XDB500 liquid level sensor - Solving Interference Problems in Immersion-Type Liquid Level Transmitters

The XDB500 liquid level sensor is an immersion-type liquid level transmitter that boasts high stability and accuracy, making it an ideal choice for a wide range of industrial applications. However, as with any measurement device, interference can be a significant issue that impacts the sensor's performance and accuracy. In this article, we will discuss some of the common interference problems encountered when using immersion-type liquid level transmitters and provide some solutions to overcome them.

One of the most significant interference problems with immersion-type liquid level transmitters is caused by the pressure fluctuations that occur when liquid flows down onto the sensor probe. This can cause significant pressure oscillations that result in inaccurate measurements and signal instability. To overcome this problem, there are several solutions that can be employed.

The first solution is to prevent direct pressure impact on the sensor probe by using deflectors or other objects to block the liquid flow. This can be effective in reducing fluctuations caused by the liquid flow.

The second solution is to use a showerhead-style inlet, which divides the water flow into smaller streams, reducing the pressure impact on the sensor probe. Alternatively, the inlet pipe can be bent upwards to create a slight upward angle, causing the water to first splash upwards before falling on the probe. This reduces the direct impact of the water and helps to convert the kinetic energy into potential energy.

To ensure accurate measurements, it is also important to calibrate the sensor correctly. The XDB500 liquid level sensor is factory calibrated to the specified range and requires no further calibration unless the density of the medium changes significantly. However, if calibration is necessary, the following steps can be taken:

1. Remove the protective cover and connect a standard 24VDC power supply and current meter with an accuracy of 0.2% or higher.

2. Adjust the zero-point resistor until the output current is 4mA when there is no liquid in the sensor.

3. Fill the sensor to full capacity and adjust the full-scale resistor until the output current is 20mA.

4. Repeat the above steps two or three times until the signal is stable.

5. Verify the accuracy of the sensor at 25%, 50%, and 75% of the measurement range.

6. For non-water media, the sensor should be calibrated with water and the pressure readings converted to the actual density of the medium being measured.

7. After calibration, replace the protective cover.

The XDB500 liquid level sensor should be recalibrated annually.

In conclusion, the XDB500 liquid level sensor offers high accuracy and stability, making it an ideal choice for many industrial applications. However, interference can impact its performance, and the above solutions can help to overcome these problems. Proper calibration is also essential to ensure accurate measurements, and the steps outlined in this article can help achieve this.