Transcript DeltaV Control Performance Suite

Chapter 3
Wireless Field Devices
Wireless Devices - Process Industry

Most wireless field devices designed for use
in the process industry are based on either
the international WirelessHART standard IEC
62591, or the ISA100.11a national standard.

All products claiming HART Protocol
compliance must be independently tested
and verified by the HART Communication
Foundation. Devices that pass this testing
and are registered may display the logo.

The ISA100 Wireless Compliance Institute
(WCI) has been established by ISA to certify
device conformance to the ISA100.11a
standard. Successfully passing the WDI
conformance test is the basis for using the
ISA100 Wireless Compliant logo and
registration.
Certified Wireless Devices
WirelessHART
ISA100
Battery Replacement

The power modules used in
wireless devices are designed
to be periodically replaced as
illustrated in Figure 3-3. The
power module used in some
devices is designed to be
intrinsically safe, which allows
field replacements without the
need to remove the
transmitter from the process.

The lithium-thionyl chloride
battery cells used by many
wireless devices provide high
energy density, long shelf life
and a wide working
temperature range.
Example – Wireless Pressure and
Temperature Transmitter

The communication update
rate that is configured for a
device has a direct impact on
the expected battery life, as
does the service
temperature.

In most cases, the
communication update rate
may be selected by the end
user. Typical examples of
how update rate and
operating temperature impact
battery life are shown.
Using an Adapter to Access Device
Diagnostics and Measurement

WirelessHART adapters and ISA100
adapters have been developed that
access and wirelessly communicate
diagnostic information. Such adapters
use power drawn from the wired
transmitter current loop.

An adapter can also be installed on a
traditional wired transmitter for
wireless access to the measurement
values of devices used for monitoring
or control. This approach may be
especially useful when working with an
existing wired transmitter or when
installing new four wire transmitters
that have a local source of power.