HomeMy WebLinkAboutParticle Counters For Filter Plant
Augusta Richmond GA
DOCUMENT NAME: lli,<-nde.- Co.J.,\\,e,ys fo'(-h\\-e'( ~o..(\-\-
DOCUMENT TYPE: ~a.& \
YEAR: C\B
BOX NUMBER: CJ.-\
FILE NUMBER: \~5lq
NUMBER OF PAGES: c9l
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UTILITIES DEPARTMEN
N. MAX H'CK;S, PI!:, DIRECTOR
2760 pl!AeH OIlCHARP ROA.D
AUGUSTA, GA 30906
(706) n~a..s<?~~ - PAX (706) 771-2646
TOM D. WIKtlMEIER, PE, "'-BSISTANT DIRECTOR
AGENDA ITEM
PnwI1STJ
.,yp .FEB 19 ~ ~
AUGUSTAoRICHMCND cOONlv .
ADM~TOR"S oFACE
TO:
FROM:
DA 1E: March 9, 1998 (February 18, 1998)
SUBJECT: Contract for Particle Counter:s for Filter Plant
CAPTION: Award Contract for Particle Counter:s for Filter Plant to Met
One ~t Low Bid of $77,910.37
BACKGROUND: Particle counters are used to demonstrate the effective removal
of cyst~size particles from drinking water. A particle sensor
samples the water before it passes through the filter and
another sensor samples the water after it pass~ through the
filters. Thus, two particle sensors are needed for each of the
10 filter for a total of 20. We are proposing to purchase 24
sensors as part of the new system so that we will have spares
on hand. We are required to demonstrate a, minimum removal
of 99.5% of the cyst"5lze particles to be in compliance with
EP A requirements. This new system will repiace the existing
outdated equipment that is now used to monitor one filter and
the total plant output. With the new system we can monitor
each filter to provide maximum protection to .our water
customers and assure compliance with the EPA requirements.
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AGENDA ITEM
March 9, 1998 (February 18, t 998)
Page 2
ANALYSIS: This new particle counting system is essential in
providing maximum protection to our water customers
and in maintaining compliance with EP A regulations. 8y
monitoring each filter we can immediately detect and
isolate any.problem situation and then take more
precise corrective action.
FINANCIAL IMPACT: The Initial bnpact will be the $17,910.37 purchase
price. There. will be a fee of $5,000 per year for sensor
calibration in subsequent years.
At TERNA TIVES: There are no reasonable alternatives.
RECOMMENDA liON: . We recommend awarding the contract for particJe
counters for the filter plant to Met One for their low
bid price of $77,910.37.
~
FUNDS AVAILABLE ON THE
FOLLOWING ACCOUNTS:
61-4416~..0878
Mise, Caoital
g~tA~iNT d 4<>f U.
COUNTY ..
ADMINISTRATOR: ~ "12-.~ 1-/~"N
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Augusta-Richmond Utilities Department
Operations Division
2822 CENTRAL AVENUE
AUGUSTA. GEORGIA 30906
(706)736-8497 FAX(706)733-7825
Date: 2 -6 -9 P
Please Deliver The Following Transmittal To:
NAME:
.
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DEPARTMENT: ~ ~
FAX NUMBER: (~C/..I) '1- ?7-3oV")
FROM: ~".j~.~L~
This is page 1 of '"\..----'Pages, If you do not receive a"1I ofthese pages or they are unclear,
please call (706) 736-8497 or transmit. your reply to our Fax Number (706) 733-7825,
NOTES;
B EK -10/22/96
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.0 Met One
A Subsidiary of Pacific Scientific Co.
411 CalIfomta AftmIe. Gmds Pus. OR 81526
ptt: (&41) 47'-1248 FAX: (641) 41'9-3057
Date:
February 9, 1998
TO: Brantley Kuglar
Company: Augusta-Richmond Utilities Dept
FAX:
706-733-7825
FROM:
Curt Collins, En 131
E~: h~da.A4.net
RE:
Per your request
~
Thank you for the opportunity to explain, in more detail, the services to be
provided by Met One as part of this particle counting system purchase.
Met One will schedule a pre-installation site visit within two weeks prior to
shipment. At that time, Met One personnel will meet with the appropriate people
at Augusta to advise site location in the pipe gallery of the particle counters, as
well as proper routing for the communication cabling. Met One personnel will
always be available to answer any questions that may arise concerning the
instaIJation and use of the particle counters.
In preparation for shipment, the units will be factory calibrated, per ASTM F 658,
and a certification of calibration shaH be issued for each unit. In addition, a
sensor-ta-sensor variance test will be perfonned using a industry procedure. A
system count-match certification will be issued and all sensors will match to
better than :t:5%. .
The particle counters will be installed by Augusta County personnel. This is
typical and historically has been performed in over 99% of our installations in the
United States and the State of Georgia. Upon the completion of the physical
installation of the counters,arld based upon previous advisement by the
continued.. ..
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AUGUSTA-RICHMOND UTILITIES DEPT
February 9,1998
Page 2
Met One technician on both the electrical as well as hydraulics, the Met One
technician will return to the job site to complete the installation (i.e., electrical
terminations. checking the water flow throughout the sensors. and adjusting to
meet specifications); and hardware and software training.
Each training session is customized for our particular customer based upon a
planning meeting where it is determined who will be present, and to what degree
the training should entail. Typically, the training is broken into three categories:
1) Particle counter theory, that is, explaining to plant personnel how and why
particle counters work.
If you have any additional questions, please feel free to call my~elf here at the
factory, (541) 479-1248, or Barry Kitchener, in our regional office (919) 833-
~O. :
Curt Collins .
Liquid Products Manager
Idb
** TOTAL PAGE.002 **
UTILITIES DEPARTMENT
BRANTLEY KUGLAR, SUPERINTENDENT
2822 CENTRAL AVENUE
AUGUSTA, GEORGIA 30909
(706),736-8497 - FAX (706) 733-7825
WATER PRODUCTION DIVISION
February 6, 1998
Curt Collins
Met One, Inc.
481 California Avenue
Grants Pass, OR 97526
Dear Curt,
I am in the process of reviewing the Particle Counter bids and we will be making our decision
very soon. I would appreciate it very much if you could elaborate a little more on the Systems
Lists that was included in your bid price. Does this price include ~y installation of the sensors,
calibrations of them, what is involved in the startup, testing and training?
If you can fax this to me, I sure would appreciate it and hopefully we can make a decision very
soon.
Yours Truly,
Brantley Kuglar
*******r******* -COMM.JOURNAL- ******************** DATE FEB-05-1998 ***** TIME 10:08 *** P.01
MODE
TRANSM I SS I Ol'-J
START=FEB-05 10:07
END=FEB-05 10:08
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COM
ABBR/NTWK
STAT! Ot"j NAME/
TELEPHONE No.
PAGES
PRG.l'-JO.
PROGRAM NAt'lE
001
OK
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15414793057
002
-AUG RICHMOl'-JD CO.
************************************ -WATER WORKS OPER- ***** -
1 705 733 7825- *********
PROPOSED SYSTEM
for
AUGUST A-RICHMOND
UTILITIES DEPT.
~
MET ONE, INC.
481 California Avenue
Grants Pass, OR 97526 USA
Tel: 541 479-1248 FAX: 541 479-3057
o Met One
A Subsidiary of Pacific Scientific Company
Geri A. Sams
THE AUGUST A-RICBMOND
PURCHASING DEPARTMENT
530 Greene Street - Room 605
Augusta, GA 30911
RE: Bid Item #97-102A
Liquid Particle Counting System for
Augusta-Richmond Utilities 'Dept.
Opens December 30, 1997 @ II :00 a.m.
Reference Met One Quotation #3044
Dear Sirs,
481 California Avenue
Grants Pass, Oregon 97526
(541) 479-1248
FAX (541) 479-3057
Thank you for the opportunity to propose Met One products to meet the AUGUST A-
RICHMOND UTILITIES DEPT.'s particle counting requirements. I have reviewed the
published specifications and have prepared the enclosed proposal.
,
I would like to take a few moments to discuss the type of company Met One is and what
we have accomplished so as to demonstrate the performance you can expect. Met One
has been manufacturing particle counting instrumentation since 1979. Particle counting is
our only business. Our particle counters are used in many different industries throughout
the world. Met One has been committed to the water treatment industry since 1987 and
has the largest installed base of particle cOUI~ting systems used for this important
application. Met One is also the first particle counting company to develop a sensor
specifically for the unique needs of this industry.
Met One is located in the Pacific Northwest, in Grants Pass, OR. We employ 170 full-
time people, among them an engineering staff of 29, an 2 I-member customer service
department and five people dedicated to providing information and phone support on
drinking water applications.
.....
AUGUSTA-RICHMOND UTILITIES DEPT.
Bid Item #97-I02A
Met One maintains regional service centers throughout the country, staffed by factory
trained Met One employees. Your service would be provided at our Charlotte, NC
location. Sensor calibrations are performed using traceable polystyrene latex spheres,
from Duke Scientific, per ASTM F 658.
I would like to emphasize some of the significant advantages of the Met One systems.
Please consider these as you evaluate the other proposals you have received.
Volumetric Sensor The Met One sensor illuminates the entire cross-section of the
sample flow. All particles passing through the Met One sensor pass through the sensing
area. Some other companies use partial stream illumination ( sometimes referred to as in
situ). In this method, the laser beam is focused on a fraction of the flow path, (as little as
,
12%). This assumes that particles, of all sizes, are uniformly distributed throughout the
sample stream. Twists and turns in the sample line can create eddies or a centrifuge effect
which can skew the distribution of particles within the stream. A particle which partially
passes through the beam will be missized or possibly not counted at all. The end result is
a particle count which may not be truly rt7presentative of actual conditions.
Size ~esolution This refers to the particle counters ability to size particles accurately.
The ability to size and count individual particles is the advantage of particle counting
over turbidity. The resolution requirements for particle counters and the procedure for
determining it is detailed in United States Pharmacopoeia (USP) #788, an industry
standard. It states that resolution shall be better than 10% at 10 microns. SOThe
companies' size resolution can be 20% or more at 10 microns. What this means is that a
10 micron particle can be counted .and measured as anywhere from an 8 to 12 microns.
The Met One Model PCX has size resolution of3% at 10 microns. A 10 micron particle
. passing through the Model pex will be counted within 9.7 to 10.3.
AUGUSTA-RICHMOND UTILITIES DEPT.
Bid Item #97-102A
Sensor Count Matching The matching of particle counters is indicative of their
performance and consistency of manufacture. I've enclosed a example of a recent count
variance certification.
Field Replaceable Flow Cell The flow cell is the area of highest con.cern because it is
the portion of the particle counter which requires routine maintenance. Compounds such
as potassium permanganate and calcium carbonate, commonly found in water treatment,
can stain or deposit on sensor optics. A simple, routine brush cleaning will normally keep
this in check. On some occasions, though, a chemical cleaning may be required. With the
Met One system, this can be accomplished, outside the sensor, by swapping the cell. In
othe~ systems the particle counter must be taken off-line to perform this cleaning.
Protective Enclosure The Met One sensor is housed entirely~in its protective NEMA
4X enclosure. Some other companies leave their flow cell portion, where the actual
counting takes place, external of its enclosure. Here it is potentially exposed to
temperature changes, electrical noise, or accidental damage. This would not meet your
specification
Sensor I/O ~ach Model pex includes an analog I/O option which enables it to transmit
(4) 4-20mA outputs, proportional to particle counts, and accept (8) analog inputs from
other devices.
I
Met One has a proven track record of manufacturing, developing, servicing and
supporting particle counting instrumentation. Met One has a similar system installed at
BEAUFORT JASPER WSA as well as being the selected vendor for the cities of
COLUMBIA and CAMDEN local to you. When you consider all the facts I am confident
that you will agree that Met One is established and positioned to provide the best and
most responsive level of support to the AUGUST A-RICHMOND UTILITIES DEPT..
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1
[
AUGUSTA-RICHMOND UTILITIES DEPT.
Bid Item #97-I02A
Met One has a long and successful history of providing particle counting systems to the
I
water treatment industry. We were there at the very inception of this technology into this
industry. Over that time we have made a few mistakes and learned many important
lessons. We feel strongly that we are the most experienced particle counter manufacturer.
The proposed system meets your published specifications with two minor clarifications.
The first is the signal to noise ratio, which is an indication of whether the particle counter
will record false counts as a result of noise. Sufficient signal to noise headroom to
eliminate false counts is all you need, more headroom has no effect on results. The Model
PCX has 2: I signal to noise ratio. The second is that the optical material in the Model
PCX is quartz which is optically superior to sapphire and stands up to routine brush
cleanings. As stated earlier, Met One is a particle counting company and designs
instruments for many different applications, some which use sapphire. We chose quartz
for its advantages to this application. The proof is in the well over 1000 Model PCXs
installed around the country.
As you evaluate this proposal please note the great care we have taken to cover each
detail and clearly communicate our proposal to you. I know you will be confident that
Met One has the product, personnel, and expertise to work hand-in-hand with the
AUGUSTA-RICHMOND UTILITIES DEPT. for a successful project.
If you should have any questions about any of the information presented here please fe~l
free to contact myself, here at the factory (541) 479-1248, or Barry Kitchener, in our
regional office (919) 833-8820.
Thank you,
Curt Collins
Liquid Products Specialist
. I
CONTENTS
Proposal/System List . . . . . . . .... . . . . . . . . . . . ... . . . .. . ... .. : . .. 1
System Specification
Qualifications and Experience ............................2
.(
Application Advantages ....................................3
Technical Support and Service ..........................4
Support Documentation ...................................5
BID ITEM #97-102A
Liquid Particle Counting System for Augusta-Richmond
Utilities Department
BID DATE:
11:00 A,M" Tuesday, December 30,1997
The system computer shall be IBM compatible and must support collection, storage, and printing
of data for 24 sensors.
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The system shall consist of liquid borne particle counters utilizing laser illumination, light extinction,
technology with all hardware and software to perform the functions of counting, clas;5ifying,
recording, manipulating and displaying particle data.
The sensors shall detect particles in the 2 to 400 micron size range.
A3 to 1 signal to noise ratio shall be required at 2 microns.
Size thresholds must be selected without interrupting system software or removmg the
sensor/counter from the communications line.
System should be able to void readings during backwash.
A device shall be furnished to insure a sample flow of 100 ml/min constant to sensors.
This device should function without the need of operator attention other than occasional routine
maintenance.
This device should also eliminate or reduce bubbles.
Each sensor shall be encased in a NEMA 4x rated enclosure such that water cannot enter the
electronics.
A means of electronically and audibly enunciating a low sample flow condition and cell conditions
shall be provided.
rhe sensor optical window shall be constructed of sapphire, with "quick disconnect" fittings.
!
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Particle counter system shall have ligl)tning, surge, and spike protection and counters must be
located at least 1000 feet from compute~.
!
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Entire particle monitoring system shou11 be easy to understand and operate by staff having limited
computer knowledge. ~
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. . - I - " I .
- , '. - -. I .
BID ITEM #97-102A
Liquid Particle Counting System for Augusta-Richmond
Utilities Department
BID ~A TE:
11:00 A,M" Tuesday, December 30,1997
GENERAL INFORMATION/SPECIFICATIONS:
1. Delivery will be to:
Augusta-Richmond Utilities Department
2822 Central Avenue .
Augusta, Georgia 30909
2. Bid Quote to be f.o.b.
Utilities Department
Augusta, Georgia 30909
3. If any additional information is needed, please ~ontact:
Tom Evans
(706) 796-5006
4. Successful bidder must have a valid Occupational Ta'( License.
License Number 94-2353743 State Issued . CALIFORNIA
5,
Name
Company MET ONE, INC
Address 481 CALIFORNIA AVENUE
GRANTS PASS, OR 97526
Telephone No. (541) 479-1248
Fa'( No.
(541) 479-3057
Delivery Date: 6 - 8 WEEKS ARO
Mfg. & Model: MET ONE MODEL PCX
TOTAL BID QUOTE: $77 ,910,37
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System List
,
Model
Qty Name/Number Description
24 Model PCX Remote on-line sensor/counter, counts particles 2-700~, eight
size channels (32 channel capable), local display and surge
suppressIOn.
24 AFC- WI Weir flow controller, maintains 100mLlmin flow
2 860471 40-mesh strainer, for pre-filter sample points
24 204839-6 Sensor cleaning kit
1 480908 Dell Computer, minimum specifications (may exceed):
Pentium 166 Mhz, 32MB RAM, 2.0GB HDD, Monitor,
Mouse, Windows 95 t\wo lrJCc..\J ~~ f~'ri.-rdl-
'fliftl- C\J~-r CoL.LI NS i./ US ['1&
I 2082383-2 RS232 to RS485 converter ~
I WQS Vista Water Quality Software
1 NTRNl On-site system start-up, final test, and training *
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ADDENDUM
Communication Cable The bid specification does not mention
communication cable, AUGUSTA-RICHNIOND UTILITIES DEPT may
choose to orde~ it from Met One (part# 400004) and add $0.95 pef'foot
required. If you purchase cable locally, we specify it to be Belden #9841 or
exact equal.
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QUALIFICATIONS & EXPERIENCE
As mentioned in the cover letter, Met One designs, builds and manufactures particle counters for use all
over the world. We have been in the p~rticle counting business since 1979.
At the time of the 1987 Carrollton, GA cryptosporidium outbreak Met One was asked to provide
assistance in the study that followed. We committed equipment and an application engineer to go on-site
for this project Met One was the only particle counter company to respond to this call. Met One has been
committed to, this industry ever since. We have the largest installed customer base of particle counting
systems in water treatment (see our attached listings) and have been used by nearly every major
engineering firm for their pilot studies.
The only particle counting
company, serving the water
treatment industry, which
designs, manufactures, markets
and services the equipment.
Pioneered use of laser diode
technology in particle counting.
The first company to design,
build and market a particle
counting sensor specifically for
use in water treatment.
Selected for the A WW ARF study
surveying water throughout the
country. System "re-installed"
weekly and is highly reliable.
Dedicated Water Group to
support water treatment
customers. Five-man group
including engineering, marketing
and technical personnel.
Use other companies' products or
sub-contract manufacturing and
service or have reps wno plan to
do service. No track record of
product improvement or support.
Followed Met One's lead
Other vendors supplying sensors
designed for industries and
applications (such as hydraulic
fluids and solvents).
Other vendors deemed lesser
qualified or unable to provide
necessary support and required
equipment
Other vendors work primarily
through outside representatives
and may have one person devoted
to water treatment.
One company to deal with.
~et One provides complete after-
sale support. A proven upgrade
path.
Met One has built, and continues
to support, the type of particle
counters in use today longer than I
anyone else.
State of the art equipment Met
One has a ,fully staffed
engineering department to design
and continually improve on
products. Commitment to this
market.
Met One system proves it's
rugge~ness, reliability and
mobility. Data collected in this
important study will be used to
set standards for all water
systems;
Fast, responsive support for your
system. Shared knowledge and
expenence
APPLICATION ADVANTAGES
The system proposed here reflects a number of developments which have come about as a result of our
experience gained in this industry.
The sensor utilizes light "blocking" technology. The light source is a laser diode. Met One pioneered the
use of laser diodes in particle counting sensors. The advantages are its long life, low power, stability and
accuracy. In designing a sensor two conflicting concerns arise, concentration limits and flow rate. For this
application it is important to have high sample flow. High flow maintains particles in suspension and
minimizes particle dropout. Particles which dropout are not counted and the result is an unrepresentative
sampling. High flow also minimizes sedimentation in the sensor's cell that results in less required routine
maintenance. A larger flow cell is required for high flow rates. Concentration limits call for smaller flow
cells to minimize the point at which multiple particles will pass through the beam together. This can result
in partial undercounting and missizing. We have found the optimum balance between these two concerns is
to utilize a flow cell dimensions between 700-850J..l square and a flow rate of 100mL/min.
Met One was also the first particle counter company to use a constant head device for flow control. The.
Model AFC-WI has a large, 1/2", inside diameter and can accept sample in-flow rates in excess of2 Liters
per minute. This high flow also maintains particles in suspension. The large diameter also prevents the air
binding experienced by some smaller, thinner weirs.
Cell size 750J..l X 750J..l
As small as 400J..l X 400J..l and as
large as 1000J..l X 1000J..l
V olumetric sensor, 100% of flow
cross-section sampled.
Some vendors use "in situ" design
which only looks at a fraction of
the flow cross-section. This
provides higher flow while
sacrificing size-resolution and
count accuracy.
Have not offered this as a standard
feature of their system. Ask for
proof of capability.
Sensors. count matched at the
factory to within +/- 10% of
system standard sensor
High sample flow into flow
controller
Smaller, shorter, thinner weirs
Brush cleanable
Manufacturer with 400 X 400
micron cell supplies a wire.
Met One flow cell optimized
tpr high flow and high
concentration capability
The Met One sensor design is
the best suited for the
application.
All sensors count alike. Data
can be accurately compared.
Particles maintained in
suspension better. Provides a
more representative and
accurate sample
We include a brush. The entire
procedure takes less than a
minute and does not require
breaching the integrity of the
NEMA 4X.
..
TECHNICAL SUPPORT & SERVICE
Particle counters require little maintenance except for periodic cell cleaning. The frequency of cleaning
depends largely on each individual plant's water and seasonal changes. The screen in the strainer also
needs to be cleaned periodically. Most people start with weekly screen cleanings arid monthly sensor
cleaning. They adjust this schedule as conditions allow.
Met One recommends an annual calibration and the cost for this service is $250 per sensor (when
------
performed at the factory or field service center). Your local service center is located in Charlotte, NC
phone # (704) 587-0939. We offer several options to perform this service. You may send the sensors here
to the service center, where there is a 72-hour turn-around guarantee (or the calibration service is
performed at no charge). You can choose to have a factory service technician come on-site and calibrate
all of the sensors. Met One also offers a "zero downtime" program, enrolling in this provides you with one
or more loaner sensors to use while an equal number of yours is in for service. With this you can cycle
through all of the sensors in your system.
If you should ever need any phone support for hardware or software questions you may call our factory
customer service line, (800) 866-8854.
FACTORY SERVICE LOCATION
FIELD SERVICE LOCATION
FACTORY SERVICE
481 California Ave
Grants Pass, OR 97526
John Moir, Mgr.
(800) 866-8854
Fax (541) 479-3057
SOUTHEAST SERVICE CENTER
130 I 0 Pecan Meadow Ct.
Charlotte, NC 28278
Leonard Formanek, Sr. Tech.
(704) 587-0939
KEY PERSONNEL
Barry Kitchener
Terry Engelhardt
Southeast Regional Sales Mgr.
Dir. of Sales, Drinking Water
(919) 833-8820
(970) 493-5470
Factory - (541) 479-1248
Curt Collins
John Hunt
Craig West
Eduardo Tanco-Benitez
Tim Rivas
Liquid Products Group Mgr.
OW Applications Engineer
Cust. Srvc Systems Engineer
Cust. Srvc, Software Support
Software Products Mgr.
ext. 13 I
ext. 134
ext. 262
ext. 261
ext. 115
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Particle Countine:
Volumetric vs. Partial Stream Illumination
Particle counting has become an important tool in drinking water treatment. The reason that it is rapidly
replacing turbidity as the predominant process measurement is the instrument's ability to discriminate
between different size particles and show subtle changes in the particle size distribution. Another
significant advantage is a particle counters ability to be sensitive to only a few or even a single particle.
Turbidimeters lose particles in the noise at low contamination levels.
When designing a particle counting sensor there are several considerations to be made. Among them are:
. What sensitivity (smallest size counted) that is required for the application?
. What dynamic range (largest particle sized) that is'required?
. What is the anticipated particle concentration?
. What is the importance of sizing accuracy?
. How often will cleaning be required and what shape cell will allow for easiest cleaning?
The choices made for each of these can affect the others. Trade-offs must be weighed to finalize on a
design which best meets the goals of the application.
Several years ago a technique was developed to focus the light beam intensity on a small percentage of the
flow path to increase particle size sensitivity. This is also often referred to as in situ. In some applications,
such as semiconductor, sensitivity is more important than almost all other parameters. In this type of
application the goal is to quantify total contamination larger than a critical, "killer" size because product
yield is dependent on low counts. In DI water applications the particles tend to be made up of only a few
materials, are small in size, and very few in number. In a water treathtent application, partial stream.
illumination has the advantage of allowing a larger cell for easy cleaning~yet still claim a high
concentration limit because the view vol~me is so small.
Partial Stream Illumination
This particle
not counted
at all
This particle,
partly in the
beam, will be
sized smaller
or not counted
at all.
Usi~g partial stream illumination, the particles are assumed to be uniformly distributed throughout the
flow. This assumption could be very wrong when applied to drinking water treatment. Comparatively,
there are more particles over a wider size range. Bends and turns in the sample line can create eddies or a
centrifuge effect which can place a disproportionate number of particles in areas of the sample flow. Any
particle which passes through the dimly lit outer edge of the beam will be sized smaller or not counted at
all.
Particle Counting:
Volumetric vs. Partial Stream Illumination
1
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Many particle counting sensors are designed to be volumetric, which is to 'say that the entire cross-section
of the flow path is illuminated:
Volumetric
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All particles pass
through the beam
In this design, all particles pass through the beam and are counted, providing a more representative
sampling. You are not missing certain sized particles which may tend to remain in the outer edge of the
flow. By eli,minating the percentage of particles which pass through the beam edge, in a partial stream
illumination sensor, size resolution improves and the collected data. becomes more accurate and
repeatable.
With years of experience to draw fr?m, Met One identified the most in;tportant 'needs of particle counting
for water treatment as:
~
\. Size Discrimination. The.ability to accurately count and catgorize particles indiscrete size ranges.
This enables the operator to assess filtration efficiency for various sizes of particles, including those in
the size ran'ge where you would find waterborne microbials. .
2. Repeatability. The counters need to count within a tight tolerance of one another so that data taken
from one point in a plant is directly relatable to data taken from another point.
3. Easy and Infrequent Need for Maintainence. All particle counters are subject to, over time,
deposits, sedimentation, and staining of optics. A routine schedule of maintainence cleaning is .
required. The success of this schedule is dependent on the procedure being simple and quick, as well
as the need should be infrequent.
The Met One volumetric drinking water sensor achieves all of these goals. The size resolution of the
sensor is measured at <3% by United States Pharmacopia methods (USP 788). Repeatability is certified to
be::!: I 0% by an industry specified procedure using ACFTD. The sensor is brush cleanable, in less than a
minute, without openin~ the NEMA enclosure.
Particle Counting:
Volumetric vs. Partial Stream Illumination
2
Model PCC/PCX
On-Line Particle Counting System For Drinking Water Treatment
. .
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,
PCX Remote Particle Counting Sensor
PCC (Particle Counter Controller)
. Display particle counts and log
removal in six field-programmable
size ranges,
. Up to 16 particle counting
sensors can be connected to a
display,
. Store data-counts and analog
signals from other devices
(turbidity, pH, etc,~for several
days at the interval you need,
. Utility software import data to
popular spreadsheet programs,
System connects to computer
data acquisition system,
Met One
A Subsidiary of Pacific Scientific Company
~
MONITORING THE EFFICIENCY of your filtration process has
never been easier or more affordable. Early detection of filter
breakthrough. optimization of chemical dosages, monitoring backwash
cycles. and demonstrating efficiencies of high-rated filters are only a few
of the immediate uses for Met One's particle counting system.
The Met One system will automatically count. display. alarm. and
store information from up to 16 remotely located sensors (Model PCX).
Particle count and "removal" information is displayed in six size ranges.
which can be easily programmed in the field. These size ranges can be
set up based on state or federal regulations. or based on the size ranges
corresponding to Giardia or Cryptosporidiwn. The system also ties in
other information including analog signals representing turbidity.
sample flow rate, pH, and more.
Along with displaying real-time data. the syste~ stores all data for
several days. At your convenience. a computer may be connected to off-
load data for use with a popular spreadsheet or reporting program. Or.
the system may be permanently connected to a Met One data acquisi-
tion system. which offers real-time trending, alarming. automatic
reporting. data storage, and more.
(.'~
.'
Portable Computer
Particle Counter Controller
(Display, store, analog inputs)
PCCIPCX r La
-If
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~.~
PCX Remote Sensors
(location '0' = influent;
location 1-15 = effluent)
May be used to unload data stored in PCC
using UUS utility software.(On-line computer
monitoring options are also available.)
Specifications
Model PCX Remote Particle Counting Sensor
Smallest Particle Counted 2 microns
Largest Particle Counted
Recommended Sample
Flow Rate
Maximum Sample Pressure
(entering sensor)
Front Panel Indicators
Power Requirements
Communications
Ambient Conditions
Enclosure, Sensor
Enclosure, Power Supply
Weight, Net
up to 7S0 microns (sizing up to SO 11m)
100mUminute
100 psig
power, particle/alann,calibration status
power supply/wall plug module converts
AC line power to low-voltage DC for
sensor operation; IISV ACSO/60 Hz,
optional 230V AC, SO/60 Hz.
RS48S serial std.
sensor; 32-1220F (O-SOOC)
power supply; 32-140oF (0-60oC)
NEMA 4X. wall mount (optional)
11.0" (H) x 9.0" (W) x 6.7" (D)
NEMA 4X. wall mount
7.0" (H) x 7.0" (W) x 6.7" (D)
Model PCC, Particle Counter Controller/ LCD Display
Display 3.0" (H) x S.3" (W)
7.4Ibs. (Sensor); 3.8 lbs. (Power Supply)
Information Displayed
No. of Sensors/PCC
Max. Sensor-To-PCC
Distance
LCD screen shows the following data for
each sensor location: Counts/mL (six
size ranges); particle "log" removal (all
ranges); counting and alann status;
analog input values (in engineering
units); time/date
up to 16 (location "0" is innuent. all
others efnuent)
4000 fl.
Memory Storage
3,000 Records (I record per count cycle
per sensor)
Analog Inputs
one for each sensor location (up to 16);
O-IOvdc full scale; display is scaled in
engineering units (pH, NTU. etc.) analog
inputs used by PCC only. WQS software
uses analog inputs on sensors.
Communications
RS232 or RS48S (9600 baud, no parity,
I stop bit) for communication to
computer
Power Requirem91ts
liS V AC, SO/60 Hz; optional 230 V AC,
SO/60 Hz.
Enclosure
NEMA 4X, wall mount;
10.5" (H) x 8.S" (W) x 6.S" (D)
8.0Ibs.
Weight, Net
Ordering Information
PCCIPCX Starter System
includes PCC. PCX (2), AFC-MI flow
controllers (2). 40-mesh screen. utility
software
Model PCC
particle counter controllerlLCD display
(specify IISV AC or 230V AC power)
Model PCX remote particle counting sensor (specify
IlSV AC or 230V AC power)
208 I 33S-1 water weir flow controller
6190 automatic/electronic flow controller
Universal Utility Software ofnoads and converts stored data into
format used by common spreadsheets
(*.csv)
400004
2081771
40-mesh screen/strainer
Specifications subject to change without notice
o Met One 481 California Avenue, Grants Pass, Oregon 97526. (541) 479-1248. FAX (541) 479-3057
A Subsidiary of Pacific Scientific Company
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