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Pressure Transmitters

Series 23SX-H2 - Pressure Transmitter

KELLER Pressure AG

  • High-precision piezoresistive pressure transmitter for hydrogen applications
  • Excellent long-term stability
  • Optional intrinsically safe version for explosive environments
  • High-quality pressure transducers and proven mathematical compensation
  • Stainless steel/gold-plated diaphragm

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Description Vendor

The Series 23SX-H2 is a high-precision piezoresistive pressure transmitter specifically designed for hydrogen applications. It features a stainless steel diaphragm with increased nickel content to minimize embrittlement, and a gold-plated diaphragm to ensure minimal hydrogen diffusion. The transmitter includes an RS485 interface that can be combined with an analog interface, offering scalability through the turn-down feature. It supports Modbus RTU protocol for process values and configuration, and provides excellent long-term stability. An optional intrinsically safe version, 33X-Ei-H2, is available for use in explosive environments. The device is based on the well-known 33X series and offers high accuracy with a total error band of ±0.25%FS at temperatures ranging from -10 to 80°C. It is suitable for a wide range of pressure applications, from 0...4 to 0...1000 bar, and is commonly used in manufacturing, transport, containment, and petrol station environments. The transmitter has various connectivity options, including 2-wire and 3-wire analog interfaces, and digital RS485 interfaces. It also supports different power supply ranges and has features like overvoltage protection, reverse polarity protection, and IP67/IP65 protection ratings depending on the plug type. The device is designed with a fully welded construction and no internal seals, ensuring durability and reliability in harsh conditions.

Use Cases

  • Manufacturing / production
  • Transport
  • Containment / storage

Capabilities

  • High-precision pressure measurement (±0.1% FS)
  • Analog and RS485 digital interface support
  • Modbus RTU protocol for data/configuration
  • Fully welded design with no internal seals for hydrogen durability
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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