Model 300 Retractable pH/ORP Sensor

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RETRACTABLE SENSOR can be easily removed and replaced under pressure without process shutdown. PLUG-IN COMBINATION ELECTRODE CARTRIDGE is simple to replace thus reducing labor costs. LONG-LIFE, SINGLE OR DOUBLE JUNCTION REFERENCE ELECTRODE provides longer service life in applications where poisoning ions are present. INTEGRAL PREAMPLIFIER provides noise free long distance transmission of the high impedance pH signal. WEATHERPROOF JUNCTION BOX permits installation in most environments.

FEATURES AND APPLICATIONS The Rosemount Analytical Model 300 pH/ORP Sensor is designed to meet a wide variety of industrial applications. It has been specially designed for applications where the process cannot be shut down and a separate sample stream is difficult or impossible to provide. Paper pulp stock lines and reaction towers are typical applications. SENSOR The Model 300 Retractable pH/ORP Sensor is designed for use with a standard one inch ball valve. This makes it ideal for replacing or updating any manufacturer's existing retractable pH/ORP sensors without process shut-down. Initial installations can even be accomplished without process shut-down by hot-tapping a one inch ball valve at the desired point of measurement. Sensor removal is accomplished by loosening the hex nut of the male connector and retracting the sensor until it reaches the built-in mechanical stop (no cables or chains are required for retraction). The ball valve may then be closed, the male connector completely detached and the sensor pulled out of the ball valve assembly. After the Model 300 is removed from the process, the disposable electrode cartridge can easily be replaced by removing the threaded cartridge housing, discarding the old cartridge and replacing it with a new one. Once the cartridge housing is replaced, the sensor assembly is ready to be put back into the process. COMBINATION ELECTRODE CARTRIDGES There are two types of combination electrode cartridges: the side bulb design and the end bulb design. The side bulb design is made of CPVC material and comes with a double junction gel filled reference cell while the end bulb design is made of PPE (Polyphenylene Ether) material and comes with a long, single junction gel-filled reference cell. The end bulb cartridge may be installed in slip streams. Several types of pH measuring electrodes are offered: general purpose glass, high-pH glass, and ruggedized glass (for higher temperatures or abrasive processes). A platinum electrode (Option 13) is available for ORP measurements. A custom seal prevents moisture from reaching the high impedance connection at the back of the electrode. The plug-in style solid state preamplifier is housed in the weatherproof junction box as an integral part of the sensor. This preamplifier provides noise-free, long distance transmissions of the pH/ORP signal to an analyzer, such as the Models 1181, 1054 Series, 2054, and 2081. U.S. Patent No. 4,783,252