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2. Range setting of Siemens electromagnetic flowmeter
The core of Siemens electromagnetic flowmeter range setting is to balance measurement range and accuracy, while strictly following fluid characteristics and process specifications.. 1. Setting principle: ① Fluid characteristic adaptation: It is necessary to focus on the chemical properties, viscosity, and temperature of the fluid to avoid measurement deviation caused by medium corrosion or interference from attachments. ② Extreme flow coverage: The maximum flow velocity of the measured fluid is specified for selecting sensor specifications, while the minimum flow velocity must meet the sensitivity threshold of the instrument to avoid loss of small flow signals. ③ Precision optimization: The range width is inversely proportional to the measurement accuracy, and the focus direction needs to be determined according to the process requirements. For example, in scenarios with strict accuracy requirements, the range can be appropriately reduced.
2. Setting steps: ① Sensor pretreatment: Clean the electrode and lining surfaces to eliminate the influence of scale or bubbles on conductivity detection, and use neutral solvents to wipe if necessary. ② Range boundary setting: Enter the corresponding flow value of 0-100% through the knob or HMI interface, and change it abruptly. For example, when the full range is set to 200m ³/h, 4mA corresponds to 0m ³/h, and 20mA corresponds to 200m ³/h. ③ Low flow calibration: Verify the linearity of the instrument at low flow rates using the specific gravity method or standard meter at the 10% range point. ④ Protocol parameter linkage: For sensors equipped with SENSPR
3. Example of Siemens S7-1200 PLC flowmeter programming
The core of Siemens S7-1200 PLC flowmeter programming is to read the standard signal of the flow sensor through the analog input module, and perform engineering value conversion and accumulation calculation.
.1. Hardware Configuration and Wiring 1 The hardware configuration ensures that the PLC system includes: - one S7-1200 CPU (such as CPU 1214C) - one analog input module (such as SM 1231 AI 4x12 bit) - one flow meter (outputting 4-20mA or 0-10V standard signals) 2 Module configuration in TIA Portal software: - In the device configuration of the project view, drag and drop the AI module to the right of the CPU. -Select the module and in "Properties">"General">"Input Configuration", choose the corresponding measurement type and range (such as "4-20mA") based on the actual output signal type (current or voltage) and range of the flowmeter. -Record the analog input address automatically assigned by the system (such as IW64)
3. Electrical wiring Taking a 4-20mA two-wire flowmeter as an example: - Connect the positive termin