Determining the surface velocity
The "VEL‑R‑5 " sensor module is supported by the Jellox Analog . It a uses pulsed, coherent radar technonlogy operating in the millimetre wave range to determine the surface velocity, thereby enabling contactless measurement. The following figure shows the installation situation for this type of sensor module.
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Installation situation of the VEL‑R‑5 (upstream, recommended) |
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The module chain described in the following is started every 10 sec. (i.e. with the measurement interval) and executed once. The first three stages ("raw", "Mounting angle" and "Direction") are already completed in the sensor module. I.e. the measurement level delivered by the sensor module is already the actual surface velocity (mounting angle and direction of flow considered). The measurement interval is independent from the record interval and cannot be altered. It is used to monitor the conditions under which a "Smart Action" is triggered. It is then the currently valid measurement value generated in the measurement interval that is recorded. The measurements executed since the last recording are not consolidated (e.g. average determination). The interval for the recordings can be selected via the "Record interval" parameter (see Device settings ). The "Smart Actions" can, however, be used to switch to an alternative record interval (see Edit Smart Action).
Schematic diagram of how the measurement value for the "Remote measurement channel" is generated
| 1 | Determining the raw value (see Determining the raw value) | 4 | Monitoring of the conditions under which a "Smart Action" is triggered (see Smart Action module) |
| 2 | Calculates the surface velocity taking the configurable "mounting angle" into account (see Taking the mounting angle into consideration) | 5 | As the record interval can be selected differently from the non-changable measurement interval, the measurement values are not recorded every time a measurement takes place. (see Record module) |
| 3 | Corrects the sign of the surface velocity value taking the configurable "Direction" into account (see Taking the flow direction into consideration) | 6 | This part of the module chain is already completed in the sensor module. |
