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 TABLE 7-1. Level
Meter
Selection
Guide
Application Requirements
Submerged
and Site Conditions
Bubbler
Ultrasonic
Probe
Factors
Affecting
Accuracy
Performance
Silting in
Excellent
Use
with
caution Very good*
Not
recommended
High
crosswinds
Excellent
Excellent
Floating
debris
Poor
Excellent
Ecellent
Ecellent
Suspended
solids
r e c o m m e n d e d Very good*
Not
(high
concentration)
High grease concentration
Not recommended
Very good*
Excellent
F o a m on liquid
Excellent
Not
recommended
Excellent
Excellent
Narrow
channel
Excellent
Use with caution
Factors
Necessitating
Onsite
Maintenance
Maintenance
Required
Silting
in
Often
None to
None
occasional*
Suspended
solids
None to
Often
None
occasional*
High
grease
concentration
Often
None
occasional*
Channel
Application
Installation
Weirs and flumes
Very easy
Easy
Very easy
Small round pipes
Moderately
easy
Easy
Very easy
Difficult
Large round pipes with
Easy
Difficult
swift current
Somewhat
Easy
Irrigation channel or
Somewhat
difficult
small stream
difficult
Difficult
Easy (if struc-
River or other large
Difficult
ture over
stream
stream
exists)
*Probes
are
only
affected
by
a
mixture
of
grease
and
solids.
7-11
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