Application of IPRM hydrochloric acid inline refractometer

July 25 2022

  Hydrochloric acid is widely used in industrial use, soluble in water and lye, English name: Hydrochloric acid, chemical formula: HCl, alias hydrochloric acid, is an aqueous solution of hydrogen chloride, this product colorless or yellowish fuming liquid, pungent sour. It belongs to inorganic chemical inorganic acid, hydrochloric acid and sulfuric acid, nitric acid, hydrobromic acid, hydroiodic acid, perchloric acid are collectively known as six inorganic strong acids.

  Hydrochloric acid is dangerous in terms of safety, and its characteristics are summarized as corrosive substances, which are easy to cause corrosion, burns, and irritation of the respiratory system. In case of contact without protective measures, dilute and wash with plenty of running water immediately and seek medical advice.

  Hydrochloric acid in industrial use is a strong acid solvent, commonly used in metal processing industry, usually used as pickling steel, before the subsequent treatment of steel or just now extrusion, rolling, galvanizing process, hydrochloric acid can be used to react the surface of rust and iron oxides, hydrochloric acid concentration value between 18% and 20%. The use of hydrochloric acid determines the quality of the product.

  There are also hydrochloric acid products in daily necessities, and common products include daily necessities such as toilet cleaners and rust remover.

  There are currently two common methods for detecting hydrochloric acid concentration, one is manual titration, and the other is to obtain the concentration value by detecting the refractive index of the solution by the instrument.

  Manual titration:
  take about 3ml of this product, put it in a plugged Erlenmeyer flask with about 20ml of water and has been accurately weighed, weigh it accurately, add 25ml of water and 2 drops of methyl red indicator solution, and titrate with sodium hydroxide titration solution (1mol/L). Each 1ml of sodium hydroxide titration solution (1mol/L) is equivalent to 36. 46 mg of HC1.

  inline refractive method:
  Through the optical fiber emitted from the LED through the optical fiber from the side of the sapphire prism into the sapphire prism, and reach the prism and liquid boring contact surface, according to the different refractive index of the liquid at the contact surface, part of the light is fully emitted to the other side of the prism, the position of the total reflected light will change because of the critical angle change, the critical angle will be different because of the liquid refractive index, linear array CCD is used to accurately detect the position of the fully reflected back light, each scale on the receiver corresponds to the refractive index of the measured solution, Mathematical conversion with temperature compensation can obtain the concentration value of the measured solution.


  IPRM-EX880 hydrochloric acid inline-refractometer is an intrinsically safe explosion-proof concentration detection product launched by Chuyi measurement and control, suitable for inline detection of hydrochloric acid solution concentration in explosion-proof requirements, the product is divided into concentration sensor part, transmitter part, concentration sensor real-time measurement, transmitter with digital tube display and signal output, including 4-20mA analog signal and RS485 digital signal output, with 2 switching control signal output. The installation method is pipe bypass installation and small pipe diameter flow cell installation.

Main parameters:

Measuring range: 0.0 – 40.0% Resolution: 0.01%

Measurement accuracy: ± 0.1% Temperature compensation: 5-60°C

Input power: 24V DC protection level display part: IP65

Process pressure: < 1 MPa Wetted material: metallic tantalum

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