TILLLQUIST transmitter VU40-154 company agent

TILLLQUIST transmitter VU40-154 company agent

Transform various measured parameters (such as temperature, pressure, flow rate, and liquid level) into pressure signals ranging from 0.02 to 0.1 IMPa, in order to transmit them to unit combination instruments for indication, recording, or adjustment. Pneumatic transmitters have a relatively simple structure, reliable operation, strong resistance to environmental influences such as electromagnetic fields, radiation, temperature, humidity, etc. They can prevent fire and explosion, and are relatively inexpensive; The disadvantage is that the response speed is slow, the transmission distance is limited, and it is difficult to connect with a computer. The influence of transmitter iron core: In conventional transmitter transformation, iron core material is used as the magnetic medium. On the one hand, due to the nonlinear characteristics exhibited by ferromagnetic materials (the starting and saturation regions of magnetization lines), it is not an ideal linear transmission relationship, which will inevitably affect the accuracy of the transmitter. On the other hand, due to the hysteresis of ferromagnetic materials, the iron core also affects the accuracy of the transmitter. Generally, within the power frequency range, the hysteresis angle of conventional silicon steel sheets varies from 0 ° to 15 °, and the existence of this hysteresis angle is equivalent to increasing the reactive power component. Since conventional power transmitters calculate power by multiplying voltage and current signals, this hysteresis angle will also affect the accuracy of the power transmitter.

The function of a transmitter is to detect process parameters and transmit the measured values in a specific signal form for display and adjustment. The function of automatic detection and regulation system is to convert various process parameters such as temperature, pressure, flow rate, liquid level, composition and other physical quantities into a unified standard signal, and then transmit it to the regulator and indicator recorder for adjustment, indication and recording. The selection of transmitters is usually considered based on installation conditions, environmental conditions, instrument performance, economy, and application media. In practical application, it is divided into direct measurement and indirect measurement; Its uses include process measurement, process control, and device interlocking. Common transmitters include ordinary pressure transmitters, differential pressure transmitters, single flange transmitters, double flange transmitters, plug-in flange transmitters, etc. Like a pressure transmitter, in addition to measuring pressure, it can also measure the liquid level inside the equipment. When measuring liquid level in atmospheric pressure vessels, a pressure transformer is required. When measuring the liquid level of a pressurized container, two pressure transformers can be used, namely one for measuring the lower limit and one for measuring the upper limit. Their output signals can be subtracted to measure the liquid level, and differential pressure transmitters are generally used. It can also be used to measure the density of a medium while keeping the liquid level and pressure values constant inside the container. The measurement range of pressure transmitters can be very wide, starting from zero absolute pressure and up to 100MPa (in general).

TILLLQUIST transmitter VU40-154 company agent

No matter how the transmitter improves its accuracy, it still cannot overcome its inherent working characteristics, and errors are inevitable. The rapid development of computer technology provides broad prospects for the research and production of high-performance transmitters. The single-chip AC sampling transmitter has high cost-effectiveness, high accuracy, stable and reliable operation, and does not require frequent calibration.

The single-chip AC sampling transmitter has the following characteristics.

(1) Sampling period and timing

1) In the case where the high-order harmonic components are not large in the power grid, the sampling period can be selected as low rate methods such as 8 times and 12 times, which have lower requirements for microcontrollers and their equipment and are also simple for data processing; If the high-order harmonic components in the power grid are large, it is necessary to increase the sampling rate.

2) The timing of sampling, especially in low rate sampling methods, if the sampling timing happens to be at the peak valley point of high-order harmonics, it will have a significant impact on accuracy. Therefore, within the allowable range of devices and technology, the sampling frequency should be increased as much as possible to suppress the interference impact in the power grid.

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