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Application Troubleshooting
Media buildup on the probe and stratification are common application concerns. Media
buildup on the probe is not a problem in most cases, but when it occurs, it can be viewed
as two types: Film Coating and Bridging. A twin rod probe can be used when minor film
coating is a possibility. For more extreme buildup, use the Model 7ML1303 or
7ML1304 Single Rod Probes.
Level Applications
7ML19985KA02
Continuous Film Coating
The most typical of coating problems where the media
forms a continuous coating on the probe. SITRANS
LG200 will continue to measure effectively with some
small degradation in performance. A problem can
film
develop if the product begins to build up on the spacers
coating
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
bridging
degradation in performance. High dielectric media (e.g.,
water-based) will show as level at the location of the
bridging.
Stratification/Interface
The standard SITRANS LG200 transmitter is designed to
measure the first air/media interface it detects.
However, a low dielectric over a high dielectric
low
application can cause a measurement problem and
dielectric
medium
cause the electronics to trigger on the high dielectric
(oil)
medium that lies beneath the low dielectric medium.
emulsion
layer
Select the Fixed Threshold option to read the upper
high
medium. Example: Oil over water.
dielectric
medium
(water)
SITRANS LG200 – INSTRUCTION MANUAL
Page 79
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