Relative pressure transmitter HWE

absolutestrain gauge4-20 mA

Overview
Gefran HWE series are pressure transmitters with HART communication protocol designed for high-temperature melt applications. The series reads media temperatures up to 315°C. Hydraulic transmission with a fluid-filled (oil) system ensures thermal stability while a strain-gauge converts pressure into an electrical signal.

Main features

• HART digital communication combined with 4…20 mA analog output
• Media temperature capability up to 315°C
• Fluid-filled (oil) hydraulic pressure transmission; oil complies with FDA CFR 178.3620 and CFR 172.878
• Pressure ranges: 0-35 to 0-1000 bar (0-500 to 0-15000 psi)
• Accuracy classes: < ±0.25% FS (H) and < ±0.5% FS (M)

Applications

• High-temperature melt processes (plastics extrusion, polymer processing) requiring stable pressure measurement
• Industrial processes where FDA-compliant filling fluid and high media temperatures are present

Technical specifications

• Series / model: HWE
• Measurement type: absolute or gauge; strain-gauge sensor (bridge)
• Oil fill volumes: HWE0 = 30 mm³; HWE1/HWE2/HWE3 = 40 mm³
• Diaphragm: 17-7 PH corrugated diaphragm with GTP+ coating
• Standard process threads: 1/2-20 UNF and M18x1.5 (other threads on request)
• Output: E = 4…20 mA with HART (typical configuration)
• Safety / performance options: SIL2 and Performance Level d (PLd), depending on configuration

Ordering & variants

• Typical versions: rigid rod; rigid + flexible rod; with thermocouple; exposed capillary
• Connector options: 6-pin, 8-pin, NPT cable
• Autozero: on-board magnetic or external autozero option
• Pressure and code examples, connector and length options available in datasheet and configurator