Emerson 381 instruction manual Operation

MODEL 381pH/ORP	SECTION 4.0
	ULTRASONIC CLEANER

4.4 Operation (continued)

NOTE

When the ultrasonic cleaner is used on some slurry applications (such as car- bon- ates and phosphates), continuous ultra- sonic cleaning is not recommended as this may tend to compact the solids of the slur- ry on the electrode into a hard, cement like coating. Instead, it is recommended that a shock-type treatment be applied (i.e., for every three hours of operation, employ 30 minutes of ultrasonic cleaning). The inter- val and duration of the cleaning, as well as the power setting utilized, are determined by the individual application. Factors such as the concentration of carbonates or phosphates, flow velocities, temperature, etc., must all be considered.

1.Output Power Adjustment. The output power adjustment on the ultrasonic generator is located on the powerstat. The powerstat is adjusted with the knob marked as PS: (Refer to Figure 4-2), and determines the cleaning efficiency of the unit by adjusting the power input of the generator. Proper adjustment is made by turning the powerstat knob counter-clockwise (minimum power position) and gradually increasing the power, by turning the knob clockwise, until the power is sufficient to keep the electrode clean. This is usually accom- plished over a period of several days.

4.5MAINTENANCE. The ultrasonic cleaner should operate continuously (with the exception of carbonate and phosphate slurries) and requires no maintenance, calibration, or adjustment, except that the power adjustment should be as low as possible consistent with good cleaning action. The ultrasonic transducer is completely sealed and should not be operating while troubleshooting the sensor or transmitter.

1.Troubleshooting. In case problems arise in the functioning of either the generator or the trans- ducer, the entire assembly should be returned to the factory for servicing. No electronic repair work of any kind should be attempted in the field, or the warranty will be voided. Whether the unit is still under warranty or not, field troubleshooting is not recommended, and Rosemount Analytical cannot be liable for operation or safety of equipment that has been repaired or modified by persons other than its factory or their trained and authorized Field Engineers. If your unit’s warranty has expired, and field troubleshooting is still desired, waveforms, frequency and voltages can be obtained directly from Branson Ultrasonic, Eagle Road, Danbury, CT 06810, (203) 796-0400. The circuit is fundamentally identical for both the old and new version.

4.6REPLACEMENT PARTS. The ultrasonic generator may be ordered as a unit (P/N 22990-00). The ultra- sonic transducer is a sealed unit and cannot be conve- niently repaired in the field. While it is not likely that the transducer will fail electrically or mechanically, certain process streams may contain corrosive compounds which, in time could attack and ultimately destroy the 316 Stainless Steel faceplate. The number of spare transducers (P/N 2001463) needed on hand as replacement stock, should be determined on an indi- vidual basis, with regard to specific application condi- tions.

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