Instruction Manual

40 Operation
Priming Port Stopcock Options
The threads on the standard priming port stopcock shown in Figure 3-19 can strip if overtightened. To
prevent this, Asymtek offers a tube option that fits directly onto the priming port with no threads. A small
cap is used to plug the tube when not in use. The tube can also be removed and the cap put directly onto
the priming port. This option, shown in Figure 3-31, is used in conjunction with the metal luer priming port,
shown in Figure 3-9.
Figure 3-31 Priming Port Stopcock Option
Gear Ratio
To optimize the flow rate for your application, you can change the gear ratio by physically removing and
replacing or reversing the drive gears within a given gear box for your motor. Two sets of drive gears
have been included with the DP-3000: a set of two 40-teeth gears, giving a 1:1 gear ratio; and a set with
56 and 24 teeth, giving a gear ratio of either 2.33 or 0.429, depending on gear placement. For gear ratio
configuration and corresponding flow rate values, see Table 7-4.
You can change the gear configuration to achieve any of the flow rate values listed in Table 7-4, however
the total number of teeth between the Motor Gear and the Feed Screw Gear must equal 80 teeth.
Motor Gear Teeth + Feed Screw Teeth = 80 Teeth
In general, a smaller Motor Gear results in a lower flow rate, while a larger Motor Gear has the opposite
effect. Figure 3-32 shows an illustration of the gear positions. Additional gears are available in the
upgrade kit. See “Upgrade Kits” in the Introduction section.
PRIME
FULL
LIMIT
STOP
COCK
Figure 3-32 DP-3000 Gear Configuration
Metal Luer Priming
Port
Priming Port
Stopcock Tube
Option
Feed Screw Gear Motor Gear