What type of level gauge is used to measure the level of concentrated sulfuric acid?

Immersive, radar-based – all of these should work. If you need it, you can collaborate with our company.

This post was last edited by Wang Tianze on 2015-10-19 at 21:23. The measurement of sulfuric acid level in sulfuric acid plants is generally carried out at several locations such as the first absorption tank, the second absorption tank, the underground tank, and the storage tank for finished sulfuric acid. Should an ultrasonic level gauge or a radar level gauge be used for measuring the sulfuric acid level? Yunrun Instruments has constructed over thirty sulfuric acid production lines, and it continues to provide technical support as well as automated product spare parts to more than sixty sulfuric acid plants. Based on the feedback from these plants regarding their long-term operation, our recommendation is as follows: for measuring the sulfuric acid level in the first absorption tank, the second absorption tank, and underground tanks, anti-corrosion float level gauges should be used; whereas for measuring the level in vertical sulfuric acid storage tanks, high-frequency radar level gauges are the preferred choice! For sulfuric acid level measurement, should an ultrasonic level gauge or a radar level gauge be used? Regarding this issue, the technical staff from the sulfuric acid plant and Yunrun Instruments have reached the following consensus: The working principle of an ultrasonic level gauge is that high-frequency ultrasonic pulses are emitted by the transducer (probe), and these pulses interact with the medium being measured. The surface reflects the waves back, and some of these reflected echoes are received by the same transducer, where they are converted into electrical signals. Ultrasonic pulses travel at the speed of sound, and the time interval required from the emission to the reception of the ultrasonic pulse is proportional to the distance from the transducer to the surface of the medium being measured. The relationship between this distance value S, the speed of sound C, and the transmission time T can be expressed by the formula: S = C × T / 2. Ultrasonic pulses are emitted and transmitted at the speed of sound; upon encountering the surface of the medium being tested, they are reflected. Some of these reflected echoes are captured by the same probe and converted into electrical signals. Since the distance from the probe to the surface of the medium being measured is proportional to the time required for the same ultrasonic pulse to travel from emission to reception, the level height of the medium can be calculated from this. The antenna of a radar level gauge emits extremely narrow microwave pulses, which travel through space at the speed of light. When they encounter the surface of the medium being measured, part of their energy is reflected back and captured by the same antenna. The time interval between the transmission pulse and the reception pulse is proportional to the distance from the antenna to the surface of the medium being measured. Due to the extremely high speed of electromagnetic wave propagation, the time interval between the transmitted pulse and the received pulse is very small (on the order of nanoseconds), making it difficult to determine. High-frequency radar level gauges utilize a special correlation demodulation technique to accurately determine the time interval between the transmitted and received pulses, thereby calculating the distance from the antenna to the surface of the medium being measured. Radar level gauges and ultrasonic level gauges have similar resistance to sulfuric acid corrosion, but radar level gauges offer higher precision. Both dilute sulfuric acid and concentrated sulfuric acid exhibit volatility (acid mist), and foam of varying degrees forms on the liquid surface when the sulfuric acid pump is in operation. These factors can cause inaccuracies in the sound speed measured by ultrasonic level gauges, resulting in significant errors. Could this be because domestic ultrasonic level gauges have inferior technology compared to imported ones? In fact, there are also successful cases with well-known foreign brands of ultrasonic level gauges; feedback from numerous customers’ field applications shows that ultrasonic level gauges are not suitable for measuring sulfuric acid levels. Radar level gauges are more capable of overcoming the effects of gaseous media, dust, and other factors. As proven by extensive use in sulfuric acid plants, high-frequency radar level gauges provide excellent performance for measuring the level of sulfuric acid. When measuring the sulfuric acid level, the level gauge is usually installed at the top to facilitate maintenance and operation. Radar level gauges give inaccurate readings for measuring sulfuric acid levels; then why are corrosion-resistant float level gauges the preferred choice for measuring the sulfuric acid level in the first suction tank, the second suction tank, and the underground tank? This is because the anti-corrosion float level gauge offers a better cost-performance ratio for use in this application! Sulfuric acid storage tanks should be tall; the rods of anti-corrosion float level gauges are prone to bending, making such gauges unsuitable for use in sulfuric acid storage tanks. Most storage tanks in sulfuric acid plants use a combination of float level gauges and radar level gauges for measurement.

Pressure-type level gauge. Of course, it’s actually a pressure transmitter. . .

How about float level gauges? Radar ones work too; it depends on the situation

Radar with PTFE or directly PFA-coated is sufficient. . . .

Guided wave radar level gauge, corrosion-resistant version; contact me if needed

Damn, there isn’t a single reliable one. Note that I’m talking about horizontal tanks – are there any horizontal tanks with a diameter of 6-7 meters? Do we need to put it on the radar? If there’s a way to do it as suggested by the poster, then buy a single-flange level transmitter – with diaphragms made of membrane or tantalum, in HC version, lined with PTFE; it can also be gold-plated, whatever you prefer. If there is a gap at the top, you can consider installing a float level gauge with PTFE lining, which is cost-effective and convenient.