Mounting | Radar Tank Gauge |
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3.3.2Engineering tips
Measuring conditions
•The measuring range starts at the bottom end of the stilling well.
•In case of media with a low dielectric constant (groups A and B), the pipe end can be visible through the medium at low levels. In order to guarantee the required accuracy in these cases, it is recommended to position the
•In applications with planar or parabolic antennas, especially for media with low dielectric constants (see page 15), the end of the measuring range should not be closer than 1 m (40”) to the flange.
•For overspill protection, it is possible to define a safety distance (SD) additionally to the blocking distance (BD).
•This safety distance (SD) is set to 0.5 m (20") by default and generating an alarm in case the level rises inside the safety distance.
•Distance B defined the smallest recommended measurement range.
•Depending on its consistence, foam can either absorb microwaves or reflect them off the foam surface. Measurement is possible under certain conditions.
100% A
B
C
0%
max. level
BD
SD
| reference: flange / BD | reference: antenna tip |
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| (see picture) |
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| Blocking | Safety | recommended additional settings | ||||
| distance | distance | |||||
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| BD [m / ft] | SD [m / ft] | A [mm / inch] |
| B [m / ft] |
| C [mm / inch] |
7532 RTG (planar) | 1 / 3.28 | 0.5 / 1.6 | 1000 / 40 |
| 0.5 / 1.64 |
| 150…300 / |
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| 6…12 | |||||
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Behaviour if measuring range is exceeded
The behaviour in case of the measuring range being exceeded can be freely set: the default setting is a current of 22 mA and the generation of a digital warning (E681).
14 | Installation and Operations Manual |
