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Message ID: 2502     Entry time: Tue Aug 4 17:08:00 2020
Author: Raymond 
Type: Update 
Category: Cryo vacuum chamber 
Subject: 19 pin MIL feedthrough and CTC100 wiring 

Used the 19-pin MIL feedthrough to run 4 platinum RTD's and a 25 Ω 100 W resistive heater to the cold head. Attachment 1 is the wiring diagram for the feedthrough and the D-sub connector to the CTC-100 temperature sensor. Attachment 2 shows the three RTDs placed on the cold head. It also shows the thermal anchoring of all lead wires. Attachment 3 shows the RTD attached to the cooler below the cold head using cigarette paper and cryo varnish (stored in the flammables cabinet in QIL).

 The Al block is a premade PT-RTD integrated mounting setup, which was placed on some indium sheet bits and clamped down with a screw and belleville washer. The other two cold head sensors are pressure fit to the cold head by a spring loaded mini dog clamps, and one of the two has some indium underneath the RTD to see if there is any value in doing so going forward with these mounting springs. The glued sensor was attached by painting a thin layer of cryo varnish on the cooler, adding a strip of cig paper, layer of varnish, press in sensor, another strip of paper, paint over all of it with a last thin layer of varnish that reaches beyond the bounds of the paper strips. 

Attachment 1: QIL_TempSensor_MIL19pinWiringDiagram.pdf  143 kB  Uploaded Fri Aug 7 11:47:13 2020  | Hide | Hide all
Attachment 2: external_tank_RTDs_1.pdf  241 kB  Uploaded Fri Aug 7 12:16:04 2020  | Hide | Hide all
Attachment 3: F6D69C6A-7168-4D06-B02A-E83CE8AFE524_1_105_c.jpeg  160 kB  Uploaded Fri Aug 7 12:16:44 2020  | Hide | Hide all
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