KROHNE SMARTPAT PH 8530, Handbook

Page: 27 / 52

OPERATION
5
27
SMARTPAT PH 8530
www.krohne.com 03/2016 - 4002544803 - MA SMARTPAT PH 8530 R03 en
• Select no no no no to deactivate the function manual hold manual hold manual hold manual hold.
• Press Enter Enter Enter Enter to leave the calibration menu.
A pH calibration is necessary in regular intervals or when installing a new pH sensor.
If the calibration was not successful, the message Warning!
Warning! Warning!
Warning! appears behind the values Offset
Offset Offset
Offset
and/or Slope
Slope Slope
Slope.
• Press Ok Ok Ok Ok to proceed.
• Set the calibration date with MM-DD-YYYY. Press the key > to enter the submenu. Now you can
change the calibration date.
• Press Enter Enter Enter Enter and Ok Ok Ok Ok to proceed.
i The messages Warning! Offset out of range! Warning! Offset out of range! Warning! Offset out of range! Warning! Offset out of range! and/or Warning! Slope out of range! Warning! Slope out of range! Warning! Slope out of range! Warning! Slope out of range! and Save Save Save Save
values? values? values? values? appear.
• Select between yes
yes yes
yes or no
no no
no.
• Press Enter
Enter Enter
Enter to proceed.
• Select No
No No
No to deactivate the function manual hold
manual hold manual hold
manual hold.
• Press Enter
Enter Enter
Enter to leave the calibration menu.
If the message ATTENTION! Slope out of range! ATTENTION! Slope out of range! ATTENTION! Slope out of range! ATTENTION! Slope out of range! appears, no data can be saved.
• Press Ok Ok Ok Ok to proceed.
• The message No saving possible No saving possible No saving possible No saving possible appears.
• Press Ok Ok Ok Ok to proceed.
• Select no no no no to deactivate the function manual hold manual hold manual hold manual hold.
• Press Next Next Next Next to leave the calibration menu.
In a fully functional sensor, the optimal slope is -59 mV for each pH unit and the optimal zero
point is 0 mV at pH 7. The slope should at least have a value between -50...-65 mV per pH unit.
Re-calibrate the sensor if the slope does not approximate those limits. The pH sensor ages, the
slope gets flatter and the zero error increases.
CAUTION!
• Never touch or scratch the pH sensitive glass tip of the sensor.
• Make sure that the sensor tip is clean and dust-free. If necessary, clean the tip as described
on page 30
.
CAUTION!
Moisture on the sensor connector must be avoided! Moisture may cause a short-circuit and a
malfuntion of the sensor!
If moisture has entered the connector dry it with air (e.g. hot air gun).