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.

. 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

. 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

. 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


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.


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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