How to measure the liquid level when the ultrasonic level gauge is used on acetone
Yokelink supply a vast range of Industrial Fasteners to DIN, ISO & ANSI standards, including: Nuts, Bolts, Screws, Washers .There are hundreds of combinations of materials, heads, threads, plating, heat treating, and secondary operations. The materials and finishes including Steel, Brass, Stainless Steel, Aluminum, Zinc plating, Galvanized and Black. Providing standard and specialised Fastener solutions, coupled with industry customers. We also have the flexibility, capacity and expertise to manufacture fully customised fasteners specific to your application. Construction, Structural Bolts, ASTM F3125, ASTM A325, A449, A490, F436, F3125M, ASTM A563, F1554, Hex Bolt, High Strength Bolt,Extension Anchor Rod, Hex Heavy Nuts, A563 Nut, A194 Nuts, 2H Heavy Hex Nuts,DIN 7967,Alloy Steel Nuts,DH3, A563-DH Ningbo Yokelink Machinery Co.,Limited , https://www.yokelink.com
After using the devices for about two weeks, the customer contacted us, reporting that while the level measurements for liquid alkali, formaldehyde, and sulfuric acid were accurate, there was a significant error in the measurement of the acetone tank—up to 30–40%. We visited the site to investigate the issue and understand the situation better.
The POLO series ultrasonic level gauge was installed with the probe positioned 4 meters above the bottom of the tank. In the field, the actual liquid level of acetone was 2 meters, but the device showed only 1 meter. This discrepancy occurred because the speed of sound set on the ultrasonic level gauge was 331 m/s. However, acetone is a highly volatile liquid, which causes the gas phase inside the tank to have a different sound velocity than what the device was calibrated for, leading to inaccurate readings.
Our POLO series ultrasonic level gauges are equipped with a sound velocity adjustment feature. By modifying the set sound speed to match the actual sound velocity in the gas phase of the tank, we can significantly improve measurement accuracy.
Here’s how we resolved the issue:
First, we calculated the actual sound velocity in the gas phase of the tank:
1. The ultrasonic level gauge measured a liquid level of 1 meter, meaning the distance from the probe to the surface was 3 meters (4 meters – 1 meter). Since the sound wave travels down and back, the total distance is 6 meters (3 meters × 2). Dividing this by the default speed of 331 m/s gives us: 6 ÷ 331 = 0.01812 seconds.
2. The actual liquid level was 2 meters, so the sound wave traveled 4 meters (2 meters × 2). Using the time calculated earlier (0.01812 seconds), we determined the actual gas sound velocity: 4 ÷ 0.01812 ≈ 220.75 m/s, or approximately 221 m/s.
We then accessed the hidden menu of the POLO series level gauge by entering the password "0101". We adjusted the sound velocity setting from 331 m/s to 221 m/s and saved the changes. After this correction, the measured liquid level of acetone became 2.05 meters, very close to the actual value of 2 meters.
This case demonstrates how sound velocity calibration can effectively reduce large measurement errors, especially when dealing with volatile liquids. However, due to the constant fluctuations in gas composition and temperature within the tank, the accuracy after calibration may still be slightly lower compared to measuring non-volatile liquids like water. Typically, the error remains within 5% under these conditions.
For more information on ultrasonic level measurement in volatile environments, visit: http://news.chinawj.com.cn
Editor: Hardware Business Network Information Center | http://news.chinawj.com.cn