Johdotuslämpömittari

A johdotuslämpömittari, or wired temperature sensor, is a device used to measure temperature and transmit that data through a physical wire. Unlike wireless sensors that rely on radio signals, these sensors are permanently connected to a monitoring system. The connection can be a simple two-wire setup or a more complex multi-wire configuration depending on the sensor type and the required accuracy.

The core component of a johdotuslämpömittari is the sensing element, which changes its electrical properties in response to temperature. Common sensing elements include thermocouples, resistance temperature detectors (RTDs), and thermistors. Each type has different characteristics regarding accuracy, temperature range, and cost. The electrical signal from the sensing element is then converted and transmitted along the wire to a display or data logger.

These sensors are widely used in industrial applications where reliability and continuous monitoring are crucial. Examples include monitoring temperatures in manufacturing processes, HVAC systems, refrigeration units, and laboratory equipment. Their wired nature makes them less susceptible to interference and ensures a consistent and stable data stream, which is often preferred for critical applications. Installation requires running physical wires from the sensor's location to the central monitoring point, which can be a consideration in existing structures. Maintenance typically involves checking the integrity of the wiring and the sensor itself.