Description
The TriStar 3000 provides high-quality surface area and
porosimetry measurements on solid materials by using the technique of gas
adsorption. This easy-to-operate, tabletop instrument is designed to analyze
up to three samples simultaneously for optimum throughput. Its speed and
accuracy make it an ideal instrument for research and quality control
applications, as well as for industries that include pharmaceuticals, cosmetics,
paints, pigments, food products, and high-tech ceramics.
For applications that fall under FDA’s 21CFR11 rule, the TriStars confirm
TM software option provides the security features and audit trails required by this
regulation.
Features
- Three analysis ports, up to three samples can be run simultaneously
- A 2.75-liter nitrogen dewar that allows for an extended overnight analysis
- Performs three BET surface area measurements in approximately 20 minutes
- Measures surface areas as low as 0.01 m2/g
- Incremental or fixed dosing routines can be used to specify up to 1000
data points, allowing minute details of the isotherm to be observed
- Saturation pressure can be entered, measured continuously, or measured at
selected time intervals
- Free space (void volume in the sample tube) can be measured, calculated,
or entered
- Windows software
Analysis Technique
The TriStar 3000 Analyzer uses physical adsorption
and capillary condensation principles to obtain information about the surface
area and porosity of a solid material. The analytical technique is simple: a
sample contained in an evacuated sample tube is cooled (typically) to cryogenic
temperature, then is exposed to analysis gas at a series of precisely controlled
pressures. With each incremental pressure increase, the number of gas molecules
adsorbed on the surface increases. The equilibrated pressure (P) is compared to
the saturation pressure (Po) and their relative pressure ratio (P/Po) is
recorded along with the quantity of gas adsorbed by the sample at each
equilibrated pressure.
As adsorption proceeds, the thickness of the adsorbed film increases. Any
micropores in the surface are filled first, then the free surface becomes
completely covered, and finally the larger pores are filled by capillary
condensation. The process may continue to the point of bulk condensation of the
analysis gas. Then, the desorption process may begin in which pressure
systematically is reduced resulting in liberation of the adsorbed molecules. As
with the adsorption process, the changing quantity of gas on the solid surface
at each decreasing equilibrium pressure is quantified. These two sets of data
describe the adsorption and desorption isotherms. Analysis of the shape of the
isotherms yields information about the surface and internal pore characteristics
of the material.
Specification
| Pressure
Measurement: |
Range: 0 to 999 mmHg
Resolution: within 0.05 mmHg
Accuracy Within 0.5%
Linearity: Within 0.25 mmHg best fit on line
(transducer manufacturer's specifications) |
| Environment: |
Temperature: 10 to 35° C
operating; 0 to 50° C, nonoperating
Humidity: 20 to 80% relative, noncondensing |
| Manifold
Temperature: |
Accuracy: ±0.25° C
Resolution: Within 0.1° C |
| Vacuum
System: |
Vacuum Pump: One required;
20µmHg (minimum) (May be purchased from Micromeritics or supplied by
the customer) |
| Electrical: |
Voltage: 100,115,200,230
VAC
Frequency: 50/60Hz
Power: 150 VA (maximum) |
| Physical: |
Height: 76 cm (30 in.)
Width: 64 cm (25)
Depth: 53 cm (21 in.)
Weight: 45 kg (100 lb.) |
| Computer
Hardware: |
Minimum Requirements
486DX/66 processor, 8 megabytes of main memory, 20 megabytes of free
disk space, 800 x 600 display capability |
| Miscellaneous: |
ISO 9001 manufacturer
CE certified |
|
