by Fmeaddons

LNG Carrier Storage Vessel Gas Monitor


  • Dual range detection of CH4 or HC in %vol and %LEL.
  • Unique gas combinations include: CH4/O2/CO/CO2/HC/O2/H2S
  • Accurately measure CH4 or HC from inerted tanks with infrared sensor.
  • High range H2S 0-1,000ppm available (RX-517).
  • Intrinsically safe design.
  • Datalogging (Max 30 hours of interval trend).

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The LNG Carrier model is a combination type portable CH4, O2, CO and CO2 gas detector with an Infrared (NDIR) type sensor, galvanic cell type sensor and Electro-chemical cell type sensor. These sensors provide accurate detection of CH4, O2, CO and CO2 levels even in N2 and other inert environemnts. The measuring ranges are 0-100%LEL / 0-100%vol for CH4, 0-25%vol for O2, 0-1000ppm for CO and 0-20.0%vol for CO2 respectively. The RX-515 has an explosion proof and Intrinsically Safe design so that it can be used safely in any environment.



  • LNG Carrier Storage Vessel gas monitoring



Gas Detected

Methane (CH4)

Oxygen (O2)

Detection Principle NDIR Galvanic cell Electro-chemical cell

Detection Range (digit) 0~100%LEL
5-100%vol (0.5%vol)
0-25 vol% (0.1%vol) 0-1000 ppm
0-2%vol (.01%)
2-5%vol (.05%)
5-20%vol (.1%)
Operating Temp. & Humidity

-10°C ~ + 50°C (14 to 122°F),
below 90%RH, non-condensing
Safety Rating
Exiad II BT3X (Alkaline batteries “Size C” only), KIMM approved,
MED approved, with “Wheel mark”
(Certificate No. 15520/A0EC)
Power Source 4 “C” Alkaline dry cell batteries
Continuous Operation Approx. 30 hours (no alarm or light, at 25ºC)
Display Digital LCD (with back light)
Alarm Types
    Gas Alarms: Standard …OFF
    (optional ..1st and 2nd user adjustable, self-resetting)

    Trouble Alarms (self diagnosis): Sensor connection, low battery, circuit trouble and calibration error

Dimensions & Weight Approx. 80 (H) x 200 (W) x 142 (D) mm (3.1” H x 7.9” W x 5.6″ D), approx. 1.8 kg (4 lbs)
Special Functions
Peak hold, Datalogging
Standard Accessories
    Carrying case with shoulder strap
    Filter tube with flow monitor and junction tube
    Gas sampling hose
    Gas sampling probe
    Alkaline battery (4 “C” size)
    CO2 scrubber
    Instruction manual

Specifications subject to change without notice. 


RX-515, RX-516, RX-517 Software



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