Burkert Flowave 8098, Operating Instructions Manual

Page: 259 / 354

259
SAW sensor – Maintenance
Type 8098 FLOWave L
17.3.5 Checking the correct operation of the sensor
You can check the correct operation of the sensor by comparing the current measured values of some
parameters with their reference values. The reference values depend on the conditions of your process:
•
If you measure water at 23 °C ±5 °C (73.4 °F ±9 °F) that is free of gas bubbles and free of solids, then
the conditions of your process are similar to the calibration conditions of the device at the manufacturer.
The reference values are those after the device calibration and they can be read in the menu Device
verification .
• If you do not measure water at 23 °C ±5 °C (73.4 °F ±9 °F), then the reference values are in the report that
you have generated with the Bürkert Communicator software at the following moments:
− after the first commissioning of the device. Refer to chapter 9.
− after the last maintenance operation
To check the correct operation of the sensor, do the following:
1. If you do not measure water at 23 °C ±5 °C (73.4 °F ±9 °F), then get the report with the reference values.
2. Access the menu Device verification :
→
Go to the
CONFIGURATION
view.
→
SAW sensor
→
Confirm to access the Parameter view.
→
Go to the MAINTENANCE view.
→
Device verification
.
The values of the parameters are displayed.
3. Calculate the deviation for each parameter that is listed in Table 35 or in Table 36 . Use the following
formula:
| current measured value – reference value | / reference value = deviation
• If you measure water at 23 °C ±5 °C (73.4 °F ±9 °F) that is free of gas bubbles and free of solids, then use
the values that are displayed in the parameters from columns A and B of Table 35 .
Table 35: Parameter values to compare if the measured liquid is water at 23 °C ±5 °C (73.4 °F ±9 °F)
Menu item A B
Current measured value of the
parameter
Reference value of the
parameter after calibration at the
manufacturer
DF DF DF fact. cal.
Acoustic transmission factor Acoustic transmission factor Acoustic transmission factor
fact. cal.
Amplitudes SAW signal SAW signal fact. calibration
Signal WG1 13 Signal WG1 13 fact. calibration
Times of flight A0 A0 fact. calibration
WG1 WG1 fact. calibration
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