Calibration Mode; Conductivity Calibration - EUTECH INSTRUMENTS ALPHA CON 1000 CONDUCTIVITY CONTROLLERTRANSMITTER (REVISION 3) Instruction Manual

Operating Instructions
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.
Note: When calibrating with manual temperature compensation, the controller automatically changes
from the preset process temperature to the calibration temperature. After leaving the Calibration
mode, the controller switches back to process temperature (for setting the calibration temperature and
the process temperature, see section 7.2.1).
11
αlpha-CON1000
HOLD SETUP
Cal
C
6
HOLD CAL
100.0
%
CEL
6
HOLD CAL
1413
µ
S
°C
25.0
6
ATC
HOLD CAL
1.01
fc
6