High frequency radar level gaugeThe on-site calibration methods mainly include the following:

1、 Conventional online calibration

1. Principle: Using on-site process conditions and changes in liquid level, the output value of the radar level gauge is compared with the actual liquid level measurement value (such as gauge measurement value).

Step 2:

Check if the installation position and angle of the radar level gauge are correct, ensuring that its antenna can cover the liquid level.

Using on-site process conditions, observe the output value of the radar level gauge through changes in liquid level.

Compare the output value of the radar level gauge with the actual level measurement value, and perform multi-point or single point calibration according to the "Calibration Regulations for Level Gauge Measurement".

Adjust the radar level gauge using debugging software to achieve the required measurement accuracy.

3. Precautions:

During online calibration, on-site process equipment (such as storage tanks or reaction tanks) may need to stop production, so calibration time should be arranged reasonably to reduce the impact on production.

The on-site liquid level changes are affected by process conditions, and the stabilization time may be longer, requiring patient waiting.

2、 Reference point calibration

1. Principle: Single point calibration of the radar level gauge is performed by setting a reference reflection point. Set a reflector element at the full range position of the radar level gauge beam, accurately measure the distance between the reflector element and the radar level gauge, and calibrate by comparing the measured value of the reference point with the known value of the radar level gauge.

Step 2:

InHigh frequency radar level gaugeInstall reflective elements at the full range position of the beam.

Accurately measure the distance between the reflective element and the radar level gauge using standardized equipment, and record this value as a known value.

Activate the radar level gauge, measure the position of the reflective element, and compare the measured value with the known value.

Adjust the measurement value of the radar level gauge based on the comparison results to make it consistent with the known value.

3. Precautions:

The reference point should be set at the full scale position, as the general process liquid level will not reach the full scale, so calibration will not affect normal production.

Short full-scale distance and high reflection intensity can make the reflection element small enough to reduce the interference of the reflector and ensure the actual measurement of liquid reflection wave intensity.

3、 Zero and full-scale calibration

1. Zero point calibration: place the radar level gauge at a known zero point position (such as horizontal ground or static water surface), and then adjust the zero point of the instrument.

2. Full scale calibration: place the radar level gauge at a known full scale position (such as a full water tank), and then adjust the full scale of the instrument.

4、 Linear calibration

If there is a non-linear relationship between the output signal of the radar level gauge and the water level, linear calibration can be performed. Take multiple measurements at different water levels, draw a linear curve, and adjust the output signal of the instrument based on this curve.

5、 Other precautions

During the calibration process, it should be ensured that the installation position of the radar level gauge is correct to avoid signal interference and errors.

2. Regularly check the cleanliness of the antenna and keep its surface clean to ensure measurement accuracy.

3. Adjust equipment parameters according to actual situations, such as empty tank calibration, full tank calibration, and wave velocity compensation.

4. Use the signal processing function of the device to filter out invalid interference signals to improve measurement accuracy.

　　High frequency radar level gaugeThe on-site calibration methods include conventional online calibration, reference point calibration, zero and full-scale calibration, and linear calibration. In practical operation, appropriate calibration methods should be selected based on the on-site environment and equipment conditions, and operations should be carried out in accordance with relevant regulations and requirements.