1. Temperature Sensors:
Thermocouples:
Measure temperature by exploiting the voltage difference between two dissimilar
metals.
RTDs (Resistance
Temperature Detectors): Use the change in electrical resistance with
temperature to measure temperature accurately.
Thermistors:
Provide a highly sensitive and nonlinear response to temperature changes.
2. Pressure Sensors:
Pressure
Transducers: Convert pressure into an electrical signal, typically using strain
gauges or piezoelectric elements.
Pressure Switches:
Trigger an electrical output when a specific pressure threshold is reached.
3. Flow Sensors:
Flow Meters:
Measure the rate of fluid flow, and can be based on principles like
electromagnetic, ultrasonic, or differential pressure.
Flow Switches:
Activate an electrical signal when flow rates fall below or exceed certain
thresholds.
4. Level Sensors:
Ultrasonic Level
Sensors: Use sound waves to determine the distance between the sensor and the
fluid surface.
Capacitance Level
Sensors: Measure the change in capacitance as a function of liquid level.
Float Switches:
Activate when a buoyant float reaches a specific level in a liquid.
5. Humidity Sensors:
Relative Humidity
Sensors: Measure the moisture content in the air, often using capacitive or
resistive sensors.
6. pH Sensors:
pH Probes:
Determine the acidity or alkalinity of a solution by measuring the potential
difference between two electrodes.
7. Gas Sensors:
Gas Detectors:
Detect the presence of specific gases or the concentration of gases in the air.
8. Proximity Sensors:
Inductive Proximity
Sensors: Detect the presence or absence of metal objects without physical
contact.
Ultrasonic
Proximity Sensors: Measure distance to an object by emitting ultrasonic waves.
9. Position Sensors:
Potentiometers:
Measure angular or linear position using a variable resistor.
Encoders: Convert
rotational or linear motion into electrical signals.
10. Light Sensors:
Photocells
(Photoresistors): Vary resistance in response to changes in light intensity.
Photodiodes and
Phototransistors: Generate electrical current when exposed to light.
11. Vibration Sensors:
Accelerometers:
Measure acceleration or vibration and are often used for condition monitoring.
12. Current and Voltage Sensors:
Current
Transformers (CTs): Measure alternating current (AC) or direct current (DC) for
monitoring power consumption.
Voltage
Transformers (VTs): Measure voltage levels in power distribution systems.
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