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

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:

None. Performance multiplier 1.0

Dust:

None. Performance multiplier 1.0

Air movement:

None. Performance multiplier 1.0

Ambient temp.:

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.

Sensor alignment

Temperature

Pressure

Beam spread

interference

Beam spread

interference

Air movement

Dust

Vapors

Foam

Surface

agitation

6

MEASUREMENT

RANGE

CALCULATIONS