VEGA VEGASON 64 Foundation Fieldbus User Manual

Page 49

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Input variable

Measured value

-

Version A

distance between lower edge of the flange and
product surface

-

version B, C and D

distance between lower edge of the transducer and
product surface

Measuring range

-

Liquids

up to 25 m (82.02 ft)

-

Bulk solids

up to 15 m (49.21 ft)

Dead band

1 m (3.3 ft)

Reference conditions to measuring accuracy (similar to DIN EN 60770-1)

Reference conditions according to DIN EN 61298-1

-

Temperature

+18

… +30 °C (+64 … +86 °F)

-

Relative humidity

45 … 75 %

-

Air pressure

860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)

Other reference conditions

-

Reflector

ideal reflector, e.g. metal plate 2 x 2 m (6.56 x 6.56 ft)

-

False reflections

Biggest false echo, 20 dB smaller than the useful
echo

Measuring characteristics

Ultrasonic frequency

30 kHz

Interval

> 2

s (dependent on the parameter adjustment)

Beam angle at 3 dB

Adjustment time

6)

> 3

s (dependent on the parameter adjustment)

Measuring accuracy

Resolution, general

> 1

mm (0.039 in)

Deviation

7)

see diagram

6)

Time to output the correct level (with max. 10 % deviation) after a sudden
level change.

7)

Incl. non-linearity, hysteresis and non-repeatability.

VEGASON

64 • Foundation Fieldbus

49

10 Supplement

28793

-

EN

-081127

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