Vega VEGAFLEX 83 Modbus and Levelmaster protocol PFA in Uživatelský manuál stáhnout pdf (Strana 70)

11 Supplement

VEGAFLEX 83 • Modbus and Levelmaster protocol

41838-EN-130314

2 mm

(0.079

-2mm

(-0.079

15mm

(0.591

)

-15mm

(-0.591")

0,35 m

(13.78")

0,2 m

(7.874")

0,2 m

(7.874

0,05 m

(1.969

1 1

Fig.38:DeviationVEGAFLEX83incableversion(coated)inoil

1 Dead band - no measurement possible in this area

L Probe length

Repeatability ≤ ±1 mm

Variablesinuencingmeasurementaccuracy

Temperature drift - Digital output ±3 mm/10 K relating to the max. measuring range or

max. 10 mm (0.394 in)

Additional deviation through electromag-

netic interference acc. to EN 61326

< ±10 mm (< ±0.394 in)

Inuenceofthesuperimposedgasandpressuretotheaccuracy

The propagation speed of the radar impulses in gas or vapour above the medium is reduced by

high pressure. This eect depends on the superimposed gas or vapour and is especially large at

low temperatures.

The following table shows the resulting deviation for some typical gases and vapours. The specied

values refer to the distance. Positive values mean that the measured distance is too large, negative

values that the measured distance is too small.

Gas phase Temperature Pressure

1 bar (14.5 psig) 10 bar (145 psig) 50 bar (725 psig)

Air 20 °C/68 °F 0.00 % 0.22 % 1.2 %

200 °C/392 °F -0.01 % 0.13 % 0.74 %

400 °C/752 °F -0.02 % 0.08 % 0.52 %

Hydrogen 20 °C/68 °F -0.01 % 0.10 % 0.61 %

200 °C/392 °F -0.02 % 0.05 % 0.37 %

400 °C/752 °F -0.02 % 0.03 % 0.25 %

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 95 96

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