Casella CEL Automatic weather station - Manual (Page 11)

1. Take the smaller diameter AIR TERMINAL ROD and screw it into the
threaded hole in the centre of the top cross arm.
DO NOT REMOVE THE NUT FROM THE AIR TERMINAL ROD.
Once the ROD has been threaded fully into the hole tighten the nut
down on to the cross arm.
2. Next take the TEST CLAMP and secure it to a hole at the bottom of
either of the frame uprights, flat side towards the frame.
Thread the bolt through the frame into the TEST CLAMP and tighten.
3. Loosen the bolt on the outside of the TEST CLAMP sufficiently to allow
the flat DOWN CONDUCTOR to be inserted into the TEST CLAMP.
Having inserted the DOWN CONDUCTOR, secure it to the TEST CLAMP
by tightening the bolt, ensuring that the bolt presses on to the bare
surface of the DOWN CONDUCTOR.
4. Remove the FIXING CLAMP from the EARTH ROD at the free end of the
DOWN CONDUCTOR.
Then drive the EARTH ROD into the ground.
The EARTH ROD should be driven in until approximately 15 cm of the
rod is protruding from the surface.
5. Replace the FIXING CLAMP over the end of the EARTH ROD and DOWN
CONDUCTOR and clamp the two together by tightening the clamp bolt.
Ensure that the EARTH ROD is located in the vee of the FIXING CLAMP
and the DOWN CONDUCTOR lies against the inner flat surface under
the clamp bolt.
2.5 Fitting & Deploying Sensors
The sensor locations depend upon the specific installation arrangement and site
details. The sensors may be physically attached to the weather station frame or
can be remotely mounted on a supporting structure such as a tower or tall
building. Refer to Section 2.2 Siting and to the automatic weather station
Assembly Drawings to understand typical sensor locations.
Rain Gauge
Deploy the rain gauge at least 4 m from the frame. Level the tipping bucket
using its integral spirit level. Secure the bucket to a concrete base or paving slab
using M8 Rawl bolts.
Carefully remove any restriction, such as an elastic band that may
have been fitted to prevent the bucket from moving during transit, and check
that the bucket pivots freely.
Wind Direction Sensors
Align the wind direction sensor so that the two dots located on the base of the
sensor or the “N” label face North. Generally, wind measuring sensors should be
located on the top cross arm of the weather station frame.
All wiring from the sensors should be routed tidily to the enclosure
following the desired route. The cables in most installations are protected by
plastic coated steel conduit. Secure the cables and conduit to any structures
using suitable cable ties. Avoid putting any cables under stress or in locations
where damage is likely to occur.
Passing cables through conduit may be made easier by using an
electricians “wiring mouse”.
Assembly & Commissioning
Page 11 of 34
Automatic Weather Station
Assembly & Commissioning Handbook