The dry contact of the barrier is an electrical switch that has two positions: closed and disconnected. There is no polarity between the two contacts of the dry contact and is interchangeable. That is, a simple switch, the contact does not provide power supply, and the power supply can be used to control the condition of the equipment. But not providing power does not mean that there is no electricity, it is part of the circuit. Dry contact interfaces can be divided into normally open dry contacts and normally closed dry contacts.
Common dry contact signals are: a variety of switches such as: limit switches, travel switches, foot switches, rotary switches, temperature switches, liquid level switches, etc.; power supply and a variety of buttons; Output of a variety of sensors, fire, alarm sensors, vibration, smoke and condensation sensors; Relay output, relay output, reed switch output, etc. The wet contact is an active switch, which has 2 conditions: electric and non-electric; There is polarity between the 2 contacts. If the dry contact signal is connected to the power supply, and then the other pole of the power supply is used as the output, it is the wet contact signal.
The safety barrier uses current and voltage limiting circuits to constrain the energy transferred from the safe place to the risk site. Intrinsically safe equipment in a risk location can operate at such energy, but this energy is not sufficient to ignite an explosive atmosphere, and even if the intrinsically safe equipment itself fails, no electrical sparks or hot surfaces can ignite.
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P+F proximity switch selection points
1. Select the proximity switch type according to the detected object. If the detection object is metal, the inductive proximity switch is preferred, and if the detection object is a non-metal such as wood, plastic, paper, water, etc., or a smaller and finer metal, a capacitive proximity switch should be selected.
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The structure of proximity sensor switches – we are blessed
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The reason why the switch has such a long life is that the switch acts as elastic from the vertical direction of the elastic membrane. Although millions of peristalsis are carried out after the elastic membrane, because the creep rate is very small, only 0.1 - 0.3m ...
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3. The launch surface of the probe should be parallel to the surface of the liquid.
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How to install the safety barrier
1. The safety barrier should be installed in a safe place, and the environmental conditions meet the requirements of "application conditions" in the "Safety Barrier Selection Sample".
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