WHEATON
®
OmniSpense
®
ELITE Peristaltic Pump
WHEATON | 800.225.1437 (U.S. & Canada Only) | 856.825.1100 |
www.wheaton.com
| P/N 50099067 Rev. 5/15/12 WMAN_001
23
The contents of a
RECALL
register can be previewed by pressing the
?
(info) key and pressing
OK
when
done.
15.0 Tips on Maintaining Maximum Accuracy
Several operating variables must be considered in obtaining maximum dispense accuracy, such as tubing
sizes, pump speed, and applied ramping. In addition other variables such as tubing characteristics
(material, age, chemical compatibility) and pumped – medium characteristics (viscosity, chemical
makeup, temperature) must also be considered in obtaining best dispensing results.
15.1 Proper Tubing Selection
Each different tubing size will provide a different liquid delivery range when used in conjunction with the
pump unit. Accuracy is increased as the number of pump head revolutions required per dispense is
increased. Tubing size should be selected so the pump head makes at least 3 complete revolutions, with
ramp rates at zero (see section 7.6). Additional revolutions are necessary for accurate results if ramp
rates are employed.
15.2 Selection of Ramp Rates
Proper selection of ramping rates must be carefully considered when calibrating and operating. Maximum
accuracy is obtained when the effects of pump head and liquid inertia are minimized during pump startup
and braking. The following examples show two scenarios:
Example A:
Shows the pump in proper operation, with ramping applied and rates properly set. The pump
ramps up to running speed, continues at the set running speed, then stops at the end of the dispense.
RECALL SCREEN
Previewing Memory
Register #1