PLI-90A Pico-liter Injector

PLI-90A Pico-liter Injector


  • Femtolitre to microlitre injections
  • Digital display for injection count, time, and pressure
  • Optically encoded circuit for reliable setting of injection time
  • 3 pressures: inject, balance and clear



The PLI-90A picoinjector reliably delivers injections from femtoliters to nanoliters through micropipettes by applying a regulated pressure for a digitally set period of time.

Whether you need to do large injections into capillaries or very small injections into mammalian nuclei, the PLI-90A is up to the task.

Pressure to the pipette is controlled precisely through a multi-turn regulator and is reported digitally for reproducibility. Injection time is set using an optically encoded circuit that permits both fine and coarse settings from a single control knob. System timing can be controlled in three ways: push button, foot switch, or external trigger.

Unique Pressure Capabilities

The PLI-90A features three positive pressures.

These functions allow the user to:

  • Inject – Inject picoliter to nanoliter amounts of fluids
  • Balance – Apply a balance pressure to prevent backflow into the micropipette following an injection
  • Clear – Clear a micropipette of material that is blocking the tip

The PLI-90A’s Balance and Clear functions are features not found on other microinjection units.


    • – In addition to the injection pressure, the PLI-90A offers a secondary balance pressure. This adjustable control applies a positive pressure to the injection pipette both before and after an injection that eliminates dilution caused by capillary action and aids in the prevention of clogging. Wasteful continuous injections that can occur when no separate balance pressure is available is avoided.


    – A high-pressure pulse can be used for clearing a pipette should it happen to clog. This is especially useful when working with pipettes sized for smaller volumes.

Electrical Connectors

BNC type connectors are available at the front panel to ease integrating the PLI with other equipment. Synchronization with or control from injections with a data acquisition system is possible.

Selection Guideline

The PLI-90A is available in two packages: Basic and Plus:

  • The Basic system comes with an input hose, output hose, and input hose adapter.
  • The Plus system comes with everything in the Basic system with the addition of one foot switch and a 130 mm stainless steel pipette holder.


  • All PLI-90A’s require a micromanipulator and support stand, which must be purchased separately.
  • The standard metal pipette holder (PLI-PH1) that comes with the PLI-90A can be replaced by an Acrylic Pipette Holder, which must be purchased separately.
  • For labs lacking bottled gas or pressurized air, the AIR-1 compressor is available.


Input Gas Pressure 75 PSI Recommended, 105 PSI Maximum
Injection Pressure 0.2 to 60 PSI (413 kPa), regulated
Balance Pressure 0.1 to 9.9 PSI (68.9 kPa) regulated, multiturn control, other ranges available on request
Clearing Pressure Input gas pressure, unregulated
Injection Time 0.01 to 99.99 Seconds
Injection Time Accuracy ±0.01% (Crystal Time Base)
Duration Mode Internally timed or externally gated
Time Trigger Front panel, foot switch, or external TTL pulse (BNC)
Pressure Units PSI /kPa switch selectable
Pressure Monitor Output BNC, front panel, 10 mV/PSI or 1 mV/kPa
Pressure Readout Inject, balance, clear, output port
Pressure Display Resolution 3½ Digits, 0.1 PSI or 1 kPa
Injection Count Display 0 to 9999 Injections
Power Input External 9VDC @ 400mA (min) Power Supply universal input 90 to 264 VAC
Weight 5.44 kg (12 lb)
Dimensions (HxWxD) 89 x 432 x 250 mm (H x W x D)
Warranty One year, parts & labor


For information regarding the PLI-90A Pico-Liter Injector please contact us by calling 01707 328347. Our expert team will be more than happy to answer your questions. You can also get in touch via email at

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