Measurement Accuracy and Linearity Testing
Install the liquid level sensor in a liquid container with an adjustable height mechanism. Gradually vary the liquid level and record the sensor's output signal (voltage, current, or digital signal). By comparing the actual liquid level against the sensor's output values, calculate the measurement error and linearity to determine whether the sensor meets the specified accuracy requirements. This method can be used to verify the accuracy of the zero point, full-scale point, and intermediate points.
Response Speed and Dynamic Performance Testing
Rapidly alter the liquid level-for instance, by using a pump to control the rise and fall of the liquid or by simulating signal variations. By recording the sensor's output response time and fluctuation amplitude, evaluate its response speed and dynamic tracking capabilities. For float-type sensors, the sensitivity of the mechanical movement can be observed; for ultrasonic or radar sensors, the signal delay time can be measured using a data acquisition system.
Stability and Anti-Interference Testing
Operate the liquid level sensor within its intended working environment for an extended period, recording any fluctuations in the output signal to assess its long-term stability. Additionally, test the sensor's resistance to interference under conditions involving surface foam, vibration, or minor liquid surface disturbances. For electronic liquid level sensors, electromagnetic interference (EMI) testing is also required to ensure that the signal remains uncorrupted within typical industrial environments.
Environmental Adaptability Testing
Conduct simulated environmental tests-including exposure to high and low temperatures, humidity, corrosive liquids, and varying pressures-in accordance with the sensor's design specifications. By monitoring changes in the output signal under these varying temperatures, corrosive media, or sealed conditions, determine whether the sensor's environmental durability and protective capabilities meet the required standards.
Output Signal Verification
Test the analog voltage, current, or digital communication interfaces to ensure that the output range, signal fluctuation, and linearity align with the design parameters; additionally, inspect the wiring terminals and interface ports to verify their reliability.
