Gill Instruments Ltd
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WindObserver II (WindObserver FC)
Page 9
Issue 2
Doc. No. 1390-PS-0011
June 2007
6.2. Bench system test
Note
: Prior to physically mounting the WindObserver II (WindObserver FC) 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 9.6.
6.3. Cabling
Cable type
A RS422 compatible cable should be used, with the number of twisted pairs matching the
application.
Generic description
– Twisted pairs with drain wire, screened with aluminised tape,
with an overall PVC sheath. Wire size 7/0.2mm (24 AWG)
The table shows some suitable manufacturers’ references; other manufacture’s equivalents
can be used.
Table 1
No. of pairs Gill ref.
Belden
ref.
Batt electronics
ref.
2 -
9729
-
3
026-02660
9730
91030
4 026-03156
9728
91199
9
026-02663
8774
91009
Cable length
The typical maximum length at 9600 baud is 1km (3200ft), 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.
See also Section 6.1
Cabling and junction box
The WindObserver II (WindObserver FC) unit is fitted with a flying 9 pair cable attached
(15m long). This must be terminated in a suitable terminal box to IP66 or better, fitted
with glands to prevent moisture ingress.
The cable type from the terminal box to the host system must be as specified above. 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,
such that the cable is not under stress at the cable glands.
The gland area at the base of the WindObserver II (WindObserver FC)
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. If an IP66 rating is essential or the unit
is mounted other than ‘right way up’
use the gasket
provided in the mounting kit.