The accuracy of the instrument depends strongly on the installation situation or the flow profile at the installation site (see leaflet DWA M 264 Edition 2015). If there is not sufficient straight inlet and outlet pipe run or if the flow is disturbed due to pipe fittings, valves etc. at the inlet area, the sensor can also be placed directly in front of the control valve. Depending on the design of the valve and the required accuracy of the measurement, a signal correction based on the current opening position is may be required (simultaneous flow profile correction). This can be done either directly in the sensor head (types AL100/ SS100) or in the separate evaluation electronics VACOMASS® flexcontrol.
The following types of devices are available:
VACOMASS® flow meter SS
The electronics is located in a compact, pressure-resistant stainless steel housing (material 1.4571) with a separate terminal compartment.Optionally an integrated display is available.
VACOMASS® flow meter AL
The electronics is placed in the standard aluminum housing. Optionally an integrated display is available.
VACOMASS® flow meter AL DIN
The electronics ist placed in a compact aluminum housing without display.
VACOMASS® flow meter AL 100
The electronics is placed in a special aluminum housing with an optional display. The instrument has an analogue input for reading in the position feedback of the control valve. Reading is corrected by current stroke to achieve a precise air flow measurement..
VACOMASS® flow meter multi
In big pipelines, it can make sense to place several sensors individually in different insertion depths. A weighted average over different signals from several sensors in the case of irregular flow profile can be calculated in order to be able to measure the air volume correctly. All sensor types (SS, AL or AL DIN) can be used. The evaluation of the measuring signals takes place via the electronics VACOMASS® flexcontrol multi.
In addition, a hot-tapping unit with ball valve to be mounted in the existing pipeline can be supplied. There are two versions available:
Hot tapping unit with manually operated ball valve with flexible insertion depth
Hot tapping unit with manually operated ball valve and fixed insertion depth and fixed sensor orientation