SU1372204A2 - Pressure transducer - Google Patents

Abstract

Invention m. used to measure pressures at high temperatures. The purpose of the invention is to increase. pressure measurement accuracy. Under the influence of the measured pressure, the sensing membrane 2 bends and, through the force-transmitting rod 3, transmits the force to the measuring membrane 4, on which the main measuring tensometer 5 is located, at the output of which the main analog signal appears. Each of the pairs of thermistors of the additional thermal bridge 6 provides information on the average integral temperature values on the housing I and the rod 3. 2 Il.

Description

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The invention relates to a measurement technique, can be used to measure pressures at high temperatures and is an improvement of the invention according to the authors. St. No. 943543,

The aim of the invention is to improve the accuracy of pressure measurements under conditions of rapidly high temperatures.

Fig. 1 shows the design of a strain gauge pressure sensor for high temperature media; 2 shows the connection diagrams of thermistors,

The sensor includes a housing 1, a receiving membrane 2, a power-transmitting rod 3, a measuring membrane 4 with the main strainer circuit 5 applied to it, an additional thermal bridge 6, a lid 7 in which an air-tight vacuumized cavity 8 is made, to the inside surface of which a finely welded mesh 9 , and placed coolant 10,

Each of the pairs of thermistors of the additional bridge 6 provides information on the average integral temperature values on the housing 1 and on the rod 3 Therefore, the thermistors Bc and RI (Fig. 2) located on both diaphragms must be in the immediate vicinity of the rod, and the other two thermistor Cc, and (figure 2) - at the levels of both membranes on the inner surface of the housing.

The pressure sensor works in the following way.

Under the influence of the measured pressure, the sensing membrane 2 bends and, through the force-transmitting rod, transmits the force to the measuring membrane 4, on which the main measuring tensochemical circuit is located (R1, R2, R3, R4, fig 2). the main analog signal appears.

The advantage of the proposed sensor design is to reduce the additive temperature error during fast-varying thermal processes by about 10 times and, as a consequence, to increase the measurement accuracy.

Claims (1)

Invention Formula A pressure sensor according to aut., No. 943543, characterized in that, in order to improve measurement accuracy under conditions of rapidly changing high temperatures, four thermistors are inserted into it, one on each membrane on the side of the rod in the zone of its incorporation and one on the inner surface of the housing in the sealing zone of the membrane, and thermistors are included in the bridge circuit. VNIIPI Order 475/35 Circulation 847 Random polygons pr-tie, Uzhgorod, st. Project, 4 Subscription