Burkert Type 8619 - Manual (Page 94)

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Adjustmentandcommissioning
CALIB. LOG: Read the latest valid calibration values.
manually calibrating the ph or redox sensor
• The pH sensor can be calibrated according to a 1-point or a 2-point procedure.
• The redox sensor can only be calibrated according to a 1-point procedure.
• Modify the default calibration limits before calibrating your sensor: see chap. 8.10.23
• In order not to interrupt the process, activate the HOLD function (see chap. 8.11.1).
• Before each calibration, correctly clean the electrode with a suitable product.
• In a 2-point calibration, the buffer solutions used must be at the same temperature.
• Set the periodicity of calibrations in the "Calibration Interval" function (see previous page): each time a
calibration is due, the multiCELL generates a "maintenance" event and a "warning" event.
Detailed procedure for the 1- or 2-point calibration of a ph sensor
• The 1-point calibration procedure is used for rapid calibration by adjusting the zero of the measurement graph
with a buffer solution with a known pH (to calibrate a pH sensor: see below) or a known oxidation reduction
potential (to calibrate a redox sensor: see page 94).
• The 2-point calibration procedure is used for accurate calibration of zero and the slope of the measurement
graph of the pH sensor. This operation requires 2 buffer solutions: in general a first solution with a pH of 7 and
a second solution with a pH very close to that of the process value to be measured. See below.
Type 8619
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