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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🚀 Elevate your liquid level sensing game—contactless precision that keeps you ahead!

FLEXIBLE OUTPUT MODES - Supports NPN, PNP, RS485, and open collector outputs to integrate effortlessly with your existing systems.
UNIVERSAL COMPATIBILITY - Works seamlessly with plastic, glass, ceramic containers and various liquids, powders, and particles.
SMART LIQUID LEVEL MEMORY - Remembers and adjusts liquid reference points for consistent, reliable monitoring.
TRUE NON CONTACT DETECTION - Breaks container wall barriers for precise liquid level sensing without direct contact.
ROBUST INTERFERENCE IMMUNITY - Engineered to resist electromagnetic, power frequency, and common mode interference for stable performance.

The Taidacent Non-Contact Liquid Level Sensor leverages advanced signal processing and a high-speed chip to deliver precise, contactless liquid level detection through non-metallic container walls up to 20mm thick. Featuring intelligent liquid level memory, multi-point series connectivity, and versatile output options (NPN, PNP, RS485), it ensures robust, interference-resistant performance across a wide voltage range (5~24V). Ideal for professional applications requiring reliable, adaptable, and maintenance-free liquid monitoring.

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Brand	Taidacent
Manufacturer	Taida Century Technology
Country of Origin	USA
Model number	Y25-1904
Item Weight	45 g
Package Dimensions	15.24 x 10.16 x 1.27 cm; 45 g
Item model number	Y25-1904
Are batteries included?	No

Taidacent Non-Contact Liquid Level Sensor Contactless Water Level Sensor Externally Attached Liquid Induction Level Switch Water Level Switch (NPN Output(24V))

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