AR 2000 Operator’s Manual
89
Safety Relief Port
The Safety Relief Port is equipped with a rupture disk assembly that is designed to relieve excessive cup pressure.
At excessive internal pressure, the rupture disk breaks and propels the internal atmosphere out of the cup.
WARNING: Do not operate the pressure cell without the safety relief fitting in place. Do
not remove the rupture disc from the safety valve fitting, as this may cause the pressure
cell to crack during an overpressure condition, resulting in damage and personal injury.
The rupture disc should only be replaced by a qualified TA Instruments Service Repre-
sentative.
CAUTION: You MUST install the Safety Relief Port with the Rupture Disk such that it is
pointed to rear of the AR-G2 and away from the operator. This will prevent sample material
from being ejected toward the operator in the event of an over-pressure situation.
Rotor Assembly
The rotor assembly contains the Concentric Cylinder rotor, which is mounted on a shaft that is radially supported
by two sapphire bearings located under the rotor assembly cap. Also attached to the shaft is a four-pole magnet.
The rotor assembly installs into the cup using a threaded mount, and seals with a Kalrez® seal. A second Kalrez
seal is seated between the cap and the thumbscrew.
Figure 8.5
Pressure Cell Rotor Assembly with Cap Off (Left) and On (Right)
CAUTION: Prior to use, ensure that the two Kalrez seals are installed and are in good
condition. Replace, if damaged, with seals provided by TA Instruments only.
4-Pole
Magnet
Locking
Nut
Rotor
Thumbscrew
Cap
Kalrez
Seal
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