Orion Instruments Eclipse 705 - Manual (Page 46)

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3.3.3 Troubleshooting Applications
There are numerous causes for application problems.
Media buildup on the probe and stratification are covered
here. Media buildup on the probe is not a problem in most
cases —ECLIPSE circuitry typically works very effectively.
Media buildup should be viewed as two types—Film
Coating and Bridging. A twin rod probe can be utilized
when minor film coating is a possibility. For more extreme
buildup, utilize the Model 7xF or 7x1 Single Rod Probes.
3.3.3.1 Model 705 (Level Application)
• Continuous Film Coating
The most typical of coating problems where the media
forms a continuous coating on the probe. ECLIPSE will
continue to measure effectively with some small degrada-
tion in performance. A problem can develop if the product
begins to build up on the spacers that separate the probe
elements. High dielectric media (e.g., water-based) will
cause the greatest error.
• Bridging
Media that is viscous or solid enough to form a clog, or
bridge, between the elements causes the greatest degrada-
tion in performance. High dielectric media (e.g., water-
based) will show as level at the location of the bridging.
• Stratification/Interface
The standard Model 705 ECLIPSE transmitter is designed
to measure the first air/media interface it detects. However,
a low dielectric over a high dielectric application can cause
a measurement problem and cause the electronics to trigger
on the high dielectric medium that lies beneath the low
dielectric medium. Select the Fixed Threshold option to
read the upper medium. Example: Oil over water.
3.3.3.2 Model 705 (Interface Application)
It is not uncommon for interface applications to have an
emulsion layer form between the two media. This emulsion
layer may pose problems for Guided Wave Radar as it may
decrease the strength of the reflected signal. Since the prop-
erties of this emulsion layer are difficult to quantify, appli-
cations with emulsion layer should be avoided with ECLIPSE.
Film
Coating
Bridging
57-600 Eclipse ® Guided Wave Radar Transmitter
Low Dielectric
Medium
(e.g., oil)
High Dielectric
Medium
(e.g., water)
Emulsion Layer