Silicon pressure transmitter ILI

MEMSpiezoresistiveIO-Link

Overview
The IMPACT Fluid Free ILI pressure transmitter by Gefran is a fluid‑free sensor designed for high‑temperature melt and other high‑temperature industrial processes (process contact capability up to ~350 °C). A thick process diaphragm transmits pressure directly to a MEMS silicon piezoresistive sensing element. The ILI version provides an IO‑Link digital output to deliver diagnostics and auxiliary process data for Industry 4.0 and predictive‑maintenance integration.

Main features

• Performance Level "d" (PLd) and SIL2 approvals available for functional safety
• Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
• Pressure ranges: 0–10 to 0–1000 bar (or 0–150 to 0–15000 psi)
• Standard process threads: 1/2-20 UNF and M18x1.5
• Rangeability: 3:1
• Autozero function available
• Process diaphragm: 15-5 PH stainless steel with GTP+ coating
• IO‑Link digital output; optional temperature reading over IO‑Link

Functional safety
Configurations compliant with PLd and SIL2 are available to support safety‑related installations. IO‑Link diagnostics help monitor device status and reduce risk of unplanned downtime in safety applications.

Applications

• Pressure measurement in high‑temperature melt processes (injection, extrusion) and other processes with diathermic oils or elevated process temperatures
• Industry 4.0 smart‑sensor use cases requiring IO‑Link diagnostics and auxiliary data
• Safety‑related process control requiring PLd/SIL2 certified sensors

Technical specifications

• Model family: ILI (IMPACT Fluid Free)
• Measuring principle: MEMS piezoresistive silicon sensing element
• Transmission fluid: none (fluid‑free design)
• Operating (process contact) capability: up to ~350 °C depending on configuration
• Accuracy classes: H (< ±0.25% FS), M (< ±0.5% FS)
• Pressure ranges: 0–10 to 0–1000 bar (psi equivalents available)
• Standard threads: 1/2-20 UNF, M18x1.5
• Rangeability: 3:1
• Functions: autozero, IO‑Link diagnostics, optional temperature reading via IO‑Link
• Diaphragm material/coating: 15-5 PH stainless steel, GTP+ coated