Low flow gas meters

  • Proven ‘tipping bucket’ design. 
  • Two sizes available to meet a range of flow rates.
  • Gas tight lid allows off gases to be collected for analysis.
  • Modular design allows use as a single unit or, by clipping together, as a bank of meters.
  • High accuracy and reproducibility.
  • Can be used with a DAS unit, a PICO logger, or your own interface.
How it Works

The tipping bucket principle was first described for low-flow gas measurement by the Water Research Centre, UK (WRC) in 1976 and workshop-built versions used successfully in many laboratories. We have redesigned the original concept and now use injection moulded components to give an easily serviceable and reliable modular design flow meter.

Up to 8 single gas meters can be linked directly, using a 3.5 mm jack plug lead to a Pico Logger.  Up to 4 banks of 4 gas flow meters (16 total) can be linked to a DAS unit via a 6-pin mini DIN plug.

The small low-flow gas meter has a bucket volume of 6 mL making it suitable for flows from 6 to 10,000 mL day-1 . The larger meter has a bucket volume of 25 mL making it suitable for flows up to 100 L day-1.

The tipping bucket of the flow meter is mounted inside the vessel on a stainless steel saddle with stainless steel pivot pins. Gas enters through a PTFE tube giving a small bubble size and even flow due to reduced surface tension. Each tip of a bucket is picked up by an externally mounted Reed switch which is triggered by a magnet sealed into the bucket.