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Technical Note
Improving Weather Station Grounding
You can improve the grounding of Vaisala weather stations to make the weather station less
susceptible to damages caused by lightning.
While visiting the site, check also that the enclosure and sensor cables have been grounded according
to the instructions.
For more detailed information on grounding, see Grounding and Lightning Protection in Vaisala
Outdoor Installations Technical Reference.
More Information
‣ Improving Grounding of Stainless Steel Flanges (page 2)
‣ Improving Grounding of Rubber Flanges (page 5)
‣ Checking Weather Station Grounding (page 6)
Improving Weather Station Grounding
AWS310, AWS310‑SITE, AWS430, FOC201, RME111
PUBLISHED BY
All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners.
Vaisala Oyj
Any reproduction, transfer, distribution or storage of information contained in this document is strictly
Vanha Nurmijärventie 21
prohibited. All specifications — technical included — are subject to change without notice.
FI-01670 Vantaa, Finland
Phone:+358 9 8949 1
© Vaisala 2018
M212202EN-A
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Related Manuals for Vaisala AWS310
Summary of Contents for Vaisala AWS310
- Page 1 ‣ Checking Weather Station Grounding (page 6) PUBLISHED BY All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners. Vaisala Oyj Any reproduction, transfer, distribution or storage of information contained in this document is strictly Vanha Nurmijärventie 21...
- Page 2 Technical Note M212202EN-A Improving Grounding of Stainless Steel Flanges • Serrated lock washer A8.4 DIN6798 (8 pcs) • Torque wrench (1 … 5 Nm) Loosen the screws (4 pcs) that hold the flange at the bottom of the enclosure until you can remove the counter ribs inside the enclosure .
- Page 3 Technical Note M212202EN-A Push the screws back to place and insert the serrated lock washers on the screws. Insert the counter ribs on the screws. 3 (11)
- Page 4 Technical Note M212202EN-A Tighten all the screws lightly one by one. Tighten all the screws to 4 Nm. Repeat the procedure on the second flange of the enclosure. 4 (11)
- Page 5 Technical Note M212202EN-A Improving Grounding of Rubber Flanges Torque wrench (1 … 5 Nm) Check that the screws with which the rubber flange is attached to the bottom of the enclosure are tightened to 2.6 ...3.0 Nm. Tighten the screws if needed. 5 (11)
- Page 6 Technical Note M212202EN-A Checking Weather Station Grounding While visiting the site, check also that the enclosure and the sensor cables are properly grounded. More Information ‣ Checking Enclosure Grounding (page 6) ‣ Checking Sensor Cabling and Grounding (page 8) Checking Enclosure Grounding Check that the enclosure grounding cable is connected to the system grounding point.
- Page 7 Technical Note M212202EN-A Check that the other end of the enclosure grounding cable is connected to a grounded location such as grounding connector. System grounding point Enclosure grounding cable Grounding connector Grounding cables 7 (11)
- Page 8 Technical Note M212202EN-A Check that the grounding cables have not been pulled too tight. CAUTION! Keep the curve of the down conductor smooth with a minimum radius of the bent cable 20 cm (8 in) and never over 90° angles. Checking Sensor Cabling and Grounding If you need to shorten sensor cables, you need: •...
- Page 9 Technical Note M212202EN-A Check that the sensor cables have been cut to a suitable length. The cables must not be looped. WARNING! A long cable between units (sensors, transmitters, power supplies, and displays) can cause a lethal lightning-induced current surge. If the cables are too long: Cut the cable to proper length.
- Page 10 Technical Note M212202EN-A In weather stations with stainless steel flanges, check that the sensor cable shields have been grounded to the cable glands. • In cable glands with EMC springs, the cable shield must be firmly connected to the EMC spring.
- Page 11 Technical Note M212202EN-A In weather stations with rubber flanges, check that the sensor cable shields have been grounded to the grounding rail. Check that all unused wires have been isolated with a shrinkable tube or electric tape. 11 (11)