Used Waters liquid chromatography instrument

Used Waters liquid chromatography instrumentFeatures:

The laboratory needs to maintain continuous operation 24 hours a day, 7 days a week, so there are higher requirements for the durability and reliability of the instruments. Due to rising costs, laboratory managers have been searching for a way to reduce maintenance time and increase operational efficiency. It is increasingly important for instruments and software to maintain uninterrupted daily operation while providing the highest quality results. In order to meet these requirements, Waters made significant design innovations on top of the original 2690, 2690D, and 2790 separation modules (the core of the Alliance system), introducing many new technologies that were not yet implemented when they were released in 1996, thus creating a new generation of superior instruments.

Used Waters liquid chromatography instrumentTechnical Specifications
System Attachment - Ability to Expand Alliance System
The excellent performance of Waters Alliance HPLC and LC-MS systems makes them the best performing HPLC and LC-MS instruments. The 2695 separation unit is the foundation of the Alliance system (including solvent management and sample management), combined with other system components to form a complete system. With the development of software and hardware technology, the application areas of the entire system have been greatly expanded. We provide a variety of instrument options and accessories to match the growing application range.

Alliance series column temperature box (heating/cooling) and Alliance series column temperature box (heating)

Changes in room temperature can affect the reproducibility of HPLC results, whether it is between repeated runs of a single system, between different systems within a laboratory, or between different laboratories, all of which may lead to unstable results. Column temperature changes can cause retention time drift, peak shape changes, and increase the difficulty of obtaining precise results. Waters offers two types of column temperature chambers (both of which are relatively advanced microprocessor control methods), heating/cooling type and heating type. The temperature range for heating/cooling type is 4 ℃ to 65 ℃, while the temperature control range for heating type is 5 ℃ to 65 ℃ above room temperature. Both types of column incubators can accommodate a 30 centimeter chromatography column (including an online protection column). Fix the chromatography column with a clamp that can be freely positioned on the slide rail. Improved connecting pipelines and leakage trays enhance their functionality and safety. Space is reserved at the bottom of the column temperature box for the switching valve.

Sample room temperature control module
This module is mainly used for thermally unstable samples to improve the stability of the sample solution by stabilizing the temperature. The use of Peltier effect devices greatly reduces module size and provides constant and precise temperature control, with a temperature control range of 4 ℃ to 40 ℃. This module can be directly integrated into the reserved position in 2695.

*Second hand Waters 2695 liquid chromatographSwitching valve options

Provide 3 different automatic switching valves (easy to install design, just connect 2 cables and tighten 2 screws). Each valve component includes piping and tools for you to connect to chromatography columns or other external devices. The switching valve can be programmed and controlled through the instrument panel, or it can be powered by Empower ™ Or MassLynx ™ Implement software control. Two types of Alliance series switching valves can automatically switch up to 3 or 6 chromatography columns. Can be used for multi method sequence switching or automatic method development (for Waters AMDS system). Another type of 2-position switching valve can be used for offline regeneration of 2 chromatography columns with alternating switching (requiring some additional equipment), which can cleverly increase sample flux.

Binary Coded Decimal (BCD) Module

The BCD module can perform a foolproof sample information tracking by reading the BCD code on the sample bottle, providing sample information for non Waters chromatographic data systems. The BCD module includes a power supply, 2695 separation module connection cable, 25 pin cable interface, and clamp. The 25 pin interface is used for communication between the BCD module and the data system.

Integrated built-in 4-channel solvent vacuum degassing machine

The 4-way solvent high-performance deaerator component is used to remove air dissolved in the HPLC mobile phase. This component can be installed on the tray where the gradient proportional valve is located, and the installation process is very easy. Degassing machine can improve the performance of solvent delivery system and enhance the reliability of the entire system. The fully automatic cleaning system of the active plunger rod sealing ring cleaning device can select the appropriate solvent according to the mobile phase, forcibly clean other solvents or crystallized salts on the sealing gasket on the high-pressure side of the pump piston chamber, and also lubricate the plunger rod, which can greatly increase the service life of the sealing ring under buffer liquid mobile phase conditions.

Post column derivative system

It consists of a post column derivative module, a temperature control module, and two derivative reagent pumps. The online derivatization reaction is completed using an optimized two-stage post column derivatization reactor, which integrates an independent reaction tube and a counter current heat exchanger technology. This can minimize the effect of spectral band broadening outside the column and improve the sensitivity of the instrument.

Waters 2695Technical parameters of liquid chromatography:
Solvent Management System: Linear Dual Piston Drive Device with Independent Control,Dual pressure sensors
feedback loop,No pulsation,No need for mixers and dampers
Number of solvents:4
flow rate range：0.010～10.000ml/min,with0.001ml/minfor increment
Flow velocity accuracy：0.075% RSD
Accuracy of flow velocity：±1.0%
Delay volume：<650μL, independent of backpressure
Operating pressure：0～5000psi
Mixed range：0.0～100%with0.1%increment
Gradient accuracy：± 0.5%Not changing with backpressure
Gradient accuracy：±0.15%Not changing with backpressure
Compression compensation: Automatic,continuous
Gradient curveMultiple gradient curves:linear,step,Convex and Concave LinesWaters996Diode array detector
Resolution:1.2nm
Noise:±1.5×10-5AU
Waters2996Diode array detector
with512A photodiode
The optical resolution of each diode is1.2nm
The operable wavelength range is190to800nm