Thermo Fisher Scientific CyberScan CON 400 (For units manufactured from March 2010 onwards) - Manual (Page 53)

Instruction Manual CON 400
- 47 -
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 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 MI/S or MR/T key until the lower display reads P5.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value.
D. Press the MR/T key until the upper display shows 0.0.
E. Press ENTER key to confirm the value.
F. Press CA/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.
B. Press
the MR/T key until the lower display reads P5.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value (should be 0, as per step 1 above).
D. Press the MI/S key until the upper display shows your calculated temperature
coefficient.
E. Press ENTER key to confirm the value.
F. Press CAL/MEAS key twice to return to measurement mode.
The calculated temperature coefficient will not be applied to all the meter readings.