SAFETY
PARAMAGNETIC OXYGEN
ANALYSIS FOR SAFETY-
CRITICAL MEASUREMENTS
It can be used to sterilize medical supplies
and devices, but is more commonly used
as an intermediate in the production of
other chemicals, including ethylene glycol
(polyester fibers, fiberglass, blending
anti-freezing agents) and polyethylene
terephthalate (PET) resin, used for
packaging film and bottles.
To provide safety-critical O 2 monitoring
in the SIS, Servomex supplies the
SERVOTOUGH OxyExact 2200.
SIL 2
VOTING SYSTEMS
In a three-analyzer voting system, the
process depends on the measurement
made by the majority of analyzers. So,
if only one analyzer detects a significant
change, it is “outvoted” by the other
two and no action is taken. However,
if two analyzers detect a change, their
reading is held as correct and action is
taken. This may range from alerting the
operator to automatically halting
the process.
Voting systems allow problems with
analyzers to be detected early without
endangering the process. If two
analyzers agree on a measurement
and the third varies, it indicates a
potential problem that can be
investigated and corrected before the
process is affected.
PARAMAGNETIC TECHNOLOGY
Both the SERVOTOUGH OxyExact 2200
and SERVOTOUGH Oxy 1900 are built
around Servomex’s high-precision
Paramagnetic sensing technology, which
provides reliable, accurate and stable
percentage measurements of oxygen.
Ethylene oxide, which can be used as an intermediate in fiberglass production, is a hazardous substance.
Three of these Paramagnetic oxygen
analyzers are positioned in a voting system
on the inlet and each outlet of the reactors.
The OxyExact 2200 can also be used to
ensure the purity of oxygen feedstock (in
the 90-100% O 2 range) at the beginning
of the production process.
A high-specification process O 2 analyzer,
the OxyExact 2200 uses an intelligent
three-enclosure system that facilitates the
simplified and versatile sampling of any
flammable gas up to 100% O 2 . It does not
require pre-sample drying in many cases,
so dramatically reduces ongoing costs.
Find out more at: servo