Flow switches are often used in conjunction with relays in applications. Often, some customers encounter many problems when using flow switches. Now, the power and voltage selection of relay wiring and relays is a simple and practical explanation and analysis to help use. The customer of the flow switch answers the above question.
First, the relay's foot to determine the relationship between the line and the foot: general relay casing marked, if not, using a multimeter to measure it is also very simple: ready: 5V power supply, multimeter.
step:
1. Find the coil pin.
Use a multimeter to measure the resistance between the pins. The two pins with resistances of the order of hundreds to 1K ohms are the coil pins. Note that the coils of some relays are divided into positive and negative poles. Although the reverse connection is not damaged, it does not act.
2. Find out the normally open and normally closed points.
Use a multimeter to measure the four pins except the coil. The two pins that are turned on are normally closed. Apply 5V DC to the coil to make the relay act. They should be disconnected. If they are not disconnected, the interior is short. Connected.
Add 5V DC to the coil to make the relay operate. At this time, use a multimeter to measure. If there are two original pins that are not connected, then they are normally open.
3. The pin that is related to the normally open point and has a relationship with the normally closed point is the public end.
Second, pay attention to the flow switch with the use of relay power and voltage matching, must not be directly connected to the flow switch electrical serial circuit, so as not to burn.
First, the relay's foot to determine the relationship between the line and the foot: general relay casing marked, if not, using a multimeter to measure it is also very simple: ready: 5V power supply, multimeter.
step:
1. Find the coil pin.
Use a multimeter to measure the resistance between the pins. The two pins with resistances of the order of hundreds to 1K ohms are the coil pins. Note that the coils of some relays are divided into positive and negative poles. Although the reverse connection is not damaged, it does not act.
2. Find out the normally open and normally closed points.
Use a multimeter to measure the four pins except the coil. The two pins that are turned on are normally closed. Apply 5V DC to the coil to make the relay act. They should be disconnected. If they are not disconnected, the interior is short. Connected.
Add 5V DC to the coil to make the relay operate. At this time, use a multimeter to measure. If there are two original pins that are not connected, then they are normally open.
3. The pin that is related to the normally open point and has a relationship with the normally closed point is the public end.
Second, pay attention to the flow switch with the use of relay power and voltage matching, must not be directly connected to the flow switch electrical serial circuit, so as not to burn.
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