Fisher-Rosemount SCS 921 Instruction Manual
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Fisher-Rosemount SCS 921 Instruction Manual

Total chlorine monitoring system
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Instruction Manual
PN 510SCS921
Model SCS 921
March 2000
Total Chlorine
Monitoring System

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Summary of Contents for Fisher-Rosemount SCS 921

  • Page 1 Instruction Manual PN 510SCS921 Model SCS 921 March 2000 Total Chlorine Monitoring System...
  • Page 2 WARNING ESSENTIAL INSTRUCTIONS ELECTRICAL SHOCK HAZARD READ THIS PAGE BEFORE PROCEEDING! Making cable connections to and servicing Rosemount Analytical designs, manufactures, and tests this instrument require access to shock haz- its products to meet many national and international stan- ard level voltages which can cause death or dards.
  • Page 4 CAUTION DANGER SENSOR/PROCESS HAZARDOUS AREA INSTALLATION APPLICATION COMPATIBILITY Installations near flammable liquids or in haz- Wetted materials may not be compati- ardous area locations must be carefully eval- ble with process composition and uated by qualified on site safety personnel. operating conditions.

  • Page 5: Table Of Contents

    MODEL SCS 921 TABLE OF CONTENTS MODEL SCS 921 TOTAL CHLORINE MONITORING SYSTEM TABLE OF CONTENTS Section Title Page 1 1 . . 0 0 D D E E S S C C R R I I P P T T I I O O N N A A N N D D S S P P E E C C I I F F I I C C A A T T I I O O N N S S ......................
  • Page 6 TABLE OF CONTENTS TABLE OF CONTENTS CONT'D. LIST OF FIGURES Figure No. Title Page Recommended Arrangement of Analyzer & Sample Conditioning System. Dimensions of SCS 921 Case..............Schematic of Sample Conditioning System & Total Chlorine Analyzer ..Sample Conditioning System ..............

  • Page 7: Specifications

    DESCRIPTION AND SPECIFICATIONS SECTION 1. DESCRIPTION AND SPECIFICATIONS The SCS 921 is a sample conditioning and measuring system for the continuous determination of total chlorine in water. The conditioning system continuously pumps buffered potassium iodide reagent into the sample. Free and combined chlorine (also called total chlorine) convert the iodide to iodine.

  • Page 8: Ordering Information

    ORDERING INFORMATION AND ACCESSORIES Model SCS 921 Sample Conditioning System. The SCS 921 is used for the continuous determination of total chlorine in water. The SCS 921 consists of a sample conditioning system, a sensor, and an analyzer. Order reagent separately.
  • Page 9 MODEL SCS 921 SECTION 1 DESCRIPTION AND SPECIFICATIONS ACCESSORIES - Sample Conditioning System DESCRIPTION WEIGHT* SHIP WEIGHT* 9380080 Peristaltic pump for reagent, 115 Vac 2 lb (1.0 kg) 2 lb (1.0 kg) 9380086 Peristaltic pump for reagent, 230 Vac 2 lb (1.0 kg) 2 lb (1.0 kg)

  • Page 10: Unpacking And Inspection

    Figure 2-1. Install the grab sample point as close as possible to the sample line supplying the SCS 921. Be sure that opening the grab sample valve does not appreciably alter the flow of sample to the instrument. If the SCS 921 is measuring dechlorinated water, provide a way of substituting a chlorinated water sample for the dechlori- nated sample.
  • Page 11 MODEL SCS 921 SECTION 2 INSTALLATION MILLIMETER INCH DWG. NO. REV. 4502393 FIGURE 2-2. Dimensions of SCS 921 Case...
  • Page 12 SECTION 3. PRINCIPLES OF OPERATION See Figure 3-1. A pressure regulator and valved rotameter control the flow of sample through the SCS 921. From the outlet of the rotameter the sample enters a mixing tee. A constant speed peristaltic pump delivers reagent to the mixing tee.

  • Page 13: Install The Sensor

    MODEL SCS 921 SECTION 4 START-UP SECTION 4. START-UP Figure 3-1 Figure 3-2. INSTALL THE SENSOR 1. From inside the cabinet, thread the sensor cable through the gland on the upper-left side. Leave about one foot of cable inside the cabinet. Remove the protective cap from the end of the sensor.

  • Page 14: Start The Air Flow And Zero The Sensor

    MODEL SCS 921 SECTION 4 START-UP START THE AIR FLOW AND ZERO THE SENSOR 1. Place the reagent tube in a container of water or leave in air. 2. Turn the power switch on. The peristaltic pump and the air pump will start.
  • Page 15 MODEL SCS 921 SECTION 5 CALIBRATION SECTION 5. CALIBRATION Calibrate the system when the sensor membrane is replaced or when other maintenance is performed on the sen- sor. Check the calibration of the system every time the sample conditioning reagent is replaced.

  • Page 16: Inspection

    MODEL SCS 921 SECTION 6 MAINTENANCE AND TROUBLESHOOTING SECTION 6. MAINTENANCE AND TROUBLESHOOTING INSPECTION. Periodically inspect tubing for cracks and leaks. Replace tubing if it appears to be damaged. Tubing downstream from the reagent injection point turns yellow after a few days in service.

  • Page 17: Troubleshooting

    MODEL SCS 921 SECTION 7 TROUBLESHOOTING TROUBLESHOOTING SYMPTOM ACTION Sensor cannot be zeroed. 1. Allow time for readings to stabilize, particularly after doing sensor maintenance. It may take the sensor as long as 12 hours to stabilize. 2. Examine the membrane. Replace it if it appears to be damaged. Discard and replace the sensor electrolyte.
  • Page 18 United Arab Emirates FINLAND SINGAPORE Bayswater, Victoria (971)(4)835235 Oy Valment-Rosemount Fisher-Rosemount (61)(39)721-0200 MALAYSIA Singapore AUSTRIA ESPOO Rosemount Instruments Pte, Ltd Fisher-Rosemount - AG (358)(9)549-541 SDN BHD (65)777-8211 Neudorf Kuala Lumpur FRANCE SLOVAK REPUBLIC (43)(2236)607 (60)(3)244-5688 Fisher-Rosemount S.A. Fisher-Rosemount scr BELGIUM Lyon...
  • Page 19 WARRANTY Goods and part(s) (excluding consumables) manufactured by Seller are warranted to be free from defects in work- manship and material under normal use and service for a period of twelve (12) months from the date of shipment by Seller. Consumables, pH electrodes, membranes, liquid junctions, electrolyte, O-rings, etc. are warranted to be free from defects in workmanship and material under normal use and service for a period of ninety (90) days from date of ship- ment by Seller.
  • Page 20 $10.00 U.S. Dollars The right people, the right answers, right now. UNILOC DIVISION CUSTOMER SUPPORT CENTER 1-800-854-8257 ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE http://www.RAuniloc.com Credit Cards for U.S. Purchases Only. Rosemount Analytical Inc. Uniloc Division 2400 Barranca Parkway Irvine, CA 92606 USA Tel: (949) 863-1181 http://www.RAuniloc.com...

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