RKI Instruments 03 Series LEL Single Gas Monitor 72-0037

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RKI's O2, CO, and H2S version Gas Monitors can be operated continuously for at least 3,000 hours on (2) AAA size alkaline batteries. The GP-03 operates for 35 hours on alkaline and 30 hours on rechargeable Ni-MH. The 03 models have 2 preset alarms that are user adjustable. Each version is also equipped with visual, audible, and vibration alarms as standard. The RKI 03 Series Monitors are great in areas of hazardous material, mining, tunnels, refineries or petrochemical, water and wastewater treatment, pharmaceuticals, utilities, chemical plants and fire services.

Applications: Hazardous material, Mining, Refineries/petrochemical, Water/wastewater treatment, Pharmaceuticals, Utilities, Chemical plants, Fire services

Key Features:

  • Pocket size 2.1 in. (W) x 2.6 in. (H) x 0.9 in. (D)
  • Lightweight (2.8 oz.)
  • Impact, dust, and water resistant (IP-67)
  • Replaceable rubber boot
  • Data log from 5 to 300 hours with adjustable intervals
  • Audible / visual / vibration alarms
  • Automatic backlight
  • Low battery alarm


  • Combustible gas
  • Detection principle: Catalytic combustion
  • Detection range: 0 ‰ÛÒ 100 percent LEL
  • Alarm set points: 1st - 10 percent LEL 2nd - 50 percent LEL Over - 100 percent LEL
  • Alarm types: Gas alarms: 1st and 2nd (user adjustable), OVER alarm, STEL and TWA Trouble alarms: Sensor connection, low battery circuit failure, and calibration range error
  • Gas sampling: Diffusion
  • Response time: T90 in 30 seconds
  • Accuracy: 0.5 percent of reading or å± 2 ppm LEL
  • Data logging: 10 second intervals = 5 hours, 5 minute intervals = 150 hours, 10 minute intervals = 300 hours Instrument records alarms, alarm trends, gas readings, calibration & bump test history, instrument information and settings
  • Safety rating: ATEX/IECEx approved. CSA classified, ‰ÛÏC/US‰Û, as intrinsically safe, Class I, Division 1, Groups A, B, C, D (pending)
  • Enclosure: Dust and water resistant with IP-67 rating
  • Display: Digital LCD, gas name & concentration, auto backlighting during alarm, operation icon, battery icon
  • 2 year warranty

Monitor Includes:

  • Rubber protective boot
  • Alkaline batteries
  • Alligator clip
  • Wrist strap
  • Data log software

Part Numbers:
72-0037 - Monitor only 72-0037-05 - LEL-03 Monitor with alligator clip, alkaline batteries and calibration cup
72-0037-50 - Kit - LEL-03 Monitor with Accessory Cs Kit (alkaline batteries, screwdriver, and small padded case)
72-0037-56 GP-03 - Gas Monitor, Accessory CS Kit (alkaline batteries, screwdriver, case) and Calibration Kit (gas, regulator, calibration cup and tubing)

Additional Details:

0.70 LBS
8.50 (in)
1.00 (in)
12.00 (in)
Calculated at Checkout
Gas Type: