In the face of the selection problem of the liquid level meter, the following is a detailed ultrasonic level meter purchase guideline:
Define measurement requirements
- Measuring range: According to the actual need to measure the liquid level range to determine the ultrasonic level meter measuring range, and consider a certain margin. Different types of ultrasonic level meters have different measuring ranges, and it should be ensured that the range of the selected product can meet the actual needs.
- Accuracy requirements: Select the appropriate ultrasonic level meter according to the accuracy requirements of the application. Scenarios requiring high precision require a sensor with high precision to ensure the accuracy of measurement results.
Consider liquid properties
- Liquid type: Different types of liquid have different propagation speed and reflection characteristics of ultrasonic waves. When selecting an ultrasonic level meter, it is necessary to understand the impact of the liquid type on the measurement results, and calibrate and adjust according to the actual situation.
- Liquid properties: Understand the viscosity, corrosion, volatility and other characteristics of the medium to select the appropriate sensor and protection level. For the medium with strong acoustic absorption ability, it is not suitable to use ultrasonic level meter.
Evaluate the installation environment
- Environmental conditions: Consider the environment in which the level meter will be installed, such as temperature, humidity, corrosive gases, etc., and choose a level meter that can adapt to these conditions. Ultrasonic level meter can only be applied in the range of normal temperature and pressure, and some special models can withstand the process temperature may be higher, but it needs to be selected according to the actual use.
- Installation position: Select the appropriate installation position to ensure that the sensor can accurately measure the level and avoid interference. Avoid installation in vibration, shock or liquid agitated position, so as not to affect the measurement results.
- Installation mode: Select a suitable model and installation mode based on the installation conditions and requirements. Ultrasonic level meters usually have two types of installation, plug-in and non-plug-in, should be selected according to the structure and size of the container or tank.
Consider output and compatibility
- Output mode: The output mode of ultrasonic level meter generally has two modes: analog output (such as 4-20mA) and digital output (such as RS485). Select an appropriate output mode based on actual requirements to be compatible with the monitoring system or data acquisition device.
- Interface size: Consider the size and type of mounting interface to ensure that the level gauge can be easily installed on existing equipment.
Other notes
- Temperature compensation: The temperature change of some liquids will affect the propagation speed of ultrasonic waves. In certain cases, the temperature compensation function needs to be considered to ensure the accuracy and stability of the measurement results.
- Safety valve: For high pressure or toxic liquid containers, the corresponding safety valve should be set near the ultrasonic level gauge to ensure safe operation.
- Regular maintenance: In order to ensure the long-term stability and accuracy of the ultrasonic level meter, regular maintenance and calibration are necessary. The sensor surface should be cleaned regularly and the measuring range calibrated to ensure the normal operation of the equipment.
In summary, the selection of ultrasonic level meter needs to consider a number of factors and choose according to actual needs. By clarifying the measurement needs, considering the liquid characteristics, evaluating the installation environment, considering the output and compatibility, paying attention to the brand and after-sales, and paying attention to other aspects of the comprehensive consideration, you can choose the ultrasonic level meter that is more suitable for your application needs.