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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 section Measurement Principle Non-dispersive double-beam cold vapor atomic absorption spectrometry
Measurement method Reducing Vaporization with open air-supply (Peak height measuring and integration measuring selectable)
Light source Low pressure mercury discharge lamp
Wave length 253.7nm
Detector Semiconductor sensor (w/254nm bandpass filter)
Detection Limit 0.0025ng/5mL (0.5ppt)
Maximum range 2,000ng/5mL (400ppb)
Carrier gas required No Compressed Purified Gas required
Measuring flow rate Adjustable (0.1~0.9 L/min)
(just operate with ambient air)
Measuring time 30sec~999sec
Dehumidifier Peltier device
Mercury removal Removal by activataed carbon
Data processing system
OS Windows 10 Pro
Communication USB
Display Peak 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
Print Measuring conditions, Calibration curve, Measured values, Statistical calculations, Peak wave shape and Measuring time
Quality control Check standard, Avoid abnormally high mercury etc
Installation requirements Installation dimensions 248W x 253D x 180H (mm)
Weight 4.7 (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