Commissioning Radar Tank Gauge Dip table

Commissioning

Radar Tank Gauge

Dip table

The dip table is used to correct the level readings of the 7500 RTG using independently taken hand dips. The dip table is used in particular to adapt the level gauge to the specific application conditions as mechanical offset and tank/stilling well design. Depending on national regulations, national inspectors will dip the tank at one to three levels during a calibration run and check the level readings.

Only one value pair must be entered into the dip table to correct the measurement

offset.

If a second value pair is entered into the dip table, the 7500 RTG accepts the corrected measured values identically for both value pairs. All other measured values are determined by linear extrapolation.

If you enter more than two value pairs, the system carries out a linear interpolation between adjacent value pairs. Outside these value pairs, extrapolation is also linear.

basic setup

history reset

dip table

alternatives

preferred choice:

hand dip and

immediate

offset correction in

semi-automatic mode

collect further hand dip data; if deviation from measurements

>4 mm and level change > 2 m: enter a new dip value into dip table using the semi-automaticmode

collect hand dip and

measurement data over full measurement range

evaluate collected data; enter characteristic value pairs into the dip table using the manual mode

L00-FMR53xxx-19-00-00-en-014

Figure 8: Alternative procedures to fill the dip table.

To collect and enter data into the dip table, two alternative procedures may be carried out. In order not to mix up measurement values corrected by the offset or linearization of the dip table with uncorrected measurement values, it is recommended to use the semi-automatic mode of the dip table to enter new data pairs. In this case, the first dip value should be entered immediately after the basic calibration. Further linearization points should be entered only after a level change of at least 2 m (see Figure 8:, preferred choice) and a deviation between the "uncorrected measurement value" and the hand dip value of at least 4mm.

If this procedure can not be followed, then NO value pair should be entered into the dip table after basic calibration. Measurement data and hand dip values should be collected over the full measurement range and be evaluated with regard to a good linear fit. Only then characteristic value pairs should be entered into the dip table using the "manual mode" (see Figure 8:, right side). If further linearization is needed, further hand dip values should be entered using only the "semi-automatic mode".

Note!

The offset should NOT be determined and entered within the close range of the antenna (conf. definition of the safety distance) or immediately in the range of the tank bottom, because within these ranges interferences of the radar signal may occur.

60	Installation and Operations Manual

7532 specifications

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