Normally Open (NO) refers to the state of an electrical switch contact which stays open until a preset threshold has been met and the switch closes, e.g. a NO pressure switch set at 10 bar will close once the pressure exceeds 10 bar.
Alarm relay settable measurement products
- Alarm Relay Output Process Indicators
- Email notifying multiple 4m high water tanks level controller
- 25m borehole submersible pump level indicator and control switch with level sensor
- Wind power barometric pressure visual monitor with alarm relay switches