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Note: Cleaning can be process-specific.
Some users will have to develop a procedure that works best for them.
Many types of deposits can be removed by wiping the electrodes with a cloth, brush, or paper towel and then rinsing with clean water.
Additional deposits may be removed by soaking in water and detergent. In general, never use a cleaner that contains a skin softener
such as aloe or lanolin. These can coat the electrode. Powdered Alconox™ and Dawn™ are known to work well.
Stubborn mineral deposits may be removed by soaking in dilute hydrochloric acid (about 0.1 M to 1.0 M). HCl will in time, attack both
316 stainless steel and titanium, so the cell should be soaked no longer than required. Rinse the cell to remove the acid.
Oily deposits may be removed with a solvent such as alcohol or acetone. Assure that the sensor body in compatible with the solvent.
A mild alkaline cleaner such as Alconox Solujet™ may also work.
Rinse or soak the cell in clean water before returning to service.
Caution: Ensure that a dangerous chemical reaction will not occur between process deposits and the
cleaning solution, such as compounds of cyanide, and the hydrochloric acid. Cyanide is often used in
electroplating and in gold refining. If in doubt check with a chemist.
Caution: When using dangerous chemicals such as hydrochloric acid or chlorine bleach, use all
appropriate safety precautions, especially eye protection.
4.4
Toroidal Conductivity
The toroidal conductivity sensor head has a number of physical features that should be noted. The connector is keyed. The key provides
protection for the pins during installation. To insure that pins remain free of moisture and dirt, a rubber boot is supplied with replacement
sensor heads and should be kept in place when the sensor is being transferred or placed in storage. In very humid or dirty environments,
we also recommend applying some electrical grease to the connector pins.
Keep the O-Ring and the shaft of the sensor free of dirt. Be sure the DataStick cavity is also free of dirt and moisture prior to insertion.
Connector Key
Gold Pins
Encapsulated
Product Number/
Serial Number
4.4.1
Toroidal Conductivity Overview
When an ORP sensor head is installed in the DataStick, AquaComm™ will automatically display millivolts, temperature, sensor type
and DataStick serial number. Pull-down menus will also automatically provide calibration, configuration and diagnostic choices for
toroidal conductivity.
Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
O-Ring
Water tight seal
Retaining Ring
Locks the sensor head
into the DataStick body
66
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Troubleshooting
