D-Series Syringe Pumps - Isco

D Series Syringe Pumps
Section 8 Continuous Flow Introduction,
Installation, & Operation
8.1 Introduction A D Series continuous flow pumping system consists of two
syringe pumps and a valve accessory package regulated by one
controller. This system allows you to continuously deliver your
liquefied gas or liquid under constant flow or constant pressure
mode.
Continuous flow can be used in either of two modes: continuous
constant pressure or continuous constant flow. Both of these
modes assume positive displacement of the piston, with the
exception of continuous Receive Mode (for detailed information
about Receive Mode, refer to Technical Bulletin TB02, available
on the Teledyne Isco web site).
In any syringe pump continuous flow system there is a flow
irregularity which occurs at the time of switchover from one
pump module to the other. This flow irregularity can be measured
as a pressure fluctuation. Teledyne Isco pressure fluctuation
at switchover is ~0.35 bar (at system backpressures from
6.9 bar to the single pump maximum).
Before programming continuous flow, appropriate valves must be
connected, the pumps must contain fluid, and there must be
backpressure for operation.
The following sections provide part numbers,
specifications, and installation steps for:
Continuous Flow Check Valves, on page 8-2
Continuous Flow Air Valves, on page 8-8
Continuous Flow Electric Valves, on page 8-13
User Supplied Valves, on page 8-16
Following these sections in the manual is information
about:
Operation, on page 8-17
Operating Tips and Guidelines, on page 8-18
Special Features, on page 8-19
Accessories, on page 8-20
8-1