Mercury switch is a type of circuit switch. Mercury is stored in a small container. It should be noted that mercury has great harm to the human body and the environment, so when using the mercury switch, you must be careful to avoid The mercury breaks out and hurts the human body. The mercury switch has a simple structure, low price and high quality, and is widely used in life. This article mainly introduces the working principle and some applications of the mercury switch. Let's take a look with the product officer.
Mercury switch applications are generally specially made on thermometers, which can be used as temperature sensing elements of automatic temperature controllers. Mercury switches, also known as tilt switches, are a type of circuit switches, usually a small glass bubble container with a small drop of water stored in it. Silver, most of the containers are filled with inert gas or vacuum. Because of gravity, the mercury beads will flow to the lower part of the container, because mercury is a conductive liquid, if it touches two electrodes at the same time, the circuit will be Connected, otherwise the circuit is disconnected. Because the on-off of the mercury switch is related to the horizontal angle of the object, it is often used in some automatic control circuits.
For example, the working principle of the mercury switch alarm is because of gravity, the mercury droplets will flow to the lower part of the container. If they touch two electrodes at the same time, the switch will close the circuit and open the switch. The shape of the container also It will affect the conditions for the mercury droplets to contact the electrodes. For example, the postal bomb will be in an inverted V shape, so that the recipient will tilt the postal package, close the circuit, and brake the explosion without knowing it, but the sender (or parcel carrier or manufacturer) will not.
Note: Mercury is toxic to the human body and the environment, so please be careful when using the mercury switch to avoid breaking; it should also be handled properly when it is no longer used. Features The mercury switch is packaged in a glass case or a metal case according to the Compared with mechanical switches, mercury switches have many characteristics:
1.It can be used in harsh environmental conditions. Since the mercury switch is sealed, the mercury inside is isolated from the outside world, so it can be used in environments with oil, steam, dust and corrosive gases.
2.The external force required for switching on and off is small. Mercury is the only metal that can remain liquid at room temperature, and its surface tension and specific gravity are large. As long as a little external force makes the mercury switch tilt, the mercury can move, making the switch on and off.
3.Mercury has good conductivity, and the contact resistance between mercury switch electrodes is generally less than 100mΩ.
4.The allowable current of the mercury switch depends on the material of the electrode, the maximum allowable current of the tungsten wire electrode is 10A, and the maximum allowable current of the general alloy wire is generally 1A.
5.Since the on-off of the mercury switch is determined by the gravity of mercury, it can work reliably for a long time.
6.The contacts of the electrodes are in liquid contact without any noise.
7.Since mercury can flow, as long as the acceleration reaches above the set value, the mercury switch can be turned on or off, so it can be used as a vibration sensitive element.
8.Small size, various forms, and a fully sealed device.
9.Simple structure and low price.
10.High quality, high quality product, suitable for beginners.
