8400 Series Wireless Transceivers
The 8410 Wireless Field Transceiver (WFT) & 8420 Wireless Base Transceiver (WBT) are ideally suited for tank gauging, bulk storage applications in refineries, tank farms, terminals and remote tank facilities. Together, they provide a complete solution for wireless transmission of tank gauging data from field instruments to the control room system.
- Secure communications between your instruments and the control room system - Proprietary Frequency Hopping Spread Spectrum (FHSS) technology
- Reliable communications, even in areas with extreme RF background noise (military tested, MIL-STD-410) - 900 MHz frequency range
- Supports the complete range of Varec tank gauges, transmitters or third-party manufactured devices - ¾” NPT connections and RS-232/485 e.g. MODBUS communications
- Suitable for large facilities or remote areas; simultaneous slave/repeater functionality and line-of-sight transmission up to 20 miles
- Simple, low cost installation; AC or DC operation and remote placement of antenna
Varec Wireless System
The 8410 Wireless Field Transceiver (WFT) provides secure wireless communications between the field instrument and the 8420 Wireless Base Transceiver (WBT) located in the control room. Both units are able to provide simultaneous slave/repeater functionality and line-of-sight transmission up to 20 miles. They function over point-to-point or multi-point systems. Traditionally, a multi-point network is used in applications where data is collected from many instruments and reported back to one central site.
Point-to-Point Systems. A point-to-point system is limited to one master and one slave transceiver. Repeaters may be added to extend the reach of the network, but no other master or slave may be added.
Multi-Point Systems. In a multi-point system, the transceiver, designated as a master, is able to simultaneously be in communication with numerous slaves. In its simplest form, a tank gauging multi-point network functions with the master (8420 WBT) broadcasting its messages to all slaves (8410 WFT) and the slaves responding to the master when given data by the connected tank gauge or tank gauge transmitter.
Antenna
Varec offers a wide range of antenna and mounting options to suit your facility’s specific needs. Please consult with your local Varec sales representative before selecting an antenna option.
Placement of the wireless units is likely to have a
significant impact on its performance. In general, units
with a higher antenna placement and a direct line-of-sight
will have a better communication link. To improve
the data link, Varec offers directional and omni directional
antennas with cable lengths ranging from 3
to 200 feet. When using an external antenna, placement
of that antenna is critical to a solid data link. Other
antennas in close proximity are a potential source of
interference. It is possible that an adjustment as little as
2 feet in antenna placement can solve noise problems.
In extreme cases, such as when the transceiver is
located close to pager or cellular telephone
transmission towers, the standard and cavity band pass
filters can reduce the out-of-band noise.
Directional Antennas provide increased RF range in one direction. Each antenna has been optimized to achieve superior performance. A type N termination is located at the end of the boom with a fully sealed driven element for complete protection against humidity, acid rain or salt spray. Mounting brackets allow for either vertical or horizontal polarization. Manufactured from aluminum and finished with a black polyester powder coating, these antennas provide outstanding durability and superior performance in all weather conditions. All models are DC grounded. Note!: Option OU mounts directly to the 8410. All other options require cabling and mounting.
Omni-Directional antennas provide 360 degree coverage for communication in any direction. Each antenna is base matched, half wave and encapsulated in a heavy duty fiberglass radome with a thick walled aluminum mounting base for reliable long term use. All models are DC grounded.
Mounting Brackets. A wide range of mounting options, such as tank roof hand rail conduit, stand pipes or posts, are available to allow antennas to be installed in the optimum location (see order codes for descriptions).
