Digital Temperature Controller
Introduction Digital Temperature Controller :
Digital temperature controllers were used in a variety of applications, ranging from industrial processes to consumer products.
For example, industrial applications such as HVAC systems, food processing, or chemical processing often require precise temperature control to the ensure quality and safety.
Specifications:
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Supply Voltage :12V
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Measuring Inputs : NTC10K
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Cable Length : 200
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Dimensions : 5 x 4 x 3 cm
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Weight :50 grams
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Circuit Operation:
temperature was the most often measured environmental quantity and many biological, chemical, physical, mechanical, and electronic systems were affected by temperature. Some of the processes work well be only within a narrow range of temperatures. So proper care must be taken to monitor and protect the systems.
When temperature limits are exceeded, electronic components and circuits may be damaged by exposure to high temperatures. Temperature sensing helps to enhance circuit stability. By sensing the temperatures inside the equipment, high-temperature levels could be detected and actions can be taken to reduce system temperatures, or even shut the systems down to avert disasters.
Some of the temperature control applications were Practical Temperature Controller and Wireless over Temperature Alarms Circuit Diagrams discussed below.
Practical Temperature Controller. This type of controller is used in industrial applications for controlling the temperature of devices. It also displays the temperature on 1 LCD in the range of –55°C to +125°C. At the heart of the circuit is the microcontroller from the 8051 family which controls all its functions. IC DS1621 is used as the temperature sensor.
The DS1621is gives the 9 bits of the readings to show the temperatures. User-defined temperature settings are stored in a nonvolatile memory EEPROM through the 8051 series microcontroller. Maximum and minimum temperature settings are entered into the MC through a set of switches which are stored in the EEPROM -24C02. Maximum and minimum settings are meant to allow any hysteresis necessary. The set button is used first and then the temperature setting by INC and then the enter button. Similarly for the DEC button. A relay was driven from the MC through a transistor driver. The contacts of the relay are used for the load, shown as a lamp in the circuit. For the high power heater load, a contactor may be used, the coil of which is operated by the relays contacts in place of the lamp as shown.
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How the Digital Temperature Controller Work:
Courtesy of Danaher Industrial Controls Groups - Process Automation, Measurements & Sensing See all of the Danaher's Partlow and West Controllers
Why do we need temperature controllers?
Temperature controllers are needed in any situation requiring a given temperature to be kept stable. This could be in a situation where an object was required to be heated, cooled, or both and remain at the target temperature (setpoint), regardless of the changing environment around it. There are two fundamental types the temperature control; open loop and closed-loop control. The open loop was the most basic form and applied continuous heating/cooling with no regard for the actual temperature output. It is analogous to the internal heating systems of the car. On a cold day, you may need to turn the heat on to full of warm the car to 75°. However, during warm weather, the same setting would leave the inside of the car much warmer than the desired 75°.
Open loop control block diagram Closed loop control was far more sophisticated than open loop. In a closed-loop application, the output temperature was constantly measured and adjusted to maintain a constant output at the desired temperature. Closed loop control is always conscious of the output signal and shall feed this back into the control process. Closed loop control was analogous to a car with internal climate control. If you set the car temperature to 75°, the climate control would automatically adjust the heating (during cold days) and cooling (during warm days) required to maintain the target temperature. The simplest example of a temperature controller was a common thermostat found in homes. For instance, a water heater uses a thermostat to control the temperature of the water and maintain it at a certain commanded temperature. Temperature controllers are also used in ovens. When a temperature is set for an oven, a controller monitors the actual temperature inside the oven. If it falls below the set temperature, it sends a signal to activate the heater to raise the temperature back to the set point. Thermostats are also used in refrigerators. If the temperature gets too high, a controller initiates an action to bring the temperature down.
Frequently Asked Questions
What is a digital temperature controller?
A digital temperature controller is an electronic device used to maintain the temperature of the item at a constant level. The microprocessor-based technology records electronic temperature levels through the use of the sensor and checks them against the desired set points.
How does a temperature control module work?
A TCU works by using an electric heater, either immersion or continuous, to heat the fluid in the system, then circulate it from the TCU to the machine tools and vice-versa. The fluid used may be water, pressurized water, or oil, depending on the temperature range.
What is a temperature sensor module?
Description Reviews (0) Related Products (1) The Temperature Sensor Module uses a thermistor that returns the ambient temperature in the form of a resistance value, which is then used to alter Vcc. The temperature could be read as an analog value or set to trigger a digital signal when a threshold was reached.
Where is the HVAC module?
The procedure to replace an HVAC electronic control module would vary depending on the year, make, and model of your vehicle. The control module was usually located inside the dashboard, behind, or integrated into the back of the climate control center.
What is the function of the TCU?
The Telematics control unit (TCU) was the embedded onboard system that controls wireless tracking, diagnostics, and communication to and from the vehicle. These systems could be used in eCall crash notification, electronic tolling, and vehicle tracking, many others.
