ITEM NAME:2-CH 5-24V Digital LED Display Intelligent Temperature Controller with 2 probe F unction: High precision digital display intelligent temperature controller, mainly  	used in hot water circulation, return water system control and other  	occasions. Digital tube real time high and low temperature zone temperature  	measurement point temperature value. Through the high and low temperature  	difference between the temperature and the set temperature value, and the  	lower limit of the temperature difference to control the relay output,  	realize the cold, thermal cycle, improve the thermal efficiency. The work  	and the control power supply are used to isolate the power supply, and the  	voltage fluctuation of the control board is prevented from starting and  	stopping of the large power equipment. Job description: Two working modes of this product integration: one way working mode and two  	way working mode. One way working mode: when the DS-A temperature minus the DS-B temperature  	is greater than the set temperature difference, the relay A action, you can  	start the relay related equipment. When the temperature difference is less  	than the preset temperature difference return difference, the relay A is  	disconnected, and the related equipment stops working. DS-B is greater than  	DS-A, the relay does not move. Two way working mode: when the absolute value of the difference between the  	two sensor temperature is greater than the preset temperature difference,  	relay A action, you can start the relay related equipment. When the  	temperature difference is less than the preset temperature difference return  	difference, the relay A is disconnected, and the related equipment stops  	working. Set example 1: solar hot water circulation, high temperature probe - low  	temperature probe >5.0 degrees, relay action, the difference back to 4.5  	degrees relay off. The low temperature probe is larger than the high  	temperature probe, and the relay does not move..Set example 1: solar hot water circulation, high temperature probe - low temperature probe >5.0 degrees, relay action, the difference back to 4.5 degrees relay off. The low temperature probe is larger than the high temperature probe, and the relay does not move.