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HWF
Hart Oil Filled Melt Pressure Transducer
HWF P
Hart Oil Filled Melt Pressure Transducer PL d Certified
HWF S
Hart Oil Filled Melt Pressure Transducer SIL 2 Certifed
HMF
Hart Mercury Filled Melt Pressure Transducer
HMF P
Hart Mercury Filled Melt Pressure Transducer PL d Certified
HMF S
Hart Mercury Filled Melt Pressure Transducer SIL 2 Certifed
Gefran Melt sensors are pressure/temperature transmitters designed for use in high temperature envi-
ronments. They read media pressure up to a temperature of 400°C, and resist such high temperatures thanks
to their special mechanical construction, in which the measurement element is isolated from the Melt.
The constructive principle is based on hydraulic transmission of pressure; mechanical strain is transferred by
means of a non-compressible transmission liquid.
The liquid used in these sensors may be mercury (i.e. HM series) or FDA-approved oil (i.e. HW series). Strain
gauge technology translates the physical quantity (pressure) into an electrical signal.
Five different designs are available: rigid rod, flexible sheathing, flexible plus thermocouple, exposed tip and
flange mount. Gefran Melt sensors satisfy all installation and field requirements.
The sensors can read an extremely wide range of pressures: from a version with minimum range of 0-17 bar
up to a version with a scale of 0-1000 bar.
All models in the catalog can be supplied in two different classes of accuracy: class M, with accuracy of 0.5%
FS, and class H, with accuracy of 0.25% FS. For all the other details and technical features please keep as
reference the product datasheets or Gefran website www.gefran.com.
Performance Level 'd' or SIL2 certified versions are available.
Factory Mutual approved versions are available: rigid rod (0), flexible sheating (1), exposed tip (3), flange
mount (4). FM approved option 2 (flexible plus thermocouple) is not available. Please refer to datasheet for
explanation of configurations.
80636B_MAN_HMF - HWF_05-2022_ENG
3� Name coding
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