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LPD Series Variable Volume Precision Dispense Pump

This stepper motor-driven positive displacement pump provides exceptional reliability and performance at an economical price. With its highly reliable reciprocating drive train, this maintenance-free pump allows you to aspirate an accurate volume of fluid and dispense that fluid volume out in smaller, highly precise increments, in many cases acting as a replacement for syringe pumps. Standard models are available with full dispense volumes of 50, 250, 1000, and 3000 µL, and with ¼-28 ports in either a PEEK or PMMA (acrylic) port head. Each pump is equipped with a home sensor to establish the end of stroke position. Some models also contain an optical encoder which provides feedback on motor movement. Every pump is 100% functionally tested to guarantee performance and customization options are available. The pump is field-proven in many in vitro diagnostic applications, including reagent dispensing, aliquoting , and sample preparation.

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Key Product Facts
  • Full Dispense Volumes:50, 250, 1000, & 3000 µL
  • Highly Precise:CV ≤0.01% (certain models)
  • Extensive Cycle Life:10 million cycles minimum
  • Home Sensor Included on Every Pump
  • Encoder & Integrated Backlash Compensation Optional

Product Information

General Specifications
Characteristic Specification
Max Dispense Speed1 2000 Full Steps per Second
Self Priming Pumps Operate Across a Wide Pressure Range
Max Discharge Pressure2 60 psig (Most Models)
95 psig (3000 µL Model Only)
Cycle Life 3 10 M Cycles Min
Operating Temperature 40°F to 150°F (4°C to 66°C)
Storage Conditions 4 Temperature: -40°F to 175°F (-40°C to 80°C)
Relative Humidity: 85% Max, Non-Condensing
1Operating the pumps at higher speeds may affect dispense accuracy and life expectancy. The pumps may be operated in full-step, half-step, or micro-step mode, depending on the electrical drive design and application parameters. Refer to the individual pump's inspection drawing for additional specifications such as harmonic frequency, etc.
2Varies by pump model. Refer to the part number table for individual pump specifications.
3Typical cycle life on water. Cycle life is dependent on system conditions and may vary by application.
4Pumps should be stored completely wet or completely dried with nitrogen before prolonged periods of inactivity.
Wetted Materials
Component Material
Port Head PMMA or PEEK
Piston TZP
Seal UHMWPE (All Models)
UHMWPE & 316 Stainless Steel (3000 µL Models Only)
Electrical Operation
  • Pumps are equipped with a NEMA 17 bipolar stepper motor
  • Home sensors provide a 5 V end of stroke indication; the sensor output will remain low (0 VDC) when the piston is fully extended.
  • Rotary encoders are two-channel, quadrature (no index pulse) designs.
Velocity Profiles
50 µL model. The pump’s piston reciprocates back and forth to draw fluid into the pump and then dispense it out. An example of the 50 μL LPD pump's flow rate and motor step rate are depicted above. This plot demonstrates a complete aspirate and dispense cycle utilizing the pump’s maximum recommended speed and acceleration. A 30 ms valve delay is included before and after each piston movement to switch flow paths as the pump's piston changes direction. This profile showcases just one application of the pump; it can also aspirate and dispense in finer increments and at varying speeds, depending on your application parameters.
Cross Section Views
Standard Performance Model: Molded Port Head
Dimensional Views
Standard Performance Model
This image is for reference only. All dimensions are in inches [millimeters].
Mounting & Fluidic Connections
Fluidic Connections: Port Head Pump Configurations
The standard port head contains two threaded ¼-28 flat bottom ports used to connect the system to the pump. Customized port heads are available upon request and may include alternative materials, valves mounted directly to the port head, or different fluidic ports.

Get Started

The Lee Company’s Variable Volume Pump Driver is driven by the powerful Trinamic TMC5130 motion controller and motor driver, along with two Trinamic MAX22200 solenoid drivers. This comprehensive setup empowers the driver to effortlessly manage every aspect of the pumping system, from the precise control of the bipolar stepper motor, home sensor, and encoder to the management of two solenoid valves. The driver is optimal for expediting benchtop testing of Lee pumps and valves. The I2C and UART comms options also allow the driver to be integrated into end systems, streamlining system development. Crafting custom scripts and subroutines is a breeze with the TMCL IDE, allowing users to easily upload code to the driver for standalone operation. Moreover, the driver can function as a peripheral device, seamlessly receiving direct motion commands from another controller. For newcomers, a library of starter scripts is readily available to assist with simple pumping routines. Additionally, for those seeking advanced control options, a detailed firmware manual is available to get optimal performance for your application. Contact a Lee Sales Engineer for more information.

Part Numbers & Specifications

This table below contains the part numbers and technical specifications for this product. If you have specific questions, need a quote, or would like to request a handbook or drawing, click the red request button in the column on the far right.

Part Numbers & Specifications
Filter Part Numbers
PERFORMANCE
MODEL
FULL DISPENSE
VOLUME
(µL)
PORT HEAD
MATERIAL
PART NUMBER
PERFORMANCE
MODEL
FULL DISPENSE
VOLUME
(µL)
FULL STEP DISPENSE
RESOLUTION
( µL / STEP ) 		MAX SPEED
(FULL STEPS
PER SECOND) 		PRECISION: CV
10% TOTAL
DISPENSE VOLUME 		PRECISION: CV
100% TOTAL
DISPENSE VOLUME 		DISPENSE ACCURACY
AT 100%
DISPENSE VOLUME
PORT HEAD
MATERIAL
HOME SENSOR ENCODER INTEGRATED
BACKLASH
COMPENSATION 		CONFIGURATION Request Information
LPDA2720150L STANDARD 50 0.04 2000 ≤0.4% ≤0.04% ±0.6% PMMA Yes - - A Request
LPDA2750150L STANDARD 50 0.04 2000 ≤0.4% ≤0.04% ±0.6% PEEK Yes - - B Request
LPDA2720125D STANDARD 250 0.2 2000 ≤0.4% ≤0.04% ±0.6% PMMA Yes - - A Request
LPDA2750125D STANDARD 250 0.2 2000 ≤0.4% ≤0.04% ±0.6% PEEK Yes - - B Request
LPDA2750110H STANDARD 1000 0.5 2000 ≤0.4% ≤0.04% ±0.6% PEEK Yes - - B Request
LPDA2750130H STANDARD 3000 1 2000 ≤0.4% ≤0.04% ±0.6% PEEK Yes - - B Request
LPDA1720350L HIGH 50 0.04 2000 ≤0.4% ≤0.04% ±0.5% PMMA Yes Yes Yes C Request
LPDA1750350L HIGH 50 0.04 2000 ≤0.4% ≤0.04% ±0.5% PEEK Yes Yes Yes D Request
LPDA1720325D HIGH 250 0.2 2000 ≤0.1% ≤0.01% ±0.5% PMMA Yes Yes Yes C Request
LPDA1750325D HIGH 250 0.2 2000 ≤0.1% ≤0.01% ±0.5% PEEK Yes Yes Yes D Request
LPDA1750310H HIGH 1000 0.5 2000 ≤0.1% ≤0.01% ±0.5% PEEK Yes Yes Yes D Request
LPDA1750330H HIGH 3000 1 2000 ≤0.4% ≤0.04% ±0.6% PEEK Yes Yes - D Request
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The Lee Company has developed the Lohm Laws for defining and measuring resistance to fluid flow. The Lohm is defined such that 1 Lohm will flow 100 GPM of water with a pressure drop of 25 psi at a temperature of 80°F.

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