DN65 electromagnetic flowmeter Shanghai

DN65 electromagnetic flowmeter Shanghai

There are two possible reasons for negative slope: incorrect beam alignment adjustment. If the axis is shorter than 1m, it may be due to incorrect material thermal expansion compensation coefficient, incorrect material temperature measurement, or incorrect wavelength compensation. Pitch and yaw cause Abbe bias errors and machine tool linearity errors. The measures that can be taken to address the above issues are: if the axis travel is short, check the alignment of the laser; Check if EC10 and measuring head are connected and responsive; Check if the input manual environment data is correct; Check whether the material sensor is correctly positioned and whether the input expansion coefficient is correct; Perform a new measurement using an angle optical lens to check the pitch and yaw errors of the machine tool.

Split type electromagnetic flowmeter is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines. Including highly corrosive liquids such as acids, alkalis, salts, etc. This product is widely used in industries such as petroleum, chemical, metallurgical, textile, food, pharmaceutical, papermaking, as well as in fields such as environmental protection, municipal management, and water conservancy construction.

DN65 electromagnetic flowmeter Shanghai

The measurement process involves connecting a Hall sensor that measures the rotational speed coaxially with the motor shaft. For each revolution of the shaft, a certain number of pulses are generated, which are output by the Hall device circuit. Become the counting pulse of the speed counter. At the same time, the pulse output amplitude of the Hall sensor circuit is 12V, which is reduced to 5V after photoelectric coupling, and kept consistent with the logic level of the AT89C51 microcontroller. By controlling the counting time, the counter's count value can correspond to the shaft's speed value. The main CPU processes the value data and displays it on the digital display. This system uses the 0INT interrupt in 89C51 to count speed pulses. Timer T0 operates in timing mode and in mode 1.

Electromagnetic flow meters are classified according to the assembly method of converters and sensors, including split type and integrated type.

Split type electromagnetic flowmeter is a commonly used form of electromagnetic flowmeter, as shown in the figure below. The sensor is connected to the pipeline, and the converter is installed near the sensor in the instrument room or easily accessible to people, with a distance of tens to hundreds of meters.

To prevent external noise from entering, signal cables usually use dual core shielded wires. When measuring liquids with low conductivity and gathering for more than 30m, in order to prevent signal attenuation caused by partial capacitance of the cable, it is also required to connect a shielding driver with the same potential and low impedance source as the core wire to the inner shielding. The converter of the split type electromagnetic flowmeter can be kept away from harsh on-site environments, making electronic component inspection, adjustment, and parameter setting more convenient.

The relationship between CAN baud rate and transmission distance. Since cables all have parasitic capacitance, what is the impact of parasitic capacitance on the CAN bus? We use CANScope to simulate adding different capacitors to the bus and use eye diagrams to see what happens. For example, we can see that as the capacitor increases, the falling edges of the explicit and implicit bits become slower and slower. The influence of different capacitance of cables on waveform. When CANL is short circuited to ground on the bus, only the CANH line maintains CAN transmission. In this case, the CAN bus is similar to single wire CAN, and the advantage of differential transmission is completely lost. Let's take a look at what happens when CANL is short circuited in high-speed CAN.

The measurement principle of split type electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The split type electromagnetic flowmeter consists of a sensor and a converter. The sensor is installed on the measurement pipeline, and the converter is installed within 30 meters or 100 meters from the sensor. The two are connected by a shielded cable.

M9703A has real-time DDC function and ultra-high bandwidth, which can be used as a solution for this testing system, especially suitable for calibration applications. The multi module processing synchronization function can provide phase coherence between channels. Although the reference solution is aimed at narrowband measurements, M9703A can also capture signals with wider bandwidths (up to 300MHz when using DDC features and up to 600MHz when not using DDC). Assuming that most phased array antennas operate at RF/microwave frequencies and use an intermediate frequency to digital converter, it is necessary to use analog mixing technology to down convert the captured signal to the intermediate frequency within the M9703A passband.

1. Measurement is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;