Instruments decription
VA 525 EN V1.01
Page 5 of 41
1 Intended use
The VA 525 consumption sensor is used for continuous flow measurements.
The VA 525 consumption sensor is designed and constructed exclusively for the intended purpose
described here and may only be used accordingly.
The user must check whether the instrument is suitable for the selected application. It must be
ensured that the medium is compatible with the wetted parts. The technical data listed in the data
sheet are binding.
Improper handling or operation outside the technical specifications is not permitted. Claims of any
kind based on improper use are excluded.
Operating principle:
The VA 525 consumption probe operates according to the calorimetric measuring method.
The basis of this measuring method is the electrical heating of the mechanically protected built-in
sensor. The mass flow, the volume flow and the flow velocity can be measured and determined by
the resulting heat flow to the passing medium (gas).
With the calorimetric measurement method (based on the measurement principle), the operating
temperature and pressure of the medium have no influence on the measurement result, only the
material data of the gas component are decisive.
2
Safety instructions
Please read carefully before starting the device!
Warning: Do not exceed the pressure range of 16 bar!
Observe the measuring range of the sensor!
Always observe the direction of flow when positioning the sensor!
The screwed fixture must be pressure tight.
It is absolutely necessary to avoid condensation on the sensor element or water drops in the
measuring air as they may cause faulty measuring results.
The manufacturer cannot be held liable for any damage which occurs as a result of non-
observance or non-compliance with these instructions. Should the device be tampered with
in any manner other than a procedure which is described and specified in the manual, the
warranty is cancelled and the manufacturer is exempt from liability.
The device is destined exclusively for the described application.
We offer no guarantee for the suitability for any other purpose and are not liable for errors
which may have slipped into this operation manual. We are also not liable for consequential
damage resulting from the delivery, capability or use of this device.
We offer you to take back the instruments of the instruments family VA 525 which you would
like to dispose of.
Qualified employees from the measurement and control technology branch should only carry
out adjustments and calibrations.
