Strain gauge pressure transmitter HWX

4-20 mAHART8 pin M12 connector

Product overview
HWX is a pressure transmitter from Gefran s.p.a. engineered for melt and high-temperature industrial processes. It uses a fluid-filled hydraulic transmission to transfer media pressure to a strain-gauge sensing element and supports HART communication. The design enables reliable pressure measurement where the medium temperature can reach up to 315 °C.

Main features

• Pressure ranges: configurable from 0–35 to 0–1000 bar (0–500 to 0–15000 psi equivalents)
• Accuracy classes: < ±0.25% FS (H) or < ±0.5% FS (M)
• Fluid-filled system (oil) for temperature stability — volumes: HWX0 = 30 mm³; HWX1/2/3 = 40 mm³
• Diaphragm: 17-7 PH corrugated with GTP+ coating
• Output/communication: 4…20 mA with HART (Smart HART) option

Applications

• Pressure measurement in melt processes and other high-temperature industrial applications
• Systems requiring FDA-compatible heat transfer fluids (diathermic oil)
• Installations in potentially explosive atmospheres with appropriate certifications

Technical specifications

• Model / commercial name: HWX
• Manufacturer: Gefran s.p.a.
• Fluid compatibility: diathermic oil (FDA)
• Temperature capability: media temperature reading up to 315 °C (dependent on execution)
• Standard mechanical connections: 1/2-20 UNF, M18x1.5 (other threads on request)
• Connector options: 6-pin, 8-pin, NPT cable outlet
• Mechanical variants: rigid rod, rigid+flexible, with thermocouple, exposed capillary, flange mounting
• Autozero: onboard or external option

Approvals & ordering

• Certifications / approvals: ATEX, IECEx, EAC, PAC, SIL2, PLd, KCs, NEPSI Ex, PESO (options depend on configuration)
• Typical ordering code structure: configurable codes for output, version, connector, accuracy, range, thread, rod length and options
• Custom executions and special approvals available on request