2-25
8
$ 9 .
You were previously instructed to prime the fluid system. Since then, you have been learning
about the menu selections. Now it is time to check the probe baseline current to determine if the
installed enzyme membrane sensor(s) and probe(s) have equilibrated and are stable enough to
initiate calibration.
From the previous instructions your instrument should be displaying Main Menu.
Please select instrument mode
[RUN] [STANDBY] [MENU]
If your instrument display shows another message, press [MENU] on the keypad. The
instrument should display the message above. If you inadvertently entered the Run Mode or
Standby Mode, you will need to exit to return to the Main Menu. See instructions in Section 5.1
regarding entering and exiting these modes.
Press [MENU] to display instrument function options.
Select instrument function
1-Service 2-Setup 3-Diagnostic
Press [3] for Diagnostic.
Select diagnostic
1-Motor 2-Pump 3-Probe 4-I/O 5-Sensor
Press [3] for Probe.
B:LAC 4.23 nA
W:DEX 3.10 nA
1-Flush 2-Calibrator 3-Sample
Observe the probe current values. If they are above 6 nA (nA = nanoamp), check to see if they
are decreasing in value. Check the Sample Chamber; it should be full of buffer. If necessary,
press [1] for Flush. The Buffer Pump will turn on and flush buffer through the Sample
Chamber. Watch the baseline nA values to see if they are decreasing during the flush.
NOTE: Other options in this mode (2-Calibrator and 3-Sample) are used to observe the probe
current after injection of calibrator and sample solutions, respectively. You should not need to
use these probe diagnostics at this point.
Once the baseline currents are below 6 nA and reasonably stable, press [MENU] to return to
Main Menu. You may need to allow an hour or more to establish stability when initially setting
up the 2700 SELECT.
Please select instrument mode
[RUN] [STANDBY] [MENU]
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