and sections in the
bookmark panel, and in the table of contents, to jump to that part of the
manual.
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CEL-712 Microdust Pro Real-time Dust Monitor
This colour…
indicates…
Light Blue
Memory results screens
Green
Measurement Run screens
Red
Measurement stop screens
Yellow
Calibration mode
Blue
Menu screens
Colour coding
The Microdust Pro screens use a colour code to help you identify their purpose
quickly. This manual uses the same colour codes. Refer to section 2.2 “Display
screen groups” beginning on page 9 for more information.
5 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
WARNING - CLASS 1 LASER PRODUCT
The Microdust Pro instrument is an enclosed Laser based system.
The internal laser radiation is the equivalent of Class 2 under normal conditions
and potentially 3B under fault conditions.
Laser Source <20mW @ 635 nm.
Caution – use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation exposure.
Risk of Visible Laser Radiation when opened. Avoid exposure to beam.
This product shall only be opened by authorised and competent personnel.
The following warning labels are displayed on this instrument:-
1.2 Safety
The Microdust Pro instrument 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, and you must ALWAYS
follow correct, safe working practices.
6 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
WARNING – DO NOT USE IN VOLATILE OR EXPLOSIVE ATMOSPHERES
Always be aware of the risks in the environment where you are working.
The Microdust Pro instrument is NOT intrinsically safe. DO NOT use it in an
atmosphere where explosive concentrations of vapours or dusts might exist.
Wear approved ear defenders when making measurements in noisy
environments.
Wear approved protective clothing and footwear suitable for the environment
where you are making measurements.
Always follow local safety regulations, and be aware of risks in the area where
you are working.
CAUTION - GENERAL
Use the Microdust Pro instrument only as instructed in this User Manual. Do not use the
instrument for any purposes for which it has not been designed.
The Microdust Pro is a precision instrument. Always handle it with care.
Do not use the Microdust Pro instrument if it has been damaged. Refer to section 10
Servicing and warranty arrangements beginning on page 58 for instructions to follow if
the instrument has been damaged or has developed a fault.
The Microdust Pro instrument can operate from a battery power supply.
Use only batteries of the correct type, and do not mix battery types in the
instrument. Refer to Battery supply on page 13 for advice about battery types.
Do not leave discharged batteries in the instrument.
Install new batteries as a complete set. Do not fit batteries that have a mixed
state of charge. Refer to How to fit new batteries on page 13 for instructions to
install batteries.
Remove all batteries from the Microdust Pro instrument if you will not use the
instrument for a long time.
Always follow local regulations to dispose of used batteries.
The Microdust Pro instrument is not waterproof. Do not immerse the instrument in water
or use it in the rain.
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CEL-712 Microdust Pro Real-time Dust Monitor
1
3
2
4
5
7
6
2 Features and description
Figure 1 shows the main features of the Microdust Pro instrument. Refer to
these details to help you identify the relevant controls to use when you perform
the tasks and instructions in this User Manual.
Figure 1 Main features of the Microdust Pro instrument
1. Probe connector and cable
2. Probe
3. ON/OFF key
4. Probe collar (covering the sampling hole)
5. Soft keys
6. Run/Stop key
7. Navigation keys
Refer to section 3.3 Using the controls on page 16 for a description of the Soft
keys, of the Navigation keys, and of the Run/Stop key.
8 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
11
21 3141
2.1 Principle of operation
The Microdust Pro instrument uses a modulated laser light source passing into
a measurement chamber.
Figure 2 Sampling probe
1. Laser source
2. Sample volume
3. Optical detector
4. Light stop
Under clean-air conditions, all light is prevented from following a direct route
to reach the laser detector (3) by a light stop (4). When dust particles enter the
sample volume (2), the beam of laser light is scattered within a narrow angle
and some of it can reach the detector by indirect routes.
By using a narrow angle of scatter, the instrument is made less sensitive to
variations in the refractive index and colour of measured particulate.
2.2 Display screen groups
The Microdust Pro instrument has groups of screens that allow you to set up
and operate the instrument, and to see the results of the instrument’s
measurements. The screens have colour-coded bars at their top and bottom
edges to help you identify which screen group they belong to. Refer to Colour
coding on page 5. Figure 3 below also shows the colour codes together with the
way the screen groups relate to each other.
Note that the contents of some screens may vary, depending on the variant of
instrument you are using.
9 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
Calibration
mode
Menu
screens
Status
Measurement
stop screens
Measurement
run screens
Memory
results screens
Start
USB
connection
mode
Figure 3 Screen groups
Each screen group includes one or more individual screens. The instructions
included throughout this manual show examples of the individual screens.
10 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
2.3 Connections
All connections to the Microdust Pro instrument are made through three ports
behind a hinged panel at the bottom of the instrument.
Figure 4 Connection port
1. Power input port
2. Mini B USB port
3. 2.5mm output port
Power input port
The power input port allows you to connect a DC power supply to operate the
instrument.
You must use a 2.1 mm DC plug that has the positive supply connected to the
centre receptacle.
Refer to Mains DC supply on page 14 for information about the requirements of
a suitable mains DC power supply for use with the Microdust Pro instrument.
Mini B USB port
The Mini B USB port allows you to connect the Microdust Pro instrument to
PC.
When you connect the instrument to a PC, the instrument appears as a
removable disk drive in Windows Explorer.
The Casella Insight Data Management Software is supplied with the
Microdust instrument. You must use this program to download measurements
directly from the instrument without using Windows Explorer. The Insight
software includes analysis and graphing tools, which you can use to analyse and
view measurement Runs.
11 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
2.5 mm output port
The 2.5 mm output port is a 2.5 mm stereo jack. It has two functions:
The tip connection (1) provides an
analogue DC output signal. The
output level is 2.5 VDC to
represent the full-scale of the range
currently selected.
The ring connection (2) provides a
switched open-drain Alarm output
signal which may be used to control external alarms or monitoring
devices. The output line is pulled low whenever the Alarm threshold
level and trigger time is exceeded. It is cleared when the prevailing dust
level fall below the defined ‘Alarm Off’ conditions.
The maximum voltage and current should be <15 volts at <500 mADC.
The output impedance for the DC output is approximately 500Ω.
If you use the DC output, you should make certain the load impedance is
as high as possible.
The signal ground for the outputs is on the barrel connection (3).
12 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
IMPORTANT
To save power when operating on batteries, the Microdust Pro instrument switches
OFF automatically if no measurement Run is in progress and there is no key-press
activity for five minutes.
You should operate the instrument on a mains DC power supply if you must leave it
unattended while making an extended measurement Run. The instrument does NOT
switch off automatically when operating from a mains DC supply.
3 Quick reference
3.1 Providing power for the instrument
The options for providing power for the instrument are:
Batteries
12 VDC adaptor (part number -PC18)
USB connection (part number -CMC51)
Battery supply
You can use alkaline or rechargeable AA batteries to operate the instrument. Do
not use a mixture of alkaline and rechargeable batteries at the same time.
The operating time that you can expect from a fully charged or new set of
batteries depends on the battery capacity and whether you use the instrument’s
backlight. Environmental conditions such as the ambient temperature also
affect battery life. Typical battery life based on Alkaline / NiMH (2700 mAh) is
13.5 hours at medium backlight level.
You should also carry a spare set of batteries.
How to fit new batteries
Before you begin:
Read the caution notice about Batteries on page 7
You should check that the batteries have adequate battery life before you begin
a measurement. Replacement batteries should be new or fully charged.
13 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
NOTE
The Microdust Pro instrument disconnects the internal batteries whenever a mains
DC or USB power supply is applied. The batteries do not recharge when you operate
the instrument from a DC supply.
If you use rechargeable batteries with the Microdust Pro instrument, you must use an
external battery charger of the correct type to charge the batteries. Follow the
charging instructions supplied by the battery manufacturer to charge the batteries.
Fitting the batteries
You do not need any special tools to fit new batteries to the instrument.
1. If necessary, press and hold the ON/OFF key to switch the instrument
OFF.
2. Remove the three exhausted batteries from the battery compartment.
3. Fit fully-charged batteries into the battery compartment, observing the
polarity markings.
4. Press and release the ON/OFF key, and check the battery symbol shows
the batteries have a full charge level.
Mains DC supply
The use of an external 12 VDC mains power supply enables the instrument to
operate for extended measurement time periods.
The instrument will automatically switch ON whenever an external 12 VDC
supply is connected.
The instrument DOES NOT include a mains DC supply as standard. Please use
the optional Casella power supply (part number -PC18).
USB supply
When you connect the instrument to a PC through a USB cable, the instrument
receives power to operate at 5 V DC from the PC. There is no need to use a
mains DC power supply to operate the Microdust Pro instrument when you
connect it to a PC USB port.
Battery condition indicator
When the Microdust Pro instrument receives power from a mains DC power
supply or from a USB port on a PC, the battery condition symbol on the
instrument’s screen always shows a fully charged battery condition, even if the
batteries are not fully charged.
14 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
IMPORTANT
The instrument might give reading errors when you use it in very bright or changing
ambient light conditions. This is because the measurement method depends on the
scattering of light.
Take care when you use the instrument in direct sunlight. Shield the probe from direct
light sources. You can use a gravimetric or size selective adaptor, or use the
instrument within the environmental enclosure to eliminate the effects of high ambient
light levels.
CAUTION
DO NOT pull on the cable to disconnect the sampling probe.
Slide knurled sleeve away
from the instrument
Red dot is on top
3.2 How to fit the measurement probe
The detachable sampling probe houses the measurement chamber together
with the associated optics, including the laser diode emitter and detector.
Connect the sampling probe by aligning the red dot on the connector to face
forward on the instrument, and insert the connector into the socket at the top of
the instrument.
How to disconnect the sampling probe
To disconnect the sampling probe, pull the connector’s knurled outer sleeve
directly away from the main body.
The sampling probe may be unclipped from the side of the control unit for
hand-held operation.
15 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
3.3 Using the controls
The Microdust Pro instrument is designed to
allow easy operation. The instrument has only
seven (7) control keys, shown on the right. These
are as follows:
The Soft keys (A and B).
The Navigation keys (C) .
The Run/Stop key (D) .
The instrument is small in size, and it is usually possible to hold and operate it
using only one hand. For safety, you can attach a wrist strap near the bottom of
the instrument.
Soft keys
The Soft keys A and B allow you to select between the two options showing at
the bottom of the screen. These two options change, depending on which screen
is showing on the instrument’s display.
Navigation keys
The four navigation keys allow you to select items on the main part of the
screen. Press the , , or Navigation key to change to the next selection
in the direction of the arrow.
Run/Stop key
The Run/Stop key allows you to start and to stop a measurement Run.
During a Run, data is saved to internal memory for later download.
Press the key when the instrument is in the Stop mode (Bars at top and
bottom of screen are Red) to start the Run. Refer to section 4.2 Starting a
measurement Run beginning on page 38 for information about the Run and
Stop modes.
Press the key during a Run to stop the Run.
16 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
3.4 How to follow the operating instructions
Most of the operating instructions in this User Manual are shown using
sequences of screen images. Arrows and numbers explain the sequence of steps
that you must perform to complete the operation described by the images.
When an arrow points to indicate a screen icon, use the navigation keys to
select that icon. Selected icons are highlighted by a grey border.
This example shows the Settings icon when it is not selected:-
And the same icon when it is selected:-
The bottom of the screen always shows a wide
coloured bar with two instructions. Press the soft
key that is below one of the instructions to perform that instruction. The colour
of the bar indicates the purpose of the screen. See Colour coding on page 5 for
an explanation of the screen colours used.
If the instructions require you to change a value, use
the navigation keys to select the character in the
value, and to change the selected value.
A full instruction sequence might require you to repeat selections and soft key
presses multiple times.
3.5 Switch-on
Press the ON/OFF key to switch the Microdust Pro instrument on.
After you switch the instrument on, it shows an introduction screen for a short
period. This screen includes the following information about the instrument:
Write down these details and save them in a safe location. You must give this
information to the service agent if the instrument develops a fault.
The instrument’s serial number.
The firmware version that is operating inside the instrument.
Two lines of user-defined details, for example the user’s name and
telephone number. You must use the Casella Insight Data Management
Software to set these details and transfer them to the instrument – you
cannot set them by using the instrument’s controls.
17 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
Status
Following a short delay after switch on, the Status screen is displayed. This
read-only screen shows the status of some instrument settings. Press the Exit
soft key to close the Status screen and to show the instrument’s measurement
screens in Stop mode (which means there is no measurement Run in progress).
The measurement screens in Stop mode have red bars at the top and bottom.
You can also access the instrument’s Status screen by selecting the
Instrument Status icon in the Settings screen, and pressing the Select soft
key. See the example screens in Figure 5.
Figure 5 Status screen
If the instrument has recorded a measurement Run since it was switched on,
the measurement screen will show the average and maximum readings from
that Run. Otherwise, the data fields will be null:- ‘---.-‘.
18 Casella Measurement
CEL-712 Microdust Pro Real-time Dust Monitor
IMPORTANT
Press the Menu soft key from a measurement screen in Stop mode to use the
instrument’s settings screens as instructed below.
System tools
If you simultaneously press the left and right navigation keys at power up,
the instrument displays the System Tools screen.
Figure 6 System Tools screen
The System Tools screen should only be used for diagnostics or to configure
the instrument for specialised applications. This screen allows you to do the
following:-
Reformat the internal memory. (This will delete any measurement
results or corrupt files saved in memory)
Set the serial data communication rate.
Read the instruments internal Span and Zero calibration settings. These
may be used for fault diagnosis purposes
Reset the calibration values. This sets the internal span factor to 1.0 and
Offset value to Zero. It is useful to restore these values during fault
diagnosis. After restoring the default values and with the probe in a
clean air condition, the displayed concentration should typically be <0.7
mg/m3. Higher values may suggest probe contamination.
Enable ‘Online’ mode. This is used in telemetry and specialised data
logging applications. The instrument automatically starts a data logging
Run when powered and provides RS232 serial interfacing of
measurements to other products. A cable, part number 206094B
19 Casella Measurement
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