Accusonic 8510+ series Reference Manual
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Contents
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B-1A P P E N D I X BTransducer MaintenanceUltrasonic transducers require little maintenance. They need attention only when the signal shows signs ofdeterioration. The following safeguards apply: The connector-ends of transducers - those which lie outside of the conduit - should be protected fromthe weather and from vermin so as to retain electrical integrity. Devices not in service should be protected from the weather and extreme humidity (95% max) andstored at a temperature between -20°C and 60°C.Signal DeteriorationAfter a period of time, the signal level of the transducer signal may deteriorate. This is usually due to thegrowth of algae or buildup of mineral deposits on the face of the transducer. The rate at which foreignmatter builds up on a transducer face varies, depending on the ambient water conditions. Under normalwater conditions, Accusonic recommends that transducer signals be checked for deterioration monthly atfirst, and then annually. Under severe conditions, more frequent testing may be appropriate. The simplestmethod is to monitor the AGC values for each path. See path variables Gain in Chapter 7, Variables.In many cases, signal deterioration may be caused by loose, wet, frayed, or worn transducer cables orconnections. When signal deterioration is observed or suspected, be sure to check the wiring beforeassuming that foreign matter has built up on the transducer face or that there is trouble with the transduceritself. Consult the procedures given in Transducer and Cabling Checkout in Chapter 4, on 4-5 to test andprove out the transducer wiring and external junctions. If signal strength drops below acceptable levels, theappropriate action to be taken depends on the type of the transducer.For internal mount transducers (Models 7630 and 7634) - most of which are installed with dual activeelements - try switching elements to see if the problem clears up. If not, the only option is to run theflowmeter with a path shut down (which degrades accuracy), switch on path substitution (which alsodegrades accuracy), or to dewater the pipe and clean, inspect, and possibly replace the unit.Note: When switching to a backup element in a dual-element transducer, it is necessary tochange the path parameters Path length and Path angle accordingly; unless the elements on bothends of the path are changed. |
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