Gefran - the Italian multinational group specialised in the design and production of sensors, industrial process control systems, electric drives and automation components - upgraded its range of
Melt transducers and pressure transmitters for high temperatures, designed to meet the highest safety standards, while fully respecting the environment.
There are two
main manufacturing technologies at the base of the
Melt sensors by
Gefran: these can be either fluid-free, following a silicon piezoresistive operating principle (
IMPACT – I Series sensors), or work by means of
filling fluids through a strain gauge system (
K, W, M Series). These sensors, available in
4 designs - rigid stem, flexible stem, flexible with thermocouple, and exposed tip, - guarantee a precise installation whenever it is necessary to measure the pressure and possibly the temperature of the fluid, both in traditional extrusion systems and in potentially explosive areas.
In this scenario,
Gefran was the first Company to design a sensor with
ATEX, SIL2 & PLd, certifications, as well as a
HART digital communication protocol, dedicated mechanical flanges, and a fluid-free transmission system. This is the
HIX Series (HART - IMPACT - ATEX), designed for use in potentially explosive environments and with the typical advantages of the
IMPACT sensors by
Gefran. More specifically, thanks to a contact membrane up to 15 times thicker than the traditional versions, the pressure is transmitted directly to the sensitive element, which features a micro-worked silicon structure (MEMS). The
HIX series, with a current output signal, withstands temperatures of up to 350°C and covers a pressure range from 0...10 bar to 0...1.000 bar, making it the ideal choice for the extrusion of low-viscosity plastics. Another advantage of this solution is the quick installation, thanks to the ready-to-use flanges offered by
Gefran.
There are also additional models with a construction principle based on the hydraulic transmission of pressure and on the transfer of mechanical stress through filling liquids with a low coefficient of compressibility. More in detail, the
K series is characterised by a mixture of Sodium + Potassium (NaK) which allows the sensor to withstand up to 538°C.
The W
series is characterised by an FDA-approved diathermic oil
filling, which is typically used in the production of plastics for medical or food products. Finally, the M
series uses mercury as a transmission fluid and it is employed in all circumstances approved by European Directive 2011/65/UE - RoHS II, in environments with temperatures of up to 400°C.
The full range of
Melt pressure transmitters comes in a SIL2 & Pld certified version. Furthermore, the
K, W, M models can also be equipped with a
HART serial communication (
HKE,
HWE,
HME models), while models HW
X, HM
X - which are
ATEX EXia certified - are particularly suitable for polymer production plants in potentially explosive environments. Finally, the broad range of
Gefran Melt sensors also includes digital output series
IO-Link, 1.1.3 version, which make the
Gefran offer unique on the market.
Edoardo Zilioli, Product Marketing Manager – Sensors at Gefran stated: “This is an extremely high-performing range developed by our R&D Team, that introduced the innovative
GTP+ coating: a guarantee of greater hardness, considerable resistance to high temperatures and a low coefficient of friction, bringing to an
increased durability for all sensors”. He then concluded: “
Melt sensors are fundamental to prevent an uncontrolled increase in machine pressure during extrusion processes. They contribute to the reliability and repeatability of processes thanks to the ability to stabilise and optimise the flow rate, hence creating products of superior quality”.
Gefran Gefran is the Italian multinational group specialised in the design and production of sensors, industrial process control systems, electric drives and automation components. Competence, flexibility and process quality are the distinguishing factors of Gefran in the realization of tools and integrated systems for specific applications in different industrial fields, with a consolidated know-how in the fields of plastic, metal, paper, industrial lifting, heat treatment and lift. Technology, innovation and versatility represent the added value of the catalogue: electrical drives, sensors, automation platforms, regulators and power controllers able to increase the efficiency of production processes, also in terms of energy. The company now has over 900 employees, of which almost 500 in Italy (in the main offices of Provaglio di Iseo and Gerenzano) and consolidated collaborations with national and international research centers and universities. Gefran operates on the main international markets through 6 production subsidiaries in Brazil, China, Germany, India, Switzerland and the United States. In addition, there are sales subsidiaries in France, the United Kingdom, Belgium, India, Singapore, Turkey and over 80 international distributors for global sales support. Gefran is listed on the Milan Stock Exchange in the FTSE Italia STAR segment. For more information: www.gefran.com