Alkaline electrolyser (AEL)
Level and pressure measurement in the alkaline electrolyser
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Process data
Measuring task:
Level measurement
Measuring point:
Tank
Measuring range up to:
2 m
Medium:
Potassium hydroxide solution overlaid with hydrogen or oxygen gas
Process temperature:
0 … +90 °C
Process pressure:
0 … +1 bar
Special challenges:
Aggressive medium, hydrogen diffusion, suitability for oxygen
Application
In the electrolyser, renewable energy is used to split water (H2O) into its individual components hydrogen (H) and oxygen (O). Green hydrogen is thus produced in a CO2-free cycle. In the alkaline electrolyser, potash lye acts as the electrolyte, which is not consumed in the process. Oxygen is produced as a by-product. Level measurement is used to regulate both the concentration of electrolyte and the inflow of water. Highly resistant pressure sensors are used to monitor the overpressure in the two electrolyte tanks, as well as the differential pressure between the two tanks.
Your benefit
Reliable
Reliable measurement resistant to highly-corrosive potash lye
Cost effective
Precise level and pressure measurement for efficient output regulation
User friendly
Direct installation in the tank or in a bypass tube
Recommended products
VEGAFLEX 83
Level measurement with guided radar for regulating the electrolyte level and the water intake
- Reliable measurement, even with small measuring ranges
- High resistance to aggressive potash lye
- Sensor version for high-purity oxygen applications (EIGA 33/18 and ASTM G93) also available
Measuring range - Distance
32 m
Process temperature
-40 ... 150 °C
Process pressure
-1 ... 16 bar
VEGABAR 82
Pressure sensor for pressure monitoring in an electrolyte tank
- Long-term stability on pressure measurement up to 100 bar
- Highly resistant process fittings of PVDF or PEEK
- Reliable pressure monitoring via oil-free ceramic measuring cell
Measuring range - Distance
-
Measuring range - Pressure
-1 ... 100 bar
Process temperature
-40 ... 150 °C
VEGADIF 85
Differential pressure measurement between the two electrolyte tanks
- Suitable for oxygen and hydrogen
- Optional gold coating of the diaphragm reduces diffusion
- Output of differential as well as static pressure through a second current output
Measuring range - Pressure
-40 ... 40 bar
Process temperature
-90 ... 400 °C
Process pressure
-1 ... 400 bar
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