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APG IRU-3000 user manual User Manual

Page 14

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IRU-2xx4/3xx4

Rev. A2, 11/08

14

Automation Products Group, Inc.

APG...Providing tailored solutions for measurement applications

Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • [email protected]

CALIBRATION

Calibration The IRU-2XX4/3XX4 must be calibrated if a familiar reading is
desired. The software is designed so that a calibration factor of 1000 will yield
units that represent inches, feet and meters. Variations of the speed of sound in
different atmospheres may yield readings which slightly differ from actual
measured values. If this is unacceptable, vary the Calibration factor to “dial in”
the exact number desired.

Acceptable values for this parameter range from 0100 to 1999

If a certain distance to a target is known and the sensor is not outputting the
desired reading, use the following formula to obtain the desired reading.

New Calibration Factor = (Desired Distance Reading x Old Calibration Factor) /
Sensor Distance Reading.

Example: Suppose a target is 5.50 feet from the face of the sensor. The sensor
has a calibration factor of 1000 and is yields a Distance Reading of 5.65 ft.

Calculate the new Calibration Factor by:
New Calibration Factor = (5.50 x 1000) / 5.65 = 0973.

To read the calibration factor in a sensor, use the command structure:

Send

Receive

AAh

Start Byte

66h

Start Byte

01h,

Sensor Number

01h

Sensor Number

0Bh

Command

0Bh

Command

00h

Data (not used)

03h

Calibration (High Byte)

00h

Data (not used)

E8h

Calibration (Low Byte)

55h

End Byte

##h

NA

99h

Stop Byte

To change the calibration factor in a sensor, use the command structure;

Send
AAh

Start Byte

01h,

Sensor Number

0Ch

Command

03h

Data (not used)

0973 D = 3CD

CDh

Data (not used)

55h

End Byte

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