Street flowmeter wiring, debugging method - Database & Sql Blog Articles

Today, I'm going to explain the wiring and debugging procedures for street flowmeters. These devices are crucial in various industrial applications, especially in monitoring liquid or gas flow rates accurately. **1. Terminal Block Diagram** Understanding the terminal connections is essential before starting any installation. The sensor transmitter requires a power supply of either +12VDC or +24VDC. The signal output is typically a pulse signal, and the ground connection should be made using shielded cables to minimize interference. **2. Wiring Procedure** Begin by removing the back cover of the device. Feed the signal cable through the waterproof connector and make sure all connections are correctly matched with the wiring diagram. Tighten the waterproof joint securely. It's important to ensure that the cable bends downward before entering the joint to prevent moisture from entering the housing. **3. Pre-Power-Up Checks** Before powering up the vortex flowmeter, verify that the power supply voltage matches the required specifications and that all electrical connections are correct. Once confirmed, the meter can be turned on. Most meters come pre-calibrated and tested at the factory, so they should operate normally upon initial startup. **4. Debugging Pulse Output Vortex Flow Sensors** Although these sensors are calibrated before leaving the factory, field conditions such as vibration or differences in the measured medium may require adjustments. For example: - If the display shows a signal when there’s no flow, adjust potentiometer W2 clockwise to reduce sensitivity and eliminate false readings caused by vibrations. - If the signal is unstable at low flow rates, slowly adjust W1 to lower the amplification factor until multi-trigger signals are eliminated. Refer to the schematic for test points: TP0 is grounded, TP1 is the first-stage output, TP2 is the second-stage filter, and TP3 is the square wave output. **5. 4–20mA Output Type Vortex Transmitter** This type of transmitter uses two boards: a pulse amplifier board and a current output board. Adjustments on the preamplifier board follow similar steps as above. The full-scale adjustment (W1) corresponds to the upper flow limit frequency, while the zero point (W2) corresponds to the lower limit. These settings are usually done at the factory and don’t need user intervention unless major changes occur. **6. Battery-Powered On-Site Display Vortex Flowmeter** This model combines a vortex flow sensor with an on-site display, powered by batteries. It offers advantages like compact size, high reliability, and no external power requirement. It’s ideal for use in petroleum, chemical, and food industries where portability is key. **7. Parameter Settings and Operation** Authorized engineers can access parameter settings via the instrument panel. Use the Enter and F keys to navigate menus, and press F and the key simultaneously to clear accumulated flow. The three-point coefficient correction ensures accurate nonlinear flow measurements. Each menu displays a specific flow point frequency and corresponding meter coefficient. **8. 24VDC Power Supply On-Site Display Meter** This version adds a 24VDC power supply and 4–20mA transmission capability, making it suitable for integration with computers, DCS systems, and other control platforms. The fourth menu allows setting the 20mA output value, which corresponds to the maximum flow rate. Adjusting V3 and V4 resistors on the board can fine-tune the output if needed. **9. Temperature-Compensated Vortex Flowmeter** This advanced model includes temperature and pressure compensation features. It displays real-time data on two or three lines, showing instantaneous flow, cumulative flow, pressure, temperature, and more. A bar graph on the right side of the screen helps visualize whether the flow is within acceptable limits. **10. DIP Switch Configuration** The transmitter uses three DIP switches (SW1, SW2, SW3) to adapt to different pipe sizes and media types. The switch positions must match the specifications provided in the manual to ensure proper operation. **11. Internal Calculation Formula** The working volume flow rate (Q) is calculated using the formula Q = F / K, where F is the pulse frequency and K is the meter factor. For gases, the volume flow is converted to standard conditions using pressure and temperature values. In summary, proper wiring, calibration, and parameter configuration are essential for the optimal performance of vortex flowmeters. Always refer to the manufacturer’s guidelines and consult a professional if unsure about any step.

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