GMI First Responder Portable Gas Detector

Code: 44526G
  • Flammable gas (PPM, LEL, Volume)  & CO
  • Simple four-button operation
  • Rechargeable or alkaline battery

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Combination Instrument for First Call and Emergency Response Technicians. The GMI First Responder is a combustible gas indicator designed for emergency response technicians in the gas industry. This instrument combines quality, ruggedness and advanced GMI Technology in a user-friendly, portable gas detector.


  • PPM, LEL and Volume flammable gas ranges for leak detection and general safety monitoring.
  • Carbon Monoxide range for internal atmosphere monitoring.
  • Probe-mounted Semiconductor Sensor (Range 0 – 10,000 ppm), providing instant response leak detection with audible/visual ticker (Geiger) alarm indication.
  • Automatic and manual data logging.
  • Integral pump.
  • A comprehensive range of probes and accessories are available.
  • Rugged polypropylene case, sealed to IP54 rating.
  • Approvals ATEX, IECEx, China Ex. US Approvals: CSA, FM,  ETL, UL.


Dimensions: 180 x 95 x 105 mm / 7.1 x 3.7 x 4.1in.
Weight: 1.7 kg / 3.75 lbs
Display: LCD with automatic backlighting
Humidity: 0-95% R.H. non-condensing
Temperature: -20oC to +50oC (-4oF to +122oF)
Alarms: Highly visible flashing LED.
Sounder: In excess of 80dB(A), typically 85db(A) @ 1m.
Ticker (Geiger) in ppm Flammable and EXT ranges
Datalogging: Both automatic and manual
Sampling: Integral pump; sample path is protected by a hydrophobic filter
Battery: 4 ‘D’ size Alkaline Cells or Rechargeable Battery Pack
Battery Life: 18 hours Alkaline (12 hours with External Semiconductor Sensor probe connected) or 8 hours Rechargeable at 20 C (68 F)
Construction: Moulded polypropylene case
Rating: IP54 (Dust protected and splashproof)
Sensor Life: Flammable (LEL / VOL): 5 Years
CO: 2 Years
Measuring Ranges: 0 to 10,000 ppm Flammable EXT Range
(External Semiconductor Sensor)
0 to 1000 ppm Flammable
0 to 100% LEL
0 to 100% Volume Gas
0 to 1000 ppm Carbon Monoxide (CO)
Note: Hydrogen Sulphide and Oxygen are available on request

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Title Size
First Responder Datasheet 419 KB
First Responder Quick Operation Guide 565 KB
First Responder User Manual 2 MB

Additional information

Weight 0.190 kg

Ordering Information

44526G First Responder PPM, LEL, Volume, CO Alkaline
44526GR First Responder PPM, LEL, Volume, CO Rechargeable
42200 Flexiprobe (including Sensor)
42444 Semiconductor Survey Bellows Probe (including Dust Filter Assembly)
42638 Semiconductor Survey Bellows Probe – Handle Assembly Includes: Semi-conductor sensor (42191C), Sensor Centre Piece (42408), O-Ring (14048), Vyon Filter (42413) and Sensor Cap (42409).
42416 Semiconductor Survey Bellows Probe – Water Filter Includes: Water Filter Housing Male (42415) and Female (42405), Probe Washer (42235),Hydrophobic Filter (12358),Bellows (12738)
42636 Semiconductor Survey Bellow Probe Handle (without sensor assembly)
42197 Filter for Semicon Probe
13844 Standard Charger (c/w universal PSU)
Sensor Assembly Parts
42191C Semi-conductor sensor + PCB **
42408 Sensor Centre Piece **
14048 O-Ring **
42413 Vyon Filter
42409 Sensor Cap
Dust Filter
42405 Dust Filter Housing Female
42388 Dust Filter (box / 20)
42235 Probe Washer
42406 Dust Filter Housing Male
12738 Bellows
Water Filter
12358 Hydrophobic Filter
42235 Probe Washer
42415 Water Filter Housing Male
Other Spares
42261S Combustion Chamber Assembly **
42174 Top Cover Assembly **
42082 Main PCB Asembly **
42211 First Responder User Handbook
42284 EPROM ** (Serial Number required)
42262 Case Assy Centre Section **
42255 Probe PSU Assembly **
42227 Main Cable Assembly (Main PCB to Cell Block) **
42180 Rechargeable Battery Pack
42175 Battery Cover Assembly – Dry Cell
13405 Carrying Case
42220 Dust Cap Harness Assembly
42041 Quick Op Guide

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