Understanding protection and explosion-proof markings is essential when selecting instruments for hazardous or harsh environments. This guide explains IP (Ingress Protection) codes, ATEX/IECEx explosion-proof designations, and Chinese GB standards.
IP Codes
The IP code consists of two digits: the first indicates solid particle protection (0-6), the second indicates liquid ingress protection (0-9). For example, IP67 means dust-tight and protected against temporary immersion.
Explosion-Proof Markings
Ex markings indicate the type of protection (e.g., Ex d = flameproof, Ex ia = intrinsic safety), gas group (IIC is the most stringent), and temperature class (T1-T6). Understanding these codes ensures proper instrument selection for hazardous area applications.