KROHNE SMARTSENS PH 8150 EN - Manual (Page 21)

OPERATION
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SMARTSENS PH 8150
www.krohne.com 11/2013 - 4002543602 - MA SMARTSENS PH 8150 R02 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 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 11:05 AM