300-R010-45G Datasheet, PDF (3/36 Pages) Magnetrol International, Inc. – Echotel® Model 300/301 Ultrasonic Non-Contact Transmitter For Level/Volume/Open Channel Flow

MEASUREMENT RANGE CALCULATIONS
MEASUREMENT RANGE PARAMETERS
HOW TO CALCULATE
Ultrasonic non-contact devices are typically rated for a
maximum range in ideal conditions. Experience has shown
that maximum range must be reduced for certain factors.
Although the maximum range rating is somewhat conser-
vative, each application must be evaluated for specific
conditions.
The operating parameters listed below can impact the max-
imum range of measurement:
To estimate how successful a particular application may be,
using the chart on page 4:
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 of the selected values together.
• Surface agitation
• Vapors and steam (as measured by temperature
difference between liquid and air)
• Beam spread interference
• Transducer alignment
• Foam
• Dust
• Air movement
• Ambient temperature
• Pressure
4. Multiply step 3 by 30' (maximum potential range);
this yields a value that is the maximum allowable
measurement range for this application.
Example:
The vessel is a closed-top tank, noninsulated, 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
Transducer alignment: The transducer will be perpendi-
cular to the liquid surface.
Performance multiplier 1.0.
Foam:
None.
Performance multiplier 1.0.
Dust:
None. Performance multiplier 1.0.
Air movement:
None. Performance multiplier 1.0.
Beam spread
interference
Ambient temperature: 0 to +120° F.
Performance multiplier 1.0.
Air movement
Beam spread
interference
Pressure:
Atmospheric pressure.
Performance multiplier 1.0.
Will the Model 300/301 work for this application?
Vapors
Surface
agitation
Dust
Foam
Calculation:
Multiply all values in the application column:
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 multipliers provided are conser-
vative estimates. Since these factors are subjective, the
values 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 per-
formance multipliers.
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