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| 11/19/2011 10:51 PM | |
Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12294 Rating:
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Hello Capercanuck; Generally speaking, you must select any instrument based on its performance in specific environmental conditions. The ST-H ultrasonic level transducer is limited to a maximum of 60 or 73 degrees C, depending on the model. So an ambient temperature of 120 degrees C will probably destroy some of the electronics inside. The first recommended step is to examine whether you can remove the transducer from its excessive temperature environment, and still maintain the quality of readings required for the process; this will depend on the temperature gradient in the tank and the reading range of the transducer, If this is not possible, you will have to think of a replacement transducer, one that is better suited to the environemental conditions. If you look at other similar transducers offered here, you will see that the Echomax XLTis rated to 150 degrees C, for example, so it seems better suited to your environment. http://www.automation.siemens.com/w1/automation-technology-transducers-18732.htm Of course you cannot presume that this is a one-to-one replacement of your ST-H transducer, and you would have to study the implications of installation hardwareand range of readings on your process. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 11/19/2011 11:00 PM |
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| 11/21/2011 10:06 PM | |
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Posts: 74 Rating:
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Hello capercanuck So you must be in Canada, eh? As am I. Many have chosen the ST-H for its 2" process connection which makes replacing them with a high temp version somewhat difficult, due to the larger diameter. Somewhat elevated tempertures will cause failure of the bonding of the transducer nosecone with the internal components, severly reducing the power output and the receive sensitivity. Extremely elevated tempertures will damage the internal crystals and possibly the electronics (diodes for switching and an IC for temperture sensing) For liquids, the high temperature transducer would be the XCT. The XLT would be for long range solids. Whatever the solution, you should discuss the application requirements with your suppliers. Or you could use the tech support system at Siemens, which covers all of teh Industry Automation products. www.support.automation.siemens.com/ Best regards Toppie [ |:) |
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