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Please include the sample temperature of the respective measurement.

Page 23 is the trouble shooting guide for a related model. You may just need new pumps.

Spend some time in the control room to understand what the operators have to deal with.

Stop all motion, where there is risk of injury.

Depends on the level of redundancy you need for safety.

Sounds like you may be dealing with load changes on the turbine, the Gt experts will jump in soon

Sensor can fail. Are these RTD or T/C's.

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.