User guide

OPERATION 4
19
SMARTSENS PH 8570
www.krohne.com11/2013 - 4002544902 - MA SMARTSENS PH 8570 R02 en
• Press Next
NextNext
Next 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.
4.1.2 Calibration with HART
®
Handheld 475 FIELD COMMUNICATOR
Manual hold
• Start the function calibration
calibrationcalibration
calibration in menu mode Quick Setup
Quick SetupQuick Setup
Quick Setup or Setup
SetupSetup
Setup.
• Activate the function manual hold
manual holdmanual hold
manual hold to avoid an alarm.
• Select Yes
YesYes
Yes.
• Press Enter
EnterEnter
Enter to proceed.
Temperature compensation
• Set the temperature compensation
temperature compensationtemperature compensation
temperature compensation for calibration.
• Select between automatic
automaticautomatic
automatic or manual
manualmanual
manual.
i If you have selected manual temperature compensation
manual temperature compensationmanual temperature compensation
manual temperature compensation, please enter the temperature of
the pH buffer solution. Default setting: 25°C / 77°F.
• Press Enter
EnterEnter
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
OkOk
Ok to proceed.
i The measurement of pH buffer solution 1
pH buffer solution 1pH 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
OkOk
Ok to confirm the identified pH buffer solution. If neccessary change the value of the pH
buffer solution manually.
• Press Enter
EnterEnter
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 recognisedBuffer not recognised
Buffer not recognised appear.
• Press Ok
OkOk
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 4:44 PM