De Dietrich 95365157 large flat thermometer

This De Dietrich large flat thermometer (catalogue article 336.796.001, manufacturer code 95365157) belongs to the group of instrumentation and service accessories that support system monitoring rather than the firing sequence itself. Thermometers of this type are used for visual temperature indication on boilers, burners, or heating circuits, allowing the engineer to check operating conditions during commissioning, routine service, or fault finding. The "large flat" designation typically refers to a dial thermometer with an enlarged face for easier reading from a distance, but the exact scale range, connection thread, and stem dimensions are specific to the part number and must be verified against the application. For such thermometers, selection is based on the required measuring range and accuracy, the type of connection (e.g., threaded or clamp), and the mounting arrangement (direct immersion or surface contact). The working temperature of the system should fall near the middle of the scale, where reading accuracy is highest. When replacing a thermometer of this type, confirm that the connection size and insertion length match the existing fitting, and that the scale range covers the normal operating temperature without exceeding the maximum rating. The part is branded De Dietrich; no further compatibility with specific appliance models is stated.