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Sub-Slab & Vapor Intrusion Sampling

Monitor gases directly under the slab of buildings to determine the potential for intrusion into the indoor environment. A vacuum tight seal is made through the building’s foundation, with a unique “triple seal” using two O-rings and a water dam that ensures that only gases from beneath the slab will be drawn into the sample train and canister. After sampling, the slab face sealing fitting is removed allowing a temporary plug to be installed.


Most reliable, non-contaminating slab vapor seal on the market.

Shortest and most inert flow path ensures complete recovery and no sample carryover.

Chameleon controls the flow rate to avoid disturbing the equilibrium of Volatile Organic Compounds between gas, adsorbed soil and dissolved water phases.

Avoids contaminating the sample by replacing the traditional plastic tubing. All surfaces are Silonite™ ceramic lined stainless steel to prevent outgassing of contamination while ensuring maximum compound recovery.

Compatible with Entech helium shroud for “complete flow path” leak testing right up to the canister.

Chameleon Soil Gas Sampler shown with Entech Slab-Tight™ Sampler.

Entech Slab-Tight™ Sub-Slab Sampler

Entech’s unique Slab-Tight™ sub-slab sampler eliminates interferences created by grout and other slab sealing materials.

Grout may contain contaminants that can positively bias the results.

Added Down-hole moisture from the grout may affect the solid/liquid/gas phase equilibrium.

The Entech Slab-Tight sub-slab sampler makes a mechanical connection and seals with no chance of contaminating the collected soil gas.

Tracer Gas Shroud for butane or helium leak checking is available.

Helium Tracer Gas Shroud Solution

The Entech helium shroud solution was designed to be easy to use, easy to clean, and affordable. It delivers on all points by allowing for the entire soil gas train to be connected and disconnected from the shroud in just seconds through the utilization of a magnetic latching system. Read More

The inexpensive shroud can be reused over and over with clean evacuated sampling trains that are shipped directly from the lab and snap right in! The sample trains are sent under vacuum, therefore just a quick glance at the gauge is all it takes to satisfy the field shut-in test.

Helium Tank & Regulator

Entech provides 1800 psig He cylinders with a regulator, operated at 2-200 psi, to complete the all-in-one sampling solution.

Helium Detector

The Entech He / O2 analyzer is a precision instrument for measuring the concentration of oxygen and helium in the tracer gas shroud. The analyzer is characterized by high accuracy and reliability thanks to innovative measurement techniques. The technology works by measuring the speed of sound, thus there is never a need to change the helium sensor.

Chameleon Soil Gas Sampler
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Surface Soil Gas Monitoring
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Shallow Probe Monitoring
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Permanent Well Monitoring
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Chameleon Brochure

Sampling soil gas into canisters provides significant advantages over the use of passive adsorbent samplers with regard to both maintaining the integrity of the sample in the eld and ensuring that the best analytical technique is used in the laboratory.