Vega VEGAPULS 66 (≥ 2.0.0 - ≥ 4.0.0) standpipe ver. Mod Bedienungsanleitung PDF herunterladen (Seite 37)

9 Diagnosis, Asset Management and service

VEGAPULS 66 standpipe version • Modbus and Levelmaster protocol

41367-EN-121011

The below tables show typical examples of application-relevant meas-

urement errors with standpipe versions. The measurement errors are

dierentiated according to:

•

Constant level

•

Filling

•

Emptying

The images in column "Errorpattern" show the real level with a bro-

ken line and the level displayed by the sensor as a continuous line.

Level

time

Fig.16:Thebrokenline1showsthereallevel,thecontinuousline2showsthe

level displayed by the sensor

Instructions:

•

Wherever the sensor displays a constant value, the reason could

also be the fault setting of the current output to "Hold value"

•

In case of a too low level indication, the reason could be a line

resistance that is too high

9.4 Measurement error with constant level

Fault description Error pattern Cause Rectication

1. Measured value

shows a too low or too

high level

Level

time

– Min./max. adjustment not

correct

– Adapt min./max. adjustment

– Wrong linearization curve – Adapt linearization curve

– Installation in a bypass tube or

standpipe, hence running time

error (small measurement error

close to 100 %/large error close

to 0 %)

– Check parameter "Application"

with respect to vessel form,

adapt if necessary (bypass,

standpipe, diameter)

2. Measured value

jumps towards 100 %

Level

time

– Due to the process, the ampli-

tude of the product echo sinks

– A false signal suppression was

not carried out

– Carry out false signal suppres-

sion

– Amplitude or position of a

false echo has changed (e.g.

condensation, buildup); false

signal suppression no longer

matches

– Determine the reason for the

changed false echo, carry out

false signal suppression, e.g.

with condensation

Treatment of measure-

ment errors with stand-

pipe versions

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 67 68

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