Gill Instruments Ltd
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WindObserver II Pipe Mount
Page 9
Issue 04
Doc. No. 1390-PS-0009
August 2009
6.2. Bench system test
Note: Prior to physically mounting the WindObserver II (Pipe Mount) in its final location,
we strongly recommend that a bench system test be carried out to confirm the system is
configured correctly, is fully functional and electrically compatible with the selected host
system and cabling (preferably utilising the final cable length). The required data format,
units, output rate, and other options should also all be configured at this stage. If an
Integrity Check Chamber (ICC) has been purchased refer to Section 10.6.
6.3. Cabling
Cable type
A RS422 compatible cable should be used, with the number of twisted pairs matching the
application.
Generic description
No. of pairs Gill ref.
Belden
ref.
Batt Electronics
6
026-03508
9806
91021
Cable length
The typical maximum length at 9600 baud is 1km using the recommended cable. If any
problems of data corruption are experienced (due to, for example, a high local electrical
‘noise’ level), then a lower baud rate should be used. Alternatively, a thicker or higher
specification cable can be tried. . If a heated unit is used on longer cables than supplied,
consideration should be given to powering the heater using lower gauge wire or
paralleling wires to reduce volt drops.
Cabling and junction box
The WindObserver II (Pipe Mount) unit is fitted with a flying 6 pair cable attached (4
metre long). This must be terminated in a suitable manner to prevent moisture ingress.
If any cable is likely to be exposed to mechanical damage, it must be enclosed in a suitable
conduit or cable tray. The cable must be securely fixed with cable clamps or equivalent at
regular intervals such that the WindObserver cable gland does not support the cable
weight.
The gland area at the base of the WindObserver II (Pipe Mount)
should not
be directly
exposed to moisture, as whilst the gland is sealed when mated, the anemometer is vented
to air at the base to avoid pressure build up.
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