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1. Xuner Instrument | 485 communication wiring method for liquid turbine flowmeter
2. May I ask the difference between electromagnetic flowmeter, flow transmitter, and flow sensor.
Electromagnetic flowmeter is a general term, which generally comes in two types: integrated and split type. The integrated flow sensor and flow transmitter are most commonly integrated onto the flowmeter body. The split type generally integrates the flow sensor and flow meter body, and the flow transmitter is installed on site as a separate conversion body. The flow rate signal sensed by the flow sensor is converted into a weak electrical signal, which must be processed by the flow transmitter before it can be converted into a standard signal (4-20mA). At the same time, the transmitter also has extended functions such as flow accumulation, alarm output, and intelligent communication. A transmitter generally consists of a signal acquisition unit, a signal processing unit, and a power supply unit. The advantage of the split type is that it can reduce the impact of temperature and vibration on the transmitter in places with high temperatures and excessive vibration, extending its service life. For some flow meters installed at high positions, the split type can also be installed at a lower position for easy maintenance. Of course, there are certain length requirements for the cable between the split type flow transmitter and the high defect flow sensor, which should be specified when selecting.
3. What are the common faults of orifice flowmeter
There are many accessories used in orifice flowmeter, such as condenser, differential pressure transmitter, pressure transmitter, needle valve, three valve group, platinu
1. Leakage of pressure pipeline of orifice flowmeter: When measuring liquid and steam flow, the phenomenon of pressure pipeline leakage is relatively rare.
. Due to the high pressure or pressure of the liquid in the pipeline, any leakage can be easily observed. The dew point often occurs at the discharge outlet, where the discharge valve cannot be tightly closed due to corrosion or other reasons, and needs to be replaced if necessary. There are many interfaces in the pressure pipeline, which must be well sealed, and sealing gaskets must be used at the interfaces. Plastic pads can be used at low pressure and room temperature, while copper pads must be used at high pressure and places where there is a chance to come into contact with high-temperature fluids. In addition, the balance valve of the three valve group is occasionally found to be lax. When measuring air flow: Due to the pressure point being located on the air duct, there is often a slight or severe vibration caused by the obstruction of holes, resulting in a higher incidence of leakage. The leakage point is also difficult to directly observe. For example, if there are cracks in the welding points of the pressure pipe connection, or if the wind cap is shaken off, the transmitter has multiple interfaces and is prone to leakage. In daily maintenance, the tightness of the pressure pipeline should be checked regularly. The method is as follows: Connect the interface of the portable pressure calibrator to the impulse port of the transmitter, paying attention to using positive pressure on the positive pressure side and negative pressure on the negative pressure side (pump vac