n
Replace gas cylinders before gas is depleted. It is best to replace a gas cylinder when the pres-
sure reads approximately 500 psi (3500 kPa) on the high-pressure gauge. Contaminants
adsorbed to the walls of the cylinder will desorb as the pressure decreases.
REPLACE A GAS CYLINDER
Analyzer
Gauge should indicate
TriStar
15 - 18 psig (103 - 124 kPag)
Regulator Pressure Settings
Exceeding the maximum recommended pressure could cause personal injury or dam-
age the instrument.
These instructions apply to working with inert gases only. When working with
hazardous gases, follow the safety procedures established by your lab.
Apower failure or loss of cryogen can result in dangerous pressures in the sample
chamber. When using toxic or flammable gases, additional venting of the cabinet may
be required.
A. Gas tubing to instrument
B. Gas regulator shut-off valve
C. Low pressure gauge
D. High pressure gauge
E. Gas cylinder shut-off valve
F. Regulator connecter nut
G. Regulator control knob
H. Brass reducer fitting
Replace a Gas Cylinder
TriStar II Plus Operator Manual
303-42800-01 (Rev M ) — Sep 2023
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