Two Pump Operation - Teledyne D series Installation And Operation Manual

To fill pump B with
modifier
To fill pump A with
supercritical fluid (helium
head-space tank)

6.1.3 Two Pump Operation

5. Open the inlet valves of each pump.
6. Run both pumps empty.
7. Zero the pressure on each pump.
8. Reconnect the pump A inlet tubing to the inlet valve.
1. Place the pumps in independent control - constant pres-
sure mode, as previously explained. Be sure the pumps are
stopped.
2. Close the pump B outlet valve and open the pump B inlet
valve.
3. Press REFILL. Press softkey B to designate that pump B is
the active pump (the pump being refilled). Pump B will fill
with modifier.
4. After pump B has filled, press run and deliver 5-10 ml of
modifier back through the inlet valve, to ensure all air is
purged from the pump, before pressing stop.
5. Close the inlet valve.
Note
When using the pumps with liquefied CO
in a "dip-tube" CO
chase CO
2
1. Place the pumps in independent control - constant pres-
sure mode, as detailed above.
2. Be sure the pumps are stopped.
3. Close the pump A outlet valve before opening the tank sup-
ply valve and pump A inlet valve.
4. Press REFILL. Press softkey A to designate that pump A is
the active pump (the pump being refilled). Pump A will fill
with pressurized fluid.
5. After pump A has refilled, wait 15 seconds before closing
the tank supply valve and pump A inlet valve.
Pump A delivers supercritical fluid while pump B meters mod-
ifier. Both fluids pass through one-way check valves before they
meet and are blended together in a mixing tee. Modifier concen-
trations of up to 100 percent (v/v) are programmable via the con-
troller. If higher concentrations are needed, put the modifier in
pump A to be delivered as the primary fluid.
Both pumps operate in constant pressure mode and will flow up
to their maximum rate to maintain the set pressure. When mod-
ifier addition mode is selected and RUN is pressed, pump A
pressure is ramped at its maximum flow rate to the set pressure
while pump B waits at a lower pressure (3.5 bar).
Pump B minimum pressure can be increased if the modifier boils
at room temperature and 3.5 bar.
D Series Syringe Pumps
Section 6 Modifier Addition
, make sure you pur-
2
tank.
2
6-5