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Pressure Transmitters

H2 - Pressure Transmitter - Series 23SY

KELLER Pressure AG

  • Piezoresistive pressure transmitter for hydrogen applications
  • Gold-plated diaphragm for minimal H2 diffusion
  • Excellent long-term stability
  • Optional intrinsically safe version for explosive environments
  • Direct analog signal path with high bandwidth

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Description Vendor

The Series 23SY-H2 is a piezoresistive pressure transmitter specifically designed for hydrogen applications. It features a stainless steel housing with increased nickel content to reduce embrittlement, a gold-plated diaphragm that minimizes hydrogen diffusion, and is compensated over the entire temperature range for consistent performance. The transmitter offers excellent long-term stability and includes an optional intrinsically safe version, Series 23SY-Ei-H2, suitable for use in explosive environments. It is ideal for applications such as hydrogen manufacturing, transport, containment, and storage, with pressure ranges from 0...4 bar to 0...1000 bar. The device has high accuracy, with a total error band of ±0.25%FS at 0...50°C and ±0.7%FS at -10...80°C. It supports both 2-wire and 3-wire connectivity, with analog signal outputs of 4...20 mA or 0...10 V. The transmitter is available with various pressure connection options, including G1/4 Mano with centring pin, 1/4-18NPT male, and 7/16-20UNF 2B female. Its robust design includes a fully welded construction with no internal seals, ensuring reliability in harsh conditions. The product also meets electromagnetic compatibility standards and offers protection ratings of IP67 or IP65, depending on the plug type used.

Use Cases

  • Manufacturing / production
  • Transport
  • Containment / storage

Capabilities

  • Pressure measurement across full temperature range
  • Long-term stable output
  • Analog signal output (4…20 mA or 0…10 V)
  • Fully welded housing with no internal seals for hydrogen compatibility
KELLER Pressure AG KELLER Pressure AG, a Swiss company founded by Hannes W. Keller with over 40 years of experience in pressure measurement, has developed a dedicated hydrogen product line offering accurate, reliable pressure sensors specifically optimized for H2 applications, leveraging isolated piezoresistive pressure sensor technology invented by the company's founder. The company's hydrogen pressure instruments -- including the 23SX-H2 and 33X-Ei-H2 series relative pressure transmitters -- feature low embrittlement rates due to increased nickel content in the stainless steel used, combined with gold-plated diaphragms that reduce hydrogen diffusion to a minimum (as hydrogen can hardly penetrate the gold layer), all built as fully welded sensors without internal seals for maximum reliability across typical hydrogen application pressure ranges of 0-2 bar to 0-1000 bar. KELLER's hydrogen sensor portfolio is compatible with the EC79 standard for automotive applications, with the LEO-Record-H2 and intrinsically safe LEO-Record-Ei-H2 digital pressure gauges providing long service life and high accuracy for hydrogen generation and production, transportation, hydrogen refueling station monitoring, and hydrogen containment/storage applications, connectable via RS485 interface for configuration and data logging. Serving customers including hydrogen-powered racing applications and off-grid hydrogen fuel/generator managed service providers like Hydrologiq, KELLER Pressure continues exhibiting its 'Swiss Made' precision pressure sensor technology at major hydrogen industry trade shows, positioning the company's decades of piezoresistive measurement expertise to serve the growing hydrogen mobility, production, and storage infrastructure market.
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