Industrial production the commonly used liquid level measurement instrument has double flange level gauge
, single flange level gauge, radar level gauge, magnetic flap liquid level meter, quartz tube liquid level meter, etc.
When the measured liquid density stable, the most simple, reliable and minimal maintenance measurements first double flange level gauge.
1, the structure of the double flange level gauge double flange differential pressure level meter by differential pressure transmitter, capillary and sealed diaphragm flange, through the measured liquid gravity to calculate liquid level height.
Method) and its level gauge has flat diaphragm and insert the diaphragm, generally using flat diaphragm liquid, viscous liquid with plug-in diaphragm.
2, double flanged principle of liquid level meter seal diaphragm role is to prevent the pipe in the medium directly into the differential pressure transmitter, it is between the transmitter and by filled with liquid (
Generally USES silicone oil)
Capillary connected, capillary filled with fluorine oil, when diaphragm pressure to produce tiny deformation, the deformation displacement or frequency through capillary liquid is passed to the transmitter, the transmitter converts the output signal after processing.
Double flange of liquid level meter using gravity to the size of the tank wall pressure, to detect the tank liquid level height, conforms to the formula of P = & rho;
H, here & rho;
Refers to the size, density of liquid tank g refers to the acceleration of gravity, so the pressure depends on the size of the tank the size of the liquid height.
3, double flanged liquid level gauge installation method double flange differential pressure liquidometers only commonly used in closed container level.
Double flanged liquid level meter title annotations on the H and L.
The H high side or positive pressure side;
L said low pressure side or suction side.
Double flange level gauge, according to the installation position can be divided into the following three ways: 1, double flange level meter installed in an airtight container bottom flange region below, transmitter installation in an airtight container bottom flange region below, as shown.
Its computation formula is as follows: 2, double flange level meter installed in an airtight container, flange horizontal middle flange level transmitter installation in an airtight container and low in the middle, as shown.
Its computation formula is as follows: 3, double flange differential pressure transducer installed in an airtight container top flange above the horizon, as shown in figure.
Its computation formula is as follows: can be concluded from the above calculation, regardless of the transducer installed in what position, its amount of span and moving zero is the same.
So, the double flange level meter range, and the calculation of the migration amount has nothing to do with the installation position.
Actual installation recommended in the first installation method, the other two make the silicone oil flow backward easily cause bellows bulge, damage the transmitter.
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