Dry contact optical relay closure Dry contact closure relay to fiber optic converter
- Laminar flow created in pipe to allow it to be read by air flow sensor (wet contact circuit)
- The air flow sensor's output would send a signal to a passive/dry contact optical relay.
- The input-side relay took the LED signal from the pipe and transported it via optic fiber to a MOSFET in another area of the factory.
An optical relay uses an LED on the input side. MOSFET Private or Broken Links
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s (metal-oxide-semiconductor field-effect transistor) are on the output side and an array of photosensors in between. Used in solid-state relays, where there are fewer moving parts, meaning more resilient. Low power consumption, low leakage current, long life, high reliability, fast switching, vibration and shock resistance
Dry contact -no voltage or potential difference between two contacts. AKA a volt free contact or potential-free contact
- Passive contacts
- Dry because does not use "mercury wetted contacts"
- Power isn't directly supplied by a switch, it's constantly supplied by another circuit.
- Provide complete isolation between devices. Doesn't break the primary circuit.
- Primarily used in low voltage (<50 V) AC distribution. Also used to monitor fire alarms, burglar alarms, and alarms that use power systems
- Used in relay circuits because the relay does not supply intrinsic power to the contact
- Main advantage - isolating devices, providing a wide variety of output voltage levels
Wet Contact
- POwer is supplied by the same power source as the control circuit
- Operates like a controlled switch
- Can be referred to as the primary set of contacts. Provides the same power for controlling the device.
- Hot contacts or active contacts
- Used in control circuits where power is intrinsic to the device to switch teh contacts (control panel, temp sensors, air-flow sensor)
- Main advantage - troubleshooting between devices. Simpler wiring and voltage level
A thermostat is the most common example of a wet contact. A thermostat has the same power supply to power the control and its contact, it means that the power supply directly provides power to the control circuit and its contact.
Wet contacts are commonly found in solid-state switching’s, such as proximity sensors, temperature sensors, and [air-flow sensors], in which the same voltage levels are provided to the sensor and the load, no extra common power wires are required, also the power consumption of the sensor and the load is very small.