User Guide

5
GENERAL DESCRIPTION
The Hanna PL 100 and PL 101 Chlorine Analyzers are
amperometric titrators which allow the determination of the
chlorine content in a known quantity of sample . The PL 100
measures Free Chlorine and the PL 101 Total Chlorine.
The Hanna PL 100 and PL 101 Amperometric Titrators are
laboratory instruments containing a precision adjustable volt-
age source, a microammeter with LCD display, and a speed
regulated magnetic stirrer.
They operate providing a constant voltage to a dual elec-
trode platinum probe and indicating the resulting probe
current. As titration proceeds, the change of the electrode
current is noted. At the point known as the End Point, abrupt
change in the slope of the current curve occurs and the titra-
tion is complete. Sample concentration may be derived from
the End Point value.
The magnetic stirrer rotates at 300 RPM during the titration to
ensure proper mixing of the sample and titrant, yet slowly
enough to avoid volatilization of the measured species. The
stirrer motor is turned on and off with a rocker switch on the
front panel.
The instrument case features a stainless steel top and easy
visible LCD display for viewing the measured probe current.
Adjustment of applied probe voltage is provided by a digital
potentiometer. The potentiometer setting is controlled by two
keys in the front panel: ” ” and “ ”. A static digital memory
retains the last value set when the instrument power is re-
moved.
The PL 100 and PL 101 also feature a recorder output which
provides a low impedance output voltage from 0.00 to 2.00V:
This voltage corresponds to the probe current displayed on
the front panel LCD display. Probe current range is 0.00 to
2.00 µA.
A 10 mL glass automatic burette system is available together
with standard titration solutions 0.00564N Phenylarsine Ox-
ide (PAO) and 0.000564N PAO, to cover the 0-1.5 ppm of
Cl
2
or 1-15ppm of Cl
2
.
In addition to these a 0.00188N Iodine standard titration
solution is available in the range 0-4ppm of Total Chlorine.