Summary of Contents for ROHRBACK COSASCO SYSTEMS CORRATER 9020
- Page 1 Serial Number______________ MODEL 9020 & 9020-OEM ® CORRATER TRANSMITTER USER MANUAL ROHRBACK COSASCO SYSTEMS, INC. 11841 East Smith Avenue Santa Fe Springs, CA 90670 Tel: (562) 949-0123 (800) 635-6898 Fax: (562) 949-3065 P/N 710900-Manual Rev. E 10/07...
- Page 2 © 2002 Rohrback Cosasco Systems, Inc. All rights reserved. CORRATER® is a registered trademark of Rohrback Cosasco Systems, Inc. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without...
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Page 3: Table Of Contents
Contents Chapter 1 Introduction ..................... 1 Chapter 2 Specifications ..................... 3 Chapter 3 Installation ....................5 Chapter 4 Operation ....................11 Appendix A Probe Multiplier Values ................. 13 Appendix B Imbalance Measurement Function of CORRATER Instruments ..............15... -
Page 5: Chapter 1 Introduction
Chapter 1 Introduction ® The Model 9020 CORRATER Transmitter and 9020-OEM Transmitter Module are two- wire CORRATER transmitters which are designed to be directly connected to an industrial plant Distributed Control System (DCS) or other 4-20 milliamp receiver for the purpose of monitoring corrosion rates and imbalance currents from 2-electrode CORRATER probes mounted in water systems. - Page 6 CORRATER Transmitter User Manual Figure 2 - 9020 Transmitter Installed in Enclosure Connection to the CORRATER probe to be monitored is made with the six-foot (two- meter) cable supplied with the instrument. A 5 MPY (mil per year) test probe is provided with the instrument for the purpose of verifying proper instrument operation.
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Page 7: Chapter 2 Specifications
Chapter 2 Specifications ELECTRICAL: #Corrosion Rate Ranges: 0-2, 0-20 and 0-200 MPY #Imbalance Ranges: 0-2, 0-20 and 0-200 Imbalance Units #Measurement Cycle Time: 5, 10, 15 and 20 minutes 0.1% of Full Scale #Resolution: #Alloy Multiplier Range: 0.2 to 2.99 #Ambient Temperature Range: -18ΕC to +60ΕC #Supply Voltage Range:... - Page 8 CORRATER Transmitter User Manual Figure 3 - Dimensions of 9020-OEM Figure 4 - Dimensions of 9020 NEMA Enclosure...
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Page 9: Chapter 3 Installation
Chapter 3 Installation Unpacking Check to make sure that the package contains the following items: Model 9020-OEM or Model 9020 CORRATER® transmitter Six-foot probe-to-instrument cable with Type B connector P/N 710920 Test Probe (to verify 9020 instrument operation only) User Manual Note: All 9020-OEM and 9020 system components are carefully tested, inspected and packaged prior to shipment. - Page 10 CORRATER Transmitter User Manual Figure 5 - Mounting hole dimensions on transmitter. The Model 9020 is intended to be field mounted on a panel, wall or other vertical surface. The NEMA 4X enclosure is mounted using four #1/4" machine screws through the mounting feet.
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Page 11: Electrical Connections
Figure 6 - Mounting hole dimensions on enclosure. Electrical Connections The electrical connections are the same for either the 9020-OEM or the 9020 with the exception that the probe and 4-20 mA. loop cables enter the 9020 enclosure through sealing glands. - Page 12 CORRATER Transmitter User Manual Figure 7 - Drawing showing termination of cable to Probe terminal strip including wire colors and termination of shield to the ground lug. If possible, the 9020-OEM and 9020 should be grounded to the system ground in order to maximize noise immunity.
- Page 13 Verification of Instrument Operation To verify the proper operation of the 9020-OEM or 9020 instrument, the P/N 710920 Test Probe is used. The test probe should be connected to the connector on the end of the probe cable and the switches on the transmitter set in accordance with the following: Switch Position Value...
- Page 14 CORRATER Transmitter User Manual obtained, then a shorter time cycle can be selected as long as the readings do not increase substantially (>5%) over the readings taken with a 20 minute cycle. Set the ALLOY MULTIPLIER switches to the appropriate multiplier value for the metal or alloy of the electrodes as shown in the chart of Appendix 1.
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Page 15: Chapter 4 Operation
Chapter 4 Operation After the initial measurement cycle is completed, the transmitter will update the loop current at the completion of each measurement cycle. If logging this data, it is not necessary to sample the loop current more often than once each measurement cycle. To convert the 4-20 mA. - Page 16 CORRATER Transmitter User Manual...
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Page 17: Probe Multiplier Values
Appendix A Alloy Multipliers NOTE: These factors are recommended for use with the 9020 instrument when setting the MULTIPLIER value, as ® described in Chapter 3. They are based upon use of CORRATER electrodes which have surface areas of 5cm "standard"... - Page 18 CORRATER Transmitter User Manual...
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Page 19: Imbalance Measurement Function Of Corrater Instruments
Appendix B IMBALANCE MEASUREMENT FUNCTION OF CORRATER INSTRUMENTS Metal surfaces, no matter how uniform they may appear, have numerous microscopic imperfections. Metals such as iron alloys are crystalline in structure and surface imperfections such as small intergranular cavities will tend to grow, especially in liquids that have large concentrations of dissolved oxygen. - Page 20 CORRATER Transmitter User Manual material in the aqueous environment. This is the measurement technique that it is utilized in CORRATER instruments to provide a qualitative measure of pitting tendency. In CORRATER instruments, the imbalance (or pitting) units have been established to be 2.5 microamperes (µa.) which scales to a current density of 0.5µa./cm (the ...
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