Thermo Fisher Scientific Alpha COND 1000 - Manual (Page 19)

Operating Instructions Thermo Scientific Alpha COND 1000
11
6 CALIBRATION MODE
You can reach the Calibration mode directly from the Measurement mode by
pressing the CAL key and entering the Calibration security code. You can also
reach the Calibration mode from the Advanced Setup mode.
6.1 Conductivity Calibration
Calibration is always carried out in the specific range selected. The Conductivity
Controller allows a one-point calibration.
1) Enter Calibration mode. While in the Measurement
mode, push the CAL key and scroll to Calibration
code “11”. Push the ENTER key again. The upper
display reads “CAL” and the lower display shows
“Con”.
2) Press the ENTER key. The controller displays its
last set Cell Constant (k) of the cell as a percentage
of the theoretical value. Using the
▲and ▼ keys, the
value can be set to anywhere from 80 to 120% (e.g.
real cell constant is 0.98 with nominal =1, enter
98%). . Press the ENTER key once again to carry
out calibration.
3) Immerse the Conductivity cell in a suitable standard
solution, whose value is within the measurement
range selected in the controller. Agitate the Cell in
the solution to remove any trapped air-bubbles.
Note: The calibration standard should have a value that
is between 20% to 100% of the range selected. For
example, if the range in the controller is selected to be
2000 µS (range 6), then the calibration standard value
should be 400 µS to 2000 µS.
4) Once the reading has stabilized, use the ▲ or ▼
keys to adjust the measured value to that of the
standard solution. Press the ENTER key to accept the value and the controller
displays the revised condition of the probe. The lower display shows the factor
“FCt” while the upper display shows the ratio of ideal to adjusted calibration
value.
Note: The acceptable calibration window is ±40% of the displayed (default) value. If
the display is 1000 µS, the values to which it can be adjusted is 600 to 1400 µS. If
there is calibration error, the controller displays “ERR” annunciator. To re-calibrate
repeat step 3. To exit from calibration, push both
▲ and ▼keys (escape) to resume
to Measurement mode.
5) Press the ENTER key. If you entered the calibration mode using the CAL key,
the controller will return to the Measurement mode. If you entered the calibration
mode from the Advanced Set-up mode, the controller will return to the sub-
function menu.
HOLD
HOLD
HOLD
HOLD
SETUP
CAL
CAL
CAL
%
6
6
6
6
Cal
100.0
1.01
1413
CEL
fc
25.0
μ S
ATC
° C
C