VEGA VEGAFLEX series 60 Recurring function test - Manual (Page 12)

Example
During setup, the level echo had 32 dB. The distance [m] to the
medium was 12.5 m.
The actual level echo has 25 dB. The distance [m] to the medium is
16.1 m.
Calculation of the difference of the two distance values: 16.1 m -
12.5 m = 3.6 m
Rounding off the calculated difference: 3.6 --> 3
Multiplying the difference with the factor (0.5): 3 * 0.5 = 1.5
Because the distance of the actual level is larger than the distance
during setup, this value will be added to the amplitude of the actual
level value:
25 dB + 1.5 = 26.5 dB
The result of the example (26.5 dB) is thus within the permissible
tolerance range of - 6 dB (32 dB - 6 dB = 26 dB)
In this example, the test point would be successfully fulfilled.
If all the above conditions are fulfilled, the measurement works
correctly and the verification of the echo data was successful.
Continue with the next test point.
3 .5 Sensor reaction to a level change
With this test point, you monitor the reaction of the sensor during a
level change.
1 Set the indication of the sensor DTM to "Distance".
2 Change the filling of your vessel.
It doesn't matter if you fill or empty the vessel.
The filling speed is also not relevant.
The level change must be at least 50 mm.
3 Take note of the sensor reaction.
Does the measured value [m(d)] move in the correct direction
during emptying/filling?
The displayed measured value (distance) is the distance between
seal surface of the sensor and the product surface.
● The measured value will decrease during filling.
● The measured value will increase during emptying.
When the level value changes analogue to the level change, the
measurement works correctly and the assessment of the sensor
reaction was successful.
12 Recurring function test • for VEGAFLEX series 60
3 Sequence of the recurring function test
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