Presostat ciśnienia do pary wodnej, gorącej wody, gazu i paliwa DWR-577 HONEYWELL

In many aspects, safety engineered pressure limiters offer a higher degree of safety compared with normal pressure switches and are therefore especially suitable for chemical process engineering and thermal installations in which safety is an especially critical factor in pressure monitoring. Pressure switches can also be used in Ex- zones (zone 0, 1, 2 and 20, 21, 22) and, in all cases, require an isolating amplifier. The isolating amplifier is also responsible for monitoring lines for short circuit and line break and therefore offers an additional safety advantage even in non Ex-zones. For Ex-applications, the isolating amplifier must be installed outside the Ex-zone. The lines between the isolating amplifier and the pressure switch are monitored for short circuit and line break. Explosion protection code: Ex II 1/2G Ex ia IIC T6 Ga/Gb, Ex II 1/2D Ex ia IIIC T80^oC
Intrinsically Safety: The equipment employed in explosion relevant areas are components of inherently safe electrical circuits. An electrical circuit is inherently safe if the amount of energy it contains is so small that no spark or other thermal effect can arise. This reliably prevents the ignition of explosive gas mixtures in the proximity of this equipment. In the context of this directive, pressure switches and thermostats containing no switching components with energy storage effects are referred to as „simple electrical equipment.”