Hydrogen Electrolysis: Flow and Pressure Guide

1. Process conditions change quickly and pressure is difficult to hold steady.

• Custom sized valves on back pressure controllers provides the steadiest of control, given process conditions.
• PID tuning gives users in-field precision control on how fast a setpoint is reached as well as control stability. 

2. Wet gases corrode instrumentation.

• Anti-corrosive pressure controllers resist corrosion, even when exposed to high humidity. 

3. Hot gases degrade electronics in electronic back pressure controllers.

• High temperature builds include modifications to the electronics and temperature compensation for device longevity and top performance between 60°C and 100°C. Remote displays protect electronics while providing quick monitoring and system service.

4. Extremely high temperatures and pressures and highly corrosive gases require industrial-grade instruments.

• A multi-orifice back pressure regulator piloted by a dual valve pressure controller regulates electrolyser system pressure over a wide range (10,000:1 turndown) while remaining unaffected by moisture.

1. Pressures or flow rates oscillate through production cycle.

• Mass flow meters with integrated totalizers and flow averaging provide easy monitoring and remove guesswork. 

2. Wet gases (or a failed dehumidifier) corrode instrumentation.

• Anti-corrosive mass flow meters provide long-term resistance to corrosion.
• Placing the mass flow meter in a warm water bath helps avoid water vapor condensing within the mass flow meter.
• Differential-pressure-based mass flow instruments must only be cleaned when exposed to water, compared to thermal mass flow instruments that must be replaced. 

3. Humidity changes, affecting mass flow readings.

• Relative humidity compensation on mass flow meter offers additional accuracy, even when humidity levels change. RH sensors can be integrated into Alicat mass flow meters, or data from a remote sensors can be reported data digitally. 

4. Hot gases degrade electronics in digital mass flow meters.

• A high temperature build option includes modifications to the electronics and temperature compensation for device longevity and top performance between 60°C and 100°C.
• Remote displays protect electronics, but still allow quick monitoring and system service.

1. Flow rates are low, but precision is essential.

• Coriolis mass flow technology is compatible with liquids, and measures flow rates as low as 0.08 g/h, while maintaining an incredibly high accuracy (±0.2% of reading or ±0.05% of full scale).