Gill Instruments Ltd
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WindObserver 65
Page 12
Issue 4
Doc. No. 1390-PS-0039
June 2016
6.2.
Bench system test
Note: Prior to physically mounting the WindObserver 65 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. If both the (optional) Heating and Analogue outputs are utilised, then a 9 pair
cable is required.
Generic description
– Twisted pairs with drain wire, screened with aluminised tape,
with an overall PVC sheath. E.g. 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.
Cable
Gauge
2
-
9729
91071
24
3
026-02660
9730
91030
24
4
026-03156
9728
91199
24
6
-
8778
91011
22
9
026-02663
8774
91009
22
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. 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
If the WindObserver 65 unit is fitted with a flying 9 pair cable attached 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 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 65
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 and apply additional
sealing compounds around the base.
