Hanna-instruments PCA 310 Bedienungsanleitung PDF herunterladen (Seite 17)

METHOD OF ANALYSIS

Free available

chlorine oxidizes

the DPD indicator

reagent at a pH

between 5.5 and

6.0 to form a ma-

genta-colored

compound. The

intensity of the re-

sulting color is

proportional to

the concentration

of chlorine in the

sample. The pur-

pose of the buffer

solution is to

maintain the

proper pH.

To measure total

residual chlorine

(free available

chlorine plus com-

bined chlorine) the PCA adds potassium iodide. The chloram-

ines in the sample cause iodide ions to become iodine which

then act with free chlorine to oxidize the DPD indicator. After

the chemical reaction is complete, the optical signal at 555

nm is compared to the signal measured through the sample

(before the reagents were added). From these measurements

chlorine concentration is calculated.

pH AND TEMPERATURE MEASUREMENT

The HI 1005 pH/temperature probe provides at the out port

a potential proportional with the pH. The temperature is mea-

sured with PT100 platinum sensor.

For increased accuracy the pH is corrected with temperature

and with the calibration coefficients. Up to 2 buffers can be

used for calibration.

The temperature can be displayed in °C or °F.

The probe can withstand pressure up to 6 bar (87 psi).

ORP MEASUREMENT

The HI 2008 probe provides at the out port a potential propor-

tional with the ORP value. The value is directly displayed in mV.

The probe can withstand pressure up to 6 bar (87 psi).

FIL

REGULAT

VVE

TER

TRAP

(OPTIONAL)

PRESSURE

O DRAIN

SAMPLE

INLET

REAGENT

BOTTLES

DETECT

STIR

BAR

MAGNET

MOT

& REDUCER

PUMP

ROLLERS

SOLENOID

SAMPLE

LED

SAMPLE OUTLET

PCA 301

REAGENTS

HI 70460

TOTALCHLORINE INDICATOR SOLUTION

R:--

S:- -

ETICPCA30A

Contents:

p-ToluenesulfonicAcid (6192-52-5)

Water(7732-18-5)

FORLABORATORY AND INDUSTRIAL USEONLY

DONOT FREEZE

STOREAT ROOM TEMPERATURE

KEEPCONTAINER TIGHTLY CLOSED

PCA 301

REAGENTS

HI 70461

TOTALCHLORINE BUFFERSOLUTION

Xn:Harmful

R:22

S:46

ETICPCA30B

FORLABORATORY AND INDUSTRIALUSE ONLY

DONOT FREEZE

STOREAT ROOM TEMPERATURE

KEEPCONTAINER TIGHTLY CLOSED

HARMFULIF SWALLOWED.

IFSWALLOWED SEEK MEDICALADVICE IMMEDIATELY

ANDSHOW THIS CONTAINEROR LABEL.

Contents:

LithiumBimaleate (unknown)

LithiumMaleate (unknown)

Water(7732-18-5)

PROBE

HOLDER

ORP probe

PH probe

SAMPLE

OUTLET

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 75 76

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