User guide

OPERATION 4
21
SMARTSENS PH 8570
www.krohne.com11/2013 - 4002544902 - MA SMARTSENS PH 8570 R02 en
• Select no
nono
no to deactivate the function manual hold
manual holdmanual hold
manual hold.
• Press Enter
EnterEnter
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
OffsetOffset
Offset
and/or Slope
SlopeSlope
Slope.
• Press Ok
OkOk
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
EnterEnter
Enter and Ok
OkOk
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
yesyes
yes or no
nono
no.
• Press Enter
EnterEnter
Enter to proceed.
• Select No
NoNo
No to deactivate the function manual hold
manual holdmanual hold
manual hold.
• Press Enter
EnterEnter
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
OkOk
Ok to proceed.
• The message No saving possible
No saving possibleNo saving possible
No saving possible appears.
• Press Ok
OkOk
Ok to proceed.
• Select no
nono
no to deactivate the function manual hold
manual holdmanual hold
manual hold.
• Press Next
NextNext
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 24
.
CAUTION!
Moisture inside the sensor connector must be avoided! Moisture may cause a shortcut and
deliver erratic readings!
If moisture has entered the connector dry it with air (e.g. hair blower).
.book Page 21 Monday, November 18, 2013 4:44 PM