dumb question but does this only detect proximity of metal or magnetic device or would it detect a human finger being used as no-touch switch?

Metal only. It does detect any metal however.

It is sealed and stainless so it is very water resistant. It's not made to be submersed in water, though it could last for a time underwater. The sensor can take a light stream of water, but would likely fail under high pressure washdown over time.

How sensitive is this switch to aluminum? 4mm? 2mm? Thanks

Distance or thickness of material? I was able to trip it with a small aluminum tube but it had to make physical contact with the center of the switch.

it is assumed sensor has voltage applied; is sensor closed then opens when tripped?

Depends on if it a normally open or normally closed sensor.

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Taiss 2pcs LJ12A3-4-Z/AX Proximity Switch Inductive Proximity Sensor Detection Switch NPN NC DC 6V-36V 4mm Normally Close 6-36V

Product ID: 87479566

📏4mm precise detection range

🔋Wide 6-36V DC voltage compatibility

⚙️300mA robust output current

€ 27.59

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Description

⚡ Stay ahead with precision sensing that powers your smart workspace!

PLUG PLAY WIRING - Clear 3-wire color-coded system (Brown, Blue, Black) for effortless integration.
DURABLE METAL SHELL - Rugged cylinder design with metal casing ensures long-lasting industrial-grade reliability.
TWIN PACK ADVANTAGE - Two sensors included to double your efficiency and reduce downtime.
PINPOINT PRECISION DETECTION - Detects iron objects within a sharp 4mm range for flawless automation.
UNIVERSAL VOLTAGE FLEXIBILITY - Operates seamlessly across a broad 6-36V DC spectrum to fit diverse setups.

The Taiss LJ12A3-4-Z/AX is a high-performance inductive proximity sensor featuring a 4mm detection distance, NPN normally closed output, and wide 6-36V DC voltage compatibility. Its durable metal shell and straightforward 3-wire connection make it ideal for industrial automation tasks requiring reliable iron object detection. This pack includes two sensors, perfect for scaling your projects with confidence.

Specifications

ASIN	B073XDKM9S
Best Sellers Rank	#79,352 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Inductive Proximity Sensors
Date First Available	July 14, 2017
Item Weight	3.17 ounces
Item model number	JJ-0021
Manufacturer	Taiss
Package Dimensions	4.45 x 3.23 x 0.98 inches

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