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

Today, I'll walk you through the wiring and debugging process for street flowmeters. This guide is designed to help both beginners and professionals understand how to properly install and configure these devices. 1. **Terminal Block Diagram** Understanding the terminal layout is essential. The sensor transmitter typically uses a +12 or +24VDC power supply, with 0VDC as the ground. The signal output is usually in the form of a pulse, and it's important to ensure proper shielding and grounding to avoid interference. 2. **Wiring Procedure** Begin by unscrewing the back cover of the device. Feed the signal cable through the waterproof connector and connect it according to the wiring diagram. Make sure the waterproof joint is tightly secured, and always bend the cable 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. If everything checks out, proceed with power-on. These meters are usually pre-calibrated at the factory and should operate correctly once powered on. 4. **Debugging Pulse Output Vortex Sensors** Although the sensors are pre-adjusted, field conditions may require fine-tuning. For example: - If the display shows a signal when there's no flow, adjust potentiometer W2 clockwise to reduce sensitivity. - If the signal is unstable at low flow rates, adjust W1 to lower the amplification factor until the multi-trigger issue is resolved. 5. **Adjusting 4–20mA Output Transmitters** For two-wire 4–20mA transmitters, adjustments are made on two boards: the pulse amplifier board and the current output board. Potentiometer W1 controls full-scale adjustment, while W2 sets the zero point. These settings are usually pre-configured and only need to be adjusted if significant changes occur. 6. **Battery-Powered On-Site Display Flowmeters** These devices combine the sensor with an on-site display, using low-power microcontroller technology. They are compact, reliable, and ideal for applications where external power is unavailable. They offer advantages such as anti-lightning protection, high accuracy, and cost-effectiveness. 7. **Parameter Settings** Only authorized engineers should access the parameter settings. Use the "Enter" and "F" keys to navigate menus, and the "F" key to switch between different settings. Clearing accumulated flow can be done by pressing specific buttons simultaneously. 8. **DIP Switch Configuration** The DIP switches (SW1, SW2, SW3) allow the same circuit to be used for different sizes and media. Adjust them based on the specific application, following the provided table for accurate configuration. 9. **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, additional corrections for pressure and temperature may be necessary. 10. **Final Notes** Most flowmeters come pre-calibrated and require minimal adjustment. However, if issues arise, refer to the manual for detailed troubleshooting steps. Always ensure proper installation and maintenance to maximize performance and longevity.

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