The pocket-sized sampling pump for thermal desorption


ACTI-VOC is a robust low-flow pump for sampling vapour-phase organic compounds (VOCs) onto sorbent tubes for subsequent analysis by thermal desorption (TD).


Being lightweight, easy-to-use and intrinsically safe, ACTI-VOC is ideal for personal monitoring and a wide range of other air and gas sampling applications.


Unlike other personal monitoring pumps on the market, ACTI-VOC is optimised for sampling onto TD tubes, and automatically compensates for different impedances, ensuring constant flow rates whatever the sorbent packing.

Product Highlights

  • Optimised for sampling onto TD tubes.
  • Constant-flow sampling from 20–200 mL/min.
  • Constant-pressure sampling from 1–350 mL/min.
  • Simple screw-operated flow adjustment makes ACTI-VOC easy to calibrate.
  • Intrinsically safe (ATEX-approved).
  • Long battery life ensures stable performance for over 8 hours.
  • Pocket-sized, lightweight and easy to use.

The power of pumped sampling

Pumping of air onto sorbent tubes is one of the most versatile methods for sampling VOCs. Precise volumes of air from 20 mL to several hundred litres can be drawn through the tubes, allowing analytes over a wide concentration range to be sampled and analysed – reliably and quantitatively.


Using ACTI-VOC in combination with multisorbent tubes also allows the full power and versatility of TD to be realised. The vapour fraction of analytes ranging in volatility from C3 to n-C40 can all be sampled and then analysed simultaneously.

No need to calibrate every tube

ACTI-VOC shows exceptional repeatability, meaning that you don’t have to calibrate the pump for every tube. As well as saving time and effort, this makes it ideal for use in Markes’ MTS-32™ multiple tube sampler.

Tubes, bags and more...

ACTI-VOC is compatible with sampling into any thermal desorption tube, up to a maximum flow of 350 mL/min.


ACTI-VOC can also be used to sample airor gas into Tedlar® bags, and works perfectly with Markes’ SafeLok™ tubes. These tubes harness Markes’ patented diffusion-locking technology to prevent diffusive ingress, both when sampling at low flow rates, and during tube storage or transport. SafeLok tubes improve both

routine and trace-level air monitoring applications.

Each ACTI-VOC kit contains:

  • Tubing and adaptors providing push-fit connections to TD tubes, guaranteeing constant-flow operation
  • CapLok™ tool to simplify tube capping
  • Tool for flow adjustment
  • Mains charger
  • Adaptor for bag sampling
  • Convenient carry-case.

Markes supplies a wide range of stainless steel and glass tubes for pumped sampling, with innovations such as SafeLok technology, and barcoding and RFID tagging for easy tube tracking. Our TD experts are also happy to advise on all your VOC sampling and analytical queries.

Technical specification

Flow range

  • Constant-flow mode: 20–200 mL/min
  • Constant-pressure mode: 1–350 mL/min

Note: External pump flow calibration requires a digital flowmeter or primary standard low-flow calibrator.


Flow control

  • ±5% of set point or ±3 mL/min, whichever is greater

Operating conditions

  • Temperature: –20°C to 45°C
  • Relative humidity: 0–85%

Electrical rating

  • Battery: Rechargeable NiMH
  • Run time: 8 hour minimum
  • Charging time: 14–18 h
  • Output: 4.8 V, 720 mA h

Sorbent tube compatibility

  • Industry-standard tubes (3½″ × ¼″ o.d.)
  • Any 6 mm o.d. tube (including standard DAAMS tubes)


  • Width: 6.4 cm (2.50″)
  • Height: 3.5 cm (1.38″)
  • Length: 11.8 cm (4.63″)


  • 340 g (12 oz)

Additional features

  • Digital clock indicating elapsed sampling time
  • Flow fault indication
  • LED battery check
  • Belt clip
  • Dual filtration system
  • External flow adjust
  • Automatic instant-fault shutdown

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