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High pressure transducers with diaphragms built for hydraulic pressure testing15th July 2007 Hydraulic pressure test stands can be extremely unforgiving to some pressure transducers especially in high dynamic systems which are testing hydraulic actuators or valves.The constant opening and closing of hydraulic valves can create large surges in pressure sending shockwaves through the system. If the most appropriate pressure sensing technology is not employed this can lead to irreparable damage to the sensing element. One method to protect a high pressure transducer in a hydraulic system is to fit a snubber or a restriction inside the pressure connection. A snubber is very effective in absorbing high frequency shock pressures, but there is a trade off with the dynamic response and over time the snubber or restriction could become blocked from a build up of contaminant particles. Another method to reduce the effect of hydraulic pressure spikes is to use a much higher range pressure transducer than you need so that its over-pressure rating is effectively increased. But this again leads to compromise in measurement performance which in this case is a combination of accuracy, signal to noise and lower output signal. In some hydraulic systems it maybe appropriate to combine both of the above methods to protect a pressure transducer but it is also worth carefully choosing the pressure sensing technology that is most suited to the punishing changes in pressure it will be subjected to as part of a high pressure test stand. The TPSA and TPS high pressure transducer both have sensing elements that are machined from one piece of 17-4ph Stainless Steel which results in a uniform structural lattice for higher mechanical integrity without the need for composite high precision welding. The sensing element is TIG welded to a specially designed pressure connector which isolates the sensing element from external mechanical stresses such as the ones induced when installing a pressure transducer. The sensing diaphragm of the TPSA and TPS hydraulic pressure transducers is typically 0.8-1.0mm thick which makes the diaphragm very strong and durable. A Wheatstone bridge arrangement of foil strain gauges are bonded to the reverse side of the diaphragm which are then connected to a signal conditioning PCB for rationalising the pressure transducers output. The TPSA high pressure transducer has a 4-20mA current loop, 5 or 10 volt output with pressure ranges from 0 to 50 bar (750 psi) up to 0 to 1000 bar (15,000 psi) and achieves a typical measurement accuracy of 0.1% full scale best straight line The TPS high pressure transducer has a milli-volt output signal with pressure ranges from 0 to 10 bar (150 psi) up to 0 to 1000 bar (15,000 psi) and achieves a measurement accuracy of 0.15%FS BSL typically. Both the TPS and TPSA high pressure transducer can be configured for most applications with a selection of electrical connections such as a DIN 43650 plug, M12 connector, Amphenol military bayonet style plug, Binder connector and integral cable gland. A complete choice of pressure connections are also available with G1/4 male or female, 1/8 or 1/4 NPT male or female, G1/2A male, M12 or M14 x 1.5 male and 7/16-20 UNF male or female. Related Products TPSA product page for pdf data sheets and pricing TPS product page for quote requests and more technical info High range pressure sensors and instruments Associated Topics Pressure transducer for hydraulic material testing applications High over-load differential pressure measurement with twin sensors Causes of failure for high pressure transducers High frequency pressure measurement How to protect pressure sneosrs from pressure spikes Design concepts for protecting sensors from over-pressure Resources Explanations for pressure transducer parameters Calculating pressure values in different uniits
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