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<p class="MsoNormal"><span style="color:#1F497D">Hi Dan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We experienced a similar situation: two or three times our Cl<sub>2</sub> detector (Dragger) installed at the gas cabinet in our Gas Pad showed around 1TLV for a minute. The last time it happened we solved the
mystery: a constructor parked his big diesel van very close to the door of our Gas Pad. By the end of the day he entered his car, started it and went away. The smoke from the car escape was sucked into the Gas Pad (under exhaustion) and triggered the detector.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">These detectors can be triggered by a quite large list of gases. Some of them Sulfur compounds, present in Diesel combustion.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I can’t say this is your case, but that was what happened to us.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Shimon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The Unit for Nano Fabrication<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The Hebrew University of Jerusalem<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Israel<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Pulver, Daniel - 0835 - MITLL<br>
<b>Sent:</b> Thursday, 18 June 2020 19:25<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Cc:</b> Eastwood, Scott - 0835 - MITLL <Scott.Eastwood@ll.mit.edu><br>
<b>Subject:</b> [labnetwork] Midas Cl2 detections<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Labnetwork:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have been having issues with our Honeywell Midas CL2 detectors in one of our research labs. On 3 different occasions we have seen a detection of approx. ½-1 TLV (.25-.5PPM) for <1 minute duration. In all 3 cases we have done investigations
without finding the root cause. We are starting to wonder if it is the sensors themselves? All 3 were replaced at about the same time (Jan/Feb 2020).
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone else been having issues with these devices?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dan<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#000066">Dan Pulver<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#000066">Microelectronics Laboratory Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#000066">MIT Lincoln Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#000066">781-981-1716 office<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="color:blue"><a href="mailto:michelle.simoes@ll.mit.edu">daniel.pulver@ll.mit.edu</a><o:p></o:p></span></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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