Справочник Пользователя для Hanna Instruments hi 7034

14

2

1.5

1

0.5

0

TEMPERATURE COEFFICIENT

Follow the procedure described below:
1) Immerse the probe into a sample of the solu-

tion and adjust  the knob to 0% (i.e. no
compensation).

2) Condition the sample and probe at 25°C

and note the conductivity reading C25.

3) Condition the sample and probe to a tem-

perature  t°C which is approximately 5°C to
10°C different from 25°C and note the conductivity reading Ct.

4) The temperature coefficient  ß of  the solution  is calculated with

the formula:

                (Ct - C25)

ß = 100 x ---------------------------

                             (t - 25) x C25
The above procedure is suitable for determining the temperature

coefficient in the laboratory where the temperature of the solution
can be determined and controlled. If this is not possible e.g.
during on-site  measurements, the following procedure should be
used:

a) Immerse the probe into the test solution and turn the temperature

coefficient knob to 0% (no compensation).

b) Allow the conductivity reading to stabilize (the reading should not

change by more than ±0.2 mS within 1 minute) and record the
value, C.

c) Repeat the procedure with the temperature of the solution changed

by more than 10°C. Wait for the conductivity reading to stabilize.

d) Adjust the temperature coefficient knob until the display reads the

value C as recorded earlier (point b).

e) The value indicated by the knob is the temperature coefficient of

the solution.