Model 385+ Retractable/Submersion/Insertion pH/ORP Sensor

---

ADVANCED on-line SENSOR DIAGNOSTICS for use with the Model 54 pH/ORP Analyzer, 3081 pH/ORP Transmitter, or 81 pH/ORP Transmitter. RETRACTABLE version allows safe removal and replacement under pressure without process shutdown. LONG-LIFE, TRIPLE JUNCTION REFERENCE ELECTRODE provides longer service life in applications where poisoning ions are present. DISPOSABLE TEFZEL¹AND TITANIUM DESIGN provides maximum chemical resistance and economic advantage where minimal troubleshooting and maintenance downtime are of prime importance.

FEATURES AND APPLICATIONS The Rosemount Model 385+ Sensor is designed to provide advanced sensor diagnostics* available with the Model 54 pH/ORP Analyzer, 3081 pH/ORP Transmitter, and the 81 pH/ORP Transmitter. (Please refer to the Model 54 pH/ORP or the Model 3081/81 pH/ORP Product Data Sheets for complete information.) These advanced sensor diagnostics provide preventative maintenance by notifying the operator to replace an aged sensor or clean a fouled sensor for continuous optimum performance. The Model 385+ Sensor measures the pH or ORP (Oxidation Reduction Potential) of aqueous solutions in pipelines, open tanks, or ponds. It is suitable for applications where a low cost, industrial, disposable sensor is required. The combination electrode features a peripheral ceramic junction. The triple junction reference cell provides longer life in processes containing sugar, ammonia, chlorides, sulfides or other poisoning ions. The Model 385+ body is constructed of molded, chemically resistant Tefzel in two standard body versions. The retraction version is housed in a titanium tube, with a plug-in style surface mount preamplifier in a weatherproof junction box. It is designed for use with a standard 1-1/2 in. ball valve assembly for process mounting where a separate sample stream is difficult or impossible to provide. The entire installation process is accomplished without line depressurization and minimal process fluid loss. Following sensor removal from the ball valve, maintenance and replacement is easy. The insertion/submersion version has two body configurations: 25 ft (7.6 m) integral cable and preamplifier; 15 ft (4.5m) integral cable for use with remote preamplifier. ¹Tefzel is a registered trademark of E.I. du Pont de Nemours & Company * Patent pending