User manual

1
Instructions for Use
Changes in Leak Rate with Variation in Room Temperature
18/36 Variable Leak Valve User Manual / 87-400-085-01 (D)
Changes in Leak Rate with Variation in Room
Temperature
Changes in room temperature will cause changes in leak rate - as the
temperature rises, the leak rate increases. A leak setting should be
made in the range of interest and then mild heat applied to raise the
temperature of the valve to the maximum expected value. If the
resulting change in leak rate is not acceptable to the intended
experiment, some means of temperature control should be used.
Bakeout Procedure
Bakeout in Open Position
a No special steps are required to bake the leak valve in the open
position.
b A leak that has been set with the valve at room temperature will
increase due to thermal expansion as the valve is heated during
bakeout. Monitoring of system pressure and readjustment of the
leak is necessary if a constant leak is desired during temperature
cycling.