---
title: On Impulse, why is there a delay between starting the test and the air flow starting?
description: Impulse is designed so that the impeller begins to turn and the specimens begin to tumble just before the air flow comes on. There is an interval of approx. 2 seconds.
---

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# On Impulse, why is there a delay between starting the test and the air flow starting?

## Impulse is designed so that the impeller begins to turn and the specimens begin to tumble just before the air flow comes on. There is an interval of approx. 2 seconds.

Extensive laboratory testing has proved that having a delay on the air flow means that:

- Specimens are much less likely to become stuck to the impeller or the chamber walls
- The cotton sliver - added to aid and enhance the appearance of pills therefore making assessment easier - is much less likely to become trapped in the filter at the back of the chamber.

![Impulse Air Flow](https://customercare.pptgroup.com/hs-fs/hubfs/Knowledge%20Base%20Import/Impulse%20Air%20Flow-1.jpg?width=688&name=Impulse%20Air%20Flow-1.jpg)

To turn the air on, toggle the Auto Air switch to the right.  
It will display blue to show that the **air on** option has been selected.  
The air flow display window will still display OFF.  
Once the air flow activates the window will change to ON.

![](https://customercare.pptgroup.com/hubfs/Knowledge%20Base%20Import/appsupport_james-heal_co_uksupportsolutionsarticles5000746488-on-impulse-why-is-there-a-delay-between-starting-the-test-and-the-air-flow-starting.gif)

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