The RAM1 cylinder/pipe thermostat is a mechanical thermostat with a bi-metallic sensor which, under normal operation and installed in the correct manner, is set to control with a switching differential of 6°C. However, this is adjustable if required between 5°C and 10°C The setting range of this thermostat is from 15°C frost protection to 90°C. Each terminal screw has its own number shown on the plastic pillar adjacent to the screw.
eBay