User Guide

• Adjust the calibration trimmer (see page 7,#6) on the side of the

instrument with the calibration screwdriver until the display shows

the TDS reading at 25°C (see the TDS vs. temperature chart on

page 19). E.g. @25°C "1382 mg/L".

• All subsequent measurements will be compensated to 25°C (77°F).

If you prefer to standardize the temperature compensation to

20°C (68°F) rather than 25°C (77°F), leave the TEMPERATURE

knob to 18°C (if the temperature of the solution is 18°C). Adjust

the trimmer to read "1251 mg/L" (see the TDS vs. temperature

chart on page 19). All subsequent measurements will be compen-

sated to 20°C.

• The calibration is now complete and the instrument is ready for

use.

The instrument should be re-calibrated once a month, or when the

probe or battery is changed.

Note: For more accurate results, it is advisable to use a calibration

solution close to the range to be measured. See the accessories

section on page 23 for a wide selection of TDS solutions.

PROCEDURE FOR HI 933000

• Pour sufficient quantity of a conductivity

calibration solution (e.g. HI 7030/

HI 8030) into a beaker to cover the holes

on the probe. If possible, use plastic bea-

kers to minimize any EMC interference.

• Immerse the conductivity probe in the

solution, making sure that holes are com-

pletely submerged.

• Wait for a couple of minutes for thermal

equilibrium to be reached.

• Tap the probe on the bottom, then shake it while rotating to make

sure no air bubbles remain trapped in the sleeve.

HI 7030