Large Volume Dispensing

From LEAP

(Difference between revisions)

Revision as of 19:13, 2 April 2009

	Large Volume Dispensing
	Application Type
	SPECIAL
	Application ID

	Description
	Accurate dispensing of solvents at high flow rates

There are three options on the PAL for delivery of large volumes of solvent. Choice will depend on the requirements for delivery rate, delivery volume and accuracy. In each case these pumps can dispense liquid either through PAL side-port syringe, or using the LEAP "Dispense Tool" accessory. The advantage of the latter is that it permits larger flow rates and includes a venting channel to avoid over pressurization in the case of filling sealed vessels.

Common Uses

Dispense liquid prior sample injection and combines the "add liquid" and "inject" steps without user intervention or syringe change.

Typical applications

Dilutions
Derivatisations
Sample spiking
Standard additions

CTC Dilutor Accessory

Syringe pump volume range of 0.25 ml to 2.5ml delivery per 2.5 ml syringe cycle. (Optional dilutor syringe 1ml or 5 ml)
Flow Rate Range: 10μl/min - 300μl/min
Wetted parts: All liquids compatible with borosilicate glass, PTFE, Kel-F, FEP

Notes

Requires the addition of a custom macro or cycle for dispensing/diluting applications
Can be used with any of the PAL side port syringes or with the DISPENSE Tool
Is not supported by the onboard PAL cycles
Requires an open AUX Port on the PAL
Requires PAL firmware 2.3 or higher

CTC Dilutor with DISPTool

CTC Dilutor on PAL

Valco M Series pump Accessory

The patented* Cheminert® M Series liquid handling pump is a syringe-free pump capable of delivering a bidirectional flow to six orders of magnitude. The M Series is a positive displacement pump, which means that it is self-priming and tolerant of any gas which may find its way into the fluid lines. Since there is no separate fill cycle, the pump can be operated continuously, and volumetric capacity is limited only by time.

Notes

Requires LEAP Shell Software for control.
Can be used with any of the PAL side port syringes or with the DISPENSE Tool
Is not supported by the onboard PAL cycles

Vici Valco Pump

Pump on PAL

Useful links:

Valco website - description and specifications of the pump: [1]

Solvent Delivery System (SDS) Accessory

Main Features

4 Solvents can be dispensed
9 Program Steps allow solvents to be added in any order
Software Interface SDS Launchpad for loading dispense routines
Save/Load Methods to PC drive
Easy Verification of Downloaded Method via the “Dashboard” feature in SDS Launchpad
Contact closure triggers device to run stored dispense routine
Significantly extends the PAL dispenseing volume range.
Can be used with any PAL side port syringe or LEAP DISPENSE Tool
Compatible with all PAL Drivers

Solvent Delivery Module

SDS on PAL

Performance Specifications

Maximum flowrate 6mL/min in increments of 0.1mL/min
Flowrate accuracy ± 10%
Maximum dispensed volume 999mL
Volumetric accuracy ± 5%
Maximum pressure 50PSIG
Typical wash time for 2 solvents (1mL each) @ 6mL/min is 45 seconds

Requirements/Limitations

Lower dispense speeds needed for more viscous solvents, e.g., i-Propanol @ 3-4mL/min
Use of Polypropylene compatible solvents

Screenshots

Launch Pad Main Screen

Launch Pad Actions Screen

Launch Pad Load Method Screen

Launch Pad Log Screen

Side Port Syringe Accessory

Main Features

Can be used to dispense liquid prior sample injection
Combines the "add liquid" and "inject" steps without user intervention or syringe change
Variety of sizes available: 20µl or 80µl for LC applications and 20µl or 80µl for GC applications

Side Port Syringe in action

Side Port on PAL

DISPTool Accessory

Main Features

Can be used to dispense bulk liquids without using the injection syringe
The tool is magnetically picked up by the PAL and moved to the vial or plate only when needed
Able to pierce a septa with an adjustable needle penetration
19ga needle with built in vent
May allow single rail to have functionality of dual rail system
Can be used with the Dilutor, Vici Pump, or LEAP SDS

Requirements/Limitations