AR-G2: Bard

AR-G2: Bard - Short description

The AR-G2 rheometer is a stress-controlled instrument. Due to its fast electronic feedback it can also be used in strain-controlled mode. It is a versatile instrument, suited for a wide range of studies in soft condensed matter. Some of its characteristics are:

Real-time raw data capture.
Easy to use, many geometries to choose from.
Reliable measurements with

Things to remember

Turning on the AR-G2 (must be done in this order)
1. Turn on the Air supply (should be 30 psi)
2. Unlock the draw rod
3. Turn on the Rheometer electronics
4. Turn on the water pump for the Peltier
Turning off the AR-G2 (must be done in this order)
1. Turn off the Rheometer electronics
2. Lock the draw rod finger tight
3. Turn off the water pump for the Peltier

Using the AR-G2 ("Bard")

Get training
Reserve it
If anything unusual happens during use, please ask one of the people responsible for the rheometers. If the main air pressure drops below 70 psi, stop all measurements, do not touch the tools and contact one of the following emergency contacts:
- Harvard facilities office: (617) 495-2840
- Harvard Police (during the night): (617) 495-1212

Measuring Geometries

All available tools can be used on either the "Bard" or the "Druid" AR-G2 rheometers.

Geometry	Dimensions	Sample Volume (approx.)	Notes
Parallel plate 60 mm S#: 987724	60mm Diameter Variable Gap	..	Shear gradient exists across the sample.
Parallel plate 20 mm S#: 987477	20mm Diameter Variable Gap	..	Shear gradient exists across the sample.
Parallel plate 20 mm S#: 987949	20mm Diameter Variable Gap	..	Shear gradient exists across the sample.
Cone/Plate 2° 60 mm S#: 987939	60mm Diameter Cone Angle: 1°, 58', 41'' Gap: 59 microns	..	Constant shear profile.
Cone/Plate 4° 40 mm S#: 987864	40mm Diameter Cone Angle: 3°, 59', 56'' Gap: 109 microns	..	Constant shear profile.
Cone/Plate 1° 40 mm S#: 987620	40mm Diameter Cone Angle: 1°, 0', 26'' Gap: 26 microns	..	Constant shear profile.
Cone/Plate 2° 20 mm S#: 987651	20mm Diameter Cone Angle: 2°, 1', 29'' Gap: 50 microns	..	Constant shear profile.
Couette tool	..	..	..
Double gap Couette tool	..	..	..
Peltier plate (lower tool)		..	Remember to switch on the water bath when using the temperature control.
Upper heated plate		..	Temperature control for upper tools. Minimizes T-gradients across sample. Make sure the air dryer can supply sufficient air flow for this device.