The milliGAT™ is a new generation pump for precision fluid handling which will pump bi-directionally both liquids and gases, or a combination of both. It features a combination of performance capabilities unmatched by any other commercial pump. In particular, its remarkable flow range of over six orders of magnitude, from nL/min to mL/min, and its capability to precisely meter volumes as small as nanoliters, make it suitable for many different fields of application, including microfluidics, HTS, dispensing, titrating, FIA, SIA, Zone Fluidics, diluting, and many others. It maintains high precision across the range of flow rates and metered volumes. The user can sequence between nanoliters and milliliters with simple pump commands.

Global FIA has two models of the milliGAT pump with different flow ranges. The MG-LF has a flow range of 6 nL/min - 6 mL/min, and the MG-HF has a flow range of 60 nL/min - 50 mL/min. Specifications for the two models are give below.

The milliGAT™ is an excellent replacement for syringe pumps - it provides better performance and eliminates the need for refill cycles and syringe changes.

The milliGAT™ is stepper motor driven and fully computer controllable. A micro-processor driven controller controls flow rate, flow direction, metered volumes, ramp rates, automatic backlash correction, and other control parameters using serial commands via RS-232 or RS 485 communication protocols.

The milliGAT™ was patented by Global FIA, and is manufactured by VICI Valco, a company well known for its precision analytical valves.

While the standard package includes software and instructions to run the milliGAT as a stand-alone unit, the pump can also be combined with other fluid handling devices such as multi-position selection valves with control from a single serial port.

Features of the MilliGAT™ include:

Operating Principle

At the core of the pump are four reciprocating 1/8" pistons housed in sapphire chambers. The pistons are located in a rotor. As the 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 fill and dispense ports. The transition between each piston is engineered to yield pulseless flow.

Applications

• FIA, SIA, Zone Fluidics
• Sample introduction systems for ICP nebulizers
• Calibration source for mass spectroscopy
• Flow-based electroanalytical 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
• Mass spectroscopy source cleaning
• Micro diluters/dispensers for nL to mL range applications
• Micro liquid transfers (nL) 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)

Product Specifications

Physical Specifications	milliGAT LF	milliGAT HF
Dimensions (mm)	Given below
Weight pump	520g
Weight motor and gear assy.	530g
Weight micro-electric controller	300g
Weight power supply	300g
Internal volume	100 µL per pump revolution	630 µL per pump revolution
Resolution MSEL=256	243,200 pulses / 100µL	486,400 pulses / 630µL
Pump volume range	10 nL - 109 L or continuous flow	100 nL - 109 L or continuous flow
Pump flow rate range	0.0001 - 167 µL/sec (6 nL/min - 10 mL/min)	0.001 - 800 µL/sec (60 nL/min - 50 mL/min)
Back pressure	100 psi	100 psi
Volume precision (C.O.V.)	<0.04% at 1.25 mL <0.3% at 125 µL	<0.1% at 1.25 mL <0.6% at 125 µL
Fittings	10-32 female thread with Valco detail	¼-28 female thread
Fluid contact	PTFE, Sapphire, Valcon-E3, Valcon P, and Viton,	PTFE, ZrO2, Valcon H2
Power Requirement
Rest current draw	0 mA	0 mA
Operational current draw	1200 mA (Typ.) (peak 1600 mA)	1200 mA (Typ.) (peak 1600 mA)
Voltage	12-48 VDC, 24 VDC (Typ.)	12-48 VDC, 24 VDC (Typ.)
Motor
Type	2 Phase Bipolar (1.8º per step)	2 Phase Bipolar (1.8º per step)
Gear Assembly
Type	Planetary	Planetary
Ratio	1:4.75	1:9.5
Backlash	1.5 µL (Typ.)	10 µL (Typ.)
Communications
Type	COM1 RS-232 COM2 RS-485 (RS-422)	COM1 RS-232 COM2 RS-485 (RS-422)
Baud rate	9600 (default), 4800 - 38,400 bps	9600 (default), 4800 - 38,400 bps
Parity	None	None
Data bits per character	8	8
Stop bits	1	1
Error checking	None	None
Mode	ASCII	ASCII
Environmental
Operating Temperature	0 - 50°C	0 - 50°C
Operating Humidity	< 90% non-condensing	< 90% non-condensing
Storage Temperature	-20°C - 70°C	-20°C - 70°C