New design results in optimum efficiency
May 2000
Pneumatics & Hydraulics
Danfoss
The design of the new pressure transmitter from Danfoss offers a higher level of accuracy in pressure measurement while at the same time preventing damage from pressure surges or "liquid hammer". The range features very low thermal drift on zero point and span, excellent resistance to vibration and shock, EMC protection, high IP classification, acid-proof and stainless steel AISI 316L.
Pressure transmitters installed with valves or pumps are often subjected to pressure surges or "liquid hammer", damaging the transmitter or producing unreliable measurements. Danfoss has developed a range of transmitters that, regardless of the impacts, give accurate and reliable measurement without recalibration or adjustment. The piezo-resistive silicon technology used has made the transmitters capable of withstanding an excess pressure of ten to twenty times the measuring range.
The unit is fitted with a nozzle to prevent cavitation at the diaphragm. The nozzle does not protect against pressure peaks; it prevents the development of gas pockets that cause pressure peaks. In addition, the nozzle is so large that it does not increase the total time constant of the device substantially. The nozzle is so large that with normal viscosities it does not markedly increase the total time constant of the transmitter for both mechanical and electronic.
The device is suitable for all systems operating with liquid at a given flow and where the measuring point is located with a valve or a pump. It is also ideally suited for hydraulic systems with high pressure and fast actuators.
Other pressure connections and measuring ranges can be ordered, or an adapter can be used if required.
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