• 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-5A
  • WA: Atmospheric mercury analyzer
  • EMP: Portable mercury survey meter

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Reducing-vaporization mercury analyzer


Simple, powerful and multi-configurable reducing vaporization CVAAS mercury analyzer by PC operated.



Ultra-High sensitivity and Excellent Precision

The RA-5A 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).


It requires only 5mL sample and is environmentally-friendly through the direct purge design that reduces reagent consumption and waste production drastically.

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.



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)
Maximum range2,000ng/5mL (400ppb)
Carrier gas requiredNo Compressed Purified Gas required
Measuring flow rateAdjustable (0.1~0.9 L/min)
(just operate with ambient air)
Measuring time30sec~999sec
DehumidifierPeltier device
Mercury removalRemoval by activataed carbon
Data processing system
OSWindows 10 Pro
DisplayPeak wave shape, Calibration curve, Measuring time and measuring result
Data processing software Selectable 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
Installation requirementsInstallation dimensions248W x 253D x 180H (mm)
Weight4.7 (kg)
Installation environment 10°C~35°C, < 10~80% RH
(Non condensing environment is allowed)
Power supply  AC, single phase, 100~240V 50/60 Hz, 150VA
(AC adaptor included)


The RA-5A 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 20mL, 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 AC100~240V, 50/60 Hz, 150VA (AC adaptor included)
Measurement 180W x 250D x 490H (mm)
Weight Approx. 7kg
RD-5 auto dispenser

RD-5: auto dispenser

Dispensing Tube pump (3 lines)
Dispensing volume Adjustable (Minimum 0~99.9mL)
Dispensed reagents · Sulfuric acid
· Tin (II) chloride solution
Control, Power supply Direct pump driving from RA-5A
Measurement 250W x 230D x 80H (mm) (with RA-5A connection)
Weight Approx. 2kg (Stand inclusive)

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