List of devices of this kind

Checking camera housing pressure and pumping it out

• (the software pressure measurement, found in the LGSW lab gui WFS camera tab, gives a first order estimate)
• switch on the gauge (on 'auto off') mounted on the pnCCD camera and read the pressure
• if the pressure is close to the software limit (~50mbar), you will need to pump

• Prerequisite: the WFS camera is in state 'StartedUp' (the Peltier controller should be off, and the CCD temperature should be >0C)
• Look for the pump (check the device page for the exact location). You need the pump, the power cord, a long extension cord (most likely available at level 5) and the vacuum fittings that are stored in a small carton box with the pump.
• place the pump as close as possible to the pnCCD valve, the location behind the ARGOS rack is a good location.
• connect power and the vacuum tube from camera to pnCCD (make sure the connections are tight)
• start the pump and wait a few seconds (to have vacuum in the tube)
• open gently the camera vacuum valve and monitor in parallel the pressure (if the pressure would rise, close as fast as possible the valve)
• once fully open, let the pump run for a couple of minutes to ensure an effective pressure <1mbar
• gently closed the valve
• monitor the gauge pressure making sure it converges
• stop the pump, disconnect all, and place back the pump in the proper storage (some Argos cabinet like ArgosCabinet3, check on the device page)
• Don't forget to fill the respective twiki page of the camera, see e.g. WfsCamera1 in section 'Pressure sensor' !

Reference

Topic label

	WfsCameraPump
	aowiki.arcetri.astro.it/ARGOSPublic/WfsCameraPump