High Performance Bubble Level Meter For Accurate And Consistent Liquid Level Measurement

Selection of air-blowing level gauge

The air-blowing level gauge (also known as the bubble level gauge) is an instrument that uses the principle of pressure balance to measure the liquid level. Its selection involves multiple factors. The following are several key selection points:

1. **Measurement medium**
- The type of medium to be measured needs to be determined, such as water, oil, acid and alkali liquids, etc. Different media may have special requirements for the materials of the air-blowing pipe and pressure sensor, especially for corrosive and highly viscous liquids, which require corrosion-resistant materials (such as stainless steel, PVC, PTFE, etc.).

2. **Measurement range**
- The measurement range of the air-blowing level gauge is related to the length of the air-blowing pipe and the liquid height. The measurement range should be slightly larger than the actual required liquid level height to ensure that the level gauge can work properly.

3. **Air source**
- The air-blowing level gauge requires a stable air source for continuous or intermittent blowing, and the pressure is usually required to be below 0.5 MPa. When choosing, you need to consider whether a built-in air pump or an external air source is required.

4. **Accuracy requirements**
- Select the appropriate pressure sensor and calibration method according to the actual accuracy requirements. Common accuracy is between ±0.5%FS and ±1.0%FS. The higher the application accuracy, the higher the cost.

5. **Output signal type**
- The output signal types of the air-blowing level gauge include 4-20mA, 0-10V, digital signal (such as Modbus, RS485, etc.). When selecting, it should match the signal type of the field control system.

6. **Environmental conditions**
- It is necessary to consider factors such as ambient temperature, humidity, and vibration on site. If the ambient temperature is high or low, you may need to choose a model with temperature compensation. If used outdoors, you also need to consider the waterproof and dustproof level (such as IP65 or above).

7. **Installation method**
- The installation method needs to be selected according to the situation of the measurement point. Common ones include side installation and top installation. It is necessary to confirm that the installation position of the air-blowing pipe is convenient for access to the bottom of the liquid.

8. **Special requirements**
- If the liquid contains particles or suspended matter, you need to consider whether an anti-blocking design is required to avoid affecting the air flow stability of the air blowing pipe. In addition, if there is an explosion-proof requirement, you need to choose an air-blowing level gauge that meets the explosion-proof standard.

**Summary**
Selecting a suitable air-blowing level gauge requires comprehensive consideration of liquid type, measurement range, accuracy, signal output, etc. to ensure that the instrument meets the actual working conditions and measurement requirements on site.

The air-blowing level gauge (also called the gas-blowing level gauge) is an instrument used to measure the level of liquid media. The basic principle is to determine the height of the liquid level by blowing gas into a certain position of the measuring container and monitoring the flow rate or pressure of the gas. This type of level gauge is mainly used in places where it is not possible to directly contact the liquid, such as high temperature, high pressure or highly corrosive environments. The following are the main features and working principles of the air-blowing level gauge:

Working principle

1. **Gas blowing**: A gas blowing device is set at a specific position of the measuring container (usually the bottom or middle of the container). The gas is usually compressed air.

2. **Gas flow monitoring**: The blown gas will be subject to different resistance at different liquid level heights of the liquid. If the liquid level rises, the liquid will fill more parts of the container, resulting in an increase in the resistance to gas flow. Conversely, when the liquid level drops, the flow resistance of the gas decreases.

3. **Signal conversion**: By monitoring the changes in gas flow or pressure, combined with calibration information, the height of the liquid level can be inferred.

Main features

- **Non-contact measurement**: Since the measurement process does not directly contact the liquid, this level gauge is suitable for corrosive, hazardous or high-temperature liquid media.
- **Strong adaptability**: It can be used for level measurement of various containers and pipelines, especially in environments where traditional level gauges are not applicable.
- **Simple maintenance**: Since there is no direct contact with the liquid, the maintenance of the air-blowing level gauge is relatively simple, reducing failures caused by corrosion or sedimentation of the liquid medium.

Application areas
- **Chemical industry**: Storage tanks and reactors that handle corrosive or hazardous chemicals.
- **Oil and gas**: Used for high-temperature, high-pressure or corrosive storage tanks and transmission pipelines.
- **Food and pharmaceutical industries**: For liquid measurement that requires strict hygiene and pollution-free conditions.
In general, the air-blowing level gauge can accurately measure the level of liquids under various harsh conditions by providing a reliable non-contact measurement method.

Product application

In addition to being able to measure the level of clean liquids, the bubble level meter (air blowing level meter) is more suitable for corrosive corrosive liquids, liquids with high viscosity, liquids that are prone to crystallization, high temperature liquids, and liquids containing solid particles. Measurement of liquid level and some fluidized bed material levels and polymerization reaction material levels. Especially suitable for chemical fiber, chemical industry and other industries.

 Principle

The principle of blowing liquid level measurement is: insert a blowing pipe into an open container, and the air or inert gas (such as nitrogen) as the gas source is filtered through a filter. The adjustable pressure reducer (its function is to reduce the air supply pressure Reduce the pressure to a certain constant value (the size of the constant pressure is determined according to the measured liquid level) to ensure constant pressure at the blowing inlet. The clean air is then blown into the liquid to be measured 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 It escapes from the lower port of the blow tube inserted into the liquid, bubbles and is discharged through the liquid into the atmosphere. When there are trace bubbles (approximately 25~160L/H) discharged from the lower end of the blow pipe (due to the trace amount of bubbles and low gas flow rate, the loss of air along the way in the blow pipe can be ignored, so that the air pressure in the blow pipe is almost the same as the liquid level Static pressure is equal), so the pressure value indicated by the differential pressure transmitter reflects the liquid level.

  Characteristics

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

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

The structure is compact and sturdy, and the main components required for measurement can be integrated on one panel for easy installation and maintenance.

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

 Debugging steps of air-blowing liquid level gauge

(1) After the on-site installation of the air blowing device, differential pressure (pressure) transmitter and air blowing pipe is completed, the air tightness of the entire air blowing system should be ensured. Leakage in the air blowing system will bring large errors to the measurement results.

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

(3) Open the air source inlet and outlet stop valves on the panel of the air blowing device. With the end of the air blowing pipe open to the atmosphere, adjust the output pressure of the pressure reducing valve to 0.2-0.4 MPa and the air blowing flow rate to 30 L/H. Observe the difference. Check whether the indication value of the pressure (pressure) transmitter is zero.

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

 Parameter setting of air-blowing liquid level gauge

(1) Air source pressure: 0.4-0.8 MPa

(2) Output pressure of pressure reducing valve: 0.2-0.4 MPa

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

Packing & Delivery


FAQ
1. Q: What information need to be provided to choose the suitable model?
A: Application field, Nominal pressure ,Medium & medium temperture , Power supply , Output,
Flow range, Accuracy, Connection and other parameters.
2. Q: Are you a trade company or a manufacturer?
A: We are an ISO approved manufacturer specialized in level and flow measuring instruments.
OEM & ODM service are available. Welcome to visit us in China.
3. Q: What is your MOQ?
A: To start our cooperation, sample order is acceptable.
4. Q: What is your delivery date for the Intelligent Mini Micro Turbine Fuel Oil Diesel Flow Meter?
A: The delivery date is about 3-15 working days after receipt of payment.
5. Q: What is your payment terms?
A: We support T/T, PayPal ,Western Union.
For mass production order, it is 30% deposit in advance and 70% balance before shipment.
6. Q: Do you have a warranty for the Flow Meter?
A: Yes, we have the warranty of 12 months.