THERMOCOUPLES, RESISTANCE THERMOMETERS AND THERMOWELLS

More than fifty years of experience, an organisation with a strong focus on the customer’s needs and constant technological innovation have made Gefran a benchmark in the design and production of sensors, systems and components for industrial process automation and control. Expertise, flexibility and process quality are the factors that distinguish Gefran in the production of integrated tools and systems for specific applications in various fields of industry, with consolidated know-how in the plastics, mobile hydraulics, heating and lift sectors. Technology, innovation and versatility represent...

PRESENTATION EXPERIENCE Gefran has been designing and manufacturing its own thermocouples and thermistors for over 35 years, covering a wide temperature range (-200 ÷ +2000 C) in all application sectors. The experience gained by the technical and production staff, thanks to more than 5000 special versions produced in the last 10 years alone, makes Gefran the ideal partner for the production of customised probes and those using special materials. QUALITY All Gefran thermocouples and thermistors are made in Italy, in the Provaglio d’Iseo plant in the province of Brescia, in thermally controlled...

THERMOCOUPLES - THERMISTORS APPLICATION SECTORS INDUSTRIAL FURNACES CLIMATE CELLS FOOD AND CANNING INDUSTRY INJECTION-EXTRUSION BLOW MOULDING PROCESSES FOR ALUMINIUM, CERAMICS, HEAT TREATMENTS METALLURGICAL INDUSTRY HEAT PROCESSING MEDICAL / LABORATORIES GLASS PRODUCTION

BEYOND TECHNOLOGY Thermoelectric thermometers, commonly referred to as thermocouples (TC), consist of two metal conductors made of different materials which, toer temperature, generate a fem electromotive force. The principle behind thermocouples is Seebeck's thermoelectric effect, who discovered that, in a circuit formed by two different metal conductors A and B, when the two junctions are at different temperatures T1 and T2, a current I circulates in the circuit, produced by an electromotive force, the magnitude of which is directly proportional to the temperature difference between the two...

THERMOCOUPLES - THERMISTORS Gefran thermocouple model TC9/AC9 and TC10 for use at high temperatures (e.g. heat treatment furnaces) or for direct immersion (e.g. aluminium casting furnaces).

OPERATING PRINCIPLES METAL RESISTANCE THERMOMETERS (THERMISTORS) Metal resistance thermometers, commonly referred to as TR thermistors, are based on the principle that the resistance R of a metal conductor depends on the relationship. R = conductor resistance A = conductor area l = conductor length ρ = conductor resistivity As the temperature varies, the resistance of the conductor Rt varies, which, with respect to the initial resistance Ro, can be formulated using the following relatione: Rt = Ro*(1+αt): WHERE Rt = resistance at temperature t °C Ro = resistance at temperature 0 °C α = temperature...

THERMOCOUPLES - THERMISTORS HOW TO SELECT THE MOST SUITABLE SENSOR The choice of a temperature sensor must be made on the basis of several variables, including: • Characteristics of the application (temperature range, pressure range, process fluid, explosive environment, need to use anti-corrosive materials, etc.). • Dimensional characteristics (outer diameter of the protective sheath, material of the protective sheath, immersion length, process connection, type of cold junction, etc.) • Precision class: • Sensor feedback time The following is a useful diagram for the initial choice between a...

BEYOND TECHNOLOGY

BEYOND TECHNOLOGY

BEYOND TECHNOLOGY

BEYOND TECHNOLOGY

BEYOND TECHNOLOGY

THERMOWELLS MAIN TECHNICAL CHARACTERISTICS Flanged cylindrical bar thermowell Flanged cylindrical pipe thermowell EXTERNAL DIMENSIONS Diameter Min/max INTERNAL HOLE DIMENSIONS diameter PROBE COUPLING PROCESS COUPLING Stainless steel AISI 300 series INCONEL 600 Stainless steel AISI 300 series INCONEL 601 Stainless steel AISI 300 series ASTM A105 Stainless steel AISI 300 series ASTM A105 Stainless steel AISI 300 series INCONEL 600 ACCURACY CLASS FOR THERMOCOUPLES (RIF. IEC 584-2) MAIN TECHNICAL CHARACTERISTICS TYPE TOLLERANCE CLASS 1 Tolerance temperature range Tolerance temperature range TOLLERANCE...

BEYOND TECHNOLOGY IN STAINLESS STEEL AND BRASS SIGNAL AMPLIFIERS 4*20MA COMPRESSION FITTINGS AND FOR PT100 THERMISTOR PC PROGRAMMABLE ELECTRICAL CONNECTION SIGNAL AMPLIFIER HEADS

THERMOCOUPLES - THERMISTORS STANDARD COMPENSATED MIGNON COMPENSATED