In order to allow for simultaneous flow profile correction, mostly the VACOMASS® air supply and distribution systems are calibrated as a compact unit of control valve and flow meter. On the test stands of our CAMASS® Calibration Centre, the impact of varying valve positions on the raw signal of the thermal flow sensor will be determined precisely during that calibration.
In contrast to liquid media, the properties of flowing gases are far more dependent upon the operating conditions, the gas composition and the actual flow ratios in the pipeline. If these parameters are not taken into account, the measuring results will be considerably limited.
In simulating exactly the field installation situation during the calibration process in our CAMASS® Calibration Lab, also the influence of the piping layout on the flow rate measurement due to flow profile distortions may be compensated.
There are 5 types of calibration
1. Calibration of the VACOMASS® flow meter under actual operating conditions in our CAMASS®
Calibration Lab. This standard calibration will be done under the assumption that sufficient inlet and
outlet straight pipe runs are available for installation of the VACOMASS®flow meter. Process
parameters like temperature, pressure, installation details of piping and gas composition will be
considered to achieve a high accuracy of flow metering.
2. Calibration of a VACOMASS® configuration as a complete unit (VACOMASS® control valve plus
VACOMASS® flow meter). This calibration includes in addition the flow profile correction depending
on the opening of the VACOMASS® control valve. Correction can be done in a master, slave or
basic module.
3. Calibration of a VACOMASS® configuration as a complete unit (VACOMASS® control valve plus
VACOMASS® flow meter) including simulation of the actual piping isometry (scale 1:1). This
calibration includes in addition the flow profile correction depending on the opening of the
VACOMASS® control valve.
4. If there is not sufficient straight inlet and outlet piping available, if installation must be done behind a
blower or compressor, which will produce flow pulsations, calibration of the VACOMASS® flow
meter will be done in combination with the VACOMASS® flow conditioner as a complete unit.
5. Calibration takes place in comparison with master calibration devices (and according to contractual
requirements) on an DAkkS (German Accredited Institute) Calibration Lab using measuring
equipment, which is regularly and traceable recalibrated by the PTB (Physikalisch Technische
Bundesanstalt).