Pressure switch normally open and normally closed in the end is what meaning, please use the popular language to talk about how the pressure switch on how to check
In general, normally open normally closed is talking about the switch in the absence of pressure (atmospheric pressure, no pressure of the working fluid) contact off the situation, no pressure, the closure of a pair of contacts is normally closed contact , A pair of open contacts is often open contact.
After the pressure switch reaches the action value, normally open, normally closed action will flip, that is, after the pressure action, normally open contact closed, normally closed contact open.
And when the pressure becomes low, to release the value of the time, the switch again action, back to the atmospheric pressure contact state, can also be considered the initial state.
General pressure switch, normally open contact with NO said, normally closed contact with NC said that the middle of the COM, is the two contacts of the public contacts.
For the start of the device to allow the conditions, generally followed by open,
Trip device, chain start the device, the general then closed.
The normally open of the pressure switch is when the pressure is not applied, the state is open, when the pressure exceeds the rated value, the switch becomes off. Normally closed means that the switch is closed when no pressure is applied, and when the pressure exceeds the rated value, the switch turns on.
The pressure switch is a simple pressure control device, when the measured pressure reaches the rated value, the pressure switch can issue an alarm or control signal. The working principle of the pressure switch is: when the measured pressure exceeds the rated value, the free end of the elastic element displacement, directly or after comparison to push the switching element, change the switching element on and off state, to control the measured pressure purposes.
