Strain gauge pressure transmitter HMX

4-20 mAHART1/2" UNF

Product overview
The HMX series by Gefran are pressure transmitters designed for melt/high-temperature pressure measurement (media temperatures up to 400 °C). They are intended for large fixed installations, stationary industrial equipment (e.g. extruders) and R&D laboratory tools. The instrument uses a fluid-filled hydraulic transmission to ensure temperature stability and a strain-gauge (Wheatstone bridge) sensor to convert pressure into an electrical signal. HART communication is available and multiple hazardous-area approvals can be supplied depending on configuration.

Main features

• Pressure ranges: 0-17 to 0-2000 bar (0-250 to 0-30000 psi)
• Measurement principle: strain-gauge (Wheatstone bridge)
• Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
• Internal calibration signal: 80% FS
• Ingress protection: IP65 (at connector)
• Process connections: 1/2-20 UNF, M18x1.5 (other threads on request)
• Standard diaphragm: 15-5 PH stainless steel with GTP+ coating; alternative 17-7 PH corrugated for ranges <100 bar
• Media temperature capability: up to 400 °C
• Construction: hydraulic, fluid-filled transmission for thermal stability
• Communication: HART protocol
• Certifications (options): ATEX, IECEx, EAC, PAC, SIL2, PLd, KCs, Nepsi Ex, PESO

Applications

• Melt pressure measurement in extrusion and polymer processing
• High-temperature industrial processes requiring pressure measurement and remote configuration/diagnostics via HART
• Fixed industrial installations, stationary tools and R&D laboratory equipment

Technical specifications

• Pressure ranges: 0-17 to 0-2000 bar (0-250 to 0-30000 psi)
• Measurement: strain-gauge (Wheatstone bridge)
• Output/communication: 4-20 mA with HART (depending on configuration)
• Accuracy classes: < ±0.25% FS (H); < ±0.5% FS (M)
• Calibration: internal 80% FS calibration signal
• Ingress protection: IP65 (connector)
• Process connections: 1/2-20 UNF, M18x1.5 (others on request)
• Diaphragm materials: 15-5 PH stainless steel with GTP+; 17-7 PH corrugated stainless steel for low-range versions
• Operating media temperature: up to 400 °C (depending on configuration)
• Construction principle: hydraulic fluid-filled transmission for temperature stability
• Approvals: ATEX, IECEx, EAC, PAC, SIL2, PLd, KCs, Nepsi Ex, PESO (availability depends on version)
• Typical uses: extruders, polymer melt pressure measurement, stationary industrial tools, R&D equipment