What is temperature controller?
Temperature controller is based on the temperature changes in the working environment, and regulation and control of a device, the physical deformation occurs inside the switch, thus producing some special effects, resulting in a series of automatic control elements on or off action, or electronic components at different temperatures, the different principles of the working state to provide temperature data to the circuit to power the circuit to acquire the data of temperature.
Temperature controller currently plays an important role on many occasions. Its role is reflected in the measurement of the temperature of the thermocouple, and then compared with the set value, to calculate the temperature of the heater to maintain and time.
Application of temperature controller
Heater temperature controller is used in a wide range of applications, depending on the type of thermostat used in many products such as home appliances, motors, refrigeration or heating.
Advantages of using temperature controller
Heater temperature controller with temperature set point, high and low temperature alarms and multiple displays via front panel LCD/LED.
Temperature controllers are suitable for use with electric heaters, temperature control strips, cooling coils and other laboratory or industrial heating equipment where temperature control is required.
Heater temperature controller analog output interface allows connection to loggers and external programmers.
The temperature control of the sample to be controlled is achieved and the actual temperature and the safe set temperature are displayed.
All temperature controllers use PID temperature control technology and have a safety sensor interface for operating sensors, as well as a heating output interface, a temperature logger and an RS232 communication interface.
How do temperature controllers work?
The working principle of the temperature controller is to automatically sample and instantly monitor the ambient temperature through the temperature sensor, and when the ambient temperature is higher than the control setpoint, the control circuit starts and the control return can be set. If the temperature is still rising, the over-limit alarm function is activated when it rises to the set over-limit alarm temperature point. When the controlled temperature can not be effectively controlled, in order to prevent the destruction of the equipment can also stop the equipment to continue to run through the function of tripping. It is mainly used in various high and low voltage switchgear, dry-type transformers, box-type substations and other related temperature fields used in the electric power sector.
Types of temperature controllers
Surge temperature controller
A variety of
surge temperature controller is a new type of bimetal thermostat, mainly as a variety of electric heating products with overheating protection, usually used in series with the thermal fuse, sudden jump thermostat as a level of protection. A thermal fuse is in the sudden jump thermostat lost Lou or failure of the electric heating element overtemperature, as a secondary protection since, effectively prevents burned electric heating element and the resulting fire accidents.
Liquid rise type temperature controller
Liquid rise temperature controller is when the temperature of the controlled object changes so that the temperature controller temperature-sensitive part of the material (generally liquid) to produce the corresponding physical phenomenon of thermal expansion and contraction (volume change), and the temperature-sensitive part of the membrane box connected together to produce expansion or contraction. The lever principle, drive the switch on and off action, to achieve the purpose of constant temperature liquid up temperature controller with accurate temperature control, stable and reliable, open and stop temperature difference is small, control temperature control adjustment range is large, overload current and other performance characteristics. The liquid expansion thermostat is mainly used in the home appliance industry, electric heating equipment, refrigeration industry and other temperature control occasions with.
Pressure type temperature controller
The temperature controller automatically closes the contact when the temperature setting value is reached through the closed temperature pack and capillary tube filled with temperature-sensitive material, which transforms the change of the controlled temperature into the change of space pressure or volume, and closes the contact automatically through the elastic element and fast instantaneous mechanism to achieve the purpose of automatic temperature control. It consists of three parts: the temperature-sensing part, the temperature-setting main part, and the micro switch or automatic damper that performs opening and closing. Pressure type thermostat is suitable for refrigeration appliances (such as refrigerators and freezers, etc.) and heaters, etc.
Electronic temperature controller
Electronic temperature controller (resistance type) use resistance to measure the method of temperature sensing, generally using platinum wire, copper wire, tungsten wire, and thermistors as temperature resistance, these resistors have their advantages. Most general household air conditioners use thermistor type.
How to use temperature controller?
When the temperature controller is powered on, the upper row of the display window shows "index number and version number" and the lower row shows "range value" for about 3 seconds and then enters the normal display state.
Temperature controller temperature and thermostat time reference and setting
1) If the temperature controller does not have the thermostat timing function: click the "Set" key to enter the temperature setting state, the lower row of the display window shows the prompt "SP", the upper row shows the temperature setting value (first single-digit value flashing), can be modified to the desired setting value by shifting, increasing, decreasing keys; then click the " Set" key to exit this setting state, the modified setting value is automatically saved.
2) If the temperature controller has a constant temperature timing function
Click the "Set" key of the temperature controller, enter the temperature setting state, the lower row of the display window shows the prompt "SP", the upper row shows the temperature setting value (first single-digit value blinking), modify the method as above; then click the "Set" key, enter the constant temperature time setting state, the lower row of the display window shows The prompt "ST" is displayed in the lower row of the display window, and the set value of thermostat time is displayed in the upper row (the first single-digit value flashes); click the "Set" key again to exit this setting state, and the modified set value is saved automatically.
When the thermostat time is set to "0", it means that there is no timing function, the temperature controller runs continuously, and the lower row of the display window shows the temperature setting value; when the setting time is not "0", the lower row of the display window shows the running time or temperature setting value (see VII. Internal parameters table-2 in the running time display mode (the value of the parameter ndt)), when the display of the running time, the lower row of the single decimal point is lit, and so the measurement temperature controller to reach the set temperature, the timer starts timing, the lower row of the single decimal point flashes, timing time to the end of the operation, the lower row of the display window shows "End", the buzzer beeping, beeping sound after 1 minute Stop chirping. After the end of operation, long press the "Decrease" key for 3 seconds to restart the operation.
Note: If the temperature setting value is increased during the timing process, the meter will start timing again from 0. If the temperature setting value is reduced, the meter will continue to keep timing.
Temperature controller sensor abnormal alarm
If the upper row of the temperature controller display window shows "---", it means the temperature sensor is faulty or the temperature exceeds the measuring range or the controller itself is faulty, the controller will automatically disconnect the heating output, the buzzer will beep continuously and the alarm light will be on, please check the temperature sensor and its wiring carefully.
When the temperature controller is over temperature alarm, the buzzer will beep and beep and the "ALM" alarm light will be on; when the temperature controller is under deviation alarm, the buzzer will beep and beep and the "ALM" alarm light will be flashing. The buzzer does not chirp.
The buzzer can be silenced by pressing any key when it is sounding.
"Increase" key: click this key in the set state to increase the set value, and press and hold this key to increase the set value continuously.
If no key is pressed within 1 minute in the setting state, the temperature controller will automatically return to the normal display state.
Temperature controller system self-tuning
When the temperature control effect is not satisfactory, the system can be self-tuned. There will be a large overshoot in the process of self-tuning, so please consider this factor before self-tuning.
Press and hold the "Shift/Self-tuning" key for 6 seconds in the non-setting state to enter the system self-tuning program, the "AT" indicator will flash, the indicator will stop flashing after the self-tuning is finished, the controller will get a better set of system PID parameters, and the parameter values will be saved automatically. In the process of system self-tuning, press and hold the "Shift/Self-Tuning" key for 6 seconds to abort the self-tuning procedure.
If there is an upper deviation over the temperature alarm during the system self-tuning process, the "ALM" alarm light will not light up and the buzzer will not beep, but the heating alarm relay will be automatically disconnected. The "Set" key is invalid during the system self-tuning process. The lower row of the display window of the controller always shows the temperature setting value, no matter whether there is a constant temperature time setting or not during the system self-tuning process.
Reference and setting of internal parameters of the temperature controller
Press and hold the set key for about 3 seconds, the lower row of the controller display shows the password prompt "Lc", and the upper row shows the password value, which can be modified to the desired password value by increasing, decreasing, and shifting the key. If the password value is not correct, the controller will automatically return to the normal display state. If the password value is correct, the controller will enter the internal temperature parameter setting state, and then click the setting key to modify each parameter in turn. Press and hold the set key for 3 seconds to exit this state, and the parameter value will be saved automatically.
Temperature controller installation precautions
Leave enough space for ventilation.
Avoid heat-prone parts, such as transformers, high-power capacitors, etc.
Keep away from high voltage and high power equipment and wiring as much as possible.
To reduce noise interference, use a shielded cable for input and good grounding.
The communication cable and signal cable should be separated from the equipment power line.
A temperature and humidity controller should be installed as far as possible to maintain the level, to facilitate its normal heat dissipation
When fixing the temperature and humidity controller, the mounting bracket should not be too tight or too loose.
If it is necessary to work under the condition below 0°C, the temperature and humidity controller should be preheated at room temperature for 2 hours first: otherwise, it will lead to malfunction or damage.
Where to buy temperature controller?
ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector. If you are interested in our temperature controller or have any questions, please write an e-mail to info@antiteck.com, we will reply to you as soon as possible.
