Vortex Integral Flow Meter| Manufacturer of water flow meter source

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1. Who knows what are the flow meters based on mechanical principles?

Except for thermal flow meters, ultrasonic flow meters, and electromagnetic flow meters, almost all flow meters rely on mechanical principles in their principles. Flow meters utilizing the principles of dynamic pressure energy absorption and static pressure energy conversion: orifice plate flow meter, nozzle flow meter, 1/4 circular nozzle flow meter, Venturi tube flow meter, V-plug tube flow meter, laminar flow meter, weir flow meter; Flow meters utilizing the principle of fluid dynamic pressure: target flow meter, baffle flow meter, pitot tube flow meter, constant velocity tube (Anubadi tube) flow meter, dynamic pressure tube flow meter, bend tube flow meter, annular tube flow meter, turbine flow meter, rotor flow meter, rotor flow meter. Flow meters utilizing the principle of fluid oscillation: vortex flowmeter, vortex flowmeter, Coriolis principle flow hole flowmeter; mass flowmeter utilizing the principle of volume integration: elliptical gear flowmeter, waist wheel (Roots) flowmeter, scraper (cam, concave line) flowmeter, rotary piston flowmeter, disc flowmeter. Wet flowmeter, skin bag flowmeter;

2. How to write the S7-200 PID flow control program

The core of the S7-200 PLC flow control PID program is to build a closed-loop control process, which controls the regulating valve by collecting flow sensor signals, comparing set values, and outputting regulating quantities. The following are complete and practical writing steps: 1 Pre hardware preparation and signal matching - Flow sensor selection: Priority should be given to using 4~20mA standard output vortex/turbine flow meters, matched with S7-200 EM231 analog input modu

le - Execution mechanism selection: choose 4~20mA controlled electric regulating valve, matched with EM232 analog output module - Wiring confirmation: The positive and negative poles of the sensor are connected to the input channel of EM231, the control signal of the regulating valve is connected to the output channel of EM232, and the common terminal is uniformly connected to the 24V negative terminal. 2. STEP 7-MicroWIN programming basic configuration - New project, add S7-200 CPU model (such as CPU224XP), mount corresponding analog module - Configure analog range: Set the flow acquisition channel range of EM231 to 4~20mA corresponding to 0~100% flow, convert the numerical value after conversion. 6400~32000; The output channel of EM232 is also set to 4~20mA corresponding to the 0~100% opening of the regulating valve, with an output value range of 6400~320003 The following is a code logic that can be directly applied by mixing ladder diagram and instruction table for PID control core program writing: 1 Analog quantity acquisition and standardization//Read flow analog quantity input AIW0//Assuming the flow sensor is connected to EM231 channel 0//Convert to engineering unit flow value, formula: flow value=(AIW0-6400) * upper range limit/25600//Example: range 0~100m ³/h, then each unit value corresponds to 0.003125m ³/h MOVW AIW0, VW100/D 25600, VW100 * R 100.0, VW100//Convert to percentage flow value for subsequent PID calculation 2 PID loop configuration S7-200 built-in PID wizard can quickly generate subroutines: - Open the tool ->PID wizard, set the loop number to 0- Enter the set value storage address: such as VW200 (users can modify the set flow rate through the touch screen/button) - Process variable input address:

Vortex Integral Flow Meter

1. Who knows what are the flow meters based on mechanical principles?

2. How to write the S7-200 PID flow control program

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