NRG Product Manual
LOGR-S Data Logger
NRG_LOGR-S_Manual
Rev. 1.0
[email protected] | Page 39
5 November 2021
SECTION 4 | FIELD INSTALLATION
Grounding & Lightning Considerations
Properly grounding your system helps protect your logger, sensors,
and data.
It is your responsibility to provide proper earth grounding for the tower,
logger, and sensors. All warranties on NRG instruments and sensors are
voided if your system is not properly grounded.
Meteorological sensors, loggers, and towers accumulate static electrical charge unless they are
properly grounded.
High winds, low humidity, and the height of the tower above ground increase the
rate of charge accumulation. Charge continues to accumulate until the developed voltage difference,
sometimes thousands of volts relative to ground, causes dielectric breakdown and an electrostatic
discharge (ESD). ESD can damage any scientific instrument or sensor, including NRG loggers,
pyranometers, and other sensors.
Any structure that the logger is mounted to must be carefully
grounded and protected against lightning.
The same careful grounding of the logger and sensors
provides the best protection against lightning damage as well.
The LOGR grounding terminal, labelled with chassis ground symbol to
the left must be connected to a suitable earth ground.
The LOGR internal over-voltage and noise suppression systems use this
chassis ground as the path to return ESD, overvoltage, or noise currents
to ground.
The ground terminal should be properly connected before
any other wiring is connected to the logger
.
Suitable grounding can include a local earth terminal (such as a driven ground rod) and its connected
grounding conductor. In grid-connected applications, the electrical safety ground may be suitable. The
NRG shelter box kit which includes the AC grid power supply provides a grounding connection to the
electrical grid safety ground.
The logger provides internal connections at th
e “SHLD” terminal of each sensor terminal block to the
LOGR chassis ground. These terminals make it easy to connect the cable shields for each sensor cable to
ground.
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