Valves and Fittings | Trap and Release Valve


μInProve Trap and Release Valve

T&R valve large

The uInProve T&R valve has been designed to improve performance and reduce size of trap and release systems (T&R). Based on our PLSV technology, it offers an outstanding leak integrity and life time improving signal to noise and chromatography stability.

The bespoke T&R insert design has allowed us to embed a unique 4 steps process. The result is simpler and improved chromatography. All of this is controlled with our state of the art multi-positions electrical actuator.


  • Unique trap isolation step to improve chromatography and peak sharpness
  • Unique sample matrix vent step to simplify and improve chromatography
  • No detector baseline shift during release stage due to PLSV technology leak integrity.
  • Compatible with sensitive detectors such as Mass-Spectrometer, DID, PDHID, PED and Epd type detector due to unique leak integrity.
  • Extended life time due to PLSV design
  • Compact design
  • Compatible with vacuum
  • User configurable sequence and duration
  • Medical version available for Exhaled breath sampling 

*only available with ASDevices T&R sub-module


A unique 4 steps process




In this position, the sample gas is flowing into the trap while the carrier gas is flowing into the chromatographic system.


In this position, the carrier gas is still flowing into the chromatographic system. However, a unique venting ports is connected to the trap to vent away sample matrix without venting away the trapped molecules.




In this position, the carrier gas is still flowing into the chromatographic system. However, the trap is completely isolated. This allows the trap to be heated and stabilised before being released into the chromatographic system.



In this position, the trap content is released into the chromatographic system.



Our valve technology includes a port to which a gas, very often the carrier gas, is connected. There is consequently no need to use multiple valves to achieve this functionality. All of this is done with one valve.

In this position, this gas is used to vent away from the trap a large proportion of the sample matrix. Consequently, only a small residual proportion of the sample matrix is injected into the chromatographic column.

This embedded step provides many advantages. It allows to simplify chromatography by reducing the sample matrix loading on the chromatographic column. It also reduces the number of valves. This simplifies the chromatographic separation with impurities which have an elution time close to the sample matrix. Also, some sample matrix can pollute the column which impacts chromatography over time and causes noise. Such an example is ambient air which contains high levels of moisture.

In other cases, such as VOC or hydrocarbon analysis in air or oxygen, it allows to vent away the oxygen from the trap before heating. At high temperature, the oxygen can react with some molecules and impact the measurement.


Helium is the carrier has of choice for most chromatographic systems that need to measure permanent gases to below 1 ppb limit of detection. Unfortunately, helium is expensive.

With ASDevices innovative uInProve T&R technology in combination with a proprietary trapping material that can concentrate permanent gases and Epd sensing technology, it is now possible to achieve ultra-low limit of detections in chromatographic systems that are simpler and more economical to operate.

Below is an example where N2, CH4 and CO are measured using our technologies. The unique sample matrix purge feature of the uInProve T&R allows the hydrogen matrix to be vented while our unique trapping material allows permanent gas concentration and hence < 1 ppb limit of detection.

No other technologies can do it. Thanks to the combination of all our innovative technologies.