Is the Carousel Temperature Controller compatible with my hotplate? Is it available? None of our current Carousel Stirring Hotplates can be used with a Carousel Temperature Controller, only a Pt1000 probe (optional – if solution control is required). The most recent Carousel Temperature Controller we offered was part number RR91210. We can currently supply an equivalent controller (Heidolph EKT Hei-Con, part number 509-88000-00), but only as a spare part for customers with previous hotplate models that were compatible with RR91210 rather than a Pt1000. If you’re not sure whether a particular hotplate you have is compatible with a Carousel Temperature Controller or a Pt1000, check the socket on the hotplate – the Carousel Temperature Controller socket is 5-pin, whereas a Pt1000 socket is 4-pin, and the sticker should tell you which it is too – see below. Old hotplates – compatible with Carousel Temperature Controller (or Heidolph EKT Hei-Con) Current hotplates – compatible with Pt1000