beamline_wiki/docs/General purpose/Components/Gas-flowmeter.md

For the He flow to the flight tube or other components we have a flow meter mounted to the back side of the KB mirrors.

This is a Q-Flow from Voegtlin without calibration. The scale is given in millimeters.

{width=381 height=195}

A rough calibration with N2 yields for the flow rate:

{width=517 height=377}

When used with He gas this has to be multiplied with a factor of 1.25 (at 20 deg C and atmospheric pressure). With a reading of 120 mm the corresponding gas flow is 22 L/min of He.