6-6
Under optimal conditions the sensor response depends on diffusion limitation of the substrate.
When the substrate can diffuse at a greater rate than the enzyme can turnover product, enzyme
kinetics defines the response and nonlinearity is a symptom. This occurs as an enzyme
membrane ages.
It is necessary to periodically check sensor linearity. YSI offers linearity standards for all of the
recommended calibration values. See Section 1.4 for details. If you chose to identify your own
calibration value and measurement range, keep this failure mode in mind.
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The sensitivity of the sensors, in the 2700 SELECT, varies with temperature changes. The
temperature probe in the sample chamber monitors the fluid temperature very near to the
enzyme sensor. The sample results are temperature corrected for the difference in temperature
between the sample and the calibration.
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The 2700 SELECT employs capacitive level sensing on the Sipper and in the calibrator, waste
and supply bottles.
The Sipper level sensor detects the sample surface at the Test Tube Sample station and then
travels into the sample about 3 millimeters (1/8 inch). This controlled immersion depth permits
the use of sample tubes that are filled to different heights without significant carry-over
between samples. This same technique can be employed when using the optional 2710
Turntable (See the YSI 2710 Turntable Operation Manual).
The Sipper and Arm Assembly should never be touched while the unit is in operation. As an
extra safety precaution, the Sipper detects contact with a conductive body, such as a hand. If a
conductive body is detected, the Sipper immediately stops, waits for several seconds and then
returns to the Sample Chamber.
The calibrator and supply bottles are monitored for low levels and the waste bottle is monitored
for high level. The capacitive method depends on close proximity between the bottles and the
metal chassis of the 2700 SELECT. The bottles should always rest on the metal floor inside of
the instrument. It is also very important that the level sensor cables do not contact the metal
chassis.
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