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WWAT
Overview
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Wireless monitoring of instrumentation
sensors (4 - 20 mA) such as
temperature, flow, pressure,
voltage, current, water/fuel
levels, weight, speeds, revolutions,
etc. with existing SCADA software
systems have been a requirement
in the industry for many years.
Typical limitations with
wired telemetry systems are:
- Cable distance restrictions
- Cables are vulnerable
to aging, breaking and cable
theft
- Cost of digging cable
trenches and laying cables
- Damage of equipment
due to lightning
- Maintenance of wired
telemetry systems
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ESS has considered the above
shortcomings and has designed a
unique new system called WWAT
(Wireless Wide Area
Telemetry) that
enables wide area
telemetry by virtue of wireless communications and
usage of other third party communications infrastructure.
The application of
remote
telemetry dictates that the system is almost exclusively
installed outdoors. The outdoors installation lays down unique
challenges with regards to lightning and surge protection. The WWAT platform was
designed with these constraints in mind and offers multiple layers of
protection.
On the sensor side, the sensors
are connected to
the WWAT-488 module. The wireless
transmission is achieved
by means of conventional radio,
radio trunking or GSM. Ethernet
LAN connectivity
to existing wide
area networks is
also possible.
On the control side, the
client SCADA is connected
to the WWAT OPC Server ensuring
seamless communication between
the WWAT modules and the client
SCADA.
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Benefits
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No
need
for
long
distance
cabling
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ESS
OPC
Server
can
be easily
integrated
to well
known
SCADA
systems
such
as:
Adroit;
Citect;
Fix;
Honeywell,
In-Touch,
Siemens,
etc.
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Event
driven
(non
polling),
with
health
checks
(Alive
messages)
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ESS
WWAT
OPC
has
configuration
facilities
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Modular
Concept,
easy
to add
WWAT
nodes
and
concentrators
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Various
wireless
interfaces:
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Conventional VHF or UHF data radio
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Radio Trunking
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GSM
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Ethernet LAN
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Interfaces
to Modbus
PLC's
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ESS
is a
South
African
company
with
in-house
design
team
and
with
proven
track
record
in wireless
telemetry
applications
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Typical
Wireless Wide Area Telemetry System
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Typical
WWAT Application Fields
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Gas concentration monitoring in smoke stacks
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This application makes use of
primarily the analog inputs. It is typically used with
an Ethernet / Wireless LAN connection so as to obtain trending
information on the SCADA.
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Temperature monitoring in cooling facilities or over-temperature in electrical
equipment (electrical motors, pumps, power transformers)
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This
application makes use of primarily the analog inputs. It is typically used with big on-change deltas so as to
only send extreme changes to the SCADA. This type of application is
ideal to implement with low bandwidth radio equipment.
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Pump operation monitoring
in water pumps and environmental protection
applications
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This application makes use of primarily the digital
inputs. It can use either SCADA
monitoring equipment or a WWAT to WWAT set-up, for small
installations. The digital outputs on the WWAT can be remotely
activated from the SCADA and is typically used to implement safety
overrides on pumps. This type of application is ideal to implement with low
bandwidth radio equipment.
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Remote equipment site monitoring such as RF high-sites
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This application makes
use of primarily the digital inputs. This type of application is ideal
to implement with low bandwidth radio equipment.
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Stock
monitoring applications in the chemical storage industry, etc.
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The
analog sensing capability is used together with load cells and floats
to monitor the levels of storage silos. This application makes use
of the a combination of analog and digital inputs. This type
application is ideal to implement with low bandwidth radio equipment.
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