58
Adjustmentandstart-up
calibrate the ph sensor ("calibration" function in the "probe" menu)
• The pH sensor can be calibrated according to a 1-point or a 2-point procedure.
• In order not to interrupt the process, activate the HOLD function. Refer to chpt. 9.12.1.
• 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 "Interval" function in the sub-menu CALIB INTERVAL (see
above): each time a calibration is due, the device generates a "maintenance" event and a "warning"
event.
1-point calibration
The 1-point calibration procedure is used for quick calibration by adjusting the offset of the measurement graph
with a buffer respectively a calibration solution with a known pH (to calibrate a pH sensor: see page 59)
2-point calibration
The 2-point calibration procedure is used for the precise calibration of the offset and the gradient ("span") of the
sensor measurement graph.
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 page 59).
English
Type 8202 ELEMENT