Thermo Fisher Scientific CyberScan CON 510 - Manual (Page 32)

Instruction Manual CON 510
15 ADDENDUM 3: CALCULATING TEMPERATURE COEFFICIENTS
To determine the temperature coefficient of your sample solution use this formula:
Where:
tc = Temperature coefficient 25 = 25 °C
C
T1
= Conductivity at Temp 1 C
T2
= Conductivity at Temp 2
T
1
= Temp 1 T
2
= Temp 2
NOTE: A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe into a sample solution and adjust the temperature coefficient to 0% (that is, no compensation) by
performing the following:
A. From measurement mode, press the SETUP key to enter into [SETUP] mode.
B. Use
MI/▲ or MR/▼ key until the lower display shows “P5.0”.
C. Press ENTER key twice. The lower display reads tCO and the upper display shows the temperature coefficient
value.
D. Press the MR/▼ key until the upper display shows 0.0.
E. Press ENTER key to confirm the value.
F. Press CA/MEAS key to return to measurement mode.
2. Wait for 5 minutes. 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 different from T
1
, and note
the conductivity reading C
T2
.
NOTE: Record your results for future reference. Ideally T
1
and T
2
should bracket your measurement temperature, and
should not different by more than 5 °C.
4. Calculate the temperature coefficient of your solution according to the formula shown above.
5. Enter the temperature coefficient you calculated into the meter by repeat step A to C. Use MI/▲ or MR/▼ key to set
the desired value. Press ENTER key to confirm selection and then press CAL/MEAS key to return to measurement
mode.
The calculated temperature coefficient will not be applied to all the meter readings.
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