SENSORS & CONTROLS
Honeywell’s Limitless WLS heavy-duty wireless limit switch is
designed for wireless position sensing or presence/absence detection in construction and transportation applications. The switch uses
a global, license-free RF wireless protocol and has up to a 1000 ft.
line-of-sight communication range.
Honeywell has developed two new products targeting vehi- cle and equipment applications. The Limitless WLS heavy-duty
wireless limit switch is designed to
offer the same mechanical life, temperature rating and sealing as the
company’s standard Micro Switch limit
switches, but with wireless capability.
The Superior Measurement, Accurate, Reliable, Thinking (SMART)
8.86 in. linear position sensor is a
noncontacting sensing product designed for absolute position sensing
in applications such as passenger
bus leveling systems, truck-mounted
crane outriggers, heavy equipment
attachment identification, hydraulic
cylinders and marine applications.
The Limitless switch, which uses
a global, license-free RF wireless
802.15.4 WPAN protocol, can be configured to allow as many as 16 devices
to communicate with a single receiver
module, Honeywell said. The 802.15.4
open protocol RF board implements
the wireless functionality with a panel-mount receiver or an industrial DIN-rail
module receiving the wireless signal.
The signal is then converted into an
output, which can be in the form of
LEDs, buzzers or electrical signals.
The switch can also provide CAN,
ProfiBus and standard Ethernet communications, according to Honeywell.
The wireless capability of the switch
allows users to reconfigure and net-
work multiple switches, making it easier
to add, subtract and relocate Limitless
switches, the company said. The ab-
sence of wires also means that there
is no wiring to install, no worn or torn
wires to mend and no cords to replace.
225 mm Analog
225 mm Digital
resist corrosion. An EN 50041 metal
enclosure allows the switch to function
in rugged environments and conforms
to IP67 and NEMA 1, 3, 4, 6, 6P, 12
and 13 standards, Honeywell said.
Battery life for the Limitless switch
can be as long as three years, depending on the application. The switch is
targeted toward construction, transportation and agricultural equipment,
as well as crane booms and lifts.
The SMART position sensor
8.86 in. linear configuration joins
Honeywell’s 2.95 in. version that
was introduced in December of
2009. They include a self-diagnostics feature and data gathering
capability for closed-loop feedback
control, Honeywell said. The sensor
uses a patented combination of an
application-specific integrated circuit
(ASIC) and an array of magnetore-sistive (MR) sensors to determine
the position of a magnet attached to
a moving object, allowing the sensor
to determine or control that object’s
position, the company said.
The MR array measures the output
of the MR sensors mounted along
the magnet’s direction of travel. The
output and the MR sensor sequence
determine the nearest pair of MR
sensors to the center of the magnet
location. The output of these two MR
sensors is then used to determine the
position of the magnet within an operating range of zero to 8. 9 in.
The noncontact design of the sensor reduces wear, improves durability and minimizes downtime, said
Honeywell. It has an air gap of up to
0.12 in. (±0.09) in. between the sensor and magnet and a variety of output options, such as analog, standard
and other RS232-type baud rates.
The sensor, which conforms to IP67
and has IP69K sealing, measures values down to 0.0055 in. for analog and
0.000137 in. for digital. dp
Honeywell’s SMART 8.86 in. linear configuration sensor detects the position of a magnet
relative to a sensor from zero to 8. 9 in. and
measures values down to 0.0055 in. (analog)
and 0.000137 in. (digital).
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