Dilute acid temperature measurement

This post was last edited by kareale88 on 2018-12-24 at 13:12. Reference table for selecting materials for thermocouple and thermal resistor protection sleeves

It depends on your medium; use glass-lined steel, titanium, or other special materials.

Foreign UB6 material, or 316L will also work.

It’s not sufficient to just say ‘weak acid’; it’s necessary to specify exactly what kind of acid it is

The cheapest solution for lining with PTFE – it depends on the pH level; generally, 316L can also hold up for a while

Hydrochloric acid, sulfuric acid, phosphoric acid, and acetic acid exhibit varying degrees of corrosivity toward different materials depending on factors such as concentration and temperature; this depends on the process conditions.

This post was last edited by yunrun on 2019-1-3 at 21:11. Corrosion-resistant thermoresistors are used for measuring the temperature of highly corrosive chemical media such as sulfuric acid, hydrochloric acid, phosphoric acid, strong oxidizing agents, and organic solvents at any concentration. They are widely employed in industries such as fluorine chemistry, chlor-alkali production, pesticides, pharmaceuticals, and daily chemicals, within a temperature range of -180°C to 200°C. Corrosion-resistant platinum resistors are the most commonly used corrosion-resistant temperature sensors. Changhui Instruments specializes in the production of this. http://yunrun.com.cn/upload/201805/29/201805292207049066.png Anti-corrosion thermoresistors: yunrun.com.cn/product/122.html Polytetrafluoroethylene is not resistant to the corrosion caused by chlorine trifluoride, high-temperature chlorine trifluoride, high-speed liquid fluorine, liquid oxygen, and ozone. The protective tube of the anti-corrosion thermoresistor is made of 316L stainless steel combined with sintered polytetrafluoroethylene, and its service life is not less than one year. Why are some corrosion-resistant platinum resistors inexpensive? Clients often mention that the anti-corrosion platinum resistors from certain manufacturers are inexpensive. I would like to share the reason for this with you: Anti-corrosion instruments with low prices (including anti-corrosion platinum resistors, anti-corrosion float level gauges, anti-corrosion magnetic flap level gauges, etc.) basically use PTFE sleeves that are fitted directly over the protective tube of the instrument, at the flange connections and at the heat-sealed joints on the top. The typical characteristic of a tetrafluoro sleeve is that it is pale milky white, semi-transparent, or transparent, allowing the internal metal sleeve to be seen with the naked eye. This approach can provide corrosion protection; the protective layer is thin and the cost is low. The downside is that the lifespan of such corrosion-resistant instruments is short, requiring users to replace them frequently. Such items are inexpensive to buy but costly to use over time. You can choose to purchase them based on your own needs. http://yunrun.com.cn/upload/201606/20/201606201316564604.jpg