Endress+Hauser Sensor pH and ORP CPS96D

Remove the protection cap for calibration and measurement

pH/ORP sensors which are stored dry must be immersed in medium for at least 24 hours before use. Otherwise severe value drifting can be expected.

If the protection cap is no longer used to store the sensor, store the sensor in a KCl solution (3 mol/l) or buffer solution (pH 7.00).

The frequency at which a sensor calibration or sensor inspection is performed depends on the operating conditions (fouling, chemical load).

Two-point calibration is required for pH sensors. Use quality buffer from Endress+Hauser, e.g. CPY20.

Note:pH or ORP sensors with Memosens technology do not need to be calibrated when they are connected for the first time. Calibration is only required if very strict accuracy requirements must be met or if the sensor has been in storage for longer than three months.

1. Immerse the sensor into a defined buffer solution (e.g. pH 7 or 220 mV).

2. Perform the calibration at the measuring device:

Clean the sensor before each calibration.

Clean away fouling on the sensor as follows depending on the type of fouling:

Clean with grease remover, e.g. alcohol, as well as hot water and (alkaline) agents containing surfactants (e.g. dishwashing detergent).

2. Lime, cyanide and metal hydroxide buildup and low solubility organic buildup:

Dissolve buildup with diluted hydrochloric acid (3 %) and then rinse thoroughly with plenty of clear water.

Harmful if swallowed. Limited evidence of carcinogenicity. Possible risk of harm to the unborn child. Dangerous for the environment with long-term effects!