Emerson Rosemount 705, Справочное руководство

Страница: 22 / 70

18
Reference Manual
00809-0200-4705, Rev AB
Mounting
May 2017
Mounting
3.4 Remote antenna (optional)
The remote antenna option provides flexibility for mounting the Rosemount 705 Totalizer based on
wireless connectivity, lightning protection, and current work practices.
The remote mount antenna kit includes coaxial sealant that is for the cable connections, lightning
arrestor, and antenna.Find a location where the remote antenna has optimal wireless performance.
Ideally this will be 15–25 ft. (4.6–7.6 m) above the ground or 6 ft. (2 m) above obstructions or major
infrastructure. To install the remote antenna, use one of the following procedures. The WN option is
25 ft. (7.6 m).
3.4.1 WN remote antenna option
1. Mount the antenna on a 1.5- to 2-in. pipe mast using the supplied mounting equipment.
2. Connect the lightning arrestor directly to the top of the Rosemount 705 Totalizer.
3. Install the grounding lug, lock washer, and nut on top of lightning arrestor.
4. Connect the antenna to the lightning arrestor using the supplied LMR-400 coaxial cable ensuring the
drip loop is not closer than 1 ft. (0.3 m) from the lightning arrestor.
5. Use the coaxial sealant to seal each connection between the wireless field device, lightning arrestor,
cable, and antenna.
6. Ensure the mounting mast and lightning arrestor are grounded according to local/national electrical
code.
Note
Any spare lengths of coaxial cable should be placed in 12-in. (0.3 m) coils.
When installing remote mount antennas for the transmitter, always use established safety procedures
to avoid falling or contact with high-power electrical lines.
Install remote antenna components for the transmitter in compliance with local and national electrical
codes and use best practices for lightning protection.
Before installing, consult with the local area electrical inspector, electrical officer, and work area
supervisor.
The transmitter remote antenna option is specifically engineered to provide installation flexibility while
optimizing wireless performance and local spectrum approvals.
To maintain wireless performance and avoid non-compliance with spectrum regulations, do not change
the length of cable or the antenna type.
If the supplied remote mount antenna kit is not installed per these instructions, Emerson is not
responsible for wireless performance or non-compliance with spectrum regulations.