EXA PH200/400 and EXA PH202/402 Troubleshooting and Error Code Guide
●Introduction
■The EXA Series of Instruments (EXA PH200，PH400，PH202,PH402) provide much more than just a measurement. They are also a tool, providing both on-line and off-line diagnostics of the components making up the measurement loop (sensors,cabling and Analyzer or Transmitter).These diagnostics serve two key functions:
▲l)Status Information: In the DISP (display) section of the Message Display , information concemning the status ofkey components is available. As an example, the Impedance value of the Reference Electrode can be checked by using the YES/NO keys and stepping through the DISP section until the RZ value is reached.
▲2) Failure Alarm: The diagnostic program contimually checks key functions and components of the measturement loop for problems and provides information to the operator via Emor Codes on the dual LCD display.These Error Codes are designed to lead the operator to the source of the problem as quickly as possible and offer suggestions for correction.
■To properly utilize the information provided by these Error Codes the user should first determine the following:
▲l) Under what circumstances the Fault occurred: Was it at start-up, or had the unit been on-line for awhile?This will help determine if the problem is related to a new installation or whether an electrode has been on-line long enough that it may need replacement.
▲2)What Sensor mounting assembly and specific electrodes are being used:Is the best electrode for the application being used?Often an electrode that works fine in one application, is moved to an entirely different one for which it was not designed and consequently does not perform well. The misapplication is the problem, but the equipment is incorrectly blamed and often replaced unnecessarily.
▲3) The Process Parameters，including temperature, chemical make up and whether it is a batch or continuous operation: Sometimes the actual process is changed. When this happens problems often begin to occur with pH equipment.By redefining the process, it is usually a simple matter to discover the reason for the current problems.By changing to different electrodes, modifying the installation or moving to a different measuring point will resolve the problem.
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EXA 、 EXA PH200 、 EXA PH400 、 EXA PH202 、 EXA PH402 、 EXA202 、 EXA 200 、 EXA402 、 EXA 400 、 EXA200 、 PH202 、 PH402 |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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May 30,2012 |
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TNA 1211 |
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544 KB |
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