1� General Information; 2� Acronyms - gefran HMF Series Instruction Manual

This manual applies to the following products:
HMF and HWF series produced by Gefran spa, via sebina 74 – 25050 Provaglio di Iseo - BS - Italy.
1.1 General information
This manual must be kept near the equipment for easy reading and consultation.
It must be read, understood, and strictly follow in order to avoid and prevent accidents and/or malfunctions.
Gefran will not be liable for any injury to people and/or damage to property deriving from disregard of this
manual.
1.2 Copyright
Any reproduction of this document, even partial or for internal use, requires Gefran's approval.
1.3 Correct use
Gefran Melt pressure sensors with amplified current output with HART protocol are designed and built
to measure the pressure and temperature variable of melted plastic at different temperatures according
to the filling fluid used. The correct temperature range is:
• Up to 315°C for HW series (i.e. oil filling fluid)
• Up to 400°C for HM series (i.e. mercury filling fluid)
If the sensors are used as a safety component in compliance with the Machinery Directive, it's necessary
to read carefully the "Safety Manual" (chapter 10).
In case the sensors are used for applications in potentially explosive atmospheres, please read carefully
(chapter 11).
Installation and maintenance must only be carried out by suitably skilled and qualified personnel.
The following acronyms are frequently used:
BFSL Best Fit Straight Line
DD Device Descriptor
EEPROM Electrically Erasable Programmable Read Only Memory
FS Full Scale Output
HART Highway Addressable Remote Transducer
LRV Lower Range Value
PT Pressure Transmitter
PV Primary Variable (Pressure)
RTD Resistance Temperature Detector (A very accurate temperature sensor)
SV Secondary Variable (Electronics Temperature)
TV Tertiary Variable (Snout Temperature)
URV Upper Range Value
Watchdog An internal timing control for the electronics
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1� General Information
2� Acronyms
80636B_MAN_HMF - HWF_05-2022_ENG