Strain gauge pressure transmitter HME

HART1/2" UNFM18 x 1,5

Product overview
The Gefran HME series are mercury-filled melt pressure transmitters designed for high-temperature melt pressure measurement. They feature HART communication, support media temperatures up to 400°C and are intended for large fixed industrial installations (e.g. extruders) and laboratory B2B R&D equipment.

Main features

• Mercury-filled hydraulic transmission; HART communication; safety levels SIL2 and PLd (model dependent)
• Pressure ranges: 0–17 to 0–2000 bar (0–250 to 0–30000 psi)
• Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
• Media temperature capability up to 400°C

Functional and mechanical details

• Measurement principle: hydraulic transmission to a diaphragm and strain-gauge (bridge) conversion to electrical signal
• Standard threads: 1/2-20 UNF, M18x1.5 (others on request)
• Mercury fill volumes: HME0 = 30 mm³; HME1/HME2/HME3 = 40 mm³
• Standard diaphragm: 15-5 PH stainless steel with GTP+ coating; optional 17-7 PH corrugated diaphragm for ranges below 100 bar
• Autozero: onboard or external option

Applications
Designed for melt pressure measurement in high-temperature polymer processing (extrusion) and for fixed industrial installations and laboratory R&D where temperature stability and accurate melt pressure readings are required.

Technical specifications

• Model: HME (Gefran)
• Communication: HART protocol
• Pressure ranges: 0–17 … 0–2000 bar (0–250 … 0–30000 psi)
• Accuracy classes: H (< ±0.25% FS), M (< ±0.5% FS)
• Filling: mercury (volumes by variant)
• Diaphragms: 15-5 PH (standard) or 17-7 PH corrugated (for low ranges), GTP+ coating
• Threads: 1/2-20 UNF, M18x1.5 (others on request)
• Autozero: onboard or external
• Measurement technology: strain-gauge
• Designed use: large fixed installations (extruders) and laboratory B2B R&D equipment
• Safety/performance: SIL2, PLd (model dependent)