I see 4 to 5 wires. Can you just power and the sensor will turn off(or on) power when liquid is no longer detected.

It's an active sensor, so power must be applied to the power wire all the time for the output to activate. For a passive switch, you might consider something like a float switch that completes a circuit when the float goes up due to water. (https://www.amazon.com/Anndason-Pieces-Plastic-Switch-Liquid/dp/B072QCHQ2P/ref=sr_1_4_sspa?dchild=1&keywords=float+switch&qid=1618229140&sr=8-4-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzM0FSQlUyOVE1WkJQJmVuY3J5cHRlZElkPUEwMjc0MjUxMkFPVEpRUDNCWENNViZlbmNyeXB0ZWRBZElkPUEwNTg2MDAzMkYxRFdGTlo4NEFIQyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=).

If I use it for aquarium how it works? I need to trigger an alarm when the water level comes lower than the sensor.

Or you can drive directly your filing pump control.

Is there a version of this that works for metal containers ?

yes, PLS refer the following type https://www.amazon.com/dp/B07Z66RJWF?ref=myi_title_dp&th=1

will this work on the outside of 1/2" (13mm) OD silicone tubing ?

I guess so : i’am using a 20mm silicone tube and it works fine. It also works when my finger get close to it : close from your 13mm diameter.

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Taidacent Non-Contact Liquid Level Sensor Contactless Water Level Sensor Externally Attached Liquid Induction Level Switch Water Level Switch (PNP Output(5-12V))

Taidacent Non-Contact Liquid Level Sensor Contactless Water Level Sensor Externally Attached Liquid Induction Level Switch Water Level Switch (PNP Output(5-12V))

Product ID: 146190033

⚡5-24V wide voltage range

📡20mm sensing distance

🔄Multi-output modes (PNP, NPN, RS485)

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Description

🚀 Elevate your liquid sensing game with precision and zero-contact confidence!

FLEXIBLE OUTPUT OPTIONS - Supports PNP, NPN, RS485, and open collector outputs to integrate effortlessly with your existing systems.
UNIVERSAL COMPATIBILITY - Works seamlessly with plastic, glass, ceramic containers and detects liquids, powders, and particles.
SMART LIQUID LEVEL MEMORY - Remembers and adjusts liquid reference points for consistent, reliable monitoring every time.
TRUE NON CONTACT DETECTION - Breaks container wall barriers for precise liquid level sensing without any physical contact.
ROBUST INTERFERENCE IMMUNITY - Engineered to resist electromagnetic and power frequency noise, ensuring stable readings in any environment.

The Taidacent Non-Contact Liquid Level Sensor leverages advanced signal processing and a high-speed chip to deliver accurate, contactless liquid level detection through various non-metallic containers up to 20mm thick. Featuring intelligent liquid level memory, multi-output modes including PNP and RS485, and a wide voltage range (5-24V), it offers robust interference resistance and broad compatibility for industrial and home applications.

Specifications

ASIN	B07QH9CFFM
Best Sellers Rank	#188,212 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #77 in Liquid Level Sensors
Date First Available	April 10, 2019
Item Weight	1.58 ounces
Item model number	Y25-1904
Manufacturer	Taida Century Technology
Package Dimensions	6 x 4 x 0.3 inches

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€ 38.15

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