15
Highly acidic, alkaline samples or solutions with high salt content might
have a different coefficient than the customary 2% per degree °C.
In order to calculate this coefficient follow the procedure below:
• Immerse the probe of
HI8733
in the sample and adjust the
TEMPERATURE COEFFICIENT knob to 0% (i.e. no compensation).
• Condition the sample and probe to 25 °C and note the conductivity
reading, C
25
.
• Condition the sample and probe to a different temperature t °C
(approximately 10 °C different from 25 °C) and note the conduc‑
tivity reading C
t
.
• The temperature coefficient
β
of the solution is calculated as given
by the following formula:
(C
t
‑ C
25
)
β
= 100 x
(t ‑ 25) x C
25
The above procedure is suitable for determining the temperature
coefficient in a laboratory or where the temperature of the solution
can be controlled.
If this is not possible (e.g. on‑site measurements), the following
procedure can be used providing the sample temperature varies by at
least 5 °C or preferably 10 °C:
• Immerse the probe of
HI8733
in the test solution and turn the
TEMPERATURE COEFFICIENT knob to 0% (no compensation).
• Check the conductivity reading and record the value. Make
sure the reading is stable, i.e. no greater variations than
±0.2 mS/cm within a minute.
• Repeat the procedure when the temperature of the test solution
has changed by at least 5 °C. Wait for the conductivity reading to
stabilize.
• Adjust the TEMPERATURE COEFFICIENT knob until the display shows
the same value as recorded earlier.
• The value indicated by the knob is the temperature coefficient of
the solution.
DETERMINING THE TEMPERATURE
COEFFICIENT OF A SOLUTION (HI8733)