Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 64)

Instruction Manual PC 300
60
15 ADDENDUM 3: CALCULAT ING TEMPERAT URE
C O E F F I C IE N T S
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 of your 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 Setup mode.
B. Press the or keys until the lower display reads P8.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value.
D. Press the key until the upper display shows 0.0.
E. Press ENTER key to confirm the value.
F. Press CAL/MEAS key twice 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.
A. From measurement mode, press the SETUP key to enter Setup mode.