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--- gas_handling_system [2013/12/13 20:59]
pereira
+++ gas_handling_system [2013/12/13 21:16]
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-Preparation of Gas bottles
+===== Preparation of Gas bottles =====
-	In Data-U6
+==== In Data-U6 ====
-	Ensure I265GV is closed to isolate focal plane vacuum chamber from the rest of the beamline
+      * Ensure I265GV is closed to isolate focal plane vacuum chamber from the rest of the beamline
-	Confirm that the focal plane chamber is under vacuum
+      * Confirm that the focal plane chamber is under vacuum
-	Confirm that the only open gas handling system valves are 4, 5, 6, 20, 21, and 22
+      * Confirm that the only open gas handling system valves are **4, 5, 6, 20, 21, and 22**
-	In the S3 vault
-	Ensure that the gas handling system roughing pump is running and has a good vacuum
-	The pump sits on the floor under the focal plane behind the south support post (PICTURE GOES HERE)
-	The display unit for the pressure at the pump has a needle indicator and is mounted under the focal plane on the south support post (PICTURE GOES HERE)
-	Ensure that the main valves on the gas bottles are open
-	Ensure that the gas bottles are not empty
-	The gas regulators are not normally adjusted.  They should all be set to provide a pressure around 20 psi.
-	The bottle supplying the P-10 gas for the ion chamber is secured to the cross-brace of the south support for the focal plane chamber.  It has an electronic Ashcroft pressure gauge upstream of the regulator (toggle on and off with the “on/off” switch) and a mechanical pressure gauge downstream of the regulator. (PICTURE GOES HERE)
-	The bottle supplying CF4 (tetrafluoromethane) gas for the CRDCs is secured to the cross-brace of the south support for the focal plane chamber.  It has an electronic Ashcroft pressure gauge upstream of the regulator (toggle on and off with the “on/off” switch) and a mechanical pressure gauge downstream of the regulator. (PICTURE GOES HERE)
-	The bottle supplying isobutane (C4H10) for the CRDCs is secured to the south support post for the focal plane chamber.  It sits on a scale for monitoring the isobutane consumption – the electronic display for the scale sits on the chiller unit under the focal plane chamber.  It has a mechanical pressure gauge downstream of the regulator. (PICTURE GOES HERE)
-Filling Ion Chamber with Gas
+==== In the S3 vault ====
+      * Ensure that the gas handling system roughing pump is running and has a good vacuum
+           * The pump sits on the floor under the focal plane behind the south support post
+           * The display unit for the pressure at the pump has a needle indicator and is mounted under the focal plane on the south support post
+      * Ensure that the main valves on the gas bottles are open
+      * Ensure that the gas bottles are not empty
+           * The gas regulators are not normally adjusted.  They should all be set to provide a pressure around 20 psi.
+           * The bottle supplying the P-10 gas for the ion chamber is secured to the cross-brace of the south support for the focal plane chamber.  It has an electronic Ashcroft pressure gauge upstream of the regulator (toggle on and off with the “on/off” switch) and a mechanical pressure gauge downstream of the regulator.
+           * The bottle supplying CF4 (tetrafluoromethane) gas for the CRDCs is secured to the cross-brace of the south support for the focal plane chamber.  It has an electronic Ashcroft pressure gauge upstream of the regulator (toggle on and off with the “on/off” switch) and a mechanical pressure gauge downstream of the regulator.
+           * The bottle supplying isobutane (C4H10) for the CRDCs is secured to the south support post for the focal plane chamber.  It sits on a scale for monitoring the isobutane consumption – the electronic display for the scale sits on the chiller unit under the focal plane chamber.  It has a mechanical pressure gauge downstream of the regulator. (PICTURE GOES HERE)
-	Follow instructions under PREPARATION FOR FILLING DETECTORS WITH GAS above
-	Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr.
-	Confirm that the detector pressure as indicated by the display labeled P.T. #1 reads below a couple of Torr
-	To zero this display:
-	Click on the Slot 3 (PT1) tab to access the details page for PT #1
-	Click the Zero Sensor button
-	Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system
-	Close valve 6
-	Open valve 2; the flow reading at MFC #1 should jump momentarily
-	Fill Ion chamber
-	Enter the desired fill pressure and start the automatic filling process
-	Click on the tab labeled Slot 8 (M-card) IC to access the page with the pressure set point control
-	Enter the desired pressure (typically 300 Torr) in the field under the knob labeled Set Point
-	Click button labeled Return to AUTO Mode on left to start filling/regulation
-	Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling
-	The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior)
-	If necessary, the filling process can be stopped at any time by pressing the valve button labeled Close MFC #1
-	Open valve 9
-	The filling process will take several minutes
-	When the detector is filled, close valve 5
+===== Filling Ion Chamber with Gas =====
+  * Follow instructions under [[#Preparation of Gas bottles|Preparation of Gas bottles]]
+  * Monitor the pressure of the focal plane vacuum chamber (as read out via the I264IG ion gauge) while detectors are being filled with gas; the pressure normally stays below 5E-5 Torr.
+  * Confirm that the detector pressure as indicated by the display labeled P.T. #1 reads below a couple of Torr
+      * To zero this display:
+          * Click on the **Slot 3 (PT1)** tab to access the details page for PT #1
+          * Click the Zero Sensor button
+          * Click the Valves tab at the top of the LabView window to return to the overview display of the gas handling system
+  * Close **valve 6**
+  * Open **valve 2**; the flow reading at MFC #1 should jump momentarily
+  * Fill Ion chamber
+      * Enter the desired fill pressure and start the automatic filling process
+          * Click on the tab labeled **Slot 8 (M-card) IC** to access the page with the pressure set point control
+          * Enter the desired pressure (typically 300 Torr) in the field under the knob labeled Set Point
+          * Click button labeled **Return to AUTO Mode** on left to start filling/regulation
+          * Click the **Valves** tab at the top of the LabView window to return to the overview display of the gas handling system to monitor filling. The flow readings for MFC #1 will increase and eventually disappear as the readout value overflows the display field (this is normal behavior)
+      * If necessary, the filling process can be stopped at any time by pressing the valve button labeled Close MFC #1
+      * Open **valve 9**
+      * The filling process will take several minutes
+  * When the detector is filled, close **valve 5**
 Filling CRDC1 and CRDC2 with Gas

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