Programming - Teledyne D series Installation And Operation Manual

D Series Syringe Pumps
Section 6 Modifier Addition

6.2 Programming

6-6
Once pump A has reached the set pressure, the controller will
enter a hold mode and wait for a pressure drop. The start of
EQUILIBRATION is signaled by opening the extractor inlet, or
pressing RUN.
Note
Flow must then be started through the system by opening all
valves! The modifier pump will not equilibrate properly without
flow.
Pump B pressure is then slowly ramped upward until its check
valve is detected as open. At this point, the controller exits
EQUILIBRATION mode and displays the message RUNNING.
When RUNNING is displayed, the controller monitors pump A
piston movement, and calculates the pump B piston movement
required to deliver the correct ratio of modifier. If pump A cannot
maintain the set pressure, as when the extraction cartridges are
initially filling or pump A is refilling, the controller reverts to
EQUILIBRATION and pump B pressure is dropped below that of
pump A to avoid delivery of incorrect modifier concentrations.
Once the pump A set pressure is reestablished, the system will
re-equilibrate.
When pump B needs refilling, it must first be placed under inde-
pendent control, as you must run it to return 5-10 ml of modifier
back through the valve to be sure that the cylinder is free of air.
Note
To properly equilibrate the pumps, they must be delivering
fluid.
When preparing your system for modifier operation, if you are
connecting pump A to a CO
stainless steel tubing (P/N 60-1243-391) and appropriate CO
connecting fittings. If you do not have these fittings, a CO
inder connection package (P/N 68-1247-043) may be ordered from
Teledyne Isco.
Once the pressure has been zeroed and the pumps are filled, you
are ready to set up your modifier addition parameters. You will
need to place the pumps in modifier mode, set the pressure limits
(under the limits option on the main menu) and designate the
percent of modifier (found under % pump on the run screen) to be
added. If your modifier boils at 3.5 bar at room temperature, you
may want to increase the minimum pressure for pump B to
prevent vapor (the default minimum pressure is 3.5 bar).
Before operation in modifier mode, zero and fill the pumps under
independent control/constant pressure mode.
Once the pumps are ready, place them in modifier mode:
Press > (A) >
MENU MORE
(5).
MODIFIER
tank, you will need to use the
2
- (4), and select
MULTI PUMP
2
cyl-
2
CONTIN