Instrument Type:

Autosampler

Related Commands:

Wash

Value Range:

Depends on device and installed syringe

Description:

The NeedleUp command enables lifting the sample needle.

Function:

Then the internal sample valve is switched (see the example for a load/inject process in the Autosampler).

When lifting the needle, a running Wash process is automatically interrupted, i.e., the solvent flow is not through the sample loop but directly from the pump onto the column. Use the Load command to perform the same operation without moving the needle up.

 Tip:

Use the Wash and NeedleUp commands to prevent crystallization of substances, such as buffers, by washing the sample loop.