Gefran MELT PRESSURE SENSORS General Product Line Information
ENG
SENSORS
MELT PRESSURE
SENSORS
COD. 81201F
EXTENSIMETRIC TECHNOLOGY
with filling fluid
The operating principle is based on hydraulic transmission of pressure by means of filling fluids with low coefficient
of compressibility: mercury (M series available only where permitted by the European Directive 2011/65/UE –
RoHS II), FDA-approved diathermic oil (W series), and sodium-potassium NaK mix (K series).
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
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 that traditional sensors)
- High response speed
- Extremely easy installation thanks to a modular sensor
- High safety standards (conformity to Machinery Directives and RoHS)
fluid free
PRESSURE MEASUREMENT AT HIGH TEMPERATURES
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:
> up to 315°C
> up to 350°C
> up to 400°C
> up to 538°C
22
APPLICATIONS
PLASTICS - EXTRUSION PLASTICS – INJECTION PLASTIC RECYCLING
CHEMICAL AND PHARMACEUTICALFOODENERGY
4 DIFFERENT DESIGNS
Gefran Melt pressure sensors are generally available in four versions: rigid stem, flexible sheath, flexible with
thermocouple, and exposed tip (except for the IMPACT series).
RIGID STEM FLEXIBLE SHEATH FLEXIBLE WITH THERMOCOUPLE EXPOSED TIP
H K E 2
HART protocol
H
I
K
W
M
IMPACT
NaK
FDA oil
mercury*
2.5 mV/V
2
non-amplified output
3.33 mV/V
3
non-amplified output
4-20mA current output
E
0-10V voltage output
N
CAN-BUS DP404
D
digital output
output: GAUGE
5
Analogue indication
output: GAUGE
6
Digital indication
Atex with Intrinsic
X
Safety
rigid stem
0
flexible sheath
1
flexible sheath with
2
thermocouple
exposed tip
3
* M series (mercury filled) is available only where permitted by the European Directive 2011/65/UE – RoHS II)
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