User Guide

OPERATIONAL GUIDE

INITIAL PREPARATION

• Connect the power supply adapter to the DC input

• Connect the probe to the BNC connector.

• Be sure the front stirring switch is

in the OFF position and turn the

instrument on by the ON/OFF

switch on the rear panel.

PROCEDURES

Method A: free chlorine forward titration (PL100 only)

1. Fill the bottle of the automatic burette with

0.000564N PAO solution (HI 70471) for

titrations up to 1500 µg/L Cl

or use the

0.00564N PAO solution (HI 70470) for

titrations up to 15000 µg/L Cl

. Fill the

10 mL automatic burette to the zero mark.

2. Use a 100 mL volumetric pipet to trans-

fer 100 mL of sample to a 250 mL beaker

and add about 100 mL chlorine free wa-

ter.

3. Place the stirbar into the beaker.

4. Add 1 mL of pH 7 phosphate buffer solu-

tion (HI 70472) to the beaker.

Note: If the pH of the sample is between 6.0 and 7.5

it is not necessary to add the buffer.

5. Turn on the speed controlled stirrer and

place the beaker on the top of the PL 100.

6. Immerse the probe tip into the sample, make

sure the platinum electrodes are submerged.

7. Adjust the potentiometric setting, using the “ ”

and “ ” keys on the front panel until the dis-

play reads about 1.00.