General Description - Hanna Instruments PCA 311 Instruction Manual

GENERAL DESCRIPTION

The Hanna PCA 311, PCA 321 and PCA 331 series of
bromine, pH, ORP and temperature analyzers are micro-
processor controlled, process analyzers which continuously
monitor a sample stream for bromine content, pH, ORP
and temperature values.
The PCA 311-331 monitor the bromine in the 0.0 to 10.0 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 bromine. The color intensity is measured photometrically
(with a light beam and a photodetector) and converted to
bromine 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
window allowing the operator to check the reagent levels.
PCA 321 and PCA 331 analyzers use a HI 1005 probe to
continuously 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 331 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 311-331 analyzers meet NEMA 4X, 12 and
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