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Jerome
431-X Mercury Vapor Analyzer |
The
Jerome 431-X mercury vapor analyzer uses a patented
gold film sensor for accurate detection and
measurement of toxic mercury vapor in the air.
This portable hand-held unit can easily be carried
to locations with mercury concerns for applications
such as industrial hygiene monitoring, mercury
spill clean up and mercury exclusion testing.
Simple, push-button operations allows users
to measure mercury levels from 0.003 to 0.999
mg/m3 in just seconds. The gold film sensor
is inherently stable and selective to mercury,
eliminating interferences common to ultraviolet
analyzers, such as water vapor and hydrocarbons.
When the sample cycle is activated, the internal
pump in the 431-X draws a precise volume of
air over the sensor. Mercury in the sample is
adsorbed and integrated by the sensor, registering
it as proportional change in electrical resistance.
The instrument computes the concentration of
mercury in milligrams per cubic meter or nanograms,
and displays the final result in the LCD readout.
An improved film regeneration circuit in the
431-X makes the sensor last even longer than
earlier models.
Additional
accessories are available to customize the Jerome
431-X to meet individual application needs.
An optional communications configuration allows
data logging, computer interface, and dosimeter
analysis capabilities. For data acquisition
during portable surveys, a Jerome data logger
plugs into the 431-X. Using the Jerome Communications
Interface (JCI) software, the analyzer and data
logger download recorded data to the computer
for analysis, printout, and permanent record
storage. The JCI software can also program the
instrument for stand-alone monitoring. If the
sensor becomes saturated while the 431-X is
attached to the data logger or computer, the
analyzer automatically regenerates the sensor
and then resumes sampling. Jerome gold coil
dosimeters, used in conjunction with a low-flow
pump and a communications-configured 431-X,
can provide time-weighted averages for personal
mercury exposure. Analysis is quickly performed
in-house with these reusable dosimeters. They
can also be used as collection devices for applications
such as gas stream analysis. An internal option
board allows auto-zeroing, DC power operation,
timed regeneration, and timed sampling during
prolonged unattended sampling periods. The option
board also allows external fresh air solenoid
support and 4-20 mA or 0-2 V analog output.
A molded hard carrying case or soft field case
give added versatility and organized storage
for the instrument and its accessories.
FEATURES
.
Accurate
analysis of mercury vapor in seconds
.
Rugged
and easy to operate
.
Rechargeable
internal battery pack for portability
.
Automatic
backlight for LCD during low light conditions
.
Microprocessor
ensures a linear response throughout the entire
range of the sensor
.
Survey
mode for rapid source detection of mercury vapor
concentrations
.
Wide
detection range allows multiple applications
.
Pressure
sensitive membrane switch operation
.
Inherently
stable gold film sensor
OPTIONAL ACCESSORIES
.
Data
Logger to record field monitoring information
.
Dosimeters
provide time-weighted averages for personal
mercury exposure or gas stream analysis and
are reusable
.
JCI
Software Kit for downloading information from
the data logger to a PC or unattended, fixed-point
sampling
.
Option
Board for external fresh air solenoid support,
auto-zeroing, DC power operation, timed regeneration,
4-20 mA or 0-.
2
V analog output, and timed sampling
.
Hard
or soft Field Carrying Cases for versatile handling
and additional storage
.
Functional
Test Kit for sensor calibration verification
in the field
.
Maintenance
Kit for routine maintenance and upkeep
APPLICATIONS
.
Mercury
Surveys and Soil Screening
.
Spill
Response
.
Ensure
Worker Safety
.
Research
Projects for Stack, Flue and Natural Gas
.
Hazardous
Waste Sites
.
Mercury
Exclusion Tests
.
Monitor
Disposal and Recycling of Fluorescent Lamps
.
Exhaust
Duct Analysis
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Lumex
Portable Mercury Analyzer Model RA-915+ |
Design features
The RA-915+ mercury analyzer employs differential
atomic absorption spectrometry technique, which
is implemented using the direct Zeeman effect
(Zeeman Atomic Absorption Spectrometry using
High Frequency Modulation of Light Polarization
ZAAS-HFM). A glow discharge mercury lamp is
placed in a permanent magnetic field, whereby
the 254-nm mercury resonance line is split into
three polarized components, only two of those,
s+ and s-, which are circularly polarized in
the opposite directions, being detected for
analysis. After passing through a polarization
modulator, which modulates the polarization
at a frequency of 50 kHz and thus triggers the
line components in turn, the radiation then
passes through a multi-path cell, whose equivalent
optical length is about 10 m. Being equipped
with narrow-band high reflectivity mirrors,
the cell isolates solely the 254-nm resonance
line and suppresses all the nonresonance and
stray radiation. A logarithm of the intensity
ratio of s+ and s-, which is proportional to
the mercury atom concentration in the cell,
is determined upon detecting the radiation by
a photodetector and subsequent analog-digital
conversion of its electric signal by a built-in
microprocessor. The measurement results are
read out from a built-in LC display, or are
transmitted to a computer for further processing
or data storage. In this measurement technique,
the analytical signal depends only on mercury
concentration and is independent of the presence
of dust, aerosols , and other foreign contaminants
in the analytical cell.
Water analysis
An RP-91 attachment is used for the mercury
determination in water by the «cold vapor»
technique. A reducing agent, SnCl2, is added
to a sample, and the atomic mercury thereby
released is conveyed to the analytical cell
by a carrier gas. The ultimate mercury detection
limit in water solutions is 0.6 ppt (ng/l),
the sample volume being 10 ml and the analysis
time being no more than 90 sec.
Analysis of complex matrix samples
An analysis is carried out using an RP-91C attachment,
wherein mercury is converted from a bound state
to the atomic state by thermal decomposition
in a two-section atomizer. The sample is vaporized
in the first section, and the mercury compounds
are partly decomposed. In the second section,
which is heated to 800° C, the mercury compounds
become fully decomposed, organic compounds and
carbon particles are catalytically after burnt,
to carbon dioxide and water. This technique
is used to determine mercury in soils, food
products, biological samples, and crude hydrocarbon
products, no preliminary sample mineralization
being needed and the analysis itself taking
1-2 minutes.
Specifications
Size and weight (with a storage
battery and recharger) 460x210x110mm, 7.58 kg
Power requirements 110/220V,
50/60Hz 15W AC or 10-14V DC
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