7400 OPTION, SINGLE STAGE VAR TEMP

7400 Series single stage variable temperature option (741-VTA must be ordered separately; supplemental equipment requirements are argon gas cylinder with 50 psi gas regulator and 3 mm hose barb [can also be 1/4 NPT female fitting], nitrogen gas cylinder with 50 psi gas regulator and 3 mm hose barb [can also be a 1/4 NPT female fitting], an LN₂ source to fill the provided 25 L LN₂ Dewar, clean compressed air [40 psi], a mechanical vacuum pump [E2M or equivalent] kit providing sample space blank off pressure of 5 × 10⁻³ Torr for routine operation, and turbomolecular vacuum pump [Lake Shore TPS-FRG or equivalent] for annual evacuation of the transfer line [if available, turbomolecular pump can also be used for routine operation])