• MA: Direct thermal decomposition mercury analyzer
  • PE: Fully automated petro-pyrolysis mercury analyzer
  • RA: Reducing-vaporization mercury analyzer
  • RA-4500
  • RA-4300
  • RA-4300FG+
  • RA-5
  • WA: Atmospheric mercury analyzer
  • EMP: Portable mercury survey meter
  • Continuous mercury monitor

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Reducing-vaporization mercury analyzer


Simple and small, but powerful & multi-configurable with new full color touch panel



Excellent operability with a full color, multi-touch display

The RA-5 is innovational reducing-vaporization mercury analyzer that is equipped with the world’s highest level of performance in the body that is the smallest in its class. Compared to our previous model RA-3A, the installation space is reduced to half or less (about A4 size).

We are sure you will be satisfied with its excellent operability and ease of maintenance since intuitive operation is realized by using a full-color LCD touch panel.

The high sensitivity and high accuracy are only available by the equipment dedicated to mercury measurement and further enhanced by the newly designed detector. The sensitivity of the equipment is sufficient to determine even a small amount of mercury below the lower limit specified in the Waterworks Act.


Simple, yet powerful

Samples are wet-pretreated according to measurement methods described in standards such as JIS K0102 to transform all mercury into divalent mercury ion (Hg2+).

When Tin (II) Chloride solution is added to the wet-pretreated sample, divalent mercury ion (Hg2+) is reduced to zero-valent metal mercury, and, by using mercury bubblers, the metal mercury turns into mercury gas.

The acid mist and water vapor that are generated during mercury bubbling are removed by the use of the electronic cooling unit and other devices, the mercury gas is introduced into the absorption cell, and the mercury is measured by atomic absorption spectroscopy.

We are sure that its intuitive operation will satisfy users who are beginners of mercury measurement, and that its rich specifications will satisfy advanced users as well.

Equipped new functions

  • Due to an installed touch panel type PC, there is no need to connect the equipment to other PC. (Retrieval of measurement data and connection to a printer or mouse can be more simplified with a USB interface.)
  • Daily inspection to check the equipment stability is automated.
  • The minimum amount of samples required for measurement is 5mL. The conventional reducing-vaporization unit (20mL) can be used.
  • The peak for mercury and the peak for other substances are automatically identified.
  • A wide measurement range up to 400ppb is realized.
  • This equipment has a countermeasure function against high-concentration contamination to keep the measurement accuracy.


Mercury detecting sectionMeasurement PrincipleNon-dispersive double-beam cold vapor atomic absorption spectrometry
Measurement methodReducing Vaporization with open air-supply (Peak height measuring and integration measuring selectable)
Light sourceLow pressure mercury discharge lamp
Wave length253.7nm
DetectorSemiconductor sensor (w/254nm bandpass filter)
Detection Limit0.0025ng/5mL (0.5ppt)
*5ppt in case of including chemical treatment
Maximum range2,000ng/5mL (400ppb)
Carrier gas requiredNo Compressed Purified Gas required
Measuring flow rateAdjustable (0.1~1.0 L/min)
(just operate with ambient air)
Measuring time90sec~999sec
DehumidifierPeltier device
Mercury removalRemoval by activataed carbon
Data processing system
SoftwareRA5 data processing system
Display screen 8inch color liquid crystal display
DisplayPeak wave shape, Calibration curve, Measuring time and measuring result
ControlTouch panel key control
Data processing softwareSelectable from 6 formulas (3 linear and 3 3rd Order fits), Correlation coefficient is automatically calculated. Statistic calculation: Mean value, standard deviation, Coefficient of variation (All values are automatically calculated.), Self-check function
PrintMeasuring conditions, Calibration curve, Measured values, Statistical calculations, Peak wave shape and Measuring time
Quality controlCheck standard, Avoid abnormally high mercury etc
Data output USB enabled printer & LIMS
Installation requirementsInstallation dimensions248W x 253D x 175H (mm)
Weight6 (kg)
Installation environment5°C~35°C, < 85%RH
(Non condensing environment is allowed)
Power supply AC, single phase, 100~240V 50/60 Hz (AC adaptor included)


The RA-5 is suitable for a wide variety of aqueous samples, including digested solids.
It can be used for mercury analysis in drinking waters, industrial wastewaters, fresh water sources, seawater, soils, sludges, tissues & more.

Test methods

USEPA 245.1, 245.2, 245.5, 7470A, 7471B,
ASTM D 3223-02, EN-1483, APHA 3112,
JIS K0102 and more


SC-5 auto sample changer

SC-5: auto sample changer

Sample vessel: Number

[Standard]: Sample vessel for 5mL: 30 (with vessel sensor function)

[Option]: Sample vessel for 20mL: 12 (with vessel sensor function)

Sample vessel for 100mL and 250mL: 5 (with vessel sensor function)

Sample access Random access
Bubbler tube PEEK tube (for sample 5mL)/Glass Frit (for sample 20, 100 and 250mL)
Power supply DC24V (AC adaptor included)
Measurement 180W x 250D x 490H
Weight Approx. 7kg
RD-5 auto dispenser

RD-5: auto dispenser

Dispensing Tube pump (3 lines)
Dispensing volume Adjustable (Minimum 0.1mL~)
Dispensed reagents · Sulfuric acid
· Tin (II) chloride solution
· Hydroxylamine hydrochloride solution
Control, Power supply Direct pump driving from RA-5
Measurement 250W x 230D x 80H (with RA-5 connection)
Weight Approx. 2kg (Stand inclusive)

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