DOSIMETER PLAQUETTE FOR REACTIVE GASES FOR USE IN THE MONITORING OF INDUSTRIAL SAFETY IN A HAZARDOUS ENVIRONMENT

摘要

1. Badge for rapid detection of a dose of a reactive gas or vapour, in particular of a noxious gas with delayed onset of action, based on an indicator surface (6) which undergoes a colour change under the influence of the gas or vapour and is sub-divised into measurement areas of differing sensitivity by being differently covered with covering layers (7),characterised in that the covering layers (7) are impregnated with the same indicator as the indicator surface (6) itself and do not become permeable to his gas until saturation absorption has been reached, and that the indicator surfaces (6) is separated from the convering layers (7) by an air gap (9).