The KDS270 can hold up to four syringes and can cycle continuously back and forth in a push-pull action.  As two syringes are infusing, two syringes are withdrawing at the same rate.  At the end of the set volume the direction is automatically reversed and the next cycle begins.  With the use of 3-way valves the pump can empty and refill syringes for a continuous dispense.

Features

• Holds four syringes, 10 µl to 60 ml each, With larger syringes the full volume may not be useable. [60 ml syr - 40 ml useable, 30 ml  syr - full]
• Backlit LCD display
• Knob locks/unlocks drive block for effortless, drag-free adjustment
• Simple menu-driven setup:
• select syringe size from displayed table
• dispense volume
• dispense flow rate
• Continuous dispense volume display
• Preset volume control and automatic shut-off
• Settings can be reviewed or changed during operation
• Stall detection
• Choice of unit selection
• Last settings stored in permanent memory
• Built-in RS232C interface for computer "daisy chaining" up to 100 pumps
• TTL interface for foot switch, timer, relay control, outputs for run indicator, valve control.
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Programmable

All 200 series syringe pumps are available as programmable pumps, as well as the KDS 410 syringe pump.  They permit multistep dispenses without the need for computer control.

From the pump keypad, a custom program can be entered which will control the syringe pump from seconds to days; permit the flowrate to be changed for discrete time periods; repeat dispenses control output TTL signals to coordinate with other laboratory instruments (or valves); or respond to inputs from other devices such as switches or relays and to perform loops where dispense sequences are repeated.

The program is divided into time periods called STEPS, each of which can be up to 12 hours long.  Each step is automatically numbered and, to simplify programming, a menu prompts the user to select the options available in each step.

The flowrate can be ramped up or down or kept constant for a defined time period for a volume dispense.  The initial and final flow rate for each period is entered and the pump automatically makes rate changes over the time period.  No need to enter increments for a ramp up or down, the syringe pump automatically ramps the rate linearly.

The syringe pump can be paused and then restarted, either by a time delay or by a TTL input.  Both TTL inputs and outputs can be controlled by the pump.   The syring pump can therefore, respond to switch closures or send out signals to actuate a valve, or other relays, switches etc.

Two separate loops can be programmed so that steps can be repeated.  The number of repeat operations is controlled by the "loop count".  For example, this is helpful when a volume dispense is required repeatedly, triggered by a switch.

The two loops can be "nested" so that the program can run for days and complex dispenses can be repeated many times.

Each step offers these options:

1. Time duration from one second up to 12 hours
2. Travel direction – Infuse or withdraw (where available)
3. Beginning flow rate (µl/hr to ml/min range)
4. End flow rate (µl/hr to ml/min range)
5. Pause – Waits for an external trigger to start
6. Status of output TTL pins
7. Loop option – Loops back to any previous step and repeats the intermediate steps.  Two separate loops are available.
8. Set the count in the loop cycle.  Steps may be repeated up to 100 times.