Vega VEGAFLEX 83 Modbus and Levelmaster protocol PFA in Manual de usuario descargar pdf (Pagina 62)

9 Diagnostics and service

VEGAFLEX 83 • Modbus and Levelmaster protocol

41838-EN-130314

Level

time

Fig. 25: The broken line 1 shows the real level, the continuous line 2 shows the

level displayed by the sensor

Note:

•

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

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

– Running time error (small

measurement error close to

100 %/serious error close to

0 %)

– Repeat setup

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 signal has changed (e.g.

buildup); false signal suppres-

sion no longer matches

– Determine the reason for the

changed false signals, carry out

false signal suppression, e.g.

with buildup

Measurementerrorduringlling

Fault description Error pattern Cause Rectication

3. Measured value re-

mains in the area of the

bottom during lling

Level

time

– Echo from the probe end larger

than the product echo, for

example, with products with

< 2.5 oil-based, solvents, etc.

– Check application parameter

"Medium" and "Vessel height",

adapt if necessary

4. Measured value re-

mains momentarily

unchanged during ll-

ing and then jumps to

the correct level

Level

time

– Turbulence on the product

surface, quick lling

– Check application parameters,

change if necessary, e.g. in

dosing vessel, reactor

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 95 96

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