LED digital thermometer temperature measuring instrument -50/150/ upper and lower limit alarm function control level NTC probe Working voltage: 4-15V power supply Measurement range: -40.0 [C-150.0] C Power consumption: temperature recovery value / lower limit value, otherwise it can not be saved. 2. temperature control application scenario: For example, for refrigeration. CH1=30.0 CH=0; CH3=0.5 CH4=1 CH6=1 The upper limit temperature is 30.0 degrees, the lower limit value of CH2 is not used, but the adjustment rule must be satisfied. The recovery value is set to 0.5 degrees. When the temperature is higher than 30.0 degrees, the alarm signal is generated, the output control level is driven to work. When the temperature drops to or below (30.0-0.5) 29.5 degrees, the output control level is stopped, and the refrigeration stops working slowly. When the temperature rises to 30.0 degrees again, a control signal is generated again to make the refrigerator work. The function of the recovery value of 0.5 degrees is to prevent the refrigeratory from starting repeatedly near the set temperature critical value and damaging it. For example, for heating purposes. CH1=50.0 CH2=37.0 CH3=0.5 CH5=1 CH6=1 The lower limit temperature is 37.0 degrees, the upper limit value of CH1 is not used, but the adjustment rule must be satisfied. The recovery value is set to 0.5 degrees. When the temperature is lower than 37.0 degrees, the alarm signal is generated, the output control level is driven heating cord to work. When the temperature rises to or exceeds (37.0/0.5) 37.5 degrees, the output control level is stopped, and the temperature is slowly stopped. When the temperature drops to 37.0 degrees again, a control signal is generated to make the heating cord work. The function of the recovery value of 0.5 degrees is to prevent theheating cord from being damaged by repeated start-up near the set temperature threshold.