De Dietrich 95365161 large flat thermometer

This De Dietrich 95365161 large flat thermometer is a temperature-indicating instrument intended for visual reading in heating systems. It falls under the thermometers and manometers category, which groups components that support commissioning and service rather than directly controlling the firing process. Temperature readings from such instruments allow a heating engineer to verify that the system reaches its intended operating temperature, to cross-check electronic sensor values, and to observe behaviour during start-up or fault-finding. Thermometers of this type are selected primarily by their measuring range and accuracy, together with the connection or mounting arrangement. To obtain the most reliable reading, the expected working point should lie in the middle third of the scale. This part is designated as a large flat thermometer, but no specific range, connection size, or mounting detail is given in the product data. The manufacturer codes are 95365161 and 336.796.003, both from the De Dietrich brand. When replacing a thermometer of this class, verify that the new unit matches the original in terms of scale range, connection thread or fixing method, and any required immersion depth. The scale should cover the normal operating temperatures of the circuit without going beyond the maximum. Using a thermometer with an inappropriate range reduces reading accuracy and may give misleading indications during service.