Is the dry contact certified according to SIL 1 or SIL 2?

No, it should only be used to shut down the electrolyser as a preliminary measure, before a real safety risk occurs. To realize a true safety shutdown, please use a certified safety circuit and simply cut off the power to

Januar 11, 2022

No, it should only be used to shut down the electrolyser as a preliminary measure, before a real safety risk occurs. To realize a true safety shutdown, please use a certified safety circuit and simply cut off the power to the electrolyser.

For example, in the case of a hydrogen leak, a H₂ safety sensor could ring an alarm and trigger the dry contact at a warning threshold of 10% of LEL to shut down the EL. If a safety threshold of 25% LEL is reached, it could trigger a certified safety circuit to cut the power to the entire system.