Gefran MELT PRESSURE SENSORS General Product Line Information

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ENG

SENSORS

MELT PRESSURE

SENSORS

COD. 81201F

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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

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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

K W M

IMPACT

NaK

FDA oil

mercury*

2.5 mV/V

non-ampliﬁed output

3.33 mV/V

non-ampliﬁed output

4-20mA current output

0-10V voltage output

CAN-BUS DP404

digital output

output: GAUGE

Analogue indication

output: GAUGE

Digital indication

Atex with Intrinsic

Safety

rigid stem

ﬂexible sheath

ﬂexible sheath with

thermocouple

exposed tip

* M series (mercury ﬁlled) is available only where permitted by the European Directive 2011/65/UE – RoHS II)

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WHY GEFRAN

CERTIFICATIONS

MERCURY FREE

Sensitive to environmental issues, and in full harmony with the RoHS Directive, GEFRAN offers a 'wide range of sensors Melt

pressure mercury-free, both by ﬁlling ﬂuid - oil (FDA approved) or NaK (GRAS substance) - that

SOLUTIONS

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

AUTOZERO FUNCTION

All Gefran ampliﬁed Melt pressure sensors (M/W/K/I series) have the Autozero functions, which eliminates signal variations linked to a thermal effect, before putting the system under pressure.

AUTOCOMPENSATION

With the SP option (internal autocompensation), M/W/K series transmitters cancel the effect of variation of pressure signal

caused by variation of Melt temperature. In this way, the read error caused by heating of the ﬁlling ﬂuid (typical in ﬁlled sensors) is reduced to a minimum. In IMPACT, technology, digital electronics automatically compensate for drift due to thermal effect.

ATEX

MX/HMX, WX/HWX and IX (Atex) GEFRAN transmitters 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, IMPACT PL'c',

to the safety requisites of the recent Machinery Directive 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.

Even the full range of MELT pressure transmitters with ﬁlling ﬂuids (e.g. sodium-potassium) is available in Performance Level ‘c’ version. The beneﬁts are tangible and immediate: higher safety levels for machineries (i.e. conformity with the Machinery Directive and with the standard for extruders’ safety) and less risk for operators above all.

GTP+

• • • • • • •

Autozero

Autocompensation

ATEX

Mercury Free

Fluid Free

IMPACT

• • • • • • •

NaK

• • • • • • • •

Oil

Mercury

* M series (mercury ﬁlled) is available only where permitted by the European Directive 2011/65/UE – RoHS II)

• • • • • • •

Performance

Level 'c'

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MAX

315°C

350°C

400°C

538°C

* M series (mercury ﬁlled) is available only where permitted by the European Directive 2011/65/UE – RoHS II)

FILLING FLUID ENVIRONMENT OUTPUT GEFRAN SERIES

mV/V Current

Safe area

Diathermic oil

Atex area (EU)

Safe area

Mercury*

Atex area (EU)

Sodium-Potassium Safe area

Fluid free

Mercury*

Sodium-Potassium Safe area

Fluid free

Mercury*

Sodium-Potassium Safe area

Safe area

Atex area (EU) Current

Safe area

Atex area (EU)

Safe area

Atex area (EU) Current

Safe area

Atex area (EU)

Voltage CANopen HART (current) Local display

Current

HART (current)

mV/V Current Voltage CANopen HART (current)

Local display

Current

HART (current)

mV/V Current Voltage CANopen HART (current) mV/V Current

Voltage

mV/V Current Voltage CANopen HART (current)

Local display

Current

HART (current)

mV/V Current Voltage CANopen HART (current) mV/V Current

Voltage

mV/V Current Voltage CANopen HART (current)

Local display

Current

HART (current)

mV/V Current Voltage CANopen HART (current) mV/V Current Voltage CANopen HART (current)

W3 WE, WE PL'c' WN, W7 PL'c' WD HWE, HWE PL'c' W6 WX WX4 HWX, HWX PL'c' HWX4, HWX4 PL 'c' M3 ME, ME PL'c' MN, M7 PL'c' MD HME, HME PL'c' M5 M6 MX MX4 HMX, HMX PL'c' HMX4, HMX4 PL'c' K3 KE, KE PL'c' KN, K7 PL'c' KD HKE, HKE PL'c' I3 IE, IE PL'c' IN I7 PL'c' IX M3 ME, ME PL'c' MN, M7 PL'c' MD HME, HME PL'c' M5 M6 MX MX4 HMX, HMX PL'c' HMX4, HMX4 PL'c' K3 KE, KE PL'c' KN, K7 PL'c' KD HKE, HKE PL'c' I3 IE, IE PL'c' IN I7 PL'c' IX M3 ME, ME PL'c' MN, M7 PL'c' MD HME, HME PL'c' M5 M6 MX MX4 HMX, HMX PL'c' HMX4, HMX4 PL'c' K3 KE, KE PL'c' KN, K7 PL'c' KD HKE, HKE PL'c' K3 KE, KE PL'c' KN, KN PL'c' KD HKE, HKE PL'c'

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ACCESSORIES

RUPTURE-GRD DISCS

The rupture disc (also known as a bursting disc), is a mechanical device that fails at a predetermined pressure. Installed on the extruder, it prevents dangerous and sudden pressure increases in the machine and releases pressure by rupturing. ±0.5% accuracy and a wide pressure range make the GRD a valid addition to traditional control devices, especially in emergency conditions where immediate intervention is required.

TRANSDUCER SIMULATOR

The TS3 simulates the output of a Gefran mV/V melt pressure transducer (M3, W3, K3 series) at various pressure levels. It also simulates any strain-gauge transducer, and is available in a 6 pin (TS36) or 8 pin (TS38) version.

EXTENSION CABLES

6 and 8-pin extension cables with length up to 30 metres, for non-ampliﬁed and digital output.

GENERAL ACCESSORIES

Drill kit Cleaning kit Brackets Rupture discs

6-pin female connector 5-pin female connector 8-pin female connector

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Gefran MELT PRESSURE SENSORS General Product Line Information

Specifications and Main Features

Frequently Asked Questions

User Manual