7-1
Before performing maintenance on the 2700 SELECT, always exit RUN or STANDBY Mode.
While in these modes, the unit periodically calibrates or flushes. Servicing the fluid system in
either RUN or STANDBY Mode can lead to spills or air in the tubing.
To exit RUN Mode, press [RUN] and confirm your intent to exit by pressing [2] for Yes and
then [ENTER]. The Main Menu display will appear.
To exit STANDBY Mode, press [STANDBY] and confirm your intent to exit by pressing [2] for
Yes and then [ENTER]. The Main Menu display will appear.
Main Menu display:
Please select instrument mode
[RUN] [STANDBY] [MENU]
Preventive Maintenance
The YSI 2788 Preventive Maintenance Kit contains all supplies necessary to keep your 2700
SELECT operating properly. Perform the Calibration Pumping System Maintenance detailed in
Section 7.2 at least once every month. Perform the maintenance procedures in Sections 7.3 to
7.11 every 6 months or as necessary. Section 7.9 (Fuse Replacement) is not preventive
maintenance, and obviously requires attention only when fuses fail. Section 7.5 (Probe
Cleaning) is not recommended unless problems related to the enzyme sensor system are
indicated.
Empty the Waste Bottle
If the 2700 SELECT is used for medical research or biological testing, dispose of the waste
bottle contents in a manner suitable for biohazardous waste. The reagents used in the 2700
SELECT are non-toxic and, unless otherwise specified, consist of a phosphate salt buffer with
small amounts of preservatives. YSI 2705 phosphate buffer also contains Potassium Ferricy-
anide. Refer to reagent bottle labels and Material Safety Data Sheets for more information.
Check the Calibrator Bottle
If the fluid level is low or the bottle has been in the instrument longer than 30 days, install a
new bottle of calibrator solution. Follow the instructions in Section 2.3 Reagent Preparation.
After installation, prime the Calibrator Well. From Main Menu, press [MENU]. See menu
information displayed below. Next press [1] for Service, then press [3] for Cal to initiate a 10
second run of the Cal pump. Make certain that all air bubbles are out of the calibrator tubing
when the new calibration solution is pumped to the Calibrator Well. You may need to initiate a
second run to insure the delivery of calibrator solution to the Calibrator Well.
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