YSI 2700 SELECT, User Manual

Page: 42 / 165

3-3
Once a stable calibration is established, the following display will appear:
Ready to sample at Station #2
You are now ready to run a sample.
You may present a sample at any one of several stations: Station #2 (Test Tube Holder Station),
Station #3 (Manual Station), Station #4 (with optional 2710 Turntable), or Station #5 (with
optional 2730 Monitor and Control Accessory). When the “Ready to sample....” screen first
appears, the sample station entered at the Run Mode Setup menu is selected. However, you may
temporarily assign sampling to an alternate station; simply press the number key corresponding
to the number of the station you want to sample from. For example, press the '3' key to change
the prompt from the previous display to ”Ready to sample at Station #3”. The 2700 will
sample from the alternate station until you re-assign sampling or leave the “Ready to
sample....” screen.
Note that if an alternate sampling station is selected when you leave the “Ready to sample....”
screen, the alternate setting will be lost, and the station # stored at the Run Mode Setup menu
will automatically be selected the next time you return. To permanently assign sampling to a
different station, you must enter the Run Mode Setup menu and store a new station # in
memory.
Operation at the Test Tube Holder Station (#2)
The Test Tube Holder (See Figure 3.2) accepts tubes from 9 to 16 millimeters in diameter and
50 to 100 millimeters long. Any container other than a tube with the dimensions indicated
should be presented at the Manual Station (Station #3). Some double-wall plastic tubes may
prevent the fluid detection from working properly. These tubes should also be presented at the
Manual Station.
For the purposes of demonstrating basic operation, choose the high level standard for the
chemistry you are set up to run. For example, if you have installed a YSI 2365 (glucose
oxidase) membrane, calibrate with YSI 2776 standard and use YSI 1531 standard (containing
9.00 g/L dextrose) to run as a sample.
Using the appropriate standard from your starter supplies, fill a test tube about half full. The
Test Tube Holder is hinged at the bottom. Pull out the top as shown in Figure 3.3. Place the tube
in the holder. The Sipper is not designed to pierce septa, but can be used with some flexible
evaporator covers that are preslit. Alternatively, you may use a smaller container and sample
from the Manual Station (#3) to conserve linearity standard solution.
Push the holder back into place. The Test Tube Holder Sensor, located above the holder, detects
the presence of a tube. If a tube is detected, the Sipper will sample from this station; if no tube
is present, it will move to the Manual Station (Station #3). Press [SAMPLE]. The 2700
SELECT will do the rest. The Sipper moves to the sample test tube and immerses itself about 3
millimeters (1/8 inch) below the surface of the fluid.