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27/04/2026

How to bump test the Honeywell BW Flex 4?

Posted by Rhys Redrup
how to bump test the honeywell bw flex 4

Introduction to the Honeywell BW Flex 4

With a choice of 12 different sensor types, the Honeywell BW™ Flex protects you from multiple gas hazards, in a small, rugged, and easy to use device. BW™ Flex keeps specialists operating in confined spaces, or general workers on a plant, safe from gas hazards while making safety compliance for the business easy.

The BW Flex 4 by Honeywell is a compact, high-performance multi-gas detector designed for maximum safety and versatility in hazardous environments. It supports up to four gas sensors simultaneously and can be configured with a selection of 12 sensor types, including both standard and exotic gas options. Standard sensors include Hydrocarbon NDIR, Flammable Catalytic Bead (filtered and unfiltered), Oxygen (electrochemical and lead-free), Hydrogen SulphideCarbon Monoxide, and Sulfur Dioxide. For more specialised applications, exotic gas sensors are available for Carbon Dioxide (NDIR), Nitrogen Monoxide, Nitrogen Dioxide, Carbon Monoxide (low hydrogen response), Chlorine, and Hydrogen Cyanide.

How to bump test the Honeywell BW Flex 4?

  • Screw the regulator onto the gas bottle until tight
  • Push the tubing onto the regulator spout
  • Connect the other end of the tubing to the calibration adaptor
  • Press and hold the button to power on the detector
  • Allow the device to complete its start-up checks
  • Ensure sensors are zeroed in fresh air
  • Double press the button to enter the menu
  • Single press to scroll to the “Bump” option
  • Press and hold to select
  • When “Apply gas” appears:
    • Fit the calibration adaptor
    • Turn on the gas regulator
  • Wait for the sensors to respond
  • Confirm all indicators turn green once the bump threshold is reached
  • When “Turn gas off” appears:
    • Turn off the regulator
    • Remove the calibration adaptor
  • Allow time for the sensors to purge
  • Once readings return to ambient levels, the detector is ready for use

Honeywell BW Flex 4 bump test video

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