The S4PE is used to detect very persistent agents in a liquid form.
For example, Vx does not give any vapour at ambient temperatures. It is therefore impossible to detect Vx with a standard gas detector.
Thanks to the scraper, a sample is collected from the surfaces to be checked. The sampled liquids are converted into vapor or aerosols by the heating system of the S4PE, so that they can be analyzed by the AP2C.
1 – Put the scraper on the S4PE
2 – Rub the contaminated surface with the scraper
3 – Test it with the AP2C or the AP4C