『On site flow meter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
Which flowmeter is more stable?
2. The flowmeter has signal and power lines, so the two lines that come from the site should enter the safety barrier on the intrinsic safety side ..
The power supply hall of the four wire flowmeter cannot achieve intrinsic safety (energy voltage exceeding), so the power supply part is treated as explosion-proof, and other parts are treated as explosion-proof or intrinsic safety. The signal line is connected to the safety barrier, and the power line is directly connected to the power supply or distribution barrier.
3. How does an electromagnetic flowmeter display instantaneous and cumulative values in the control room on site? What kind of work is needed, An ..
There are no different situations for this.
1. The installation location is very close to the control room (10-20 meters), so you can directly buy a separate one and install the display transmission unit to the control room.
2. If the installation distance is far away, you need to purchase a set of display control instruments (secondary meters). The flow meter inputs the flow signal to the display meter, and the two sliding sides set the range to display it.
3. If there is a PLC or DCS system in the control room, you only need to introduce the signal into the system, configure it, and the display can be completed.
. Of course, all of the above require first supplying power to the flowmeter, and secondly, laying a muffled wax signal cable from the flowmeter to the secondary meter or control system. The electrical signal provided by the flowmeter is generally a 4-20mA signal, which requires a shielded two core cable4. The flowmeter has signal and power lines, so the two 
The power supply part of the four wire flowmeter cannot meet the intrinsic safety standard because it is damaged due to its energy exceeding the limit. Therefore, the power supply part is treated according to explosion-proof standards. The other parts of the flowmeter can be treated according to explosion-proof or intrinsic safety standards. The signal line should be connected to the intrinsic safety side of the safety barrier. This is because signal lines transmit weak electrical signals rather than high-energy electricity. The power cord is directly connected to the power source or distribution grid because it transmits high-energy electricity. It should be emphasized here that the intrinsic safety side of the safety barrier is used to handle signal lines, not power lines. This is because the signal line transmits low-energy signals and does not cause explosions. The power line transmits high-energy electricity and is directly connected to the power source or distribution grid to ensure the normal operation of the flowmeter. Overall, in the design of a four wire flowmeter, the signal line and power line serve different functions. Signal lines are used to transmit weak electrical signals, while power lines are used to transmit high-energy electricity. This design can meet the functional requirements of the flowmeter and ensure its safe operation in hazardous environments. It is worth noting that in practical applications, the signal line and power line of the four wire flowmeter should be respectively connected to the corresponding side of the safety barrier. The signal line is connected to the intrinsic safety side, whi
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