AR 2000 Operator’s Manual
86
Specifications
Operating Specifications
The specifications for the standard pressure cell concentric cylinders are:
Stator inner radius: 14.00 mm
Rotor outer radius: 13.00 mm
Cylinder immersed height: 44.00 mm
Gap: 3500 µm (recommended)
Backoff distance: 3500 µm
Geometry inertia: 92.00 µN.m.s2 (approximate)
Sample volume: 9.5 ± 0.5 ml
Temperature range: -10 to 150°C
Maximum applied pressure: 138 bar (2000 psi)
Maximum pressure (self-pressurizing): 5 bar (72.5 psi)
Torque range about 100 µN.m to 0.2 N.m
Maximum angular velocity: 50 rad/s
Seal construction: DuPont Kalrez®
Safety Specifications
Over pressure rupture disk: 172 bar (2500 psi)
Hydraulically tested to: 414 bar (6000 psi)
Operational Limits
CAUTION: To prevent sample entering the upper part of the cell and contaminating the
bearings, the cell should not be used above the limits given below. Exceeding these limits
may also cause mechanical damage to the cell.
• Maximum Angular Velocity: 50 rad/s
• Maximum Sample Viscosity: The geometry should not be forced into the sample. Light hand pressure
should be all that is required.
• Maximum Frequency: 50 Hz (314 rad/s)
NOTE: The quality of data obtained using the pressure cell cannot be expected to match that
obtained when conventional measuring systems are used with the rheometer. Some of the
normal calibration routines are not relevant to, or cannot be used with the Pressure Cell.
Alternative calibration routines are described in this chapter.
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