KROHNE SMARTSENS PH 8320 EN - Manual (Page 19)

OPERATION
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SMARTSENS PH 8320
www.krohne.com 11/2013 - 4002543902 - MA SMARTSENS PH 8320 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.
4.1.2 Calibration with HART ® Handheld 475 FIELD COMMUNICATOR
Manual hold
• Start the function calibration calibration calibration calibration in menu mode Quick Setup Quick Setup Quick Setup Quick Setup or Setup Setup Setup Setup.
• Activate the function manual hold manual hold manual hold manual hold to avoid an alarm.
• Select Yes Yes Yes Yes.
• Press Enter Enter Enter Enter to proceed.
Temperature compensation
• Set the temperature compensation temperature compensation temperature compensation temperature compensation for calibration.
• Select between automatic automatic automatic automatic or manual manual manual manual.
i If you have selected manual temperature compensation manual temperature compensation manual temperature compensation manual temperature compensation, please enter the temperature of
the pH buffer solution. Default setting: 25°C / 77°F.
• Press Enter Enter Enter Enter to proceed.
Start calibration procedure
• Dip the sensor into the first pH buffer solution 1 and wait till the value is stable.
• Press Ok
Ok Ok Ok to proceed.
i The measurement of pH buffer solution 1 pH buffer solution 1 pH buffer solution 1 pH buffer solution 1 starts and the values pH and temperature appear.
After approx. 10 seconds the following values appear:
pH value
temperature value
Status buffer detection → Finished
Value indentified buffer
• Press Ok Ok Ok Ok to confirm the identified pH buffer solution. If neccessary change the value of the pH
buffer solution manually.
• Press Enter Enter Enter Enter to proceed.
i If the sensor does not recognise the pH buffer solution the messages
Identified buffer
Identified buffer Identified buffer Identified buffer → 0 pH 0 pH 0 pH 0 pH and Buffer not recognised Buffer not recognised Buffer not recognised Buffer not recognised appear.
• Press Ok Ok Ok Ok to proceed.
i Enter the value of the pH buffer solution manually.
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 Monday, November 18, 2013 10:42 AM