Health, safety, environment and quality
ROUND UP
Y
et another fully fail-safe inductive sensor is launched by industrial
sensor manufacturer,
ifm electronic
. The new GG851S fail-safe
inductive sensor simplifies some of the safety-related applications
quite simply by operating normally closed.
The safe-state, with the outputs high, is given when the target is
not present, ie outside the 10 mm enable zone, in the area known
as the safe switch-off zone. If a metal object is in the enable zone,
the outputs are switched on. The sensor also has a wider operating
voltage than earlier versions, allowing operation down to 12V DC.
The operating principle can be illustrated using the example of
gantry crane: a fail-safe sensor monitors the position of the crane on
the gantry. With a normally open version the sensor would need to
be damped along the whole travel in order to maintain the safe func-
tion; the sensor was undamped only at the stop positions.This new
version allows mounting of only one target each at the beginning and
the end of the crane track, which saves material and mounting costs.
The GG851S sensor has two OSSD outputs for connection to a
safety relay or PLC .The diagnosis of the different operating states is
made via LEDs. No special target is required and the GG851S is fully
flush mountable.The fail-safe sensor is certified to ISO 13849-1 PL d,
IEC 61508 SIL 2 and IEC 62061 SIL cl2. Connection is via a standard
M12 connector, which is available from ifm’s EVC range.
Enquiries: Chris Cronjé.Tel. 012 450 0370 or email chris.cronje@ifm.
com.
T
he video-based D-VTA 100-10 thermogra-
phy system from Durag supplies online
information directly from the combustion
chamber to assist the operator in adjusting
the complete combustion process optimally.
The systemprovides a real-time video image
as well as a real-time online thermographic
analysis of the temperature distribution
inside the combustion chamber.
The thermographic system is an optical
pyrometer based on advanced video data
processing technology. A high quality picture
with a wide angle of view and a small sensor
diameter is obtained with a boroscope lens.
The CCD camera is mounted in the cold part
of the lance, thus allowing sensitive equip-
ment to be mounted outside of the combus-
tion chamber, allowing continuous use at
high temperatures. A sapphire lens and air
flushing are used to protect the boroscope
tip from slag and ash particles.
In addition to the video image, the system
provides methods for the thermal analysis of
the spatial temperature distribution inside
the combustion chamber. It can determine
the temperature within freely definable areas
and along lines (Region Of Interest - ROI, and
Line Of Interest - LOI). The system is also
capable of continuous parallel temperature
analysis in all ROIs with continuous display
of the absolute temperatures on screen. Oth-
er capabilities include the ability to perform
continuous temperature analysis along all
LOIs with continuous display of the absolute
temperature profile through the combustion
chamber and the detection of the actual
thermal position of the combustion zone.
To guarantee the largest and unobstructed
observation range, the sensors, along with
their optical systems, are directly moved into
the combustion chamber.To withstand high
temperatures between 700°C and 1 600°C
(typical for these furnaces) the sensors are
air or water cooled. All parts which may be
affected by the flue gases are made of special
stainless steel to cope with the chemical reac-
tions and high temperatures of the flue gas.
Durag is represented locally by
OEN
Enterprises
.
Enquiries: Mike Andrews.Tel. 011 675 4447 or
email
.
New fail-safe inductive sensors
Video-based thermography for furnace control
41
July ‘13
Electricity+Control
