Intended Use
VA 500 Bi-directional English 1.24 Seite 5 von 56
1 Intended use
The VA 500 consumption sensor for bi-directional measurements is used for continuous flow
measurement in both directions.
The VA 500 consumption sensor for bi-directional measurements 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 500 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.
The integrated flow direction recognition allows the bi-directional flow measurement with display of the
flow values. The flow direction is indicated by arrows in blue and green.
A meter reading is available for each flow direction, displayed in the colours blue and green according
to flow direction.
2 Instruments description
The VA 500 is a compact consumption counter for compressed air and gases.
Special features:
• Optimum accuracy due to compact design
• Intgrated Display showing Flow, consuption, velocity and temperature for two
directions
• Input inner tube diameter via display keys
• Units free selectable. m³/h, m³/min, l/min, l/s, kg/h, kg/min, kg/s, cfm
• Modbus RTU (RS485) Interface, Ethernet( also PoE) and MBus optional
• 2x Analogoutput 4..20mA
• 2x Pulse output galv. isolated.
CS Instruments Service Software
• Analogaoutput 4...20 mA scaleabler
• Selection of gas type (Air, Nitrogen, Argon, Nitrous oxide, CO2, Oxygen, Natural gas)
• Read out Service data
• Sensordiagnoses
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