Dry calibration

Dry calibration is used when hydraulic calibration e.g. is not possible due to the lack of a suitable measuring shaft or a lack of storage space.

If hydraulic calibration is not possible, the technical information on throttle calibration, Part 1: Hydraulic calibration of throttle devices No. 5.6, can be used to check the actuating movement in accordance with the SüwVO Abw. and RdErl.

Proper hydraulic calibration of the throttle device takes into account the operating conditions at the installation site.

The following partial services are included:

Preparatory work
Optical and technical inspection
Metrological check including evaluation
Presentation of results / test report

Preparatory work

As part of the preparatory work, the documents required for the investigation, such as existing plans, maps and drafts compiled and evaluated. The necessary examination program will also be developed.

Optical and technical inspection

As part of the optical check, an assessment is made if the throttle device complies with the recognized rules of technology. On the one hand, the local conditions are measured – if necessary – in order to be able to check all dimensions relevant to measurement. On the other hand, there is an optical assessment of the flow conditions in the area of the throttle device. This primarily includes the inflow and outflow conditions. It is also assessed to what extent deposits influence the flow measurements or the flow control device. In addition to the above an assessment of the structural condition is carried out.

Metrological check including evaluation

Simulation of the upper water level with simultaneous control of the control movement of the throttle body (opening height). The measured values are compared with the target delivery quantity of the throttle device to be checked and any deviations are determined.

Presentation of results / test report

The test report is created based on all test results determined under points 1 – 3. If the facilities do not work properly, advice on troubleshooting is given. In addition, the test certificate required in accordance with SüwVO Abw is issued

Cooperation of the client

Auxiliary personnel for preparation and post-processing purposes (e.g. opening the throttle shaft) must be provided on site. Coordinations to enable and carry out the check (e.g. possibly necessary measures to ensure accessibility and safeguarding the location) must be organized on site.

Any readjustment of the throttle device is carried out by a BIOGEST® service technician.