Energy-coordinated two-stage arrester, no leakage currents to earth, for 4-20 mA interfaces with M20 x 1.5 thread (female/male). Direct, indirect or no shield earthing. Cable gland available as an accessory.
Energy-coordinated two-stage arrester with gas discharge tube and diodes to earth. For unbalanced interfaces with 1/2-14 NPT thread (male/male). The earthing conductor is led through the surge arrester.
929961 and 929963 are surge arresters with a low-capacitance protective circuit for protecting intrinsically safe measuring circuits and bus systems, meets FISCO requirements. Insulation strength > 500 V to earth.
929965 and 929960 are energy-coordinated two-stage surge arresters with low-capacitance protective circuit for protecting intrinsically safe measuring circuits and bus systems, meets FISCO requirements. Insulation strength > 500 V to earth. Features a two-part design for easy installation. Cable glands must be ordered separately.
Instead of using a conventional cable gland, DEHNpipe surge arresters are screwed directly onto the field device, then the permanently connected lines are connected to the terminals of the field device. Once installed, the DEHNpipe surge arrester will discharge interfering impulses through the metal enclosure only, and not through the inside of the field device, to provide energy-coordinated surge protection.
Depending on the cable gland used, the cable shield is either earthed directly or indirectly or is not earthed at all. Indirect earthing integrates the shield into the protection concept – without leakage pickups. Earthing accessories are also available for plastic field enclosures.
A DEHNpipe surge arrester will protect the inside of field devices against dangerous over-voltage in intrinsically safe measuring circuits and bus systems. These corrosion resistant, stainless steel Surge Protection Devices (SPDs) provide surge protection for field devices in outdoor areas, while minimizing space requirements, and reducing installation work.
DEHNpipe is designed for use in two-wire measuring sensors with 4-20 mA interfaces, but they can also be used for applications allowing only single assignment of the field device terminals or providing space for only one cable gland.
The devices of the DEHNpipe family are made of corrosion-resistant stainless steel and can be directly screwed onto a field device in a potentially explosive atmosphere. Like a field cable, the permanently connected lines are connected to the terminals of the field device. The surge arresters can be used for a wide range of applications. A single arrester is capable of protecting two unearthed signal circuits or the supply circuit of the field device and one signal circuit. When installed in a fieldbus distributor, two field devices can be protected by a single arrester. The surge arresters are designed in such a way that the protection components are arranged in parallel to the cable run.