Common Features

pHD™ Differential Electrode Measurement Technique.
This field-proven technique uses three electrodes instead of the two normally used in conventional pH sensors. Process and reference electrodes measure the pH differentially with respect to a third ground electrode. The end result is unsurpassed measurement accuracy, reduced reference junction potential, and elimination of sensor ground loops. These sensors provide greater reliability,
resulting in less downtime and maintenance.

Patent Applied For.
Back in 1970, GLI invented the Differential Electrode Technique for pH measurement applications and patented its design. The pHD™ sensors series (patent applied for) takes this field-proven technology to a new level. service.

Replaceable Salt Bridge/ Protector.
The unique, replaceable salt bridge holds an extraordinary volume of buffer to extend the working life of the sensor by protecting the reference electrode from harsh process conditions. The salt bridge simply threads onto the end of the sensor if replacement is needed.

Built-in Encapsulated Preamp.
Encapsulated construction protects the sensor’s built-in preamp from moisture and humidity, ensuring reliable sensor operation. This preamp produces a strong signal, enabling the sensor to be located up to 3000 ft. (914 m) from the analyzer.

„Durable PEEK® Body Material.
The pHD™ Differential pH and ORP sensors feature a durable PEEK® body for chemical compatibility with most process solutions. For less aggressive solutions, GLI offers a Ryton® sensor in a convertible style for pH and ORP measurement.

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