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Under optimal conditions the enzyme 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.
Temperature Compensation
12.7
The sensitivity of the sensors, in the 2900 Series, varies with temperature changes. The sample module contains a
temperature probe that monitors the fluid temperature. The sample results are temperature corrected for the difference in
temperature between the sample and the calibration.
Level Sensing
12.8
The 2900 Series employs level sensing on the Sipper and, optionally, in the waste, calibrator and buffer bottles.
The Sipper level sensor detects the sample surface and then travels into the sample about 3 millimeters (1/8 inch). This
controlled immersion depth permits the use of sample tubes/plates that are filled to different heights without significant
carry-over between samples.
The Sipper and Arm Assembly should never be touched while the unit is in operation.
The calibrator and supply bottles are monitored for low levels and the waste bottle is monitored for high level.
13. Warranty and Repair
YSI 2900 Series Biochemistry Analyzers are warranted for one year from date of purchase by the end user against
defects in materials and workmanship, exclusive of batteries. Within the warranty period, YSI will repair or replace, at its
sole discretion, free of charge, any product that YSI determines to be covered by this warranty.
Limitation of Warranty
13.1
This Warranty does not apply to any YSI product damage or failure caused by
(i) failure to install, operate or use the product in accordance with YSI’s written instructions,
(ii) abuse or misuse of the product,
(iii) failure to maintain the product in accordance with YSI’s written instructions or standard industry procedure,
(iv) any improper repairs to the product,
(v) use by you of defective or improper components or parts in servicing or repairing the product, or
(vi) modification of the product in any way not expressly authorized by YSI.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. YSI’s LIABILITY UNDER THIS
WARRANTY IS LIMITED TO REPAIR OR REPLACEMENT OF THE PRODUCT, AND THIS SHALL BE YOUR SOLE
AND EXCLUSIVE REMEDY FOR ANY DEFECTIVE PRODUCT COVERED BY THIS WARRANTY. IN NO EVENT
SHALL YSI BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING
FROM ANY DEFECTIVE PRODUCT COVERED BY THIS WARRANTY.
To exercise this warranty, write or call your local YSI representative, or contact YSI Customer Service in Yellow Springs,
Ohio. Send the product and proof of purchase, transportation prepaid, to the Authorized Service Center selected by YSI.
Repair or replacement will be made and the product returned, transportation prepaid. Repaired or replaced products are
warranted for the balance of the original warranty period, or at least 90 days from date of repair or replacement.
13.1.1 Shipping Instructions
1. Clean and decontaminate items to insure the safety of the handler.
2. Complete and include the Cleaning Certificate.
3. Place the product in a plastic bag to keep out dirt and packing material.
