What is the difference between diffusion and pumped models?
Diffusion models do not have a pump and detect gas that is in the atmosphere within the room they are in. Pumped models have a pump built in or added as an addition that draws gas into the device. Pumped models can be used in the same areas as diffusion models but are also useful in difficult to reach areas such as tanks, vessels, pits, or confined spaces where gas needs to be drawn into the gas detector.
Where should you use a diffusion model?
Diffusion gas detectors should be used for personal gas monitoring in open or well ventilated areas. They monitor the air around the worker in real time. They are commonly used in:
- Manufacturing facilities
- Utilities and water treatment sites
- Plant rooms
- Warehouses
- Routine maintenance work
- General industrial environments
Diffusion detectors are not designed for remote sampling or confined space pre-entry testing. Pumped gas detectors should be used for these applications.
Where should you use a pumped model?
Pumped gas detectors should be used for remote sampling and confined space entry. They actively draw air into the detector using a pump and sampling hose. They are commonly used in:
- Confined spaces
- Storage tanks
- Underground chambers
- Silos and vessels
- Sewers and manholes
- Pre-entry atmospheric testing
Pumped detectors are designed for environments where the atmosphere must be checked before workers enter the area.
Introducing the Honeywell BW Flex 5
The Honeywell BWâ„¢ Flex 5 is available in both diffusion and pumped models, giving users greater flexibility across different gas detection applications. In diffusion mode, the detector monitors the air naturally surrounding the user, making it ideal for personal gas monitoring. In pumped mode, the Flex 5 actively draws air into the detector using a sampling pump, allowing users to test atmospheres remotely before entering hazardous areas eg confined spaces.
Unlike traditional gas detectors that require separate devices for each application, the BWâ„¢ Flex 5 combines both capabilities within one modular platform. This allows teams to switch between everyday personal monitoring and confined space sampling using the same detector. For example, workers can use diffusion mode during routine operations and then configure the device for pumped sampling when carrying out confined space entry checks.
