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Day: October 29, 2021

What is a Draw-Wire Position Sensor? | How does it work?

Introduction A draw-wire position sensor is also known as a string pot, cable extension transducer, string potentiometer, or yo-yo sensor. A draw-wire sensor is a transducer that can detect and measure linear position and velocity. It is composed of a measuring cable, drum, spring, and rotational sensor. They are generally durable, easy to set up, …

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What is a Light Curtain Sensor? | How does it work?

Introduction A light curtain is an advanced method to protect personnel while working nearby a hazardous machine. This method is friendlier than conventional methods, like mechanical blocking. The light curtain system comprises infrared emitters and receptors, & control and logic circuitry. Besides, a feedback to the hazardous machine is deployed as well. This way, whenever …

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What is a Phase Sequence Relay? | How does it work?

Introduction A phase sequence relay is a protective relay. It guards a 3-phase device against any potential damage due to sequence change. They are deployed anywhere with a phase-sequence change that can damage the device or circuit. They work like a conventional electric relay. Once a phase fails or if a sequence changes, the phase …

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Differences between an Absolute and Incremental Encoder

Introduction An absolute encoder is an electronic sensor that tracks position data and retains the data even if the power is removed from it. In contrast, incremental encoders cannot retain the position data once the power supply is removed. This difference is a result of their difference in design. A closer look into their design …

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What is Soil Temperature Sensor | How does it work?

Introduction A soil temperature sensor is a device used to measure and monitor the temperature of the soil. They can help you determine the best time to sow or plant your garden. Thermistors, thermocouples, thermocouple wires, and averaging thermocouples are the different types of designs used for a soil temperature sensor. They are usually packed …

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What is Soil Humidity Sensor | How does it work?

Introduction A soil humidity sensor measure and monitor the amount of water content in the soil. The conventional gravimetric measurement needs more time in a lab & also dedicated labor. A soil humidity sensor uses other properties like electrical resistance or dielectric constant to measure the moisture content. They are very handy for farmers and …

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What is a CO2 Sensor? | How does it work?

Introduction A CO2 sensor is a device that can measure the concentration of carbon dioxide(CO2) in a given volume of gas. They have wide applications from controlling indoor air quality to regulating airflow in mines. The concentration of CO2 can be calculated either chemically or using non-dispersive infrared method(NDIR). Modern CO2 sensors are compact-sized and use the NDIR …

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What is an Evaporation Sensor | How does it work?

Introduction Evaporation sensors measure the rate of evaporation of water. It is used by researchers to analyze the climate and take readings, whereas farmers use it for making a budget. A conventional evaporimeter is a large & bulky setup used for the same purpose. But, modern electronic evaporation sensors are way too small and does …

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What is an Illuminance Sensor? | How does it work?

Introduction An illuminance light sensor senses the presence of light. Photodiodes and photoresistors are two types of devices used to sense light. They are responsible for the ambient screen brightness in your smartphone. When the photosensor in your phone detects high intensity it increases your phone’s brightness automatically. This is one of the many applications …

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What is PM2.5 Particulate Sensor? | How does it work?

Introduction Particulate matters(PM) refer to the liquid or solid matter suspended in the air. PM2.5 refers to the particles of size 2.5 micrometers or smaller. These coarse particles enter the body and can be found even inside our lungs. Finer particles even enter our bloodstream as well. A PM2.5 sensor uses the scattering of light to find …

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