De Dietrich S101763 thermo-pressure gauge

This thermo-pressure gauge, branded De Dietrich, is a combined instrument that displays both temperature and pressure on a single dial. In a boiler or heating system, such gauges are typically mounted on the boiler body or on the flow pipework to give a visual indication of the operating conditions. They are used during commissioning, routine servicing, and troubleshooting to verify that the system is running within its intended range. Parts of this type are passive monitoring instruments; they do not interact with the burner control sequence or safety circuit. Selection is based on the measuring range for temperature and pressure, the scale accuracy, the connection thread size and type, and the mounting orientation (vertical or horizontal). For reliable readings, the normal working point should sit in the middle third of the scale, where the instrument’s accuracy is highest. When replacing an existing gauge, confirm that the connection dimensions and range match the original, and that the face is readable in the installed position.