by Fmeaddons

LEL / O2 or CH4 / 02 for LNG, LPG, & cude oil tankers.


  • Available to measure from higher concentration (vol%) to lower concentration (%LEL)
  • Explosion proof (Detector: Explosion proof, other electrical circuit and pump, intrinsically safe design)
  • Available to measure HC/O2, CH4/O2 in N2, inert gas and air with a reliable NDIR method

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This model has two versions and is a combination type portable HC/O2 or CH4/O2 gas detector with an Infrared (NDIR) type sensor and galvanic cell type sensor. These sensors provide accurate detection of HC/O2 (HC version) or CH4/O2 (CH4 version) levels even in N2 and other inert environments. The measuring ranges are 0-100%LEL/0-100 vol% for HC or CH4 and 0-25 vol% for )2 respectively with automatic ranging. The RX-415 has explosion proof and intrinsically safe construction so that it can be used safely in any environment.


  • Measures gas concentrations in tank of LNG and LPG carriers
  • Measures gas concentrations in crude oil tankers
  • Measures gas concentration in inert gas generating system (IGS)



RX-415 (HC version) RX-415 (CH4 version)
Gas Detected


Oxygen (O2)


Oxygen (O2)
Detection Principle NDIR (Non-Dispersive infrared) Galvanic cell NDIR (Non-Dispersive infrared)

Galvanic cell
Detection Range (Increments) 0~100%LEL
0-100vol% (0.5%vol/digit)
(auto range)
0-25 vol% (0.1%vol/digit) 0~100%LEL
0-100vol% (0.5%vol/digit)
(auto range)
0-25 vol% (0.1%vol/digit)
Sampling Method Built in sample pump
Response Time
Within 30 seconds (T90)
Ambient Temp/ Humidity

-10°C ~ + 40°C(14 to 104°F), below 90%RH, non-condensing
Continuous Operation Approx. 40 hours (no alarm or light, at 20ºC)
Power Source 4 “C” Alkaline dry cell batteries or optional Ni-Cad
Dimensions & Weight Approx. 80 (H) x 200 (W) x 142 (D) mm (3.1” H x 7.9” W x 5.6″ D), approx. 2 kg (4.4 lbs)
Standard Accessories
      Filter tube with flow monitor
      Connection tube (green)
      Spiral sampling tube
      Gas sampling probe
      Carrying case with shoulder strap
      Alkaline battery (4 “C” size)
    Operation manual
Optional Accessories
      Sampling tube (30M)
      Gas sampling bag
    Ni-Cad battery charger

Specifications subject to change without notice.


LEL / O2 or CH4 / 02 for LNG, LPG, & cude oil tankers.