Electromagnetic flowmeter main parameters and adjustment methods

Project Overview

　　Electromagnetic flowmeter measurement accuracy, no pollution, no moving parts in the pipeline, no obstruction of flow parts, measurement of almost no additional pressure loss. These advantages make the electromagnetic flowmeter in a variety of industrial processes can play an important role in the control and optimization of the production process to provide an important basis for the electromagnetic flowmeter, that the main parameters and adjustment methods you understand?

　　First, the main parameters of electromagnetic flowmeter

　　(A) measurement range: that is, the flow meter can accurately measure the minimum and maximum flow value. Selected according to the actual flow requirements to determine the appropriate measurement range to ensure that the flow meter to meet process requirements.

　　(B) accuracy level: determines the measurement accuracy of electromagnetic flowmeter, usually expressed in percentage or absolute value, need to be selected according to the specific application requirements.

　　(C) electrode material: need to be compatible with the measured fluid, common stainless steel, Hastelloy, titanium and so on.

　　(D) lining material: used to protect the electrode and pipe, common polytetrafluoroethylene (PTFE), polyurethane, etc..

　　(E) output signal type: refers to the electromagnetic flowmeter output electrical signal type, common analog signals (such as 4-20mA, 0-5V, etc.) and digital signals. Analog signals are suitable for traditional control systems, digital signals are suitable for modern automation systems.

　　(F) operating voltage: the flowmeter required operating voltage, such as DC 24V, etc..

　　(G) shell protection level: such as IP65 or IP68, etc., indicating the flowmeter's dustproof and waterproof ability.

　　(H) electrode diameter: electromagnetic flowmeter internal liquid flow channel diameter, is also an important factor affecting the strength of the electromagnetic field, generally should be selected according to the flow range and viscosity.

　　Second, HSD electromagnetic flowmeter adjustment method

　　(A) zero adjustment: in the absence of flow through, adjust the zero output of the flowmeter to ensure that the output signal in the vicinity of the zero point. Zero adjustment is usually carried out through the flowmeter's local operator interface or remote communication for zero calibration, or can be adjusted by rotating the zero potentiometer until the reading is zero or close to zero.

　　(ii) Full-scale adjustment: Calibrate the flowmeter at its maximum flow point to ensure that the output signal matches the actual flow rate. Full-range adjustment can be achieved by setting the calibration coefficient or adjusting the upper and lower limits of the range, can also be adjusted by rotating the full-range potentiometer until the reading is the same or close to the same as the actual flow rate.

　　(C) measuring pipe diameter adjustment: in the installation of the flowmeter, should ensure that the measuring pipe diameter and the actual pipe size. If there is any deviation, it can be adjusted by replacing the measuring tube.

　　(D) sampling frequency adjustment: flow meter software settings, you can adjust the sampling frequency. Gradually increase the sampling frequency, observe the flowmeter's response speed and measurement accuracy, until the best results are obtained.

　　At the same time, it is also necessary to pay attention to the installation location of the electromagnetic flowmeter and environmental conditions, to avoid interference from external vibration and magnetic fields, as well as air bubbles, particulate matter or suspended solids. It is also necessary to check and maintain the electromagnetic flowmeter regularly to keep it in normal working condition. HSD series electromagnetic flowmeter is widely used in petrochemical, mining and metallurgy, coal, water conservancy engineering, water supply and drainage, sewage treatment and other industries, is the preferred instrument for enterprise flow measurement.