User guide

I-E67-84-1B February,2002 15-2
Table 15-1. Preventive Maintenance Schedule
Preventive Maintenance Tasks Interval
(months)
Check and clean all wiring and 12
wiring connections
Clean and inspect sensor As required.
Clean and lubricate all gaskets and Each time seals
O-rings are broken.
Analyzer output calibration 12
Sensor calibration As required.
Cleaning the Sensor
ABB pH/ORP/pION sensors are cleaned using one
or a combination of the following methods.
These are recommendations and may not be
suitable for all applications. Other cleaning
methods may be developed that better suit
particular applications. When cleaning,
observe all safety precautions required for
handling chemicals. When handling chemicals,
always use gloves, eye protection, safety
shield, and similar protective items, and
consult Material Safety Data Sheets.
WARNING Consider the material compatibility between
cleaning fluids and process liquids.
Incompatible fluids can react with each other
causing injury to personnel and equipment
damage.
WARNING Use solvents only in well ventilated areas.
Avoid prolonged or repeated breathing of
vapors or contact with skin. Solvents can
cause nausea, dizziness, and skin irritation.
In some cases, overexposure to solvents has
caused nerve and brain damage. Solvents are
flammable - do not use near extreme heat or
open flame.
Acid Dip
Dip the tip of the sensor into a one to five
percent hydrochloric acid (HCl) solution until
this region is free of the unwanted coating.
Minimize expose of any metal on the sensor, if
present, to this cleaning solution. Corrosion
may occur. This method removes scales from
water hardness. After dipping, rinse sensor
with water.