LaMotte CON 6 PLUS, Manual

Page: 32 / 36

32
Check the factor by multiplying the conductivity reading by the factor in
the above formula. The result should be in TDS value.
Tip: When the TDS factor is set to 1.0, Conductivity = TDS.
12. CALCULATING TEMPERATURE
COEFFICIENTS
To determine the temperature coe ffi cient of the sample solution:
t
c
=100 x
C
T2
– C
T1
C
T1
(T
2
– 25) – C
T2
(T
1
– 25)
Where:
t
c
= Temperature coe ffi cient 25 = 25 °C
C
T1
= Conductivity at Temp 1 T
1
= Temp 1
C
T2
= Conductivity at Temp 2 T
2
= Temp 2
NOTE: A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe in the solution. Stir gently. Adjust the
temperature coe ffi cient to 0% (no compensation) by following
the instructions in Section 6.5 – Temperature Coe ffi cient.
2. Wait 5 minutes. Stir gently. Note T
1
and C
T1
(conductivity at T
1
).
3. Condition the sample solution and probe to a temperature ( T
2
)
that is about 5 °C to 10 °C di ff erent from T
1
, and note the
conductivity reading CT
2
.
NOTE: Record the results for future reference. Ideally T
1
and T
2
should
bracket the measurement temperature, and should not di ff er by more than
5 °C.
4. Calculate the temperature coe ffi cient of the solution according to
the formula shown above.
5. Enter the calculated temperature coe ffi cient into the meter.
See Section 5.5 – Temperature Coe ffi cient .
The calculated temperature coe ffi cient will now be applied to all the
meter readings.