Positek's novel inductive sensor technology can now be used
to produce linear or rotary Intrinsically
Safe sensors for use in hazardous areas with potential risk of explosive gases. vapours and dust. In an unusual situation, Sira Certification
Service has been able to provide Positek with the Intrinsically
Safe qualification for an electronic system in any sensor produced
using the patented PIPS® technology.
Bob Cooper, Sira's General Manager, commented, "Sira
engineers adopted a flexible approach to achieve certification
for the many varied mechanical variants of Intrinsically Safe
sensors without imposing burdensome technical restrictions. The
standard PIPS® technology electronic
system only needed slight modification to meet the qualification
requirements. In addition, Positek received a most unusual occurrence
of a zero non-compliance count on the ATEX quality system audit
carried out by Sira."
This means that Positek can produce a wide range of ATEX approved
Intrinsically Safe position sensors for use in hazardous environments. The product range includes sensors
for linear, rotary and tilt motion, covering linear displacements
up to 600mm and rotational movements up to 160°. Because the qualification
for Intrinsically Safe sensors is only restricted to the electronic
circuit design, the mechanical design of the sensor is flexible.
Therefore, Positek can make custom designed Intrinsically
Safe sensors with the qualification in addition to their standard
products.
Each of the Intrinsically Safe sensors produces a 0.5 to 4.5V
signal which is transmitted to a barrier in the safe area. The
barrier is an amplified galvanically isolated type produced by
Pepperl and Fuchs. The barrier controls the maximum voltage and
current levels supplied to the sensor and then produces an amplified
0 to 10 voltage or 4-20mA current signal for use in the remainder
of the control and monitoring system.
The sensors are certified for use with a cable up to 150m
long. The development of the sensors has involved close co-operation
between Pepperl and Fuchs and Positek to ensure that the barriers
and the Intrinsically Safe sensors operate together and meet
the intrinsic safety requirements.
Positek's Intrinsically Safe sensors provide an unique blend
of performance, durability, ease of use and cost effectiveness.
The typical performance of the sensors is ± 0.25% linearity
with temperature stability of ± 0.01%/°C. Each sensor is
supplied ready calibrated which saves installation time. The
sensors offer distinct advantages over other sensors such as
LVDTs and offer improved durability and robustness compared with
potentiometers. The sensors are designed to survive the most
hostile environments without the need for any additional protection.
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Positek's
Atex Certified Intrinsically Safe Sensors
