The 4300-PG controller monitors and controls gases in
the workplace. In addition to the many industry standard monitoring and control functions, the 4300-PG
has onboard data logging of events and alarm run-time. The user can
also set two automatic fan cycle periods a day to purge and ventilate
the air. Multiple wiring runs and cross=mapping of sensor alarms simpli-fies installation.— Arjay Engineering Ltd., 905/829-2418,
www.skitternet.com Circle 52 on Card
Hydrogen Sulfide Analyzers
A number of municipalities are currently using the
Jerome® hydrogen sulfide analyzers for in-plant surveys, scrubber efficiency testing and source monitoring (10-50 ppm). Jerome® analyzers are capable of
detecting hydrogen sulfide in parts-per-billion concentrations, and used for initial site characterizations and for regular monitoring of hydrogen sulfide levels. — Arizona Instrument LLC,
800/528-7411, www.azic.com Circle 53 on Card
Indoor Air Quality Monitor
The portable AQ Expert provides monitoring and real-time data logging for IAQ testing. The AQ Expert
includes up to 11 customizable parameters, It meau-res CO2, CO, RH, Temp, VOC, O2, NO2, ozone, SO2,
H2S, and Barometric Air Pressure. PC Software, USB, and Bluetooth® are
included. Designed and made in the USA, it has an active internal sampling pump. — E Instruments International, 215/750-1212,
www.E-Inst.com Circle 54 on Card
I recently sat down for an interview with Robert Gussman the man behind the
Cyclone sampler and owner of BGI Inc., headquartered in Waltham, Massachusetts,
to discuss the 25th anniversary of Cyclone development at the company. This technology has become an industry standard for particle monitoring in both the air pollution control and industrial hygiene markets for particle measurement generally in the
1 to 10 micrometer range.
The Cyclone started out very casual while Mr. Gussman was acquainted with round
entry cyclones from his Co-op student days working at Harvard while attending
Northeastern University. Then in the 1970’s Southern Research Institute made some
round entry cyclones for stack sampling. Robert Gussman was curious and built several of them and took them to a scientific meeting. This is where Dr. Lee Kenny of
the Health and Safety Laboratory in Sheffield, UK posed the question to Bob; had he
ever calibrated the device? Because of the complexity and the length of time it would
take to calibrate the device, Mr. Gussman stated that he had not. Mr. Gussman was
then invited by Dr. Lee Kenny to come to her laboratory where she showed Mr.
Gussman how to calibrate the cyclone in one afternoon. He spent the next 15 years
collaborating with Dr. Lee Kenny and they published a number of scientific papers.
The U.S. EPA then came out with the PM- 2. 5 regulation in 1996, although the U.S.
EPA specified using a well-type Impactor to do the work. This so-called “WINS
Impactor” experienced a number of issues during deployment in the national fine
particle monitoring network. In a group project that included Mike Meyer (from the
former R&P Company and now Director of Marketing & Technology at BGI), Lee
Kenny, and Bob Gussman, they set out to design a better particle size fractionator to
sample at the PM- 2. 5 level. They came up with the Sharp Cut Cyclone (“SCC™”)
device which the U.S. EPA said was not up to their standard. Out of his own professed stubbornness, Mr. Gussman continued with the project and developed the Very
Sharp Cut Cyclone (“VSCC™”) device.
After additional evaluation by the EPA they made it an equivalent standard and in a
later upgrade of the standard, they made it a reference standard. This has made the
VSCC particle size fractionator the national standard which now is used all over the
If you do PM- 2. 5 measurements then this VSCC is usually your first choice in sampling configuration.
BGI Inc. was started with the purpose of developing and manufacturing instruments
for sampling of airborne particulates – aerosols. The sampling range that interested
them most was the submicron fraction (using the Pollak nuclei counter) to 100
micrometer (high volume sampler). This sampling technology was primarily used in
the industrial hygiene market for personal exposure monitoring and the air pollution
control market to measure ambient particulate pollution, aerosol generation and toxicology.
The latest advance concerning the Cyclone technology is based upon the development of the Cyclone for PM -1 measurement in 2000. The Diesel Cyclone (SCC
0.695) design is centered on a particulate cut point (D50) of 800 nm (0.8 μm) for the
specific target of Diesel soot. Its flow rate is 2. 2 lpm, which has been established as
the prime flow rate in mining applications for personal sampling. The company is
also in the process of developing this technology to go on an automatic sampler to be
used in the mining industry.
Additionally the Cyclone technology has found a niche in the mining, oil/gas drilling
industries with the GK™ 4.165 RASCAL (Respirable Air Sampling Cyclone
Aluminum Large). This sampler was developed under a contract supported by the
National Institute for Occupational Safety and Health (NIOSH) and tested at the
Health and Safety Laboratory with the evaluation done by Andrew Thorpe in the UK.
It was developed as a dual use cyclone for use in sampling Respirable and Thoracic
dust fractions. It has been used as a high flow rate respirable sampler for silica,
which has become an area of concern as stated by NIOSH because of its association
with silicosis, an irreversible but preventable disease.
For more information visit www.bgiusa.com or phone 781/891-9380
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