Hanna Instruments hi 9810 用户手册

EC/TDS

EC/TDS CALIBRATION

CALIBRATION

Accessories needed:

• Use

HI 7039 or HI 8039, 5,000 µS/cm EC solution or HI

7032, 1382 ppm TDS solution.

Note: the conversion between EC and TDS is made by a built-in

circuit, hence it is requested to calibrate the meter only in EC
or TDS range. The other range is thus automatically cali-
brated.

PROCEDURE

• Pour approximately 4 cm (1½") of a con-

ductivity calibration solution (e.g. HI
7039/HI 8039) into a beaker. If pos-
sible, use plastic beakers to minimize any
EMC interference.

• Immerse the combined electrode in the solution.
• Wait for a couple of minutes for thermal equilib-

rium to be reached.

• Tap the combined electrode on the bottom, then

shake it lightly while rotating to make sure no air
bubbles remain trapped inside the probe.

• Select the appropriate range, e.g. µS/cm.

• Turn the EC/TDS calibration knob until the

display shows the EC or TDS reading at
25 C.

For greatest accuracy, frequent calibration of the instrument is recom-
mended. The instrument should be recalibrated for pH:

a) Whenever the electrode is replaced.
b) At least once a month.
c) After testing aggressive chemicals.
d) Where extreme accuracy is required.

PREPARATION

Pour small quantities of pH 7.01 (HI  7007 or
HI  8007) or pH 4.01 (HI  7004 or HI  8004) or
pH 10.01 (HI 7010 or HI 8010) solution into
a clean beaker.
To obtain accurate readings, use pH 7.01 (HI  7007 or HI 8007) if
you are going to measure neutral or close to neutral samples, pH 4.01
( H I  7004 or HI  8004) if you are going to measure acidic samples
or pH 10.01 (HI  7010 or HI  8010) for alkaline measurements.
If you need to calibrate

HI 9810 to NBS standards, use pH 6.86

(HI 7006 or HI 8006) instead of pH 7.01 and pH 9.18 (HI 7009
or HI 8009) instead of pH 10.01.

PROCEDURE

• Switch the meter on after connecting the electrode and press

to display pH measurement.

• Remove the protective cap from the electrode, rinse

and immerse it in the buffer and stir gently. Wait a
couple of minutes for the reading to stabilize.

• If the buffer solution is not at ambient temperature,

take its temperature with a ChecktempC (or an accu-
rate thermometer), e.g. 10.0 C.

Note: the electrode should be submerged approximately 4 cm (1½") into the

solution. The ChecktempC should be located close to the electrode.

• Adjust the pH calibration knob until the LCD

shows the pH value at the above temperature
(see the pH versus temperature chart on
page 10).

• The pH calibration is now complete.

pppppH CALIBRATION

H CALIBRATION