Advanced Dilution System ADS 2

ADS 2 system control is only available with ICP Expert with the Pro feature pack installed.

The ADS 2 offers automated control of known and unknown dilution needs.

• Reactive dilutions - triggered when signals are overrange to perform an automated dilution of a solution. Create Dilution Lists of required wavelengths and apply them to your worksheet or manually select wavelengths to trigger reactive dilutions
• Fixed dilutions - use when the dilution requirements are known, for example, stock standards needed to create calibration curves or high concentration samples.
• Autodilute standards - specify the dilution values, or a range and number of calibration values, and let ICP Expert determine the dilutions.

Additional information can be found on the following pages:

• See the Autodilutor page for instructions on how to configure software parameters to set up an analysis with Autodilution enabled.
• Install the ADS 2 hardware and run the ADS 2 performance test
• Install and remove the ADS 2 tubing
• ADS 2 maintenance including replacing the valve body, stator and rotor

ADS 2 Flow Diagrams

Solution flows are handled by the autosampler, AVS 6/7, and the ADS 2 to help automate your analysis. This section describes how the solutions are delivered during all phases of an analysis.

The video below describes the solution flow paths for both a non-diluted and diluted sample.

Where:

1. Nebulizer	2. AVS pump	3. AVS 6/7 switching valve	4. AVS sample loop	5. Peristaltic pump on the ICP-OES
6. Autosampler	7. Waste	8. Valve C on the ADS 2	9. Valve A on the ADS 2	10. Valve B on the ADS 2
11. Dilution loop	12. Diluent syringe	13. Carrier syringe

Valve positions

Valve A positions		Valve B positions
Dilute	Bypass	Bypass	Load

Initialization phase

This phase is not shown the video linked above.

Initialization is performed in four steps and runs through the syringe, valve positions and flow paths.

Step 1 - flushes the syringes and cleans the tubing

The ADS 2 Valve A is in the dilute position. Valve B is in the load position. The AVS valve is in the uptake position.

• The carrier and diluent syringes push solution into Valve B, through Valve A and into the AVS 6/7 sample loop and then out to waste.
• The AVS pump pulls rinse solution from the autosampler into Valve B through the dilution loop, through Valve A and then out to waste.
• The peristaltic pump pushes internal standard and rinse solution through the nebulizer.

Step 2 - reload syringes and cleans the tubing

The ADS 2 Valve A is in the bypass position. Valve B is in the load position. The AVS valve is in the uptake position.

• The syringes reload solution.
• The AVS pump continues to pull rinse solution from the autosampler into Valve B through the ADS 2 dilution loop towards the waste.
• The peristaltic pump pushes internal standard and rinse solution into the nebulizer.

Step 3 - prime syringes

Valve A is in the dilute position. Valve B is in the load position. The AVS valve is in the inject position.

• The carrier and diluent syringes push solution into Valve B, through Valve A, through the AVS 6/7 and then out to waste.
• The peristaltic pump pushes rinse solution through the sample loop and into the nebulizer.
• The peristaltic pump also pushes internal standard into the nebulizer.

Step 4 - clean AVS sample loop and nebulizer

Both ADS 2 valves are in the bypass position. The AVS valve is in the inject position.

• The peristaltic pump pushes rinse solution through the sample loop and into the nebulizer.
• The peristaltic pump also pushes internal standard into the nebulizer.

See also:

• Autosampler