Differences

This shows you the differences between two versions of the page.

--- installation_fp_sci [2019/07/01 09:08]
pereira [Vent focal-plane chamber]
+++ installation_fp_sci [2019/07/01 09:28]
pereira [Vent focal-plane chamber]
@@ Line 15: / Line 15: @@
   * Gently open the manual venting valve until the pressure displayed in the Pirani Gauge (see figure below) increases by ~1 torr every 15 seconds (see figures below)
 {{:wiki:fp-pirani.jpg?350|FP chamber manual venting valve}}
+  * Make sure that pressure inside the CRDCs and IC detectors (LabView) increase at the same rate than the pressure in the chamber. Otherwise, stop the venting process inmediately.
   * Wait until the chamber is vented (few hours). The **I261PG** Pirani Gauge should read slightly above atmospheric pressure (due to the dry N2 flow pumped to the chamber). The window **VENT STATUS** in PanelMate should display "VENT VALVE OPEN". The window **PUMPDOWN STATUS** should display "PUMPDOWN STOPPED"
   * Meanwhile, turn the turbo pump off using PanelMate **S800vac**: select box **Turbo pump focal plane detector I260TP** can clock "Stop". It will take several minutes to fully stop (you can check the turbo-pump speed in box **I260TP SPEED**, or using EPICS channel **I260TP_FR_RD**)

S800 Documentation