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does this happen in steady conditions

You may find this helpful https://www.csiheat.com/-/media/ametekcsiheat/documents/support/csi%20technical%20papers/preventing-corrosion-in-sulfur-storage-tanks.pdf?la=en

Proper valve selection and design.

You can do it, but you won't be able to afford the equipment, the installation, and continual maintenance checks.

You don't measure the acidity on line, you heat and agitate the molten sulfur to purify it.

RTD's are traceably accurate, but are extremely vulnerable to high vibration if not mechanically secure. For example in thermowell installations, most RTD's have a vibration limit of 10G's (1 G is equivalent to a drop to the floor from a height of 1 meter), but vulnerable to sustained...

What tests have you carried out?

Huu Phu, If a lightning strike was involved, a lightning arrestor (spark gap to earth ground) is required to limit the voltage peak below the voltage rating of the blown fuses.

Capacitance is strictly important when dealing with high voltage. With 24VDC current instrumentation wiring the risk of arcing is drastically smaller. If you are seeking explosion proof installations, even the maintenance procedures and proximity to dangerous substances are involve. Even then...

Are two measurements involved? If so what sensor type (TC type, RTD) , wiring, and transmitters involved. The only way two sensor can read the same (within uncertainty limits) is if the sensor and transmitters have been calibrated in a lab traceable to a national standard.

Linear systems are easy, it is the time delays, and nonlinear effects, etc.

"What is the typical hydrogen usage for generation facilities? The amount of hydrogen used per day is generally a function of the power generator capacity and the condition of the generators hydrogen seals. The higher the capacity, the higher the hydrogen pressure required for sufficient heat...

Check your heat exchangers that cool the H2.

You are dealing with transport delay and thermal response lag, use proportional only to avoid overshoot.

With an intermediate speed control on the motor, you control system needs to be designed for speed control at least how you have defined the system.

Well said!

copper wire cable works

as long as adequate pressure rating, pipe size, and flow/deltaP requirements are met, it can be considered..

pressure reduction required, otherwise you might consider tracking conductivity, or corrosion monitoring

None that could be used in actual service. You'll need to consider the equilibrium constants of the various ionic species at those temperatures as free H2SO4 probably does not exist as a separate component.