300-R010-45L Datasheet, PDF (6/12 Pages) Magnetrol International, Inc. – Echotel® Model 300/301 Ultrasonic Non-Contact Transmitter For Level, Volume, and Open Channel Flow

MEASUREMENT RANGE CALCULATIONS
MEASUREMENT RANGE EXPECTATIONS
Ultrasonic non-contact devices are typically rated for a
maximum range in ideal conditions. Experience has
shown that maximum range must be adjusted for cer-
tain factors. Although the maximum range rating is
somewhat conservative, each application must be
evaluated for specific conditions.
The operating parameters listed below can impact the
maximum range of measurement:
• Surface agitation
• Vapors and steam (as measured by temperature
difference between liquid and air)
• Beam spread interference
• Sensor alignment
• Foam
• Dust
• Air movement
• Ambient temperature
• Pressure
Sensor alignment
Temperature
Pressure
Beam spread
interference
Air movement
Beam spread
interference
Vapors
Surface
agitation
Dust
Foam
HOW TO CALCULATE
To estimate how successful a particular application may
be, using the chart on page 3:
1. Select one condition from each of the operating
parameters that best describes your application.
2. Enter the corresponding performance multiplier
value in the application column.
3. Multiply all values together.
4. Obtain the maximum range from the table below
that corresponds to your switch or transmitter
model.
5. Multiply step 3 by step 4; this yields a value that
is the maximum allowable measurement range
for this application.
Example:
The vessel is a closed-top tank, uninsulated, 22 feet tall.
Surface agitation: Expect slight agitation from fill line.
Performance multiplier 0.9
Vapor and steam: The process temperature is +130° F;
slight vapor is expected.
Performance multiplier 0.9
Beam interference: No interference exists.
Performance multiplier 1.0
Sensor alignment: The sensor will be perpendicular to
the liquid surface.
Performance multiplier 1.0
Foam:
Dust:
None. Performance multiplier 1.0
None. Performance multiplier 1.0
Air movement:
Ambient temp.:
None. Performance multiplier 1.0
0 to +120° F. Performance multiplier 1.0
Pressure:
Atmospheric pressure.
Performance multiplier 1.0
Will the Model 300 work for this application?
Calculation:
Multiplied values of all application columns:
0.9 x 0.9 x 1.0 x 1.0 x 1.0 x 1.0 x 1.0 x 1.0 x 1.0 x
30 feet (maximum) = 24.3 feet
The calculation yields 24.3 feet as the new maximum range.
Since the tank is 22 feet tall, this application will give satis-
factory results.
NOTE: The performance estimates provided are conserva-
tive estimates. Since these factors are subjective,
the estimates have been designed to provide very
high confidence of system success. Contact the
factory if there are any questions concerning the
interpretation of any of these values.
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