Gill GMX100, User Manual

Page: 28 / 144

Gill Instruments Ltd
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MaxiMet Page 28 Issue 3
Doc. No. 1957-PS-021 May 2018
5. INSTALLATION
5.1. General Installation Guidelines
5.1.1 Interference
As with any sophisticated electronics, good engineering practice should be followed to ensure correct
operation.
Always check the installation to ensure the MaxiMet is not affected by other equipment operating locally,
which may not conform to current standards, e.g. radio/radar transmitters, boat engines, generators etc.
Do NOT mount the MaxiMet in close proximity of high-powered radar or radio transmitters. A site survey
may be required if there is any doubt about the strength of external electrical noise.
Guidelines

Avoid mounting in the plane of any radar scanner – a vertical separation of at least 2m should be
achieved.

For radio transmitting antennas, the following minimum separations (all round) are suggested:
VHF IMM – 1m.
MF/HF – 5m.
Satcom – 5m (avoid likely lines of sight).

Ensure the product is correctly earthed in accordance with this manual.

Use cables recommended by Gill, keeping the length below the maximum allowed. Where the
cables are cut and re-connected (junction boxes, plugs and sockets) the cable screen integrity
must be maintained, to prevent the EMC performance being compromised.
If a screened cable is not available between MaxiMet and a rain gauge connection and there are
local high RF field strengths then it is advised to route cabling through a grounded metal conduit.

Earth loops should not be created – earth the system in accordance with wiring diagrams.

Ensure the power supply operates to the MaxiMet specification at all times.
5.1.2 Wind
Avoid turbulence caused by surrounding structures that will affect the accuracy of the MaxiMet such as
trees, masts and buildings.
The World Meteorological Organisation makes the following recommendations:

The standard exposure of wind instruments over level open terrain is 10m above the ground.
Open terrain is defined as an area where the distance between the sensor and any obstruction is
at least 10 times the height of the obstruction.

If mounting on a building then theoretically the sensor should be mounted at a height of 1.5 times
the height of the building.
If the sensor is to be mounted on a mast boom, part-way up a tower or mast, then the boom should be at
least twice as long as the minimum diameter or diagonal of the tower. The boom should be positioned on
the prevailing wind side of the tower.
It is important to ensure that the MaxiMet is mounted in a position clear of any structure which may
obstruct the airflow or induce turbulence.
Mount MaxiMet so as to have a clear view of prevailing winds.