Look for limit switches that are not NAMUR
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For LNG, non-NAMUR, intrinsically safe, capable of operating at temperatures as low as -40 degrees. I installed it on the valves from Xin Guoli; those from P+F seem to all be of the NAMUR type. The safety gate connected to my DCS does not output a 8V voltage. I would appreciate it if experts could recommend some limit switches with a good reputation available on the market.
The limit switch of p+f must be equipped with a dedicated safety barrier. There are many non-Namur domestic products, which are mechanical switches; however, intrinsically safe types are relatively rare.
LNG is a blast-proof area, and it should ideally be equipped with NAMUR signals
The passive dry-contact feedback switches from Top-Works or Stonel can meet your needs
Mechanical ones are better; generally, Yaskawa valves are used quite frequently in such applications. Because they also have a locator at their home. It is relatively convenient to use.