pH/ORP Sensor

1 pH/ORP SensorInstruction ManualPN 51-381 2010 Model 381 CAUTIONSENSOR/PROCESSAPPLICATION COMPATIBILITYThe wetted Sensor materials may notbe compatible with process com -position and operating compat ibility is entirely theresponsibility of the AREA INSTALLATIONI nstallations near flammable liquids or in haz-ardous area locations must be carefully eval-uated by qualified on site safety Sensor is notIntrinsically Safe orExplosion Proof. To secure and maintain an intrinsically safeinstallation, the certified safety barrier,transmitter, and Sensor combi nation mustbe used. The installation system must com-ply with the governing approval agency (FM,CSA or BASEEFA/CENELEC) hazardousarea classification requirements.

2 Consultyour analyzer/transmitter instruc tion manualfor installation, operation and servicingof this Sensor in a Hazardous Area Instal -lation is entirely the responsibility of the INSTRUCTIONSREAD THIS PAGE BEFOREPROCEEDING!Rosemount Analytical designs, manufactures, and tests itsproducts to meet many national and international stan-dards. Because these instruments are sophisticated tech-nical products, you must properly install, use, and maintainthem to ensure they continue to operate within their normalspecifications. The following instructions must be adheredto and integrated into your safety program when installing,using, and maintaining Rosemount Analytical to follow the proper instructions may cause any oneof the following situations to occur: Loss of life; personalinjury; property damage; damage to this instrument; andwarranty invalidation.

3 Read all instructions prior to installing, operating, andservicing the product. If this Instruction Manual is not thecorrect manual, telephone 1-800-654-7768 and therequested manual will be provided. Save this InstructionManual for future reference. If you do not understand any of the instructions, contactyour Rosemount representative for clarification. Follow all warnings, cautions, and instructions marked onand supplied with the product. Inform and educate your personnel in the proper installa-tion, operation, and maintenance of the product. Install your equipment as specified in the InstallationInstructions of the appropriate Instruction Manual andper applicable local and national codes. Connect allproducts to the proper electrical and pressure sources.

4 To ensure proper performance, use qualified personnelto install, operate, update, program, and maintain theproduct. When replacement parts are required, ensure that quali-fied people use replacement parts specified byRosemount. Unauthorized parts and procedures canaffect the product s performance and place the safeoperation of your process at risk. Look alike substitutionsmay result in fire, electrical hazards, or improperoperation. Ensure that all equipment doors are closed and protec-tive covers are in place, except when maintenance isbeing performed by qualified persons, to prevent electri-cal shock and personal Process ManagementRosemount Analytical Barranca ParkwayIrvine, CA 92606 USATel: (949) 757-8500 Fax: (949) 474-7250 Rosemount Analytical Inc.

5 2001 MODEL 381 pH/ORPTABLE OF CONTENTSMODEL 381 pH/ORP SENSORTABLE OF AND and Information .. Installation (Code 02).. Installation (Code 00) .. Through Installation (Code 03) .. Powered Cleaner Installation (Code 04).. and 381 pH and 381 .. Troubleshooting .. Element CLEANER .. OF OF TABLEST able of Saturated Quinhydrone Solutions (in Millivolts).. vs. Resistance of Auto TC R1 Values for Temperature Compensation Elements ..183-4 Model 381 Spare 381 pH/ORPTABLE OF CONTENTSMODEL 381 pH/ORP SENSORLIST OF FIGURESF igure No. TitlePage1-1 Dimensional Drawing ..31-2 Mounting Drawing ..32-1 Model 381 Sensor Component Locator Installation Diagram ..82-3 Insertion Installation Through Installation Diagram (Code 03 or 04).

6 92-5 Installation Details Low Flow Conditions Model 381 (Code 03-04)..92-6 Retro-Fit Kit and Code-04 Flow Powered Cleaner, Model 381 ..102-7 Flow Through Diagram and Wiring (Code 03 or 04) ..112-8 Remote Junction Box with Internal with Weatherproof or Div. 2 (Code 2) Junction Box ..134-1 Model 381 Ultrasonic Cleaner and and Component Locator Ultrasonic This DocumentThis manual contains instructions for installation and operation of the Model 381pH/ORP following list provides notes concerning all revisions of this LevelDateNotesA6/94-1/00 This is the initial release of the product manual. The manual has been reformatted to reflect the Emerson documentation style and updated to reflect any changes in the product multiple drawings throughout page 3 code 00 insertion is no longer MOLDED POLYETHERSULFONE (PES) BODY provides compatibility with a variety ofprocesses.

7 MODULAR DESIGN facilitates maintenance by eliminating terminal and mounting bracketsand extraneous hardware. INTEGRAL PREAMPLIFIER provides reliable signal transmission. DOUBLE JUNCTION, GEL-FILLED, REFERENCE CELL provides high temperature per-formance, extended service life, and resists the effects of pumping, dilution and contami-nation. OPTIONAL FLOW-POWERED OR ULTRASONIC CLEANING provides trouble-free serv-ice in difficult FEATURES AND APPLICATIONSThe Model 381 Sensor measures the pH or theOxidation Reduction Potential (ORP) of aqueous solu-tions in pipelines, open tanks or ponds. The Sensor isused in most industrial applications including SO2scrubbers, rinse tanks, plating baths, reverse osmosisunits, and water and waste treatment Sensor is housed in a molded PES body and hastwo O-ring seals with breach lock threads whichsecure the PES cover.

8 This provides a waterproofunion for long operating life and easy removal for rou-tine modular body design eliminates the need forinternal mounting brackets, terminal brackets andscrews. All components are screw-type or plug-in-place, allowing for fast simple integral preamplifier amplifies the high imped-ance glass electrode signal at the Sensor , providing atransmission capability of up to three miles. TheRosemount Analytical Inc. method of preamplificationhas become the industry standard for reliable pHmeasurement. In submersion applications at tempera-tures greater than 80 C, the preamplifier must belocated in a remote junction standard feature of the Model 381 is the doublejunction, gel-filled reference cell which reduces theneed for special applications engineering whereunknown reference cell contamination, such as sul-fides, may exist.

9 The gel solution maintains its viscosi-ty at high temperatures, and resists the effect ofpumping and dilution, resulting in an extended servicelife. A choice of wood (Code 20) or ceramic (Code 21)liquid junction is available to provide resistance tofouling and subsequent loss of electrical contactbetween the reference electrode and process flow applications where crystalline or viscous coat-ings, such as calcium carbonate or petroleum oils,may coat the electrode surfaces and impede the sen-sor's performance, the flow-powered cleaning option(Code 04) may be used. A specially designed flowchamber directs the process fluid in a circular pathcarrying three Teflon1balls which clean the electrodesurface, physically preventing accumulation of coatingmaterials.

10 Flow-powered cleaning is suitable for allhazardous area submersion (Code 02) applications, the ultrasoniccleaning option may be specified. This assemblyincludes the ultrasonic transducer and generator,mounting hardware, and 20 ft. of interconnectioncable. Ultrasonic cleaning is not suitable for haz-ardous area Model 381 is compatible with all RosemountAnalytical pH/ORP analyzers. For use with the1054/2054 Series, 2081 and other pH analyzerswhich utilize a PT-100 automatic temperature com-pensator order the Model 381 381 pH/ORPSECTION AND SPECIFICATIONSSECTION AND SPECIFICATIONS1 Teflon is a registered trademark of du Pont de Nemours & 381 pH/ORPSECTION AND Sensor SPECIFICATIONSM aterials of Construction:Body, Cover and Flow Cell: Polyethersulfone (PES).