Product Application

Bubble level gauge (air-blowing level gauge) can measure the level of clean liquids, and is more suitable for corrosive liquids, liquids with high viscosity, liquids that are easy to crystallize, high-temperature liquids, liquids containing solid particles, as well as the level of some fluidized beds and polymerization reactions. It is particularly suitable for chemical fiber, chemical industry and other industries.

Principle

The principle of air-blowing level measurement is: insert a blow pipe into an open container, and the air or inert gas (such as nitrogen) as the gas source is filtered through a filter, and the adjustable pressure reducer (whose function is to reduce the supply pressure to a certain constant value, and the size of the constant pressure depends on the height of the measured liquid level) reduces the pressure to ensure that the pressure at the blow inlet is constant. Clean air is then blown into the measured liquid through the float flowmeter, constant flow valve and air blowing pipeline. The air blowing flow is indicated by the float flowmeter, and the flow rate is set by the flow regulating valve on the float flowmeter. The constant flow of gas escapes from the lower port of the air blowing pipe inserted into the liquid, bubbles and is discharged into the atmosphere through the liquid. When there are trace bubbles (about 25~160L/H) discharged from the lower end of the air blowing pipe (because the bubbles are trace and the gas flow rate is low, the air loss along the air blowing pipe can be ignored, so the air pressure in the air blowing pipe is almost equal to the static pressure of the liquid level), the pressure value indicated by the differential pressure transmitter can reflect the liquid level.

Features

The liquid level measurement system composed of the air blowing device has no moving parts. Except for the air blowing pipe, other measuring elements do not contact the measured medium.

Single meter installation, panel installation, optional single, dual or multi-channel structure.

Compact and sturdy structure, the main components required for measurement can be integrated on a panel, which is easy to install and maintain.

Fully mechanical structure, good sealing, low failure rate, and low maintenance.

Blowing type liquid level meter debugging steps

(1) After the blowing device, differential pressure (pressure) transmitter and blowing pipe are installed on site, the air tightness of the entire blowing system should be ensured. Leakage of the blowing system will cause a large error in the measurement result.

（2）The user first turns on the power supply of the differential pressure (pressure) transmitter and observes whether the differential pressure (pressure) transmitter indicates zero. If not, adjust the zero point of the differential pressure (pressure) transmitter.

（3）Open the gas source inlet and outlet stop valves on the blowing device panel. When the end of the blowing pipe is connected to the atmosphere, adjust the output pressure of the pressure reducing valve to 0.2-0.4 MPa and the blowing flow rate to 30 L/H, and observe whether the differential pressure (pressure) transmitter indicates zero.

（4）Insert the air blowing tube into the measured medium. When bubbles are blown out continuously and stably from the end of the air blowing tube, observe whether the corresponding relationship between the indication of the differential pressure (pressure) transmitter and the liquid level is consistent and whether the output is stable, and whether the air blowing volume is appropriate. If the corresponding relationship between the indication of the differential pressure (pressure) transmitter and the change of the liquid level is normal, it can be put into operation.

V. Instrument parameter setting of air-blowing liquid level gauge

(1) Air source pressure: 0.4-0.8 MPa

(2) Pressure reducing valve output pressure: 0.2-0.4 MPa

(3) Recommended air flow: 20~160 L/H (select the appropriate flow according to the on-site working conditions)