Indoor Aerosol Monitoring Equipment.
SPECIFICATIONS FOR MS&T AREA SAMPLER Rev: 06-17-00
Introduction / Application
The main intent of the standard configuration of the sampler is for
area assessment of indoor particles utilizing a 37 mm filter and standard
Anderson type dichotomous sampler filter holder rings. Although it is
not a designated US EPA Federal Reference Method (FRM) sampler because
it has not be wind tunnel tested, many researchers often utilize the
sampler for outdoor use when a FRM sampler is not required. A primary
goal of the sampler design is uniform deposition of material on a 37
mm filter such that Beta Gauging and elemental analysis of the deposited
material utilizing X-ray Fluorescence Analysis is facilitated. The high
sampling rates that are available allow, standard micro-balance gravimetric
techniques to be utilized in non-industrial environments for sampling
periods as short as 4 hours. Currently, standard flows of 4, 10, or
20 Liters/Min. are available.
Additional goals of the pumping and control unit design included suitability for very quiet indoor
sampling, and the ability to run the sampler from a back-up 12 volt power source such as a gel-cell type
battery or automotive supply jack.
The sampler is a two part configuration i.e. the sampling inlet and
filter holder/impactor are separate from the programmable, flow controlled
pumping unit, connected by a hose. This allows the inlet assembly and
filter holder to be easily changed or serviced as a unit. It also allows
the pumping unit to be located indoors for security or protection from
the elements when the sampling head is utilized for both indoors and
outdoors. If the pump is used outdoor in above freezing weather, protections
from the elements must be provided.
Flow Rates and Impactor Size Cut
(1.0, 2.5, 10.0 micron size cuts available)
(PM)-1 , (PM)- 2.5, (PM )-10 and total dusts
There are currently interchangeable impactor nozzles available for standard flow rates of 4, 10, and 20 LPM
designed to provide suitable Respirable, Inhaleable, or Breathable size cuts over the flow range of 2 to 20
LPM, allowing versatility of the impactor.
MS&T AREA SAMPLER SPECIFICATIONS CONTINUED
These nozzle sizes have been tested with solid particle aerosols by
University of Minnesota researchers, and compared to other samplers.
Reference professional publications are available concerning various
comparisons published since 1985.
The current six (6) different nozzles provide a sharp 50% size cut at 2.5 microns (Fine Fraction) and 10
microns (Inhalebale Fraction) at standard flows 4, 10, or 20 LPM.
Based on the test data generated in evaluations to date, the same 4 LPM nozzles are calculated to provide a
sharp 50% cut off at 3.5 and 15 microns respectively at a flow rate of 2 LPM.
Similar performance is expected for the 10 and 20 LPM nozzles. Thus, the 2.5 micron 20 LPM nozzle is
calculated to cut at 3.5 microns a flow rate of 10 LPM. Other flow rates can be evaluated or designed for
A 1.0 micron cut has recently been calibrated from a stacked pair of
nozzles at 23 LPM and is in limited use primarily in Europe.
Standard Size Fractionation:
(PM) -2.5 Fine fraction 2.5 micro meters + - 10%; 50% cutpoint
(PM ) -10.0 Course fraction 10.0 micro meters + - 10%; 50% cutpoint
Sample Deposition: Sample deposited in a strictly uniform manner suitable for automated XRF
analysis, Beta Gauging, and gravimetric operations. Uniform deposit is defined as: deposit density per cm
squared of the filter shall not exceed + - 10% of the average deposit of the filter.
Filter Media: Sampler has been utilized with 37 mm Teflon membrane
filters (with support ring), glass fiber filters and polycarbonate filters.
All generally utilized with an "Anderson" type dichotomous
sampler ring and Whatman "drain disk" support pad to prevent
blow out at high loading and high flow rates.
MS&T AREA SAMPLER SPECIFICATIONS CONTINUED
Pumping and Control Unit
Power requirements: 110-130 VAC, 50/60
Hertz, (240 volts optional, nominal extra), up to 30 watts dependent
upon load, 12 VDC back up from external source built in option
Control: Volume based flow controlled over the range of 4 to
28 LPM, temp. and pressure compensated, continuous adjustment, maximum
pressure drop in the range of 80 inches of water column at flows up
to 20 LPM, 50 inches at 23 LPM and 20 inches at 28 LPM. Continuously
adjustable via 10 turn lockable potentiometer. Total elapsed time meter,
and programmable 1 week timer in two hour increments (82 set points),
with battery back up clock. Optional 24 hour timer, or 7 day digital
timer nominal extra or $50.00 US.
Pump: Vibrating diaphragm pump for reduced pulsation. Oiless,
maintenance free design. Expected and proven life in normal service
between service 3,000 to 5,000 hours of operation at 10 LPM at 50 inches
Noise Level: "Very quiet",
suitable for office or residential use. < 55 dbA at one meter, at
up to 60 inches vacuum.
Indoor Sound Dampening Case Size: 18" x 10" x 14"
nominal, with small plastic internal case for Impactor/Accessory storage
inside of the sound box during transport.
Weight: Less than 28 lb. Complete with indoor sound dampening case,
with impactor stored inside case.
Warranty: Two year against defective parts for impactor. Ninety
day against defective parts for the pumping and control unit in normal
Sample Standard Operating Procedures: The use and operation of the
Impactor will vary dependent upon the type of sampling being conducted.
A sample S.O.P. can be downloaded here (111kb download).
Please checkmark the desired items and indicate the
Standard Costs: ( US dollars) email for Quotation
Email for quantity pricing on items: 9,10,11
Note: Quantity discounts available for impactor quantities greater
than 2 units with prepayment or Bank Payment Guarantee within 10 days:
Standard Impactor Discounts with Prepayment:
2-5 units - 15%, 6-10 units -20%, 11-24 units -30%, 25- 45 units -35%,
+ 45 units -40%
Delivery: typically 4 weeks, depending on stock at time of order.
Address all correspondence to: William A.
Air Diagnostics & Engineering Inc.
110 Alpine Village Rd. Harrison, ME. 04040 USA.
Phone 603-496-3942 or Fax 207-583-4572
Notice: Specifications and Pricing Subject To Change Without Notice
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