Model PH18 Differential pH Sensor

The model PH18 differential pH sensor is unique and offers the possibility or maintenance free operation for the correct application.

Construction of the enamel coated probe is based on a rigid steel rod. A blue base enamel is over-laid with two yellow bands of sensitive enamel. A pH sensitive enamel and sodium ion enamel are combined with a rhodium liquid earth electrode and a temperature sensor.

The differential probe measuring principle combines the normal potential generated by the pH enamel with the potential from a sodium membrane. In suitable applications the level of sodium ions creates a stable reference voltage. Hence the measurement can be made without a conventional reference electrode, and drawbacks associated with a liquid junction.

The sensitive membranes are directly bonded to a metallic substrate, which eliminates the need for conventional internal reference elements. This unique construction makes the PH18 independent of the drift which can be caused as reference elements age or become contaminated. When used in a system which is cleaned and/or sterilized with hot water or steam, the membranes produce a signal which has long term stability unrivaled by conventional systems.

The use of this sensor is highly application specific. Your local Yokogawa sales office will be please to advise on the suitability of your application, on receipt of the completed application data sheet. Any and all information received by Yokogawa will be treated in the strictest confidence.

 Sterilizable pH sensor

 All enamel construction

 No reference electrode or junction

 Easy installation and commissioning

 No routine maintenance

 Flexible installation options

 140 ºC, 15 bar (284 ºF, 214 psi)

 Specifications

 Manual