PTH Diaphragm Seals were designed as an alternative to the existing Rosemount High Process Temperature Transmitter. The seal, which can be directly mounted onto a transmitter without the use of remote seals or capillaries, can go up to temperatures as high as 392°F (200°C), though by using different fill fluids the temperature can go even higher, up to 788°F (420°C). This solution makes it possible to measure differential or gauge pressure at high process temperatures through a direct mounted seal.
The PTH Seal is designed and manufactured to meet the requirements of IEC 61518, with all the wetted parts constructed from AISI 316 (L).
Using BSO-22, the maximum process temperature it can withstand is 392°F (200°C). In combination with other filling fluids, the maximum process temperature can increase to 788°F (420°C).
Maximum Static Pressure
- 200 bar / 392°F (200°C)
- 250 bar / 68°F (20°C)
- 350 bar / 68°F (20°C) (design)
0,025% for the Diaphragm Seal + transmitter specifications
Mounting Position Effects
Zero shifts up to 15 mbar (at 180°C), which can be calibrated out. There is no span effect.
The PTH dimensions are designed according to the IEC standard 61518 and the seal is suitable for mounting to the process connectors according the DIN19213 1982 part 2 for manifold mounts.
Special Materials and Coatings
The PTH Seal can be supplied with various exotic
diaphragm materials, including Hastelloy C276, Monel or Tantalum. The process flanges can also be supplied with these exotic materials. Other materials are available on request.
For Hydrogen applications, the PTH Seal Diaphragm can be Gold Coated.
|Standard||0,24 mbar / Δ50°F|
|With temperature test||0,15 mbar / Δ50°F|
|Filling fluid||Temperature specifications|
|BSO-22 (standard)||-40°F to 392°F|
|BSO-40 (FDA approved)||5°F to 455°F|
|BSO-18||14°F to 599°F|
|BSO-42||14°F to 662°F|
|BSO-48||-4°F to 788°F|