Detection, Protection, Innovation

Gasurveyor 11-500

Package includes:

  • Gasurveyor 11-500 Instrument (42501 or 42501R)
  • G500 Carry Case (13405)
  • 4mm Hex Driver (12451)
  • User Handbook (42279)
  • 1.5M Tygon Tubing (12712)
  • 35cm Solid End Probe (12480)
  • Probe Handle Assembly c/w Filters (12481)
  • Cotton Filters – 2 Boxes of 10 (10077)
  • Sample Line Adaptor (12688)
  • Shipping List (42639)
  • LR20 Alkaline Battery x 4 (10278) *Dry Cell Instruments Only*
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The Gasurveyor 11-500 compliments both the Gascoseeker, Gasurveyor 3-500 and the Oxygas instruments with a similar performance, measuring % LEL and % volume flammable hydrocarbons, but with the addition of oxygen.

The Gasurveyor 11-500 is designed for either gas/air or gas/nitrogen/air purging, with the ability of the Gascoseeker and the addition to measure oxygen during a nitrogen purge.

In accordance with the Gasurveyor 3-500, the 11-500 also has the following features:

  • Automated zero during start-up
  • Manually selectable purge mode
  • Optional rechargeable batteries
  • Optional gas alarms (not recommended if using as a purge instrument)

The two-button operation means the Gasurveyor 11-500 is easy to use and operator training can be conducted quickly. The rugged design allows the Gasurveyor 6-500 to be used in harsh environments.  The Gasurveyor 6-500 is also fully compatible with our range of calibration software and equipment.

For more info, call our sales team on +44 (0)141 302 8302.

Key Features

  • Automatic hydrocarbon range selection
  • Manual selection of purge mode
  • Simple 2-button operation, allowing user access to all features
  • Automatic zero
  • Gas/air and gas/nitrogen/air purge mode
  • Hydrocarbon resolution to equivalent of 50 ppm methane
  • Accurate, robust and extremely reliable instrument
  • Integral pump with flow-path protected by water filter
  • Rugged carbon loaded polypropylene case, sealed to IP54 rating and suitable for outdoor use


  • Leak detection
  • Bar hole survey
  • Gas/air or gas nitrogen air purging
  • Gas escape detection
  • Petroleum installations
  • Hot work permitting
  • Confined space (only hydrocarbon and oxygen gases)

Technical Specification

Measuring Ranges

O2 0 – 25%
LEL 0 – 10%
LEL 10 – 100%
VOL 0 – 100%


Ex CertifiedUL_Logo_50x50 CSA (US and Canada) Certified CE Certified

IEC Ex ia d IIC T4 Gb
ATEX Ex II 2G Eex ia d IIC T4
UL913 Class 1 Div 1 Groups ABCD
CSA Class 1 Groups ABCD T4

Physical Properties

180 (H) x 95 (W) x 105 (D) mm
7.1 (H) x3.7 (W) x 4.1 (D) in

1.2 kg (2.5 lbs) with alkaline batteries


0 – 95% RH non-condensing

-20oC to +50oC (-4oF to +122oF)

Sampling System

Integral pump with flow fail sensor
Sample path protected by hydrophobic filter and auto pump switch off

Power Supply

Approx. 15 hours’ run-time
Rechargeable (NiCd):
Approx. 9 hours’ run-time


Moulded polypropylene case

IP Rating

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