PROBE FOR IRON SALT BATTERY MANAGEMENT SYSTEM

The invention provides a pH-probe for determining a pH value of an electrolyte of an iron salt battery, ISB, device, the pH-probe comprising: a Fe(II)/Fe(III) reference electrode comprising a reference chamber containing a solution with predefined concentrations of Fe(ll) and Fe(III); and a pH glass electrode; wherein the pH-probe is configured to measure a potential between the pH glass electrode and the Fe(II)/Fe(III) reference electrode, when the reference chamber and the pH glass electrode are immersed in the electrolyte of the ISB device. The invention further provides a Fe(III)-probe for determining a Fe(lll) concentration of an electrolyte of an iron salt battery, ISB, device, the Fe(III)-probe comprising: a Fe(II)/Fe(III) reference electrode comprising a reference chamber containing a solution with predefined concentrations of Fe(ll) and Fe(III); and a graphite electrode; wherein the Fe(III)-probe is configured to measure a potential between the graphite electrode and the Fe(II)/Fe(III) reference electrode, when the reference chamber and the graphite electrode are immersed in the electrolyte of the ISB device.