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

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 specializes in pressure sensors for hydrogen applications, crucial for the hydrogen economy. They focus on measurement solutions for hydrogens challenges. Kellers technology supports the transition to cleaner energy.

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