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Products - 765 Series of HPLC Pumps  

Alcott
Chromatography
5680 Oakbrook Pkwy
Suite 148
Norcross, GA 30093
1-800-229-5052
770-248-2170
Fax: (770)248-2180
Email: info@alcottchromatography.com

765 HPLC PUMP

Alcott's new Model 765 HPLC pump has been designed to comply with all facets of HPLC, from microbore applications, through preparative solvent deliveries to chemically inert requirements. Key among the design requirements for the Model 765 are reliability and cost effectiveness.

DESCRIPTION

For a fraction of the cost of competing systems, the Model 765 provides much more. This is achieved by making additional capabilities available as standard to the basic system. For example, the 765 comes with a RS232C and 20mA Current Loop interface. These allow the user to control the pump from a central computer or manually on the lab bench. Since it is microcomputer based, the Model 765 allows parameter entry through a set of keys on the front panel. Also, visual feedback is provided via an LED display on the front panel. An additional standard feature is solvent compressibility control to help optimize your chromatography when you change solvents.

Solvent change is accomplished quickly and easily via a purge valve conveniently located on the front panel. Changes from microbore to analytical to preparative operation are attainable by simply exchanging pump heads, which are also located on the front panel.

For buffer applications, a piston rinsing option is available to reduce seal wear and to protect against piston damage. The microbore pump head provides flows from 0.001mL to 1 mL per minute, the analytical pump head allows flows from 0.01mL to 5 mL per minute, and the preparative pump head produces flows from 0.1mL to 20 mL per minute. The Model 765 can sustain pressures up to 8900 psi (60 MPa) with the microbore pump head while preparative operation can go as high as 2200 psi (15 MPa).

The Model 765 HPLC Pump is a serial dual piston pump with only two check valves which provide a minimum rest pulsation. Use of an additional pulse dampener is generally not necessary, even when using a Refractive Index detector. Highly accurate piezoresistive pressure monitoring allows extremely fast control of the pump motor which results in virtually pulse-free flow.

Alcott's new Model 765 HPLC Pump is truly state-of-the-art in LC solvent delivery. This pump is trouble-free and has every feature necessary for universal laboratory operation at a very reasonable price. For more information, contact your Alcott sales representative.

BENEFITS

• Flows from 0.001 mL to 20 mL/min via interchangeable pump heads
• Pressures to 8900 psi (60 MPa)
• Analytical, microbore or preparative applications. PEEK and Titanium materials available
• No pulse dampeners required, even for Refractive Index (RI) detectors
• Microcomputer-based operation and design
• RS-232C and Current Loop ports for computer interface

765 Specifications
Type:	Serial, dual piston pump operation cam controlled with piezoresistive pressure monitoring
Stroke Volume, Analytical Piston Heads:	45 µL for main piston; 14µL for priming piston (analytical)
Total Internal Volume:	100 µL (analytical)
Operation Modes:	Analytical, microbore or preparative flow rates
Control Modes:	Microcomputer-based for local, RS-232C or other Microcomputer, Optional analog control
Solvent Selection:	Manual
Flow Noise Filters:	None required
Priming:	Manual valve on front panel
Readouts:	Pressure, flow, compressibility, upper and lower pressure limits
Maximum Pressure:	7400 psi (50 MPa)(analytical) 8900 psi (60 MPa)(microbore) 2220 psi (15 MPa)(preparative)
Pressure Limits:	Adjustable lower and upper from 0 to 8900 psi (60 MPa)
Pressure Range:	0 to 8900 psi (60 MPa)
Flow Range:	0.01 mL to 5 mL/min (analytical) 0.001mL to 1mL/min (microbore) 0.1mL to 20mL/min (preparative)
Flow Resettability:	0.01 mL/min (analytical) 0.001mL/min (microbore) 0.1mL/min (preparative)
Flow Reproducibility:	<= 0.5% after warm-up
Pressure Resolution Capability of Digital Display:	±15 psi (0.1 MPa)
Weight:	19 lbs. (8.7kg)
Power Input:	90 - 130 V/180 - 250 V, 50/60 Hz VA
Cabinet Size:	10"W x 5.1"H x 15"D (255 x 130 x 381 mm)
Product Part Number
765/00000/00	Model 765 HPLC Pump, Analytical
765/00000/01	Model 765 HPLC Pump, Microbore
765/00000/02	Model 765 HPLC Pump, Preparative

Products - Detectors  

Alcott
Chromatography
5680 Oakbrook Pkwy
Suite 148
Norcross, GA 30093
1-800-229-5052
770-248-2170
Fax: (770)248-2180
Email: info@alcottchromatography.com

795 VARIABLE UV/Vis DETECTOR

DESCRIPTION

Variable wavelength, high sensitivity, and a selection of flow cells make the Model 795 Detector ideal for liquid chromatography applications from microbore to preparative scale.

A direct mechanical drive on the unit뭩 front panel sets the desired wavelength. The standard deuterium lamp covers UV wavelengths; an optional tungsten lamp is available for visible wavelengths. The lamps are prealigned, readily accessible, and can be easily changed.

The Model 795 features 12 switch-selectable absorbance ranges. Low-noise electronics, high-noise rejection filtering, and low-loss optics preserve the detector뭩 high sensitivity and ensure low-noise, low-drift performance.

Flow cells are available to support a full range of applications, from microbore to prep. These cells eliminate dead volume and minimize refractive index contributions. The standard is a 6 mm, 9 µL, Type 316 stainless steel cell for analytical HPLC applications. Kel-F flow cells are available for biocompatible applications; flow cells for microbore and capillary electrophoresis applications are also available. A variable path length (0-3 mm) prep cell can be used to adapt the Model 795 to preparative or largescale separations. The flow cell compartment is located outside the main instrument housing for easy access.

The Model 795 also features autozero and event marking using front and rear panel controls. The unit can be zeroed manually from the front panel or automatically using an event switch connected to the rear panel.

A variety of flow cells and other detector accessories are available for the Model 795.

Maximize sensitivity through continuously variable wavelength optimization
A standard prealigned deuterium lamp and optional tungsten lamp cover the entire UV/Vis spectrum, giving you the ability to work at max.

Convenient front panel controls
A front panel mechanical drive lets you quickly and accurately select and display on the readout any wavelength in the lamp's range. Push-button diagnostics add to the user-friendliness of this detector.

Manual or remote autozero
Rezeroing the baseline is done at the push of a button or through a remote-controlled event for automated systems. Event marks can also be generated either from the front panel button or via remote TTL/contact closure signal.

High sensitivity for your most demanding applications
A 12-position front panel switch allows range settings from 0.0005 to 2.0 AUFS. The second-order Bessel filter, fiber optics, and proprietary circuitry make this the most sensitive detector available.

Flow cells for every application
Flow cells are available in Type 316 stainless steel or chemically inert, biocompatible Kel-F?, for applications from microbore to preparative scale. Superior design gives unmatched versatility and performance.

Easy access and maintenance
Easy access to the flow cell and lamp ensure quick maintenance and minimum down-time.

* Kel-F is a registered trademark of 3M Company

795 Specifications
Range:	UV, 190-380 nm (deuterium lamp) Visible, 366-800 nm (optional tungsten lamp)
Monochromator:	Holographic grating
Bandwidth:	6 nm
Wavelength Accuracy (Mechanical Drive):	±1 nm
Noise:	< ± x 105 AU, typical
Drift:	2 x 105 AU/hr.
Absorbance range:	0.0005 to 2.0 AUFS (12 range settings)
Integrator output:	1 V/AU
Recorder outputs (Full Scale):	10 mV, 100 mV, 1V
Rise times:	0.025, 0.1, 0.3, 1.0, or 3.0 seconds
Dimensions:	9.75" (24.8 cm) W 6.25" (16.6 cm) H 13.25" (33.7 cm) L
Weight:	20 lbs. (9.1 kg)
Power:	100, 110, 220/240 Vac; 50/60 Hz; 125 W
Product Part Number
200346	Model 795 Detector, Bioclean flow cell, 120V
200344	Model 795 Detector, Stainless flow cell, 120V
200345	Model 795 Detector, Stainless flow cell, 220V
Lamps
201305	Replacement Deuterium Lamp (UV)
201306	Tungsten lamp (Vis) with mounting bracket
Flow Cells
201313	Analytical HPLC, 6 mm, 9 µL, SS
201307	Biocompatible, 6 mm, 9 µL, Kel-F?/TD>
201341	High-pressure Microbore, 2 mm, 250 nL, 7000 psi, SS
201308	Capillary electrophoresis (capillary-dependent)

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Products - 708AL Series of HPLC Autosamplers  

Alcott
Chromatography
5680 Oakbrook Pkwy
Suite 148
Norcross, GA 30093
1-800-229-5052
770-248-2170
Fax: (770)248-2180
Email: info@alcottchromatography.com

708AL POSITIVE DISPLACEMENT AUTOSAMPLER

The Alcott Model 708AL Positive Displacement Autosampler is an automatic sampling and fixed volume injection system. The 708AL requires no accessory gases or syringes and, while using Alcotts' patented FilterCap^TM, will automatically filter your sample "In-The-Vial". The 708AL can be equipped with or without an injection valve to allow for optimum configuration for existing or newly designed systems.

OPERATION

The benefits of the Positive Displacement technique are many, including viscosity independence in sample transfer from vial to valve's loop, the highest injection precision possible and simplicity of operation. The technique, as demonstrated below, is such that a uniquely designed cap is pressed into an Alcott Certified^TM 8mm vial which contains sample. Sample is then transferred to the injection valve by the piston action of the hollow autosampler needle which first penetrates the vial cap, then uses the cap to displace the vial's contents.

BENEFITS

• 128 position sample vial tray
• Integrated high speed injection valve
• Selectable needle depth (4 positions)
• "On-the-fly" programming and editing of methods
• System interface through RS-232, IEEE, Contact Closures and BCD connectors
• Automatically filters sample "In-The-Vial"
• Simple to use and maintain
• Thermoelectric refrigeration option controls sample temperature from 4° C to 40° C
• Customized software features available

708AL Specifications
Standard
Design Type:	Fixed loop, XYZ movement, Positive Displacement
Tray Capacities:	128 (8mm) sample vials
Injections Range:	0.06µL to 200µL
Injections Per Vial:	Up to 4 with loop size < 10µL
Precision:	Less than or equal to ±0.3% RSD, ACI test conditions
Carryover:	Less than 0.25% without rinse Less than 0.004% with rinse, under ACI test conditions
Keypad:	20 key, 4 line, 80 character LCD
Valve:	Valco Cheminert C3 valve with 10µL loop and high speed actuator
Programming:	10 Methods, maximum 128 steps per method. Priority sampling
Communications:	Interfaces: RS-232-C, IEEE, I2C Outputs: BCD, parallel printer port, inject market, 4 user selectable NO or NC Contact Closures with user selectable closure duration times.
Dimensions:	33 cm H x 32 cm W x 55 cm D (13" x 13" x 21") Weight: 14 Kg (31 lbs.) Weight: 17 Kg (38 lbs.) Refrigerated
Wetted Materials:	Teflon, 316 stainless steel and nitronic 60
Voltage:	Autoselectable: 100-240 VAC ±10%, 47-63 Hz
Options
Valves:	C2, C4 or CI4W internal loop and C6 external loop Valves available
Refrigeration:	4° C to 40° C within ±1° C accuracy using Peltier cooling of entire tray surface
FilterCaps:	5.0 µm, 0.45 µm and 0.2 µm polypropylene filter membranes available
Materials:	Biocompatible materials available
Other:	Valveless models available for FIA and other direct injection applications
Accessories
AutoChanger 31:	High Throughput vial tray changer that integrates with the Model 708AL autosampler to allow unattended sampling for up to 11 trays.
Column Switcher:	Column compartment designed to hold up to 6 columns. User selectable six position Valco valve can be controlled either manually or via RS-232 connection. Standard and heated versions available
Printer:	Small footprint thermal printer for recording autosampler methods.
Product Part Number
709/00000/01	Standard Model 708AL with Cheminert C3 Valve with Fixed 10ul loop
709/00000/60	Standard Model 708AL without Valve or actuator. This unit will accept the Model 732 Rheodyne actuated valve
709/00000/01R	Refrigerated Model 708AL with C3 Valve with Fixed 10ul loop
709/00000/60R	Refrigerated Model 708AL without Valve or actuator. This unit will accept the Model 732 Rheodyne actuated valve
708/25921/00	Optional UV Cover (recommended to be purchased with autosampler)

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