Sample Position Using the Depth Gauge
Set the sample position to a repeatable position. Use the sample depth Gauge.

1. Insert the turbine into the top of the sample depth guage.

2. Insert the NMR sample tube into the turbine. Gently push the sample tube down until it touches the moveable bottom of the sample depth Gauge.
3. Loosen the knob on the sample depth Gauge.
4. Raise the bottom of the Gauge, along with the sample tube and turbine, until the sample volume is centered on the centerline mark, between 35 and 51 mm shown on the back of the Gauge.
5. Tighten the knob.
6. Remove the sample tube and turbine from the depth Gauge.
7. Gently pull up on the sample tube in the turbine, replace the turbine/sample tube into the depth Gauge, and gently push down on the sample tube until it touches the repositioned bottom of the depth Gauge.Return to vnmrJ protocol.

Sample Tubes -- To clean the outside of each tube with a solvent such as isopropyl alcohol, followed by a careful wiping with a wiper tissue before placing the tube in the probe. Take care not to touch the white spots and black ring of the spinner (shown in green in the sketch).