KROHNE SMARTSENS PH 1590 EN - Manual (Page 19)

OPERATION
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SMARTSENS PH 1590
www.krohne.com 11/2013 - 4002545902 - MA SMARTSENS PH 1590 R02 en
• Press Next Next Next Next 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 19 Wednesday, October 30, 2013 11:35 AM