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54400_desc.fm General Information
Appendix A General Information
Instrument Description
The Hach CL17 Chlorine Analyzer (Figure 22) is a microprocessor-controlled,
process analyzer designed to monitor a sample stream continuously for
chlorine content. Either free or total chlorine, in the range of 0 to 5 mg/L, can
be monitored. The buffer and indicator solutions used determine the choice
for free or total chlorine analysis.
CAUTION
This analyzer is intended to be
used for aqueous samples only.
PRUDENCE
Cet analyseur est prévu pour utilisation avec des échantillons d'eau
uniquement.
CUIDADO
Este analisador deve ser utilizado apenas em amostras de água.
VORSICHT
Dieser Analysator darf nur für Wasserproben benutzt werden.
CUIDADO
Este analizador está diseñado para muestras acuosas solamente.
The CL17 Chlorine Analyzer enclosure is environmentally rated for IP62 per
IEC 529. The enclosure is dust-tight, and drip-resistant but is not designed for
outdoor use.
The instrument uses a DPD Colorimetric Method which includes a N,N-
Diethyl-p-phenylenediamine (DPD) indicator and a buffer. The indicator and
buffer are introduced into the sample, causing a red color to form with an
intensity proportional to the chlorine concentration. Chlorine concentration,
measured photometrically, is displayed on the front panel, three-digit, LCD
readout in mg/L Cl
2
.
A recorder output (4-20 mA) is available. Recorder span minimum and
maximum values in mg/L Cl
2
are programmed by the operator at the analyzer
keyboard.
Programmable alarm circuits provide relay closures, both normally open and
normally closed, for two selectable chlorine level set points. Set points can be
programmed by the operator anywhere within the overall range. System
warning and system alarm features provide automatic, self-testing diagnostics
that detect a number of possible malfunctions, and provide alarm relay
closures indicating a need for operator attention.
The CL17 analyzer can be purchased with a Hach Network Interface Card
which allows the CL17 to display its readings on an AquaTrend
®
display or
allows data to be sent to a PC via a Serial Interface Module.
Indicator and buffer reagents (473 mL of each) are placed in the
instrument case in the original factory-filled bottles. Reagents are replenished
once a month.
The instrument is designed so electronic components are isolated from the
hydraulic components. Windows allow the operator to observe the display
indicators and reagent supply without opening the instrument enclosure.
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