Fire pipe flowmeter | How to calculate the water flow rate inside the pipeline

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1. What is the difference between a fire pipe pressure switch and a pipe flow meter? The low-pressure pressure switch cover is used to control the normal pressure of the system pipe. If it is lower than a certain value, the fire pump will automatically start quickly. The flow meter is used to test whether the flow rate of the pump can meet the requirements after starting the pump.

2. The correct method for installing a fire ultrasonic flowmeter is to select a straight pipe section with full fluid flow and smooth flow, ensuring that there are straight pipe lengths of 10 times and 5 times the pipe diameter upstream and downstream, avoiding flow disturbances such as valves and elbows, and staying away from interference sources such as pumps and frequency converters.

. Before installing the sensor, the surface of the pipeline needs to be polished smooth, coated with coupling agent, and fixed with fixtures. Depending on the diameter of the pipe, the V method (≤ DN100) or Z method (>DN100) should be selected for installation. Adjust the position to ensure that the signal intensity is greater than 60 and the transmission time is stable within the range of 100 ± 3. Finally, perform zero point calibration. The installation position should be preferably selected in the middle of the vertical or horizontal pipe section to avoid gas accumulation at the top of the pipeline or scale buildup at the bottom, which may affect the measurement. It is strictly prohibited to install on the highest point of the pipeline or on vertical pipes with free outflow. For non full pipe conditions, it should be installed in U-shaped pipe sections. Cast iron pipes and rusted steel pipes must be thoroughly inspected and polished to a met

allic luster, while plastic pipes require the use of specialized coupling agents. There should be no air bubbles or sand particles between the sensor and the pipeline, and the clamping fixture should be moderately tightened to ensure good contact. When wiring, connect the power supply, signal line, and 4-20mA output according to the instructions, and ensure that the shielding layer is reliably grounded. After installation, check if all connection points are secure, confirm that the instrument display is normal and there are no alarm messages, and regularly maintain, clean, and calibrate to ensure long-term stable operation.

3. How to wire the ultrasonic flowmeter for fire pipes

The wiring of the ultrasonic flowmeter for fire pipes should be connected to the corresponding terminals of the host according to the upstream and downstream sensors: the upstream probe should be connected to the 5th and 6th terminals in the lower row of the host from left to right, and the downstream probe should be connected to the 2nd and 3rd terminals;

1. T

1. GND, and the return water should be connected to TX

2. T

2. GND (shared by GND); Relay switch quantity is connected to RELAY+and RELAY -. Before wiring, be sure to disconnect the power and confirm that the host model matches the sensor to avoid reverse connection or misalignment. When installing with external clamps, it is necessary to

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