User Guide

23
MAINTENANCE
CALIBRATION REQUIREMENT
Calibration of the PL 100 and PL 101 Chlorine Titrators is
not required.
If, for any reason, the measurements are inaccurate, contact
your dealer or the nearest Hanna Customer Service Center
for recalibration.
PROBE CONDITIONING
When the probe has not been used for some time (one week)
or it is new, it is recommended that it be conditioned as fol-
lows:
1. Add a few drops of bleach to tap water in a 250 mL
beaker and place the stir bar in the beaker.
2. Place the beaker on the PL 100/PL 101, turn on the
instrument and the stir motor.
3. Immerse the probe in the solution, adjust the digital po-
tentiometer for a current of 0.5 to 1.5 µA, and leave for
ten minutes.
PROBE CLEANING PROCEDURE
Cleaning involves soaking the probe in a 1:1 nitric acid solu-
tion for two hours and than rinsing with deionized water. To
stabilize the cleaned probe soak it in chlorinated tap water.