| Designation | Radiator pipe thermometer with aluminum block | 
| Model | 2309 | 
| Applications | Pipe, radiator dial temperature | 
| Nominal size (mm) | Ø63 | 
| Scale ranges | 0-120℃ | 
| Accuracy class | 2.5 | 
| Design | Stem with bracket, fix on pipe with clamp | 
| Pressure rating, max in bar of thermowell/stem | / | 
| Wetted parts | Copper alloy | 
| Connection | Center back | 
| Case material | Chrome plated steel, staffnless steel beze | 
| Window | Glass | 
| Switch rating | Model 2307 with concave back, fix on pipe with spring |