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3.1
Volume: Dispensing By Volume, Edit
SUMMARY: In the Volume Dispensing mode, the LabTec™ output must be optimized for a particular
pump head / motor / tubing combination. Once optimized and calibrated, the LabTec™ dispenses
user-programmable batch volumes with dependable precision and accuracy.
A simple Re-Cal feature is available on the front panel to fine-tune the calibration, and compensate
for output changes due to peristaltic tube wear. In general, the LabTec™ should be re-calibrated
(Re-Cal key) at least daily, for very high accuracy dispensing applications a more frequent
re-calibration schedule is advisable.
For volumetric batch dispensing, the typical precision and accuracy ranges from 0.5% to 1.0%
depending on the dispensing rate. In general, the higher the dispensing (pump) rate, the poorer
the dispensing precision and accuracy.
Volume units are milliliters by default. To change to liters or microliters (μl), access Setup, Pump;
Volume Units.
DISP. VOLUME: Defines the volume to be dispensed in terms of milliliters. For example, to
dispense 50.00 mL, use the “Incr”, key to scroll to 50.00, then press “Select”. Default = 10.00.
TUBING: Defines the tubing used in the Head. Accesses appropriate factory calibration curve.
Choose between 13, 14, 16, 25, 17, & 18 for thin-walled in a 1081, and 15, 24, & 35 thick walled
when using a 1082.(This option not displayed if RH series head or Mag gear head is chosen) De-
fault = 13.
CLEAR CV: This clears the Cumulative Volume (CV) value without having to cycle the system power,
which also clears this value. Press Yes, No, or Exit.
SNIFFLE: The SNIFFLE function consists of a brief pump reversal to suck back the droplet that
typically hangs at the dispensing tip. The amount reversal is user-selectable from 0 to 2.0
revolutions. The SNIFFLE default value is set at 0.3. The SNIFFLE function allows you to avoid car-
ry-over between dispensing cycles and provides for a cleaner dispensing environment.
Default = 0.3 sec.
SLOW FACTOR: Defines the solution volume that is dispensed slowly at the end of the dispensing
cycle. For example, if the solution volume to be dispensed is 100 mL, then the SLOW FACTOR is
selected to be approximately 10% or 10 mL. When the LabTec™ initiates volumetric dispensing, the
first 90 mL (90% of total) will be dispensed at a high pump rate (e.g.100% of max.), while the last 10
mL (10% of total) will be dispensed slowly to avoid overshooting the solution target volume.
Default = 1.00 mL.
PUMP DIRECTION: Defines the rotation of the pump head; this parameter can be changed from
clock-wise (CW, default) to counter clock-wise (CCW). Default = CW.
PUMP RATE: Defines the relative pump speed (0% to 100% of max.) with which the batch volume is
being dispensed. Typically, this parameter is set at 100% (default), however, a slower pump speed is
advisable if excessive back-splashing occurs. Default = 100%.
TIME DELAY: Defines the time interval between dispensing cycles (0.1 to 60 seconds).
Default Setting: 1.0 sec.
COUNT: Defines the number of repeats of the dispense that occur. For example, when COUNT=10,
then the selected DISP. VOLUME will dispense10 times. Default Setting = 1.
Note: If you requested pre-configured aliquots from Parker, then the
LabTec™ was
delivered to you optimized, calibrated and ready for use.
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