... 0 - 100% Relative Humidity, non condensatingFactory Sealed YesIngress Protection Type 4X, IP66, IP67EU Directive compliance CE mark, ... andA2:2001. NAMUR recommendations NE21.Transient / Built-in Lightning Protection(9) EN61326, IEC 801-5, level 1 kV.T1 ... 587 Category B transientprotection and IEEE 472 surge protection. The protection includes gas-filled discharge tubesand semiconductor components. ...