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<td WIDTH="100%" BGCOLOR="#0000ff"><p ALIGN="RIGHT"><b><font COLOR="#ffffff"
FACE="Verdana" size="2">MINIATURE OXYGEN SENSOR<br>
</font><font face="Verdana" color="#00FFFF"><small>(OS 418 : Clark-type O<sub>2</sub>)</small></font></b></td>
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<td width="51%"><font face="Verdana" size="2"><b><span>Electrode Design</span></b></font> <p><font
face="Verdana" size="1"><span <font face="Verdana" size="1">The OS-418 oxygen sensor is a
miniature, Clark-type amperometric sensor that is designed for measuring static as well as
dynamically changing oxygen levels in aqueous and physiologic fluids. <o:p></o:p></span> The oxygen
sensor consists of a pair of miniaturized electrodes immersed in a drop of aqueous
KCl electrolyte and separated from the test environment by a replaceable oxygen permeable
membrane. An outer Ag�/AgCl anode surrounds an internal platinized platinum cathode. The
5 mil (0.005") diameter high purity platinum wire cathode is fused into a glass
sheathing that fills the lumen of the outer silver body. The oxygen permeable membrane is
placed over the tip of the electrode assembly and secured with an O-ring. With the
membrane and O-ring in place, the sensor diameter is 4.5 mm (0.177"). The sensor may
be housed in an black delrin body that exposes only the membrane-covered tip of the sensor
to your test solution.</o:p></font></td>
<td BGCOLOR="#e2ebf3" WIDTH="49%"><p class="MsoNormal" style="tab-stops:.25in"><font
face="Verdana" size="2"><b style="mso-bidi-font-weight:normal"><span>General
Specifications<o:p></o:p>:</span></b></font></p>
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<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Sensor Probe
Length</span></font></td>
<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">4.182 cm</o:p></span></font></td>
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<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Sensor
Housing Length</span></font></td>
<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">2.5 cm<o:p></o:p></span></font></td>
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<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Sensor
Diameter</span></font></td>
<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">0.318 cm<o:p></o:p></span></font></td>
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<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Sensor
Housing Diameter</span></font></td>
<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">0.787 cm<o:p></o:p></span></font></td>
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<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Connector
Type</span></font></td>
<td width="50%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Modified
Amphenol Sub-Minax P/N 27.9</span></font></td>
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<p class="MsoNormal" style="tab-stops:.25in"><font face="Verdana" size="2"><b
style="mso-bidi-font-weight:normal"><span>Technical Specifications<o:p></o:p>:</span></b></font></p>
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<td width="67%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Sensor
Sensitivity</span></font></td>
<td width="33%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">0 - 150 mm Hg</span></font></td>
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<td width="67%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Response
Current for Ambient pO<sub>2</sub></span></font></td>
<td width="33%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">18 nA</span></font></td>
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<td width="67%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Time Constant
/ Response Rate (0 - 63%)</span></font></td>
<td width="33%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">4 s<o:p></o:p></span></font></td>
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<td width="67%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Bias Voltage
Required</span></font></td>
<td width="33%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">-0.7 V<o:p></o:p></span></font></td>
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<td width="67%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">Thermal Drift</span></font></td>
<td width="33%"><font face="Verdana" size="2"><span
style="font-family:
Arial;mso-bidi-font-family:"Times New Roman"">4 % / �C<o:p></o:p></span></font></td>
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<td width="51%"><p align="center"><img src="picts/OS418s.jpg" width="136" height="160"
alt="OS418s.jpg (2715 bytes)" border="2"></td>
<td BGCOLOR="#e2ebf3" WIDTH="49%"><font face="Verdana" size="1"><strong>Applications in
Research and Development</strong></font><ul>
<li><font face="Verdana" size="1">As an oxygen-level sensor in Micro-BOD (Biological Oxygen
Demand) measurements.</font></li>
</ul>
<ul>
<li><font face="Verdana" size="1">In monitoring oxygen levels in cell cultures.</font></li>
</ul>
<p> </td>
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<td width="51%"><font face="Verdana" size="2"><b>Principle of Operation</b></font><p><font
face="Verdana" size="1">Using a constant voltage source (potentiostat, OSI-1 or OSI-2), a
constant -0.7 V bias voltage is applied between both electrodes [cathode (-) and anode
(+)] of the sensor. In the absence of any other oxidizable species (and there should not
be any in aq. KCl), this results in a current that is directly proportional to the RATE at
which molecular oxygen is electrolytically discharged at the cathode. The steady state
discharge rate is dependent upon diffusion of oxygen across the polymer membrane that
covers the two electrodes. If all the oxygen that arrives at the cathode is summarily
discharged, then the discharge rate (current) is directly proportional to the flux (amount
per unit area per unit time) of oxygen across the membrane. This flux is directly
proportional to the extra-membrane concentration of dissolved oxygen. In this way the
observed current is made indirectly proportional to the oxygen concentration.</font></td>
<td BGCOLOR="#e2ebf3" WIDTH="49%"><font face="Verdana" size="1"><b>The OS 418 Oxygen
Sensor Package Contains:</b></font><small> </small><p><font face="Verdana" size="1">1
Oxygen Sensor<br>
5 reusable O-rings<br>
1 Sheet of 0.001; Polyethylene Membrane<br>
1 Membrane Installation Tool (white, cone-shaped) 1 Sensor Housing (two parts) (black
delrin)<br>
1 Oxygen Sensor Operations Manual<br>
</font></td>
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<td width="51%"><p align="center"><img src="picts/OS418c.jpg" width="139" height="95"
alt="OS418c.jpg (2109 bytes)" border="2"></td>
<td BGCOLOR="#e2ebf3" WIDTH="49%"><p class="MsoNormal" style="tab-stops:.25in"><font
face="Verdana" size="1"><strong>Requirements</strong></font><ul>
<li><font face="Verdana" size="1">Requires Sensor Cable Model SC9BNC (sold separately):
Model SC9BNC is a flexible coaxial cable with a female Sub-Minax connector on one end (to
the OS-418 oxygen sensor) and a BNC connector on the other to the OSI-2 instrument.</font></li>
</ul>
<ul>
<li><font face="Verdana" size="1">Requires Oxygen Sensor Instrument Model OSI-1 (single
channel) or Model OSI-2 (dual channel) (sold separately). Model OSI-1 is a single channel
oxygen sensor interrogation system for use with the Model OS-418 oxygen sensor.</font></li>
</ul>
<ul>
<li><font face="Verdana" size="1">For best results, the OS-418 requires thermal regulation
of the test solution and electrode to avoid appreciable thermal drift.</font></li>
</ul>
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<hr align="center">
<font SIZE="-1" FACE="Verdana,Arial">
<p align="center"></font><font FACE="Verdana,Arial" size="1">Last Revision 08/12/01; (c)
2000-2001 ABTECH Scientific, Inc.</font></p>
<p align="center"><font FACE="Verdana,Arial" size="1"><b>Contact: Ann M. Wilson, </b>Manager,
<br>
Applications Development ABTECH Scientific, Inc.<br>
911 East Leigh Street G24, Richmond, Virginia 23219<br>
Telephone Number: +1-804-783-7829 Fax Number: +1-804-783-7830<br>
e-mail: <a HREF="mailto:[email protected]">[email protected]</a></font></p>
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