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VEGA VEGAFLEX 81 Foundation Fieldbus Coax probe User Manual

Page 69

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69

11 Supplement

VEGAFLEX 81 • Foundation Fieldbus

44215-EN-130910

Ʋ Channel 9

Count rate

Transmission rate

31.25 Kbit/s

Current value

Ʋ Non-Ex and Ex ia instrument

10 mA, ±0.5 mA

Ʋ Ex-d instruments

16 mA, ±0.5 mA

Resolution, digital

> 1 mm (0.039 in)

Accuracy (according to DIN EN 60770-1)
Process reference conditions according to DIN EN 61298-1

Ʋ Temperature

+18 … +30 °C (+64 … +86 °F)

Ʋ Relative humidity

45 … 75 %

Ʋ Air pressure

+860 … +1060 mbar/+86 … +106 kPa

(+12.5 … +15.4 psig)

Installation reference conditions

Ʋ Min. distance to installations

> 500 mm (19.69 in)

Ʋ Vessel

metallic, ø 1 m (3.281 ft), centric installation, process

fitting flush with the vessel ceiling

Ʋ Medium

Water/Oil (dielectric constant ~2.0)

2)

Ʋ Installation

Probe end does not touch the vessel bottom

Sensor parameter adjustment

No gating out of false signals carried out

Typical deviation - Interface measure-

ment

± 5 mm (0.197 in)

Typical deviation - Total level interface

measurement

± 5 mm (0.197 in)

Typical deviation - Level measurement

3)4)

See following diagrams

Max. deviation - Version with reference

distance

± 10 mm (0.39 in)

Deviating upper dead band - Version with

reference distance

450 mm (17.7 in)

2)

With interface measurement = 2.0

3)

Depending on the installation conditions, there can be deviations which can be rectified with an adaptation of

the adjustment or a change of the measured value offset in the DTM service mode

4)

The dead bands can be optimizes by a false signal suppression.