Suitable for Explosion hazardous areas? Temperature Class: to T6 (depending on power rating) Ambient temperature: up to 60?C II C (all explosion classes) Suits circular sightglass fittings to DIN 28120/28121 or similar from size DN 40 and screwed sightglass fittings DIN 11851 from DN 65 Operating Voltage 12V, 24V, 120V, 230V Power, depending on voltage: up to 20W Secured by hinged bracket or adapter flange