KROHNE SMARTSENS ORP 8510 EN - Manual (Page 19)

OPERATION
4
19
SMARTSENS ORP 8510
www.krohne.com 11/2013 - 4002547502 - MA SMARTSENS ORP 8510 R02 en
• 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.
4.2 Troubleshooting
CAUTION!
Make sure that the sensor tip is clean and dust-free. If necessary, clean the tip as described on
page 21.
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).
Problem Possible cause Remedy
The ORP sensor
does not deliver a
signal.
Mechanical damage of the
glass, e.g. small cracks.
Exchange sensor.
Open circuit Check the cable wiring of the sensor cable on the junction box.
Otherwise connect the sensor to the primary master e.g.
PACTware
TM FTD/DTM or to the HART ® handheld to exclude a sensor
damage.
The ORP sensor
delivers an
unstable signal.
The diaphragm in the
reference half cell does
not provide good contact
to the process medium
due to drying up or
coatings.
• Clean the diaphragm with hot soap or acid using a soft tissue
(details on page 21).
• Submerge sensor in water and increase the temperature to
+50...+60°C / +122...+140°F.
• Submerge sensor in 3 molar KCl solution at ambient temperature.
The decrease in temperature will cause the reference half cell to
suck in KCl solution through the diaphragm and regenerate the
diaphragms functionality.
.book Page 19 Monday, November 18, 2013 4:12 PM