EMOS® SIL2 Safety system


The common cause of most cell room incidents is “hot” cell operation: the top of a membrane melts, the hydrogen and chlorine mix, and the cathode and anode are short circuited. Next, cells start to burn, and explosive gas mixtures ignite in the cell or further downstream in the chlorine production process.

“Hot” cell operation can be the result of an insufficient electrolyte flow to a single cell because of a blocked feed system, a high cell resistance caused by an abnormal coating aging, or a general failure.

Precise and Advanced Detection

We can perform advance detection of all known electrolyser malfunctions in real-time by precisely measuring and analyzing the voltage : current : time relationship of each individual cell.

Injury to personnel and irreversible damage to equipment can thus be prevented by triggering an emergency shutdown of the individual power supplies.

The EMOS® SIL2 SAFETY SYSTEM analyzes the voltage of each individual cell. The accepted voltage range is calculated in real-time based on the:

  • Rectifier current
  • Performance of neighbouring cells
  • Technology specific constraints
  • Electrochemical boundaries

The EMOS® SIL2 SAFETY SYSTEM helps prevent and protect against irreversible damage caused by all known events.

The 4 Pillars of the EMOS® SIL2 SAFETY SYSTEM

MODA – An Intelligent Data Acquisition Sensor

The MODA was especially designed for the cell room environment. It features a high degree of data acquisition precision, a fast sampling rate, temperature compensated measurements, and noise filtering algorithms.

See the MODA Datasheet for more info

SILCAM – A Logic Solver

The SILCAM contains the controller logic responsible for triggering the plant emergency shutdown system whenever an electrolyser or one (or more) of its cells are operating outside of their recommended safety parameters.

See the SILCAM Datasheet for more info

EMOS® SIL2 SAFETY ALGORITHMS – Protection Against All Known Events

For over two decades we have been monitoring electrolytic cells, which has enabled us to develop and integrate advanced algorithms which can help protect against irreversible damage caused by a variety of issues such as:

  • Anode coating loss
  • Cathode coating loss
  • Electrode passivation
  • Membrane poisoning
  • Insufficient electrolyte feed
  • Cell temperature control failure
  • Electrolyte concentration control failure
  • Differential pressure out of range
  • Cell leakage
  • Membrane pinholes, tears and blisters
  • Short circuits

EMOS® MONITORING – A Human-Machine Interface

EMOS® MONITORING is an application designed to monitor and manage process data obtained from the EMOS® SIL2 SAFETY SYSTEM, or any other OPC compliant system. It offers a customizable user interface for plant operation monitoring, reporting tools for alarms and cell voltages, the ability to trend individual or grouped elements, and much more!

See the EMOS® Monitoring Data Sheet for more info