SURGE Series Lightning and Transient Protector Installation Manual
The SURGE Series of transient protectors consist of multi-stage devices which include three terminal gas discharge tubes, thyristor crowbar devices, and coordinating resistors.
Wiring, particularly long horizontal wiring, can convert transient electrical fields to destructive voltages at sensors and data logger terminals. Transient protection equipment can be used to divert these transients to ground, increasing installed system reliability.
The SURGE Series of transient protectors consist of multi-stage devices which includes three terminal gas discharge tubes, thyristor crowbar devices, and coordinating resistors. They are capable of protecting against high-speed (100 volts per microsecond) transients of up to 20,000 amps, letting only 77 volts through before clamping to 4 volts. The protector is housed in a NEMA-4X enclosure or in a compact T35 DIN-rail housing with screw-terminal input/output and ground connection through the DIN rail, simplifying connections, and facilitating good signal practices: i.e. labeling, shielding, and routing outside cables away from protected lines.
In normal operation, the protector appears as a low resistor in series with each wire, typically having no effect on operation. During a transient, the 4 signal lines and up to 2 shield lines are clamped to ground. Once the transient is over, the device self-resets, allowing normal operation to resume. The protector is suitable for use with most devices, including vibrating wire sensors, data loggers, 4-20 mA transmitters, and other DC-powered sensors.
|Conductors Protected||SURGE 4D: 4+2 shields
SURGE 4N: 4+1 shield
SURGE 16N: 16+4 shield
|Maximum transient current per line (1 event, 8/20 µs)||20,000 Amps|
|Minimum conduction threshold voltage||58 Volts|
|Peak pass-through voltage (common or normal mode)||77 Volts|
|Output clamp voltage||4 Volts|
|Series resistance per line||1.6 Ohms|
|Maximum leakage current||5 Microamps|
|Hold current||150 Milliamps|
|Maximum AC current (1 line cycle)||30 Amps RMS|
|Maximum continuous current||2 Amps|
Lightning and Transient Protectors are commonly used to divert transient electrical fields in wiring to the ground; increasing installed system reliability.
|SURGE 4D: 4-Wire and Shield Transient Protector for DIN rail mounting||ELLP4501|
|SURGE 4N: 4-Wire and Shield Transient Protector in NEMA-4X enclosure||ELLP4500|
|SURGE 16N: 16-Wire and Shield Transient Protector in NEMA-4X enclosure||ELLP4504|
|5/8” Copper Ground Rod – 1.5 m length||ELGK4600|
|5/8” Copper Ground Rod – 3 m length||ELGK4601|
I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd