Catalog

DT-824S – Compact Non Linear Junction Detector

DT-824S is a latest NLJD model of detectors series DT with latest technology and software integrated. It can detect electronic devices hidden in walls, floors, ceilings, lamps, furniture or containers, switched on or off, by display, sound and vibration.

DT-824S is an advanced handheld nonlinear junction detector (NLJD) with compact design, released in 2025. It adopts self-developed nonlinear harmonic technology, combined with non-destructive detection and a precise phase algorithm. This NLJD also supports time-domain harmonic peak mode and harmonic audio mode functionality, giving better analysis of the target items. It can detect any electronic devices concealed in packages, walls, floors, ceilings, lamps, furniture, or containers, regardless of whether the devices are powered on or off, emitting signals or not. DT-824S is ideal for a wide range of applications, including electronic explosive detection, confidentiality inspections, and identifying prohibited items in correctional facilities.

While most handheld NLJDs in the market offer a standard sensitivity of -110 dBm to -125 dBm, this device was engineered to a higher professional standard. By achieving a receiver sensitivity of -140 dBm, the DT-824S provides operators with a significantly enhanced detection capability. This allows for the reliable identification of smaller, more distant, or well-shielded electronic devices, ensuring a more thorough and dependable security sweep.

Application

• It can be widely used in government, public security, prison, justice, army, education examination, business security and personal privacy protection, etc.
• Business Safety: Detecting unauthorized electronic devices, such as eavesdroppers, mobile phones and devices with SIM cards, hidden in company boardrooms or secret offices.
• Public Safety: Detecting electronic devices hidden or prohibited from use in safe areas, such as detonators, remote controllers, etc.
• Personal Privacy Protection: Hidden cameras and surveillance devices such as recording pens, cameras, etc. in residential buildings and hotels.

Competitive advantages
• Ultra-small size and weight
• High detection sensitivity

• Enhanced audio demodulation channel
• Optimized response in false electronics indication
• Supports harmonic amplitude time domain curves and audio analysis functions
• Strong environmental adaptability and stable operation in various environments
• Good ergonomic design makes it easy to hold and work in long operations

Technological advantages
• Adopts NLJD technology to determine the degree of non-linearity of the target object
• Adopts the harmonic time axis waveform display and audio demodulation to determine junction type of the target object
• Utilizes high-gain, high-concentric, circularly polarized antenna to optimize performance

Technical Specifications
Transmitting Frequency range	2.404 GHz – 2.472 GHz
Receiving 2nd Harmonic	4.808 GHz – 4.944 GHz
Receiving 3d Harmonic	7.212 GHz – 7.416 GHz
Pulse Mode Transmit Power (Maximum)	0-2 W (ERIP)
Receiving sensitivity	≤ -140 dBm
Receiving dynamic adjustable range	50 dB
Operation Time in Max Power Pulse Mode	> 4 h
Battery type	Non-replaceable Lithium Battery 4500 mAh
Charging time	Fast charging 3 hours
Interactive interface	LCD Displays: – Harmonic Signal Intensity – Detection Result Icon – Time-domain Harmonic Peak Graph – Harmonic Audio Graph Audio prompts through internal loudspeaker or headphone
Protection grade	IP65
LCD Display	2.4-Inch TFT
Product size	L227 x W112 x H70 mm
Outer box size	L580 x W300 x H150 mm
Product weight, main unit/full set	500 g / 2.69 Kg
Working temperature	-30 ^oC … +55 ^oC
Working humidity	No more than 93%, no condensate
Protection level	IP65

Catalog

DT-824S – Compact Non Linear Junction Detector

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