KD Scientific 410 - Manual (Page 21)

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KDS Model 410 Series Syringe Pumps KDS Model 410 Series Syringe Pumps
Programmable Option– General Information
KEYPAD PROGRAMMABLE PUMPS
The "program mode " permits multistep dispenses without the need for computer control.
From the pump keypad, a custom program can be entered, which will control the pump from
seconds to days; permit the flowrate to be changed for discrete time periods; repeat dispens-
es; 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 flowrate 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 pump automatically ramps the rate linearly.
The 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 pump can therefore, respond to
switch closures or send out signals to actuate 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.