2-3
The Buffer Pump draws buffer from its bottle, pumps it through the Sipper Pump body and the
Sipper, and flushes the Sample Chamber.
The Calibrator Pump draws the appropriate standard solution from the Calibrator Bottle and
fills the Calibrator Well in the Sample Chamber.
The Sipper Pump retracts its piston to draw in standard from the Calibrator Well or sample
from a tube or container. It extends its piston to dispense standard or sample into the Sample
Chamber.
The Sipper Arm and Sipper Assembly is raised or lowered by one motor, and moved
horizontally to its various positions by another motor. The positions are: Calibrator Well
(Station #1), Sample Chamber ("home"), Test Tube Holder Station (Station #2), Manual Station
(Station #3), Turntable Station (Station #4) and Monitor Station (Station #5). The Sipper
capacitively senses fluid to control immersion depth and detect errors.
The Stir Bar is a plastic encapsulated magnet. It is activated by a motor housed below the
Sample Chamber. It provides thorough mixing inside the chamber.
The Buffer, Waste and Calibrator Bottles are visible through the front door window for easy
monitoring of fluid levels. A stainless steel shaft projecting into each bottle terminates with a
connector on the lid, providing a signal used to halt operations when the Buffer or Calibrator
Bottles are empty, or when the Waste bottle is full.
The Sample Chamber is made of clear acrylic plastic. White and black holders for the sensor
probes are screwed to either side. The immobilized enzyme membranes on the sensor probes
are mounted on O-rings which act as fluid seals on each side of the Sample Chamber. A
reference or auxiliary electrode is housed in the temperature probe and positioned at the back of
the Sample Chamber. It is held in place by a retainer that threads directly into the Sample
Block. A small black O-ring slips over the temperature probe/electrode to provide the seal. The
Calibrator Well is located behind and to the right of the Sample Chamber entry port.
The Test Tube Holder pivots out to allow insertion or removal of several common size test
tubes.
The Display is a 2 line by 40 character liquid crystal display.
The Printer provides a hard copy record of sample results, calibration currents and errors. It
uses 2 1/4 inch (56 mm) wide thermal paper.
The Keypad is a 20 key membrane switch. It has 0-9 numeric keys, SPACE and BACK keys
and 8 function keys.
The Reset Switch is located on the back of the instrument. It is used to hard reset the operating
system.
The Remote Communication Port is an RS-232 serial port. It is used to interface with host
computers or other laboratory instruments.
The Auxiliary Port is an interface connector for use with accessories like the YSI 2710
Turntable.
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