--- product_id: 118204514 title: "Twidec/10mm Hall Effect Proximity Sensor Inductive Switch NPN NO（Normally Open) with Magnet DC5-30V NJK-5002C" price: "£11.13" currency: GBP in_stock: true reviews_count: 11 url: https://www.desertcart.co.uk/products/118204514-twidec-10mm-hall-effect-proximity-sensor-inductive-switch-npn-no store_origin: GB region: United Kingdom --- # Wide 5-30VDC supply voltage 10mm precise detection range LED output indicator Twidec/10mm Hall Effect Proximity Sensor Inductive Switch NPN NO（Normally Open) with Magnet DC5-30V NJK-5002C **Price:** £11.13 **Availability:** ✅ In Stock ## Summary > 🔍 Detect with precision, connect with confidence! ## Quick Answers - **What is this?** Twidec/10mm Hall Effect Proximity Sensor Inductive Switch NPN NO（Normally Open) with Magnet DC5-30V NJK-5002C - **How much does it cost?** £11.13 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/118204514-twidec-10mm-hall-effect-proximity-sensor-inductive-switch-npn-no) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart NPN Output:** Normally open NPN three-wire output integrates effortlessly with logic circuits. - • **Built-in LED Indicator:** Red LED signals detection status instantly, minimizing troubleshooting time. - • **Compact & Durable Design:** Robust metal body with copper-plastic components ensures longevity and easy installation. - • **Precision Metal Detection:** Accurately senses metal objects within a 10mm range for reliable proximity alerts. - • **Versatile Voltage Compatibility:** Operates seamlessly from 5 to 30VDC, fitting diverse industrial setups. ## Overview The Twidec NJK-5002C Hall Effect Proximity Sensor is a compact, metal-bodied inductive switch designed for precise metal detection up to 10mm. Operating across a broad 5-30VDC range, it features a normally open NPN output compatible with TTL and MOS logic circuits. Its built-in red LED indicator provides immediate feedback, making it ideal for high-frequency industrial applications requiring reliable, long-lasting sensing solutions. ## Description Model: NJK-5002C;Supply voltage:5-30VDC ;Detection distance:10mm (effective detection distance 0-10mm);Load current :150MA (no more than) ;Output form:NPN three lines Output state normally open (NO);Detect objects:metal material;Features: magnetic induction input,digital voltage signal output Wide supply voltage range High frequency Long life,small volume,convenient installation Can directly connect the transistor and TTL,MOS and so on logic circuit Review: Proper orientation of magnet… - There is a correct way to orient the Manet to the sensor. A review was written using a ferrous magnet and the orientation of the magnet was incorrect. The field of the magnet is weakest on the side and therefore would reduce the ‘sensitivity’ of the sensor. If they would have used either flat side of the magnet the field strength would increase and the detection distance would have been greater. In addition, a neodymium magnet has a higher field strength than a ferrous based magnet thereby increasing the detection distance. These devices have about a 10mm ( ~3/8”) detection distance maximum. I have used these in several applications using a neodymium magnet and run about a 5mm (~3/16”) gap. Works great on the application running around 1,000 RPM. So take it for what it’s worth, a great little sensor package. WORD OF CAUTION: This sensor is sensitive tp the magnet orientation. North versus South Pole. The magnets are NOT market and the only way to know which side of the magnet will cause the sensor to trip is to hook one up and check the light on the back of the unit. You only need to hook up BROWN to Positive and BLUE to Negative. Use a small 12 VDC battery and pass the fat side of the magnet close to the sensor end. If the light on the back does not come on then flip the magnet over and try again. Verify which side of the magnet will cause the sensor to 'trip' and mark it so you know which side to present to the sensor. Review: works with RacePak data logger - I am using this with a RacePak Sportsman data logger. So far it is working fine reading my driveshaft RPM. The one thing that screwed me up is the wire they call brown actually looked red to me. ## Features - Model: NJK-5002C Supply voltage : 5-30VDC; Detection distance :10mm (effective detection distance 0-10mm) ; - Output : NPN three lines Output state normally open (NO) - Thread Diameter: 12MM ; thread length: 32MM；Load current :150MA (no more than) - Detect objects ：metal material ；Product Material: Metal ;parts: Copper plastic components;PBT External leads:1.2 m (standard, others according to customer requirements) ;Output indication:LED (red); - Net Weight : 50g ;Package Content : 1 x Hall Effect Sensor ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.1 out of 5 stars 103 Reviews | ## Images ![Twidec/10mm Hall Effect Proximity Sensor Inductive Switch NPN NO（Normally Open) with Magnet DC5-30V NJK-5002C - Image 1](https://m.media-amazon.com/images/I/51LViVh0BJL.jpg) ## Questions & Answers **Q: is this omnipolar, unipolar or bipolar?** A: Unipolar only **Q: Can this sense a strip of magnetic tape?** A: Theoretically yes, if it's the proper polarity as this only detects a single polarity and ignores the other. **Q: Is there any reason why this would not work with an ebike controller in place of the typical external hall speed sensor?** A: This is just on/off, I suspect the hall speed sensor is more complicated than that. But if you're replacing a single on/off sensor, and can provide the proper power to it... and the controller only needs the single signal wire... it may work. **Q: Is the provided magnet necessary to register a reading? What is the detection distance when working with materials such as aluminum and steel?** A: This can only sense the magnet ## Customer Reviews ### ⭐⭐⭐⭐⭐ Proper orientation of magnet… *by J***S on November 18, 2024* There is a correct way to orient the Manet to the sensor. A review was written using a ferrous magnet and the orientation of the magnet was incorrect. The field of the magnet is weakest on the side and therefore would reduce the ‘sensitivity’ of the sensor. If they would have used either flat side of the magnet the field strength would increase and the detection distance would have been greater. In addition, a neodymium magnet has a higher field strength than a ferrous based magnet thereby increasing the detection distance. These devices have about a 10mm ( ~3/8”) detection distance maximum. I have used these in several applications using a neodymium magnet and run about a 5mm (~3/16”) gap. Works great on the application running around 1,000 RPM. So take it for what it’s worth, a great little sensor package. WORD OF CAUTION: This sensor is sensitive tp the magnet orientation. North versus South Pole. The magnets are NOT market and the only way to know which side of the magnet will cause the sensor to trip is to hook one up and check the light on the back of the unit. You only need to hook up BROWN to Positive and BLUE to Negative. Use a small 12 VDC battery and pass the fat side of the magnet close to the sensor end. If the light on the back does not come on then flip the magnet over and try again. Verify which side of the magnet will cause the sensor to 'trip' and mark it so you know which side to present to the sensor. ### ⭐⭐⭐⭐ works with RacePak data logger *by O***! on October 20, 2025* I am using this with a RacePak Sportsman data logger. So far it is working fine reading my driveshaft RPM. The one thing that screwed me up is the wire they call brown actually looked red to me. ### ⭐⭐⭐⭐⭐ Works great *by S***S on September 15, 2025* Works great and arrived on time ## Frequently Bought Together - Twidec/10mm Hall Effect Proximity Sensor Inductive Switch NPN NO（Normally Open) with Magnet DC5-30V NJK-5002C - DIGITEN Hall Sensor Proximity Switch NPN 3-Wires Normally Closed NC with Magnet - Twidec/M12 Approach Sensor Inductive Proximity Switch NPN NO DC 6-36V, 4mm Detecting Distance LJ12A3-4-Z/BX --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/118204514-twidec-10mm-hall-effect-proximity-sensor-inductive-switch-npn-no](https://www.desertcart.co.uk/products/118204514-twidec-10mm-hall-effect-proximity-sensor-inductive-switch-npn-no) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-21*