The original ion gauge , model UV-24P was replaced with Agilent model UHV-24. Original ion gauge collector was shortened and read the pressure lower!
Another ion- gauge was added next to normal ion gauge port. Normal port has a built-in mesh screen, therefore a mesh screen installed on the nipple port of addition ion-gauge. Both ion gauges are the same model (UHV-24) and cable and controller board are compatible with gauges.
Settings on the controller is adjusted for this model.
Background pressure: 2e-7 torr