Continuous soil/ground gas monitoring

Using spot measurements to understand ground-gas regimes often results in high levels of uncertainty.

Uncertainty exists as concentration changes over time and spot sampling only provides a snap shot of the ground gas regime at that instant.

Considerable published material from experts who measure ground-gas and preform risk assessments question whether traditional methods of collecting data are adequate. This led Salamander to provide the definitive solution, the patented GasClam® 2

GasClam 2 collects unmanned continuous ground gas concentration data as well as parameters that are known to control it – subsurface pressure, atmospheric pressure and water level.

This information reduces uncertainty by providing the full picture of what is happening below ground. Also by observing the process controlling the ground gas regime you can predict how it will change in the future.

Using GasClam 2 therefore, provides a hierarchy of financial benefits. The first saving comes from reducing the number of site visits by a field engineer.

The second saving comes from reducing the overall length of monitoring programmes as legislative data requirements can be met quicker.

The third, and largest savings is made by designing appropriate, rather than over-engineered, solutions based on complete and robust data.

Applications include:

  • Brownfield site investigation
  • Landfill perimeter monitoring and control
  • Shale and Coal Bed Methane / Seam Gas site monitoring
  • Vapour intrusion studies
  • Waste Management
  • Refineries and petroleum storage monitoring

See our leading range of VOC detectors:

Key Features

Key Features

  • Continuous gas (methane, carbon dioxide, oxygen, hydrogen sulphide and VOC) monitoring with configurable logging intervals
  • Continuous atmospheric/borehole pressure and monitoring with configurable logging intervals
  • Battery powered deployment for over 3 months (depending on logging frequency)
  • External power option for extended deployment
  • Intrinsically safe for use in explosive atmospheres
  • Discrete installation

Key Benefits

  • Optimised site management with insights from continuous monitoring
  • Improved site characterisation and event flagging help reduce risks
  • Demonstrates regulatory compliance and due diligence
  • Supports and industry recognised best practice approach to ground-gas monitoring
  • Aids selection of cost effective solutions

Ease of Use

  • Fits in to standard 50mm/2” borehole
  • Reduces number of site visits
  • Simple PC software

Technical Specification

CO2** Infrared 0-100% 1% above 50%
0.5% below 50%
± 2% FSD
CO2** Infrared 0-5% 0.05 above 2.5%
0.025 below 2.5%
± 2% FSD
CH4** Infrared 0-100% 1% above 50%
0.5% below 50%
± 2% FSD
CH4** Infrared 0-5% 0.05 above 2.5%
0.025 below 2.5%
± 2% FSD
O2 Electrochemical 0-25% 0.1 % ± 5% of reading
± 1 digit
CO Electrochemical 0-2000 ppm 1 ppm <± 3 ppm at 0
± 5% at 250 ppm
± 10% full scale
H2S* Electrochemical 0-100ppm 1 ppm ± 1 ppm at 0
± 2.5% at 50ppm
VOC* PID 0-4000 ppm 1 ppm ± 5% of reading
± 1 digit
CO Electrochemical 0-500ppm 1ppm <± 3ppm at 0
± 3% at 250ppm
H2S Electrochemical 0-200ppm 1ppm <± 1 ppm at 0
± 2% at 100ppm


Barometric Pressure Piezoelectric 800 to 1250 mBar 1 mBar
Borehole Pressure Piezoelectric 800 to 1250 mBar 1 mBar
Temperature Internal Chip -5°C to +50°C or
22°F to 122°F
0.1°C or 1°F
Water Depth* Piezoelectric 0 — 25m
(various available)
0.01 m


Power Options Internal: Option of Lithium primary cells or Duracell Alkaline D-Cells or
Rechargeable battery pack
External: Accepts intrinsically safe external power supply for extended
and/or rapid monitoring
Typical Battery
Life (hourly
Lithium primary cells – 3 Months
Alkaline cells – 1 Month
Rechargeable battery pack – 3 Weeks
Case High quality stainless steel
Dimensions Overall length: 90cm (35.4 in)
Borehole tube length: 83cm (32.6 in)
Head diameter: 11cm (4.3 in)
Borehole tube diameter: 4.7cm (1.85 in)
7.5kg (16.8 lbs)
Protection IP68 rated (continuous submersion)
-20oC to 50oC (-4oF to 122oF)
Approvals EMC, ATEX 0105 X
Ex II 2G Ex d ib [ib] IIB T4 Gb
IECEx d ib [ib] IIB T4 Gb
CSA C (US & Canadian Approvals)
Class 1, Zone 1 (A) Ex d id IIB T4
Patents European and World-wide Patented

* Optional

** Choice of 2 IR sensors, specify on order.

What’s included

The GasClam 2 includes the following items:

For full details please contact Ion Science or an Ion Science Distributor for an up to date price list.

GasClam 2 detector Kit:

  • GasClam 2 continuous gas monitor
  • Rechargeable NiMh battery pack and charger
  • PC link cable

Product downloads – Ion Science

Product downloads - Ion ScienceFor all downloadable resources please click here

Brochures, Manual, Quick Start Guides, Software etc.

*Please note, the downloadable Instrument Software version 6.1.11, is suitable for GasClam 2 instruments only using firmware 8.03 (onwards). We do continue to support the previous version of the GasClam Instrument, therefore, please contact us directly for further assistance regarding the previous

Video Support

Video Support – Coming soon

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