Bürkert 8619 multiCELL WM AC, Operating Instructions Manual

Page: 136 / 194

8.11.6 Calibrating an analogue input, AI1 or AI2, at two points,
with respect to a measured value other than chlorine
This calibration does not replace the calibration of the measuring sensor connected to the analogue input.
Refer to section 8.9 to access the "Calibration" menu.
The 8619 associates the two calibrated values to the range of the selected
analogue input signal (slope and offset).
→
Immerse the probe of the sensor (for example a pH sensor) in the first buffer
solution: The 8619 displays the value measured for the solution.
→
Wait for the measurement to stabilise.
→
Enter the value of the buffer solution (indicated on the bottle).
Calibration Mx:Inputs 2-point PV calibration
OK
1st point
7.001 pH
7.000 pH
2nd point
10.001 pH
10.000 pH
→
Rinse the probe.
→
Immerse the clean probe in the second buffer solution: The 8619 displays the
measured pH of the solution.
→
Wait for the measurement to stabilise.
→
Enter the value for the second buffer solution (indicated on the bottle)
OK
AI1/AI2
Solution measured
value.
Calibration result
Offset: -3,498 pH
Slope: 0,876 pH/mA
SAVE
Mode:general
OK
→
The 8619 displays the measured value of the solution.
OK
Fig. 90 : Example for the calibration at 2 points of an analogue input with respect to the pH measured by an instrument
having a 4...20 mA output
136
Adjustmentandcommissioning
Type 8619
English