Turn the knob of the sample protection thermostat to maximum.Set the control temperature to 2°C above the desired operating temperature and wait for the temperature to stabilise.Turn the knob of the sample protection thermostat slowly anti-clockwise until a click is heard and “Otc” is displayed. The audible alarm will sound continuously to warn you that the bath is controlling using the sample protection thermostat.Re-set the control temperature to the desired temperature using the “+” and “-” keys. The audible alarm will sound continuously until the primary control system is re-activated.In the unlikely event of failure of the primary temperature control system, the sample protection thermostat will maintain the water in the bath at a temperature a few degrees above the set temperature and with greater fluctuations. The display will cycle between “Otc” and the actual bath temperature and the audible alarm will sound intermittently. If this happens, first check that the sample protection thermostat is not set to a lower temperature than the primary control system. If that is not the reason, the bath can continue to be used without compromising the safety of persons or the surroundings until current work is completed. However, it is recommended to have the bath checked by a competent person as soon as conveniently possible.