KROHNE SMARTSENS ORP 8150 EN - Manual (Page 21)

SERVICE
5
21
SMARTSENS ORP 8150
www.krohne.com 11/2013 - 4002546702 - MA SMARTSENS ORP 8150 R02 en
Service
5.1 Maintenance
5.1.1 Cleaning
• Clean the platinum sensor surface with demineralised water.
• Slight dirt residues or dust: Rinse the sensor tip with demineralised water and clean it with a
soft tissue.
• Oily and greasy coatings: Remove with a warm soap solution and rinse with demineralised
water.
• Hardness deposits or metal hydroxide deposits: Soak the sensor tip including diaphragm in
10% citric acid or hypochloric acid for a couple of minutes and rinse the complete glass shaft
of the sensor with demineralised water.
• Biological fouling: Soak the sensor tip including diaphragm in 10 % pepsin solution for
minimum 3 hours and afterwards rinse the complete glass shaft of sensor with demineralised
water.
5.1.2 Aging and re-calibration
During operation, but already during storage, ORP sensors age due to poisoning effects of the
inner buffer system. Therefore it is important to re-calibrate the sensor in regular intervals.
Consider status messages and diagnostic information.
Aging effects ORP sensor: Aging effects ORP sensor: Aging effects ORP sensor: Aging effects ORP sensor:
• Shift of zero point: Shift of zero point: Shift of zero point: Shift of zero point:Compare the zero point shift (use a ORP solution, e.g. 468 mV) with the
sensor-specific offset value of the last calibration. In this case dip the sensor tip into the ORP
solution and read the measured value. If the measured value deviates +/- 15 mV from the
value of the ORP solution, a calibration is required. For more information refer to
Calibration
on page 17.
5.2 Availability of services
The manufacturer offers a range of services to support the customer after expiration of the
warranty. These include repair, maintenance, technical support and training.
INFORMATION!
Recalibrate the sensor after each cleaning procedure
INFORMATION!
The lifetime expectation depends heavily on the application. The right choice of the sensor type is
very important.
INFORMATION!
For more precise information, please contact your local sales office.
.book Page 21 Monday, November 18, 2013 10:29 AM