Fast, Simple, and Low-Cost Hydrogen Measurement
General H2O electrolysis process
Measuring hydrogen concentration in a typical H2O electrolysis process has the following challenges:
(1) Conventional thermal conductivity meters and alloy thin film meters; Slow response, tens of seconds to 60 seconds
(2) The anode side need to multiple pretreatments for water separation and dehumidification.
In H2O electrolysis plants that produce hydrogen, cross-leakage to the anode and cathode sides due to membrane degradation is an issue for safety management, and the inability to achieve a fast response in general hydrogen concentration measurement is a major issue for safety monitoring.
Since the gas components of the H2O electrolysis process are hydrogen and oxygen, it is possible to estimate the gas concentration by gas density. The applicability of gas density meters in hydrogen concentration measurement is introduced in this document.
Fig. 3 Schematic diagram of hydrogen measurement
Advantages of Using a Gas Density Meter for Hydrogen Measurement
Not only the analyzer's fast response but also pre-processing can be simplified, achieving overall fast response
- Simplified Plant Design
simple pre-processing contributes to the simplification plant design - Fast Response
The gas density meter is faster than conventional ones
Product Details
GD80
Gas Density Meter Detector
GD802G
Gas Density Meter Converter
Principle
Two pairs of piezoelectric elements for drive and detection are attached on four points of a thin-wall cylindrical resonator. A platinum temperature sensor is mounted to the density sensor.
The sample gas from inlet passes over the outside of the thin-walled cylindrical resonator and is exhausted at the gas outlet.
Fig. 4 Detector structure
Gas Density Meter Specifications
| Sample Gas Conditions | -Sample Gas: All gases except for corrosive gases (Contact Yokogawa for details.) -Temperature: -10 to 60℃ (No condensation) -Flow Rate: 0.1 to 1 L/min -Pressure: 50 kPa to 600 kPa abs. |
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|---|---|---|
| Principle | Multi-mode oscillation technology | |
| Performance Specification | -Range: Concentration: 0 to 100 vol% -Minimum Range: Equivalent to 0.100 kg/m³ density -90% Response Time: Approx. 5 s (Time required for the reading to reach 90% of its final value after the indicated value begins to change (at a gas flow rate of 0.6 L/min)). -Linearity: ± 1% -Repeatability: ±0.5% or concentration equivalent to ±0.001 kg/m³ density (Whichever is greater. ) -Zero / Span Drift: Equivalent to ±0.003 kg/m³ density/month (Provided that the detector, converter, and pressure transmitter are not affected by ambient temperature.) |
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