Hach Lange CL17, Руководство пользователя

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General information
2.2 General product information
2.2.1 Instrument description
DANGER
Chemical or biological hazards. If this instrument is used to monitor a treatment
process and/or chemical feed system for which there are regulatory limits and
monitoring requirements related to public health, public safety, food or beverage
manufacture or processing, it is the responsibility of the user of this instrument to
know and abide by any applicable regulation and to have sufficient and appropriate
mechanisms in place for compliance with applicable regulations in the event of
malfunction of the instrument.
The Hach CL17 Chlorine Analyzer ( Figure 1 ) 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
Fire hazard. This analyzer is intended to be used for aqueous samples only.
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.