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Siemens’ RTD rapidly fell out of favour due to the instability of the temperature reading. Hugh Longbourne Callendar developed the first commercially successful platinum RTD in 1885. A 1971 paper by Eriksson, Keuther, and Glatzel identified six noble metal alloys (63Pt37Rh, 37Pd63Rh, 26Pt74Ir, 10Pd90Ir, 34Pt66Au, 14Pd86Au) with approximately ...
Has an ATmega328 with Arduino bootloader, a dual H-bridge and additional prototyping space and headers. It is compatible with many shields, though four digital pins are used when operating the motor controller. Has an onboard voltage regulator, additional LEDs, a temperature sensor, and a light sensor. Part of the DFRobotShop Rover kit ...
The program features include time schedules, set points, controllers, logic, timers, trend logs, and alarms. The unit controllers typically have analog and digital inputs that allow measurement of the variable (temperature, humidity, or pressure) and analog and digital outputs for control of the transport medium (hot/cold water and/or steam ...
A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much of it is water vapor. [1] Humidity measurement instruments usually rely on measurements of some other quantities, such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed.
For example, a temperature-controlled circulating bath has two PID controllers in cascade, each with its own thermocouple temperature sensor. The outer controller controls the temperature of the water using a thermocouple located far from the heater, where it accurately reads the temperature of the bulk of the water.
In 1982, [18] an early concept of a network connected smart device was built as an Internet interface for sensors installed in the Carnegie Mellon University Computer Science Department's departmental Coca-Cola vending machine, supplied by graduate student volunteers, provided a temperature model and an inventory status, [19] [20] inspired by ...
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