147
SAW sensor - Maintenance
Type 8098
15.18
Calibrating the offset value of the acoustic
transmission factor
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Make sure the teach-in conditions are similar to those of the process.
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In order that the calibration result is correct, make sure the following conditions are met during the
teach-in procedure:
•
The liquid temperature is stable
• The liquid that flows through the device does not change. Or the liquid is still and the pipe is full and free
of bubbles.
During the calibration:
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The status indicator is orange, if the operating mode of the status indicator is set to NAMUR
(ex-works setting, see chpt.
10.4 Changing the operating mode of the status indicator or switching
).
•
The NAMUR mode "function check" is active. The outputs react depending on your settings.
Instead of calibrating the offset value of the acoustic transmission factor, you can directly set it. See
chpt.
To calibrate the offset value of the acoustic transmission factor, do the following:
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Make sure the liquid in the pipe is the liquid to be measured.
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Charge the pipe. To avoid bubbles and air in the pipe, make sure it is full of liquid.
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Select the device in the navigation area.
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SAW sensor
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Maintenance
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Calibration
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Add. meas. values
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Acoustic transmission factor
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Offset
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Teach-in by reference
The current settings are displayed.
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Start the calibration of the offset value.
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After 30 s, enter the acoustic transmission factor of the reference liquid.
The new settings are displayed.
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Finish
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The offset value of the acoustic transmission factor is calibrated.
If the calibration fails, a message is displayed. Refer to chpt.
19.9 Messages due to calibration or simulation.
English
