Sampling method	Diffusion type/Double type
Principle of detection	New Ceramic catalytic Method, Non-Dispersive Infrared Method, Potentiostatic Electrolysis Method
Detection range	Depend on target gas.
Type of alarm	Gas alarm / fault alarm [option] panic alarm / man down alarms
Display of alarm	Flashing light / buzzer / vibration
Explosion protected construction	Intrinsic safety
Explosion-proof class	IECEx : Ex da ia IIC T4 Ga / Ex da ia I Ma ATEX : II1G Ex da ia IIC T4 Ga / IM1 Ex da ia I Ma *With combustible gas sensor
Ingress proof rating	IP66/68
Approvals	Japan Ex, ATEX, IECEx, Brazil Ex, China Ex, MED, EN 60079-29-1, EN 50104, JIS, JG, EN 45544
CE marking	EMC / ATEX / RoHS / RE
Power source	Lithium ion rechargeable battery unit or Dry battery unit (AAA alkaline battery×3)
Continuous operation	Approx. 40 hours (with long battery mode) *Depends on sensor type
Dimensions	Approx. 73 (W) × 65 (H) × 26 (D) mm [Rechargeable battery] Approx. 73 (W) × 65 (H) × 34 (D) mm [Alkaline battery]
Weight	Approx. 120 g [Rechargeable battery] Approx. 140 g [Alkaline battery]
Operating temperature range	-40 ℃ to +60 ℃ (no sudden changes)
Operating humidity range	0 to 95 %RH (no condensation)

Riken Keiki Portable Gas Monitor GX-3R series