M Series liquid handling pump

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.

Two models are offered – the M6 with a flow range of 5 nl/min to 5 ml/min (10 ml/min intermittent), and the M50 with a range of 1 µl/min to 25 ml/min (35 ml/min intermittent).

RS-232 and RS-485 communication protocols are incorporated into the microprocessor-driven controller. (USB interface requires an adapter.) While the standard package includes software and instructions to run the pump as a stand-alone unit, the pump can be used in conjunction with a stream selection valve to enable automated solvent selection.

Two software packages are included: M6-LHS software for everyday lab usage under the control of a PC, and IMS (Intelligent Motions System) software for more advanced control of system parameters. Most users will utilize the M6-LHS software, which features standard liquid handling terminology and an integrated valve control package in a familiar Windows format.

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Applications
Product numbers
Specifications

Operating principle

At the core of the pump is a rotor which houses four pistons. As the microstepper motor turns the rotor, the pistons float on a stationary cam; at any given moment, one piston is filling, one is dispensing, and the other two are in transit between the fill and dispense positions.

Animated views of the M Series (AVI format)

Action of pistons riding on cam (2.1 meg)
Pulseless load/dispense action of pistons (2.6 meg)
(These are large files and will take a considerable time to download over a dialup connection.)

Further reference

Printable brochure (pdf format)
Declaration of CE compliance
Instruction Manual
Decontamination report (must accompany units returning for repair)
Pump failure report (must accompany units returning for repair)

Specifications

	M6	M50
Continuous minimum dispense	5 nl/min	1 µl/min
Continuous maximum dispense	5 ml/min	25 ml/min
Maximum intermittent dispense*	10 ml/min	35 ml/min
Maximum backpressure	100 psi	100 psi
Gravimetric precision	0.1% at 1.25 ml 0.5% at 125 µl	0.1% at 8 ml 0.5% at 800 µl
Pump internal volume (µl)	100 ± 2	625 ± 12

*High speed continuous flow will reduce the pump lifetime.

Product numbers

Description		Product No.
Model M6	Pump, controller, and stepper motor	CP2-4841-100M1
	Pump and stepper motor	CP2-4841-100SM
	Pump only	CP2-4841-100D
	Controller only	CP-CM1-P
	Replacement pump motor	CP-DSM
Model M50	Pump, controller, and stepper motor	CP3-8182-625M2
	Pump and stepper motor	CP3-8182-625SM2
	Pump only	CP3-8182-625D
	Controller only	CP-CM1-P
	Replacement pump motor	CP-DSM2

Applications

The M Series pump is recommended for any liquid handling applications requiring accuracy and precision. It is particularly suited for applications with a wide range of volumes (which entail laborious syringe changes with other pumps) and for applications which benefit from the versatility provided when the pump is coupled with the optional multiposition reagent selection valve. Typical applications include:

• Calibration source for mass spectroscopy
• Flow-based electrochemical systems
• Flow cytometry, cell and drug perfusion
• HTS and robotic systems
• Infusion and micro-dialysis
• LC applications - micro flow, micro gradients
• Mass spectroscopy sample introduction
• Micro diluters/dispensers for nl to ml range applications
• Micro liquid transfers for micro arrays
• Microtiter plate dispensing using multiposition valves
• Post-HPLC column reagent addition, stop flow, peak collection
• Precision dispensers and sampling devices (such as autosamplers)
• Sample introduction systems for ICP nebulizers