Problems with sulfuric acid desiccant concentration meters
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In our sulfuric acid plant, the dry absorption acid concentration meters have not been performing well over the past few years; their readings are often inaccurate. I have also tried several different manufacturers, such as DDK, Yokogawa, Chuanyu, and others. But none of them are ideal, especially the first and second inhalations. I’d like to ask if anyone has any useful tips; please share your experiences!
With a non-contact ring conductivity meter, it can be used for 20 years without problems as long as it is properly maintained.
What the original poster mentioned are all instruments based on conductivity. The main issues relate to two points: ① Fresh sulfuric acid is usually of 98% concentration; as it absorbs moisture, its concentration decreases, and once it drops to a certain level, it is discharged as waste acid. Since the conductivity measurement shows a turning point at a sulfuric acid concentration of around 92%, it is definitely impossible to conduct monitoring across that range. ②The measurement of sulfuric acid concentration using conductivity establishes a two-dimensional relationship between conductivity and concentration; if moisture is absorbed along with large amounts of process impurities, the original curve relationship will deviate significantly, resulting in reduced accuracy.
For the absorption tower, conductivity is suitable; for the drying tower, a refractometer is more effective
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Does no one use Foxboro? I guess it’s not a problem with the acidity meter in your case
http://www.dyjkjd.com/index.html CL100 series conductivity and pH meters, with a flow-through design and DN25 flange connections. The measuring element does not come into direct contact with the medium being measured, and there is no polarization effect; it is particularly suitable for measuring the concentration of highly corrosive media such as strong acids, strong bases, and salts. These instruments are widely used in power generation plants, the chemical industry, metallurgy, pharmaceuticals, food processing, and environmental protection sectors for continuous online monitoring of acid, alkali, and salt concentrations or conductivity, as well as in CIP processes for the food and beverage industry. I. Main Technical Specifications 1. Measurement Range a) Concentration Measurement Media Hydrochloric acid Sulfuric acid Nitric acid Sodium hydroxide Saltwater Concentration Range (%) 0–10 25–40 0–25 35–80 94–99.5 35–50 0–10 25–40 0–4 27–30 Note: The above media are not the only options; for other media, separate charges will apply for the generation of conductivity curves. b) Conductivity: 0～50(mS/cm) ； 0～200(mS/cm) ； 0～500 ； 0～1000(mS/cm) ； c) Temperature: 0～150℃ ； Instrument accuracy: Class 1.0 ； Temperature compensation range: 0～150℃ ； Temperature coefficient compensation range: 30 steps (0～9.99)%/℃ (adjustable) ； Concentration linearization: 30 segments ； Maximum operating temperature of the measurement probe: 150℃ ； Maximum operating pressure of the measuring probe: 10 MPa ； The measurement probe is made of polymer materials with excellent corrosion resistance, making it suitable for all acids, bases, and salts ； II. Operating Conditions of the Instrument Ambient temperature: 0～50℃ Relative humidity: ≤90% Power supply: DC24V ； Load capacity: 0–500Ω. Protection rating: IP68. Output: 2 channels of 4–20mA; concentration, conductivity, and temperature can be selected as needed, to supply measurement, indication, and process control for indicators, recorders, regulators, PLCs, DCS systems, etc.
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