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--- installation_fp_sci [2023/08/17 12:39]
pereira [Emptying Detectors]
+++ installation_fp_sci [2023/08/18 10:19] (current)
noji [Zeroing PTs]
@@ Line 77: / Line 77: @@
     - If CSET is not set to **300 Torr**, adjust MFC1 back to 25 sccm when the setpoint is reached.
   - The control valve for the IC vessel is set to react slowly as the vessel has a long pressure period. The valve will not “wake up” until 300 Torr is reached on PT1. This is okay as long as the control valve begins to open by this point. The pressure change is slow enough that over the next hour the valve will open enough to catch the pressure before it exceeds **305 Torr**, well within the operating limit (500 Torr).
-  - The PID controls for each vessel are calibrated to maintain their respective setpoints to within +/- 0.1 Torr. If the operator notices a larger variation after an hour of PID control, notify the Rare Isotope Operations Vacum Group.
+  - The PID controls for each vessel are calibrated to maintain their respective setpoints to within +/- 0.1 Torr. If the operator notices a larger variation after an hour of PID control, notify the Rare Isotope Operations Vacuum Group.
+===== Zeroing PTs =====
+  * When readings of the capacitance manometers (PT1 [S800_GHS:CMG_D2708A:VP_RD], PT2 [S800_GHS:CMG_D2703A:VP_RD], and PT3 [S800_GHS:CMG_D2708C:VP_RD]) are off (e.g. 1 Torr when pumped down), these need to be zeroed.
+  * **Before “zeroing” a pressure gauge. Make sure it is completely bottomed out.** This would correspond to the GHS being in “Vent” mode and the TMP being on. If the IG is on and shows that the system is under High Vacuum (<10-3 Torr) you can go ahead and zero the gauge.
+  * Here are instructions with screenshots by Josh:
+    * {{::zeroingpressuregauges1.png|}}
+    * {{::zeroingpressuregauges2.png|}}
+    * {{::zeroingpressuregauges3.png|}}
+  * The relevant PVs are "ZERO_CMD" instead of "VP_RD", e.g. S800_GHS:CMG_D2708A:ZERO_CMD for PT1. Send "1" to zero these PTs.
 ====== Opening/closing FP chamber ======

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