IoT Sensors: Types, Examples and Applications

Temperature sensors show whether equipment, stored goods or a process is heating or cooling. A room sensor measures air, while a correctly selected probe can measure a pipe or liquid. Choose the sensing element, mounting and response time for the installation; an air sensor does not automatically become an immersion probe.

Humidity sensors measure relative humidity alongside temperature to describe the moisture conditions in air. They help teams investigate storage excursions, condensation risks or greenhouse climate changes. Place the sensor away from direct spray and local heat sources, and check its recovery and calibration requirements for the expected environment.

Pressure transmitters monitor a fluid or gas and provide a signal for a gateway or controller. Pump discharge and filter differential pressure answer different questions and need different connection arrangements. Specify the working span, overload conditions, wetted materials and whether the measurement is gauge, absolute or differential pressure.

Level instruments indicate the contents of a tank, sump or reservoir. Ultrasonic, radar, pressure and float approaches suit different fluids and mounting points. Tank shape and sensor position affect the conversion from distance to volume, so confirm the geometry and validate low-level and overflow alerts during commissioning.

Flow meters provide the rate of movement and, when supported, a cumulative total. They help compare incoming supply, process use and discharge. The meter must suit the fluid, pipe size and installation arrangement; a pulse output also needs the correct pulse factor before the dashboard can show reliable totals.

A CO₂ sensor reports carbon dioxide concentration rather than every pollutant in the air. Readings can support ventilation review or controlled-growing applications when interpreted with occupancy and operating conditions. Confirm the sensor technology and calibration method; an estimated CO₂ value inferred from another signal is a different measurement.

Particulate sensors estimate airborne particle concentrations, often by optical scattering. PM2.5 and PM10 identify particle size fractions, while the dashboard reports the corresponding concentration and unit. Select the sampling arrangement for the location and review maintenance needs; an indoor sensor enclosure does not establish outdoor or regulatory suitability.

Vibration sensors capture mechanical movement on motors, fans, pumps and other rotating assets. A useful record depends on the mounting, sample rate and frequency band as well as the amplitude. Trending can highlight changes for investigation, but a single elevated reading does not identify a specific mechanical fault by itself.

Energy monitoring combines meter measurements with circuit identity, units and current-transformer settings. Current alone does not provide a complete electricity consumption record. A connected energy meter can supply kWh, power factor, voltage and other supported registers so operators can compare feeders and relate consumption to the operating schedule.

Soil-moisture probes indicate conditions at their installed depth and location. A field with different soil types or irrigation zones may need several measurement points. Check the probe’s calibration basis and compare trends with the grower’s observations before using the data to change pump or valve settings.

Light sensors measure illuminance or another specified optical quantity for buildings and growing environments. A lux reading describes light weighted for human vision; it does not replace every plant-light measurement. Choose the optical response, mounting direction and range for the decision the operator needs to make.

Proximity switches and door contacts provide a state such as present/absent or open/closed. These simple readings can explain access events or equipment position alongside other measurements. Decide how quickly a state change must be captured and distinguish an open contact from a disconnected cable in the installation design.

Begin with the decision: what should someone do when the reading changes? Define the normal and abnormal conditions, required accuracy and response time. Then check environmental exposure, power, network coverage and available mounting points. A sensor with the right range can still fail to answer the question if it is placed in the wrong location.

Agree units, device identifiers and a common timestamp convention before connecting the dashboard. Include disconnected probes, stale data, a gateway restart and loss of connectivity in commissioning. These checks help separate a process event from a measurement or communication problem, and give operators a record they can interpret.

Plan calibration, cleaning and battery changes alongside the installation. Record the model, measurement range, mounting position and settings for each sensor so a replacement can produce a consistent record. Check an instrument against a suitable reference during commissioning and document how the team recognises a missing or stale value.

Livwize integrates industrial temperature, humidity, energy, water and environmental measurements with gateways and dashboards. Review temperature sensor products and humidity sensors for environmental monitoring, or compare tank-level monitoring and air-quality monitoring for the application. A deployment brief should identify the fitted model, measurement range, interface and enclosure.