How to perform manifold calibration?

Method A

Vs

For the volume of the external reference volume device, the manifold volume is Vm, the manifold and the reference volume are evacuated, and then n mol of gas is injected. At this time, the pressure in the manifold is P1, and the absolute temperature of the manifold and the reference volume is Tm. And Ts. Then open the connection valve and the gas will expand into the interior of the reference volume and the pressure will change to P2. Because the amount of gas does not change, according to

The mass balance equation has:

The calibration is carried out at a constant temperature T, the reference volume is a ball of volume Vs, or other known volume of the object, a volume of Vc is required, and the Vc bin is connected to the manifold (volume Vm) through the valve . First, move Vs out of the Vc bin, and evacuate the Vc bin and manifold. Close the connecting valve and add na mol gas. The pressure is P1. Then open the valve and the gas will expand into another bin. After balancing, P2 is measured. According to the mass balance equation:

Next, place the reference ball inside the Vc bin, repeat the above steps, add nb mol gas, the pressure is P3, and open the valve and the pressure drops to P4, according to the mass balance equation:

Once the manifold volume Vm is determined, it can be used as a reference to determine the amount of gas adsorption.

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