The GX-3R Pro is RIKEN KEIKI’s ultra-compact intrinsically safe personal 5-gas portable multi-gas monitor, engineered for confined space entry, industrial site safety, and personal gas hazard detection. It is recognized as one of the world’s smallest and lightest 5-gas detectors, built with in-house high-performance R-series sensors and equipped with BLE Bluetooth wireless communication for real-time remote safety management RIKEN KEIKI GmbH.

It supports simultaneous measurement of up to 5 gases: standard LEL (combustible), O₂, CO, H₂S, plus an interchangeable 5th toxic/infrared sensor (CO₂, SO₂, HCN, NO₂, NH₃, PH₃ optional). Diffusion sampling is standard; external RP-3R aspirating pump is available for remote sampling of confined spaces, pipes, and hard-to-reach areas.

• Dimension & Weight: 73(W) * 65(H) * 26(D) mm; only 120 g with rechargeable lithium battery (140 g with alkaline batteries) RIKEN KEIKI GmbH
• Housing Protection: IP66/IP68 equivalent dustproof & waterproof; shock-resistant rubber bumper, passes 7-meter free drop test
• Explosion Safety Certification: Intrinsically safe design, ATEX II1G Ex da ia IIC T4 Ga / IECEx Ex da ia IIC T4 Ga, compliant with global industrial hazardous zone standards RIKEN KEIKI GmbH
• Power Supply Options:
  1. Rechargeable Li-ion pack: 3-hour full charge, up to 40 hours continuous runtime under long-life mode
  2. Disposable 2* AAA alkaline batteries
• Operating Environment: -40°C ~ +60°C, 0–95% RH non-condensing humidity
• Display & Operation: Backlit rotating LCD screen, only two physical buttons (AIR zero / POWER MODE); supports 11 global display languages
• Alarm System: Triple alarm cues – 95dB loud buzzer at 30cm, dual side flashing LED lights, built-in vibration alert; supports gas alarm, fault alarm, man-down alarm, panic emergency alert RIKEN KEIKI GmbH
• Data Storage & Communication: Built-in data logger stores 3,600 measurement records; IrDA infrared port for PC data export; low-power BLE Bluetooth paired with free RK Link mobile App (iOS/Android)
• Warranty: 3-year full warranty for the instrument and factory sensors

• LEL Combustible Gas: New ceramic catalytic bead sensor, compatible with 27 types of combustible gases with pre-stored correction factors
• O₂ / CO / H₂S: Miniature 2-in-1 electrochemical composite sensor, greatly reduced overall size
• CO sensor: Optimized dual-cell structure to minimize hydrogen cross-interference
• Optional 5th channel: Infrared CO₂ sensor or high-precision electrochemical toxic gas sensors (SO₂, HCN, NO₂, etc.)
• All sensors are field-replaceable without professional tools, lowering maintenance downtime

1. BLE Bluetooth & RK Link App Remote Management

   Real-time push of all alarm signals to paired mobile phones; auto-send emergency alert emails to pre-registered contacts during gas, man-down or panic events. Users can remotely adjust alarm thresholds, calibration schedules, display language and check device status via the App.

2. Man-Down & Panic Emergency Alert

   Automatic trigger of full alarm sequence if the operator remains stationary for a preset time; one-touch panic button for active emergency reporting to supervisors remotely.

3. Complete Safety Monitoring Logic
   • TWA/STEL & peak value retention (data saved even after power off via lunch break function)
   • Calibration & bump test reminder notification upon power-up
   • Interval normal operation confirmation beep to verify device working status
   • Customizable alarm setpoints matching site safety regulations
4. Robust Industrial Usability

   Stainless steel alligator clip included for secure mounting on safety vests, collars within the OSHA-defined breathing zone; replaceable filter caps block dust and moisture to extend sensor service life. Compatible with SDM-3R automatic docking station for one-click auto zero, bump test and span calibration to simplify daily maintenance workflows.

1. Ultra-miniature & Lightweight Ergonomic Design

   Palm-sized, lighter than most smartphones, zero obstruction to field work; wearable on personal PPE without fatigue during long shifts.

2. All-Weather Rugged Construction

   IP68 water submersion resistance, wide extreme temperature range, and certified 7m drop resistance deliver stable performance in rain, damp confined spaces, cold storage and high-temperature industrial workshops.

3. Flexible 5-Gas Custom Configuration

   Modular 5th toxic/IR sensor slot adapts to diverse scenarios: confined space entry, chemical plant gas monitoring, waste water treatment, boiler CO₂ detection, and toxic fume inspection.

4. Wireless Team Safety Visibility

   Industry-standard Bluetooth remote alarm notification enables real-time team hazard tracking, greatly improving response speed for confined space and lone worker safety management.

5. Low Total Cost of Ownership

   3-year long warranty, field-replaceable sensors, long battery runtime, and automatic calibration docking station compatibility cut labor and replacement costs over the device lifecycle.

Confined space entry (tanks, sewers, vaults), oil & gas refineries, chemical manufacturing, wastewater treatment plants, construction excavation, boiler & combustion equipment inspection, shipyard & marine operations, lone worker safety monitoring, industrial plant routine gas patrol.