Gefran’s HWJ series Melt sensors are pressure transmitters with HART communication protocol designed for use in high-temperature environments with the presence of a potentially explosive atmosphere. The key feature is that they can read media pressure up to temperatures of 315°C.
The construction principle is based on the hydraulic transmission of pressure; the transfer of mechanical stress is via an incompressible transmission fluid.Strain gauge technology allows the physical quantity pressure, to be transduced into an electrical signal.
The transmitters are designed and manufactured according to ATEX Directive 2014/34/EU, IECEx Scheme standards, the following protection modes and characteristics:
- Group II, category 2G, 2D (EPL Gb/Db)
- Gas type of protection: Ex db IIC T6/T5 Gb
- Dust type of protection: Ex tb IIIC T85°C/T100°C Db
- Ambient temperature: -20°C /+60°C (T6) and -20°C /+85°C (T5)