137 Measuring with EC Probes
Calibration Messages & Warnings
Message & Description Recommended Action
“Wrong Std”
The reading exceeds the expected
value. Calibration can not be
confirmed.
Check that correct calibration solution
has been used and / or clean the
probe.
“Temperature Error”
The temperature of the solution is out
of temperature compensation interval.
Use fresh calibration solution and / or
clean the temperature sensor.
“Maximum window”
During a process calibration, the
calibration value exceeds upper
boundary value.
Change calibration point value, clear
calibration or exit by pressing the back
key.
22.5. MAINTENANCE
• Clean the probe regularly to prevent debris buildup between rings or blockage of the vent hole (four‑ring
probes).
• Rinse the probe thoroughly as water residue may not be visible.
• Inspect all sensor connectors for corrosion and replace if necessary.
Cleaning
Dirty or improperly cleaned probes can result in erratic and inaccurate readings.
• Remove and inspect the probe during scheduled service intervals.
• Dry clean the sensor with a soft bristle brush to loosen any debris.
For a more thorough cleaning:
•
Use a cloth and warm water with a soapy surfactant to clean and follow with a thorough rinse with purified
(deionized) water. Ensure that the holes and cell channel in the sensor are free of foreign material.
• Flush with purified water after cleaning.
Four‑ring probe cleaning
• Remove and inspect the probe during scheduled service intervals.
• Clean off the external sheath with a soft cloth and surfactant solution.
• Rinse the probe under a stream of running tap water to remove salt or minerals.
• Jet the tap water stream through the opening to dislodge any debris.
• If strictly necessary, carefully remove the outer plastic sheath to disassemble the probe.
Clean with a warm water/surfactant mixture and follow with a through rinsing with purified water.
Allow pieces to dry and reassemble.
Storage
• EC probes should always be stored dry after cleaning in distilled water.
• After long‑term storage or cleaning, calibration is required.
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