Strain gauge pressure transducer CSP-E

analog4-20 mAcurrent output

Subtitle
High-temperature pressure transducer with 4-20 mA output for melt applications

Overview
The Gefran CSP-E series melt pressure transducers are engineered for pressure measurement in high-temperature processes up to 600 °C (1112 °F). The design uses hydraulic pressure transmission via an incompressible NaK (sodium/potassium) alloy to convey process pressure to the sensing element. Thick-film strain gauge technology converts the mechanical stress into an electrical 4-20 mA output. The CSP-E is intended for CSP (Concentrated Solar Power), TES (Thermal Energy Storage) and other high-temperature melt installations where thermal drift compensation is required.

Main features

• Designed for CSP and high-temperature melt applications
• Analog output: 4-20 mA
• Pressure ranges: 0–20 to 0–1000 bar (0–300 to 0–15000 psi)
• Maximum process temperature: 600 °C (1112 °F)

Construction and principle

• Hydraulic pressure transmission: process pressure is transferred through an incompressible NaK fluid to the sensing element, ensuring measurement stability at very high temperatures.
• Sensing element: thick-film strain gauge converts pressure-induced mechanical stress into an electrical signal.
• Materials selected for high-temperature and corrosion resistance: stem in 17-4 PH, corrugated diaphragm in Inconel 718 with GTP+ coating.
• Flanged process connection suitable for melt/high-temperature installations.

Functions and options

• On-board Autozero function (external Autozero version available)
• Signal drift compensation possible via K coefficient to correct temperature-related variations

Applications

• Concentrated Solar Power (CSP) plants
• Thermal Energy Storage (TES) systems
• High-temperature melt process monitoring and control

Technical specifications

• Pressure ranges: 0–20 to 0–1000 bar (0–300 to 0–15000 psi)
• Maximum process temperature: 600 °C (1112 °F)
• Output: 4-20 mA analog
• Accuracy: < ±1% FS (L)
• Hydraulic transmission fluid: NaK (sodium/potassium alloy), RoHS compliant
• Stem material: 17-4 PH
• Corrugated diaphragm: Inconel 718 with GTP+ coating
• Process connection: flanged
• Autozero: on-board (optional external version)
• Thermal drift compensation via K coefficient