The JASCO Model AS-2050/2051 autosamplers are fully automatic sample injection systems enabling greater productivity and the highest possible level of precision. Sampling flexibility is unparalleled with up to192 or 768 well positions (two 96-well or 384-well microplates) as an option for laboratory automation and combinatorial chemistry. Also available is a rack for 182 micro-vials or the standard rack for 100 samples with 2 ml vials. The AS-2050/2051 offer 5 operating modes; normal, two methods of pre-column derivatization, dilution, and zero-sample loss injection in stand-alone mode. In the zero-sample loss mode, the sample is sandwiched between two zones of mobile phase solvent, and the entire sample volume is drawn into the loop and injected without loss.

The AS-2050/2051 can be easily combined with the JASCO HPLC system and the JASCO ChromNAV Chromatography Data System. The JASCO ChromNAV Chromatography Data System offers full automation of your JASCO HPLC system including the AS-2050/2051, with features to support laboratories under compliance with 21 CFR Part 11.

Excellent Injection Reproducibility
The AS-2050/2051 offer operation in both fixed loop or variable volume injection modes. The reproducibility achieved in fixed loop 20 μl injection is less than 0.2% RSD with less than 0.01% sample contamination. In variable 10 μl injections RSD was less than 0.3%.

Complete Flexibility
Random sample access is provided as well as random number of injections and random injection volume for each vial. Urgent samples can be given priority.

Temperature control (AS-2051 only)
The AS-2051 offers a built-in Peltier cooling and heating unit to expand the versatility of the instrument and maintain the integrity of all samples.

Non-Adsorbent Tubing
The AS-2050/2051 both use an innovative stainless steel tubing, eliminating the adsorption problem that occurs when analyzing natural samples using Teflon tubing.

Sample Pretreatment Capability
Air segmented sampling enables the AS-2050/2051 to automatically mix up to two different solvents or derivatizing reagents with the sample in a stand-alone mode. By automating the processes of derivatizations, the sample pretreatment capability saves time.

Interfacing with the JASCO HPLC system
The AS-2050/2051 can be used as a stand-alone module through the built-in keypad and LCD display, or integrated into a complete HPLC system with computer control. In stand alone mode, the advanced microprocessor of the AS-2050/2051 offer 10 user friendly programs with 64 steps per program. The AS-2050/2051 can freely interact with other HPLC modules via the built-in LC-Net interface and can also easily be triggered from an external event generated by a computer or other LC modules. Full PC control is also provided when incorporated in a JASCO HPLC system with the JASCO ChromNAV Chromatography Data System.