The Fluidistor gas flow meter GD 300 Ex / GD 500 Ex is used for gas volume measurements and for technical and medical gases.
The flow meters work on the principle of “fluidistor oscillator”. The measuring principle is dense independent and has no moving parts, thus there are no wearing parts in place and a recalibration is not necessary.
The Fluidistor gas flow meters are available from DN 15 – DN 400.
Nominal size:
DN 25 to DN 300
Process connection:
Wafer / sandwich / intermediate flange
Installation lenght: 65 mm
Nominal size:
DN 40 to DN 400
Prozessanschluss:
flange acc. to DIN EN-1092-2 or
DIN 2576, flange acc. to ASME B 16.5
Installation lenght:
depending on nominal size (300 – 500 mm)
Nominal size:
DN 15, DN 25
Process connection:
external pipe thread
R 1/2”
G 1”
Installation lenght: 300 mm
With us you stay independent!
With the Fluidistor GD 300 Ex / GD 500 Ex you are completely independent concerning repair & maintenance.
The oscillating measuring method according to the Fluidistor principle requires no moving parts and no sensitive sensor materials, therefore an almost maintenance-free operation of the GD 300 Ex / GD 500 Ex is possible.
The integrated platinum wire sensor can be replaced without removing the gas flowmeter from the pipe system. A sensor change does not affect the calibration of the flow meter.
Recalibrations at regular intervals are not required and the cleaning of the flowmeter can be made directly on site. You can check the functionality of the sensors independently and gain independence from external resources.
You do not have to order a service technician to come onsite or to remove the flow meter and send it in.
The diagram applies to gases with a density of air at NTP (0°C and 1013 mbar). The decrease of pressure is always proportional to the gas density. If e.g. the operating pressure rises by 100% the pressure drop doubles.
The diagram applies to gases with a density of air at NTP (0°C and 1013 mbar). The decrease of pressure is always proportional to the gas density. If e.g. the operating pressure rises by 100% the pressure drop doubles.
The flow meter GD 300 Ex / GD 500 Ex operates according to the principle of a „Fluidistor oscillator“. The gas passes the Fluidistor measuring head either directly or via an orifice in the main pipe.
The gas is discharged through the orifice into the Fluidistor measuring chamber. Directly behind the inlet there is a triangular damming body, which, due to the unstable middle position, forces the gas either to flow past on the right or left. At the level of the damming body in the right and left wall of the Fluidistor measuring chamber are two openings which are connected to each other by a channel. If the gas flows to the left from the damming body, a negative pressure is created on the left side wall or at the opening of the connecting channel.
This negative pressure is balanced through the right opening of the connecting channel. The pressure equalization of the negative pressure causes a change of flow direction from the left to the right side. The entire process is then repeated on the right side.
The period of time required for pressure equalization corresponds to a special amount of gas (litre/pulse), which has passed through the GD 300/GD 500. The frequency of the pressure equalization is proportional to the flow velocity.
The changing flow through the connecting channel is detected by a platinum wire (diameter 15 μ) in the connecting channel. A constant voltage is applied to the wire, which is permanently monitored. At the moment when the pressure equalization occurs in the connecting channel, the wire is not circulated around by gas for a short time and heats up due to the current flowing through the wire. This causes a temporary rise of the resistance in the platinum wire (like a Pt100 sensor) and the voltage drop (V=R*I) increases.
This increase in voltage is detected by the integrated calculator HB 300 Ex. Using the current output the measured value is directly transferred to a superior PLC system. Using the pulse output the signal is transferred to the external Flow Computer GDR 1501.
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