It is suitable for measuring the pressure of liquids, vapors and gases that are not corrosive to steel and copper alloys. Because a sliding wire resistance transmitter is set inside the resistance remote pressure gauge, the measured value can be transmitted to the secondary instrument far away from the measurement in the form of electricity, so as to realize centralized detection and long-distance control. In addition, the pressure gauge can indicate the pressure on the spot, which is convenient for on-site work inspection.
The resistance remote pressure gauge consists of a spring tube pressure gauge and a sliding wire resistance transmitter. The mechanical part of the resistance remote pressure gauge
The function is the same as the general spring tube pressure gauge. Since the resistance transmitter system is set on the gear transmission mechanism, when the gear transmission mechanism is
When the sector gear shaft of the
The change of the measured pressure value is transformed into the change of the resistance value, which is transmitted to the secondary instrument to indicate a corresponding reading value. At the same time, once
The gauge also indicates the corresponding pressure value.
Remote pressure gauges include digital remote pressure gauges, electrical contact remote pressure gauges, resistance remote pressure gauges, differential remote pressure gauges, and shock-resistant resistance remote pressure gauges.
The remote pressure gauge is suitable for measuring the pressure of liquid, steam and gas and other media that are not corrosive to steel and copper alloys. A sliding wire resistance transmitter is set inside the instrument, which can transmit the measured value to the secondary instrument far away from the measuring point in the form of electric quantity, so as to realize centralized detection and remote control. Process inspection. The instrument consists of a spring tube pressure gauge and a sliding wire resistance transmitter.
The working principle of the mechanical part of the remote pressure gauge is the same as that of the general spring tube pressure gauge. Since the resistance transmitter is arranged on the gear transmission mechanism, when the sector gear shaft in the gear transmission mechanism is deflected, the rotating arm (brush) of the resistance transmitter is correspondingly deflected, because the brush slides on the resistor , so that the change of the measured pressure value is transformed into the change of the resistance value, and transmitted to the secondary instrument, indicating a corresponding reading value. At the same time, the primary instrument also indicates the corresponding pressure value.
The two pressures of the measured medium of the pressure transmitter are passed into the high and low pressure chambers, acting on the isolation diaphragms on both sides of the delta element (ie the sensitive element), and transmitted to the measuring membrane through the isolation diaphragm and the filling liquid in the element slice on both sides. The measuring diaphragm and the electrodes on both sides of the insulating sheet each form a capacitor, and the output 4-20mA standard signal is sent to the program control system.
The performance of general-purpose EMFs on the market is quite different. Some have high precision and many functions, and some have low precision and simple functions. The basic error of the instrument with high precision is (±0.5[%]～±1[%])R, and the instrument with low precision is (±1.5[%]～±2.5[%])FS, and the price difference between the two is 1～2 times. Therefore, it is not economical to use high-precision instruments in places where the measurement accuracy is not very high (for example, non-trade accounting is only for control purposes, and only requires high reliability and excellent repeatability).
