Magnetic flap liquid level meter is widely used in electric power,petroleum,chemical industry,metallurgy,environmental protection,shipbuilding,construction,food and other industries in the production process of liquid level measurement and control.The product is developed according to the buoyancy principle and magnetic coupling effect.The red and white junction of the indicator is the actual height of the internal liquid level of the container,so as to realize the clear indication of the liquid level.
Working principle of magnetic flap level gauge:
First of all,let's understand the structure of the magnetic flap level gauge:each magnetic flap liquid level gauge has a cavity to accommodate the floating ball,which is called the main pipe or shell.It forms a connector with the container through flange or other interfaces.In this way,the liquid level in the cavity is the same height as the liquid level in the container,so the floating ball in the cavity will rise and fall with the rise and fall of the liquid level in the container A turning column display is installed outside the cavity,because magnetic steel is installed at the junction of the submerged liquid and the floating part of the floating ball during the manufacturing of the floating ball.When the floating ball and the floating ball rise and fall with the liquid level,its magnetism is transmitted to the turnover column display through the shell,pushing the magnetic column to turn 180 degrees;because the magnetic turning column is a cylinder composed of red and white half cylinders,it is turned 180°and then turned to the front Turn the column outside the display will change the color,the junction of the two colors is the height of the liquid level.
Principle of signal remote transmission output of magnetic flap level gauge:
The working principle of the magnetic flap liquid level meter with remote transmitter is that the magnetic float acts on the magnetic spring switch to change the number of resistance connected into the circuit,so that the sensor part can produce the electrical resistance signal corresponding to the liquid level change.Through the signal converter,the resistance signal can be converted into 4~20mA current signal.There are almost no energy storage components such as capacitors,inductors and so on.Communication protocol can be superimposed or bus communication can be used.
In order to expand the application range of magnetic flap level gauge,liquid level transmitting device can be added according to relevant standards and requirements to output a variety of electrical signals.Among them,4~20mA current signal is a common one.For example:while monitoring the liquid level,the magnetic control switch signal can be used to control or alarm the liquid level;on the basis of the turnover column level gauge,a 4~20mA transmission sensor is added to monitor the liquid level on site,and the change of the liquid level is transmitted to the control room through the transmission sensor,cable and instrument to realize remote monitoring and control.This is the real remote signal output of the magnetic turnover level gauge The principle and process of.
Its basic structure is as follows:
Level gauge reed
N resistors are connected in series on a circuit board,and there are n normally open dry reed tubes on each resistance.The magnetic float moves up and down to make the reed tube close short circuit.Parallel resistance makes the total resistance change linearly,and 4-20mA signal is output by the transformer!
Reed,also known as reed or magnetic reed switch,is a special magnetic sensitive switch,which is the main component of reed relay and proximity switch.It usually has two metal spring contacts made of soft magnetic materials,which are disconnected when there is no magnetic field,and some have a third spring which is normally closed.These reed contacts are encapsulated in glass tubes filled with inert gas or vacuum.The ends of parallel packaged reed plates in the glass tube overlap and leave certain gaps or contact each other to form the normally open or normally closed contacts of the switch.As long as a magnet is close to it,the two nodes of the reed will be pulled together to make the circuit conduction.The quality of reed directly affects the accuracy and service life of the remote transmission of the magnetic flap level gauge,so how to select the reed tube is what the manufacturer must pay attention to.