The so-called AC voltage and current sensors are used to transfer AC voltages 220V, 380V, 500V and currents from 10mA to 500A quickly to the acquisition system. For example, the port of the SCM, the input of the PLC switch, the control terminal of the relay, etc. Circuit as shown below: Current type application circuit: figure 1 figure 2 image 3 Current type application circuit: Figure 4 Figure 5 Figure 6 Voltage type application circuit: From the above figure, it can be seen that it is very convenient in terms of detection equipment status, signal lamp status, AC current voltage over-limit protection, etc. The advantages of this sensor are as follows: 1. Very small 2. Response speed is only 100mS or less 3. Temperature range -40 degrees to +90 degrees 4. No need for any power 5. Very convenient to use 6. Low price Use areas include: industrial control, traffic signal control, environmental monitoring, voltage and current over-limit alarms. Current type: Use cautions: In use, must follow the connection method of Figure 1, Figure 2, Figure 3, Figure 4, VCC and CP can not be omitted between the diagram R, such as VCC directly access CP will cause permanent damage to the switch sensor device, In Figure 1, Figure 2, Figure 3, Figure 4, R range R = VCC / IR (IR less than 1A), in order to save power consumption, the user can take their own design to take R value, VCC +2 ~ 24V R generally takes 1K to 50K. The absorption current is preferably 0.25mA to 100mA, depending on the user's state of use. When the threshold current is greater than 0.5A, the temperature coefficient is better than the threshold current below 0.5A. Instructions: When the input current exceeds the set protection point current, the output is low level. When the input current is lower than the set protection point current, the output is +VCC. In the figure, R is the current limiting resistance when +V=5V When R is generally not less than 1kΩ, Figure 1 shows the test circuit. figure 1 Application Note: This product is suitable for monitoring the power line on the circuit is over the current limit, the state of the electrical equipment is working within the set range. Advantages of the product: no need of any power supply, remote transmission of power equipment working status, switching capacity for overcurrent protection devices, can completely replace active sensors and active isolation modules on the current market, can solve wiring and provide power for you Troubles. The resistance between the pin pin R and GND can be adjusted by the threshold current. This adjustment can only increase the threshold current. Typical performance characteristics: Voltage type: Instructions: When the input voltage exceeds the set overvoltage protection point, the output is low, when the input voltage is lower than the set overvoltage protection point, the output is +VCC, R in the figure is the current limiting resistor, when +V When R = 5V, R must not be greater than 10kΩ. The following figure shows the test circuit. Application Note: This product is suitable for monitoring the voltage on the line of the power grid is over the limit, the state of the power equipment is working within the set range, product advantages: without any power supply, you can remotely transmit the working status of the power equipment, The switching status of the overvoltage protection device can completely replace active sensors and active isolation modules on the current market, and can solve the problems of wiring and power supply for you. Use cautions: In use, must follow the connection method of Figure 1, Figure 4, Figure 5, Figure 6, VCC and CP can not be omitted between the diagram R, such as VCC directly into the CP end will cause the switch sensor device permanent damage, In Figure 1, Figure 4, Figure 5, Figure 6, R range R = VCC / IR (IR greater than 0.5mA, less than 1A), in order to save power consumption, the user can take their own design to take R value. Typical performance characteristics: