Melt Pressure Transducers, Sensors, Transmitters

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Melt Pressure Transducers and Transmitters

Melt Pressure Transducers and Transmitters

Gefran Fuid Free | Sodium-Potassium- | Oil- & Mercury filled transducers

GEFRAN Melt sensors are pressure/ temperature transducers and transmitters that measure Melt medium pressure in high temperature environments (up to 538°C).

Melt pressure can be measured in four main process temperature ranges:

Pressure Measurement at high temperatures

 

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Extensimetric Technology
with filling fluid

Gefran's Extensimetric Technology

 

The operating principle is based on hydraulic transmission
of pressure by means of filling fluids with low coefficient
of compressibility:
mercury (M series), FDA-approved
diathermic oil (W series), and sodium-potassium NaK mix (K
series), defined as a substance Generally Recognized As Safe
(GRAS).

Therefore, the entire structure is built to transfer the
pressure exerted by the medium on the contact diaphragm
to the transduction part, i.e., measurement diaphragm with
the strain gauge, keeping it away from the heat source.
The strain gauge then transduces the physical pressure
quantity into an electrical signal.

Piezoresistive Technology
entirely fluid free

Gefran's Piezoresistive Technology

 

Innovative IMPACT sensors (I series) are pressure transmitters
without transmission fluid: medium pressure is transferred
directly to the silicon sensitive element by means of a thick
diaphragm.

Physical stress is transduced by a Wheatstone bridge with 4
piezoresistors.

Gefran's IMPACT series, with proprietary technology, provides:

  • High strength (up to 35 times stronger than traditional sensors)
  • High response speed
  • Extremely easy installation thanks to a modular sensor
  • High safety standards (conformity to Machinery Directives

4 different Designs
 

Designs of melt Pressure Transducers

 


Gefran high-temperature pressure transducers are generally
available in four versions:

  • Rigid Stem
  • Flexible Sheath
  • Flexible
    with Thermocouple
  • Exposed Tip
    (except for the IMPACT
    series).

Selection Guide

Please click on the Gefran series of suitable transducers to find more info & request a quote.

Tmax Filling fluid Environment Output Series
315°C Diathermic Oil Safe area mV/V Gefran W3
Current Gefran WE
Voltage Gefran WN
CANopen Gefran WD
Local display Gefran W6
Mercury Safe area mV/V Gefran M3
Current Gefran ME
Voltage Gefran MN
CANopen Gefran MD
Local display Gefran M5
Gefran M6
Atex area (EU) Current Gefran MX
Hazardous area (USA) Gefran MX4
Sodium-Potassium Safe area mV/V Gefran K3
Current Gefran KE
Voltage Gefran KN
CANopen Gefran KD
Fluid free Safe area mV/V Gefran I3
Current Gefran IE
Voltage Gefran IN
Gefran I7
Gefran IJ-N
CANopen Gefran IJ-D
Atex area (EU) Current Gefran IX
350°C Mercury Safe area mV/V Gefran M3
Current Gefran ME
Voltage Gefran MN
CANopen Gefran MD
Local display Gefran M5
Gefran M6
Atex area (EU) Current Gefran MX
Gefran MX4
Hazardous area (USA) Current Gefran WF
Sodium-Potassium Safe area mV/V Gefran K3
Current Gefran KE
Voltage Gefran KN
CANopen Gefran KD
Fluid free Safe area mV/V Gefran I3
Current Gefran IE
Voltage Gefran IN
Gefran I7
Gefran IJ-N
CANopen Gefran IJ-D
Atex area (EU) Current Gefran IX
400°C Mercury Safe area mV/V Gefran M3
Current Gefran ME
Voltage Gefran MN
CANopen Gefran MD
Local display Gefran M5
Gefran M6
Atex area (EU) Current Gefran MX
Gefran M4
Hazardous area (USA) Current Gefran W3
Sodium-Potassium Safe area mV/V Gefran K3
Current Gefran KE
Voltage Gefran KN
CANopen Gefran KD
538°C Sodium-Potassium Safe area mV/V Gefran K3
Current Gefran KE
Voltage Gefran KN
CANopen Gefran KD

Features

Melt Pressure Sensors: Features Table Mercury filled melt pressure transducers Oil-filled Melt Pressure Transducers Sodium-Potassium (NaK) filled Melt Pressure Transducers Fluid-free Melt Pressure Transducers
Please click on the sensor category above for more information.

Mercury-free solutions

Sensitive to environmental issues, and in full harmony with the RoHS Directive (2002/95/CE), GEFRAN offers a wide
range of mercury-free Melt sensors, both with filling fluid (oil or NaK) and fluid free (IMPACT).

GTP

The new GTP coating, the result of Gefran research, guarantees longer Melt sensor life thanks to:

  • Greater hardness
  • Resistance to high temperatures
  • Low coefficient of friction

Certifications

ATEX and Factory Mutual

Gefran MX, Gefran WX or Gefran IX (Atex) and Gefran MF or Gefran WF (Factory Mutual) transmitters and transducers are certified based on their respective protection and safety requisites, and can work in potentially explosive atmospheres.

Performance Level 'c' (PL'c' EN13849-1)

IMPACT is available in the IMPACT PL"c" version, conforming to the safety requisites of the recent Machinery Directive
2006/42/CE and EN1114 specific for extruders. IMPACT PL"c" features intelligent electronics with Auto Diagnostics to detect possible faults.

An integrated relay in the electronics changes state in case of overpressure or if the setpoint is exceeded.

Increased safety on the IMPACT PL"c" is completed by full conformity to Namur NE21 and NE43 recommendations.
 

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