eutech-instruments waterproof cyberscan con 400410 & tds 400 conductivitytds meter 用户手册
Instruction Manual
CON 400/410
- 47 -
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.
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.
above.
5.
Enter the temperature coefficient you calculated into the meter.
A.
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.