Spectrasensors OXY5500, Operator'S Manual, Page: 18 / 140

Oxygen Analyzer
1
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6 4900002239 rev. G 7-11-17
The optional sample conditioning system (SCS) contains flow devices for the
bypass loop and to control the flow to the oxygen sensor. A pressure reducing
device is also installed to reduce the pressure of the sample going to the
oxygen sensor. Depending on the application and/or ambient conditions, the
SCS may also contain a heater and thermostat to maintain the interior of the
enclosure at a constant temperature. Refer to the Sample Conditioning System
(SCS) Overview Manual for more information.
Housing for Oxygen in Natural Gas
SpectraSensors’ fiber-optic oxygen sensors are made with 2 mm polymer
optical fibers. The sensing portion is a 4 mm stainless steel probe. As a
standard, the probe is mounted in a 1/4” Swagelok Union Tee using a 1/4” x
4mm adapter as shown in Figure 1–3. Custom designs are also available.
Please contact your sales representative for more information.
Oxygen Probe
The oxygen sensor consists of a polymer optical fiber (POF) with a polished
distal tip that is coated with a planar oxygen-sensitive foil. The end of the
polymer optical fiber is covered with a high-grade steel tube to protect both the
sensor material and the POF. Refer to Figure 1–4. Typically, the fiber is coated
with an optical isolated sensor material in order to exclude ambient light from
the fiber tip.
1/4” compression “tee” flow-
through fitting
4 mm oxygen dipping probe mounts in the
compression “tee”
Figure 1–3 Standard fiber-optic oxygen sensors
fittings