Hanna Instruments HI 95725C User Manual

Page 7

MEASUREMENT

SPECIFICATIONS

SPECIFICATIONS
Range

0.00 to 5.00 mg/L of Cl2 (Free or Total)

Resolution

0.01 mg/L from 0.00 to 3.50 mg/L; 0.10 mg/L above 3.50 mg/L

Precision

±0.03 @ 1.00 mg/L

Method

Adaption of the USEPA method 330.5 and Standard Method 4500-Cl G. The
reaction between chlorine and the reagents causes a pink tint in the sample.

REQUIRE REAGENTS

REQUIRE REAGENTS
Code

Description

Quantity/test

HI 93701A-T

DPD1 Indicator

3 drops

HI 93701B-T

DPD1 Buffer

3 drops

HI 93701C-T

DPD3 Solution

3 drops

REAGENT SETS

REAGENT SETS
HI 93701-F

300 tests Free Chlorine

HI 93701-T

300 tests Free and 100 test Total Chlorine

HI 93711-D3

DPD3 reagent for 200 tests Total Chlorine*

For other accessories see page 24.
*This reagent needs to be used in combination with HI 93701-T.

CHLORINE (FREE & TOTAL)

• Fill the cuvet with 10 mL of unreacted

sample, up to the mark, and replace the
cap.

• Place the cuvet into the holder and ensure

that the notch on the cap is positioned
securely into the groove.

• Press ZERO/SET and “SIP” will blink on

the display.

• After a few seconds the display will show

“-0.0-”. The meter is now zeroed and
ready for measurement.

• Select the parameter code for Chlorine

“Cl” by holding ZERO/SET (see page 12).

• Whenever the cuvet is placed into the measurement cell, it

must be dry outside, and completely free of fingerprints, oil or
dirt. Wipe it thoroughly with

HI 731318 (tissue for wiping

cuvets, see chapter “Accessories”) or a lint-free cloth prior to
insertion.

• Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost.

• It is possible to take multiple readings in a row, but it is recommended to take a new zero

reading for each sample and to use the same cuvet for zeroing and measurement.

• After the reading it is important to discard immediately the sample, otherwise the glass

might become permanently stained.

• All the reaction times reported in this manual are referred to 20°C (68°F). As a general rule

of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F).

• In order to maximize accuracy, prior to a measurement follow the validation procedure to be

sure that the instrument is properly calibrated. If necessary, calibrate the instrument.

• Turn the meter on by pressing ON/OFF.

• When the LCD displays “Cl”, “CYS” or “PH” it is ready. The

display code that appears is the one of the last selected
parameter.

• Keep ZERO/SET pressed to change parameter. The parameter

code will change every three seconds, until the key is released.
Select the program for Chlorine “Cl”, Cyanuric Acid “CYS” or
pH.

• After the desired parameter code appears on the display, perform either MEASUREMENT,

VALIDATION, or CALIBRATION PROCEDURE following the instructions reported in the related
chapter.

Code

Parameter

Page

Chlorine

CYS

Cyanuric Acid

OPERATIONAL GUIDE

Chlorine