Parker SciLog LabTec - Dispensing by Weight: How to Get Started

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5.1 Dispensing By Weight: How to Get Started
If a data printout is desired, connect the cable (P/N: 080-096) between the LabTec™ “Printer” port
and the Parker printer (P/N; 080-095). In the LabTec
®
Setup: Printer submenu, make sure all the
printer communications parameters have been entered. Turn on the printer, in the
LabTec™ select
the Weight mode, then press “Exec” key; the first line to be printed will consist of
weight dispensing
parameters.
Install the pump tubing: For most weight dispensing applications, #24 thick-walled silicone pump
tubing is recommended (requires a 1082 peristaltic pump). Use approximately six (6) feet of #24 tub-
ing; install the tubing such that two (2) feet of tubing are located on the discharge side while four (4)
feet of tubing are located on the suction side of the .
(The lengths here are only guidelines.)
If you use a 201 Magnetic Gear Pump Head, #24 Silicone pump tubing is also recommended. However
in this case, pipe adapters (¼ x
1
/ ¨, male, P/N: 400-500) are installed at the inlet and outlet ports of
the 201 magnetic gear pump head. The #24 silicone tubing slips tightly over the inlet and outlet pipe
adapters.
The scale should be located next to the LabTec™. On the discharge side, fasten the pump tubing to
a ring stand (P/N: 400-420) using nylon ties. The dispensing tip should be secured with a clamp and
located above the scale with sufficient clearing to allow the easy removal of any sample bags or
containers. On the suction side of the LabTec™, secure the pump tubing to the solution reservoir.
Press the “Prime” key at the LabTec™ front panel until all of the tubing is filled with solution.
Consult Weight Dispensing Mode: Edit for editing your weight dispensing parameters.
DISP. WEIGHT: Defines the dispensed weight in terms of grams. For example, to dispense 25.00
grams, use the “Incr,” key to scroll to 25.00, then press “Select”.
SNIFFLE: The sniffle function consists of a brief pump reversal at the end of the dispensing cycle to
suck in the droplet that typically hangs at the end of the dispensing tip. Select SNIFFLE = 0.0.
SLOW FACTOR: Defines the diluent weight that is dispensed slowly at the end of the dispensing cycle.
For example, if the diluent weight is expected to be 100 grams, then the SLOW FACTOR is selected to
be approximately 25% or 25.00 grams.
PUMP DIRECTION: Defines the rotation of the pump head, this parameter can be changed from
clock-wise (CW) to counter clock-wise (CCW).
PUMP RATE: Defines the relative pup speed (0% to 100%) with which the diluent is being dispensed.
S e l e c t P U M P R A T E = 8 0 %.
TIME DELAY: Defines the time interval, in seconds, between dispensing cycles.
COUNT: Defines how often the dispensing cycle will be repeated. For example, when COUNT = 10,
then the selected DISP. WEIGHT will be dispensed 10 times.
Note: This arrangement allows used pump tube sections located in the to be replaced with new
tube section located at the suction side of the pump. When advancing pump tubing in this man-
ner, the used pump tube sections end up on the pump discharge side.