The UHZ-111/F electric remote transmission corrosion-resistant magnetic float level gauge uses steel plastic composite pipes for all parts in contact with the medium (Figure 6 shows a pure F4 tube)
So it can be applied to liquid level measurement and control of various highly corrosive media

Basic Parameters
Medium temperature: F4 ≤ 200. C
Steel lined polypropylene: -25 to+110. C
Steel lined polyethylene: -15-+70. C
Steel lined PTFE: -100 to+250. C