DEHNpipe
Surge Arrester

Protect your intrinsically safe measuring circuits and bus systems with a DEHNpipe surge protection device. With over a dozen style to choose from including flame and explosion proof configurations, the DEHNpipe surge arrester is sure to fit your process needs.

Robust Stainless Steel Design

Lines are permanently connected to field device terminals
Conforms with lightning protection zones from 0_B-2 and higher
ATEX and IECEx approval

Easy to Install or Retrofit

DEHNpipe screws directly onto field device
Suitable for almost all types of two-wire field devices with cable gland
Can be earthed directly, indirectly, or not at all

Designs for any Process

DEHNpipe Surge Arrester

Energy coordinated two-stage arresters

929941

DPI MD 24 M 2S

For Mounting On: M20 x 1.5 female thread / M20 x 1.5 male thread

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.

Easy to mount due to two-part design
Suitable for three shielding concepts

929921

DPI ME 24 N A2G

For Mounting On: 1/2-14 NPT male thread / 1/2-14 NPT male thread

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.

Robust design
Encapsulated protective circuit
Single-ended cable connection available on request

For intrinsically safe systems

929961

DPI CD EXI 24 M

For Mounting On: M20 x 1.5 male thread

Surge arrester with a low-capacitance protective circuit for protecting intrinsically safe measuring circuits and bus systems, meets FISCO requirements. Insulation strength > 500 V to earth.

• Easy to mount on field devices with spare cable gland
• Self-capacitance and self-inductance negligibly small

929963

DPI CD EXI 24 N

For Mounting On: 1/2-14 NPT male thread

Surge arrester with a low-capacitance protective circuit for protecting intrinsically safe measuring circuits and bus systems, meets FISCO requirements. Insulation strength > 500 V to earth.

• Easy to mount on field devices with spare cable gland
• Self-capacitance and self-inductance negligibly small

929965

DPI MD EX 24 N 2

For Mounting On: 1/2-14 NPT female thread / 1/2-14 NPT male thread

Energy-coordinated two-stage surge arrester 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.

• Maximum degree of protection by installation in the cable run

929960

DPI MD EX 24 M 2

For Mounting On: M20 x 1.5 female thread / M20 x 1.5 male thread

• Two part design for easy installation
• Self-capacitance and self-inductance negligibly small

Easy to mount on field devices with spare cable gland
Self-capacitance and self-inductance negligibly small

Maximum degree of protection by installation in the cable run

Self-capacitance and self-inductance negligibly small

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.

For potentially explosive atmospheres

929962

DPI CD EXD 24 M

For Mounting On: M20 x 1.5 male thread

Flameproof surge arrester with a low-capacitance protective circuit for protecting measuring circuits and bus systems in potentially explosive atmospheres. Insulation strength > 500 V to earth. Certified to CSA and USA Hazloc standards.

• Easy to mount on the spare cable gland of field devices

929964

DPI MD EX 24 M 2

For Mounting On: 1/2-14 NPT male thread

• Two-part design for easy installation
• Self-capacitance and self-inductance negligibly small

929971

DPI CD HF EXD 5 M

For Mounting On: M20 x 1.5 male thread

Flameproof surge arrester with an energy-coordinated low-capacitance protective circuit for protecting measuring circuits and bus systems in potentially explosive atmospheres.

• Easy to mount on the spare cable gland of field devices

929962 and 929964 are flameproof surge arresters with a low-capacitance protective circuit for protecting measuring circuits and bus systems in potentially explosive atmospheres. Insulation strength > 500 V to earth. Certified to CSA and USA Hazloc standards.

Flameproof surge arrester with an energy-coordinated low-capacitance protective circuit for protecting measuring circuits and bus systems in potentially explosive atmospheres.

929969

DPI CD EXD 230 24 M

For Mounting On: M20 x 1.5 male thread

Flameproof surge arrester for the data and power side for protecting one 120 / 230 V power supply system and one 24 V data interface of field devices in potentially explosive areas (zones 1 and 2). Additional safety due to fault-proof Y circuit for 120 / 230 V power supply systems.

• Dual surge protection for 120/230 V power supply systems and data interfaces
• Easy to mount on field devices with a spare cable gland

929970

DPI CD EXD 230 24 N

For Mounting On: 1/2-14 npt male thread

• Dual surge protection for 120/230 V power supply systems and data interfaces
• Easy to mount on field devices with a spare cable gland

929951

DPI CD EXI+D 2X24 N

For Mounting On: 1/2-14 NPT male thread

Flameproof surge arrester for protecting two 24 V interfaces in potentially explosive atmospheres.

• Easy installation on field devices with a spare cable gland
• Flexible use in Ex(i) and Ex(d) circuits

929950

DPI CD EXI+D 2X24 M

For Mounting On: M20 x 1.5 male thread

Flameproof surge arrester for protecting two 24 V interfaces in potentially explosive atmospheres.

• Easy installation on field devices with a spare cable gland
• Flexible use in Ex(i) and Ex(d) circuits

929969 and 929970 are flameproof surge arresters for the data and power side for protecting one 120 / 230 V power supply system and one 24 V data interface of field devices in potentially explosive areas (zones 1 and 2). Additional safety due to fault-proof Y circuit for 120 / 230 V power supply systems.

• Dual surge protection for 120/230 V power supply systems and data interfaces
• Easy to mount on field devices with a spare cable gland

929950 and 929951 are flameproof surge arresters for protecting two 24 V interfaces in potentially explosive atmospheres.

• Easy installation on field devices with a spare cable gland
• Flexible use in Ex(i) and Ex(d) circuits

How the DEHNpipe Surge Arrester Works

Installing a DEHNpipe Surge Arrester

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.

Earthing Made Easy

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.

Reliable Surge Protection

Surge Protection Devices

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.

Configurations for Any Process

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.

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(Video) DEHNpipe Surge Arrester for Outdoor Use

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.