Hanna Instruments PCA 310 - Manual (Page 7)

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GENERAL DESCRIPTION
The Hanna PCA 310, PCA 320 and PCA 330 series of chlo-
rine, pH, ORP and temperature analyzers are microprocessor
controlled, process analyzers which continuously monitor a
sample stream for chlorine content, pH, ORP and temperature
values.
The PCA 310-330 monitor the free chlorine or total chlorine
in the 0 to 5 mg/L range depending on the factory settings
and used reagents.
In the DPD Colorimetric method, N, N-Diethyl-p-phenylene-
diamine indicator and a buffer are mixed with the sample.
The resulting chemical reaction causes a magenta color to
form. The color intensity is proportional to the concentration
of chlorine. The color intensity is measured photometrically
(with a light beam and a photodetector) and converted to
chlorine concentration, in mg/L, which is displayed on the
front panel.
Indicator and buffer reagent bottles are placed directly into
the instrument case. With a sampling period of 5 minutes,
reagents need to be replenished about once a month. The
reagent bottles are easily visible through the transparent win-
dow allowing the operator to check the reagent levels.
PCA 320 and PCA 330 analyzers HI 1005 probe to continu-
ously measure the pH of the sample stream in the range of 0
to 14 pH. The sample temperature is measured in the 5 to
75
°C range. pH and temperature are displayed on the front
panel. pH value is corrected with temperature.
PCA 330 analyzer use HI 2008 platinum ORP electrode to
continuously measure the sample ORP value.
The pH/temperature combined sensor and the ORP sensor
are placed inside the case, directly in the sample stream.
The case of PCA 310-330 analyzers meet NEMA 4X, 12 and