The RD-3 Plus Series Hydrogen Leak Detector (hereinafter referred to as 'the Device') is a portable ppm-level hydrogen detection instrument supporting both Bluetooth and USB communications. It enables wireless data transmission to mobile apps over short distances, as well as real-time interconnection with PC software (Note: The RD-3 Plus-B model temporarily does not support this feature. For detailed specifications, please refer to the 'Technical Parameters' section).

This device allows monitoring personnel to track hydrogen concentration values and variation curves at potential leak points in real-time via portable smart devices. By setting alarm thresholds, users can promptly receive alerts to facilitate rapid response. It also supports data recording, storage, and download functions for subsequent analysis.

The device meets requirements for continuous online micro-leak hydrogen detection across various hydrogen industrial environments and special conditions. It is widely applicable in hydrogen system test benches, fuel cell production lines, hydrogen-related laboratories, and similar scenarios.

▎Key Features ：

1.Micro-leak detection: Minimum detection limit of 1 ppm.

2.Second-level response: Utilizes high-reliability sensor technology and pump suction sampling to ensure rapid gas leak capture.

3.Four-stage audible & visual alarm: Features auxiliary alarm threshold LED display with progressive alarm points at 10 ppm, 100 ppm, 1000 ppm, and 1% Vol.

4.Customizable alarm thresholds: Users can set and modify the detector's alarm thresholds based on on-site monitoring requirements.

5.Data transmission function: Enables real-time viewing, recording, and downloading of detection data via mobile app or PC software for remote operation.

6.Data recording, storage, and download functions: Supports onboard measurement data logging and export for user analysis.

7.Multi-mode display: The PC software can simultaneously display concentration values and curves for multiple hydrogen leak points, with manual cycling between points. Configurable display of max/min values, point names, and historical trend graphs.

▎Technical Specifications ：

Parameter Name	Parameter Value	Parameter Value
Model	RD-3 plus-B	RD-3 plus
Target Gas	Hydrogen (H₂)	Hydrogen (H₂)
Detection Method	Diffusion	Pump suction
Detection Range	(0~5000) ppm	(0~1000) ppm; (0.1~4) %Vol
Max. Permissible Error	±30%	±30%@ (0~1000) ppm ±5%FS@ (0.1~4) %Vol
Response Time	<2s	<1s
Resolution	1ppm	1ppm; 0.01%Vol
Operating Time	＞8h	＞6h
Communication & Data Export	None	Direct USB connection for real-time data reading/storage/export (Excel)
Wireless Data Transmission	None	Bluetooth＜10m
Photo Documentation	None	Sync mobile device photos with corresponding detection data
Display	HD color LCD, 4-button operation Chinese/English switchable (default:Chinese)
Power Supply	Lithium battery (3.6~4.2) V
Charger	Type-c interface, 5V/1A standard charger
Warm-up Time	60s
Operating Temperature	(-20~+55) ℃
Storage Temperature	(-20~+60) ℃
Operating Humidity	(20~80) %RH (non-condensing)
Dimensions	Probe length 320mm, 169 mm × 60 mm ×28 mm (L×W×H)
Weight	Approx. 400g
Explosion-proof Rating	Ex ib IIC T3 Gb

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▎Product Introduction ：