Temperature controller is an instrument used to control temperature. The temperature controller takes an input from a temperature sensor and has an output that is connected to a control element such as a heater or fan.
To accurately control process temperature without extensive operator involvement, a temperature control system relies upon a controller, which accepts a temperature sensor such as a thermocouple or RTD as input. It compares the actual temperature to the desired control temperature, or setpoint, and provides an output to a control element. The controller is one part of the entire control system, and the whole system should be analyzed in selecting the proper controller.
The following items should be considered when selecting a controller:
- Type of input sensor (thermocouple, RTD) and temperature range.
- Type of output required (electromechanical relay, SSR, analog output).
- Control algorithm needed (on/off, proportional, PID).
- Number and type of outputs (heat, cool, alarm, limit).
The Standard Sizes available in the market
Since temperature controllers are generally mounted inside an instrument panel, the panel must be cut to accommodate the temperature controller. In order to provide interchangeability between temperature controllers, most temperature controllers are designed to standard DIN sizes. The most common DIN sizes are shown below
A Data logger is defined as an electronic instrument that records measurements of all types at set intervals over a period of time
Data loggers can record a wide variety of energy and environmental measurements including temperature, relative humidity, AC/DC current and voltage, differential pressure, water level, soil moisture, rainfall, wind speed and direction, pulse signals, and more....
Typically, data loggers are compact, battery-powered or Mains operated devices equipped with an internal microprocessor, data storage, and one or more sensors.
The data loggers are available in single channels to 4 , 8 , 16 , 32 , 48 , 64 channels and more. It can give alarm output for group of channels.
The dataloggers communicates with the computers to give the output of the recorded data in excel format or other tailormade templates or trend output.