Thermo 3920, Руководство по эксплуатации и техническому обслуживанию

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2.8 Preparing the (Optional) CoBex Recorder
a. Installing the Battery
The seven-day circular chart recorder is located on the
front of the incubator cabinet and is protected by a glass door.
To prepare the recorder for operation, open the glass door
and snap the connector onto the 9-volt battery as shown in
Figure 2-3. If the unit is operating, the green LED lights steady.
If the unit is not turned on, the LED blinks.
Figure 2-3
If the battery is weak or not connected, the green LED will
flash. If power is lost to the cabinet, the LED will also flash.
When replacing the 9-volt battery, use only an alkaline style
battery. Dispose of the old battery following established envi-
ronmental practices.
b. Changing the Chart Paper
1. Press the Change Chart button (#3) and hold it for 1 sec-
ond until the pen begins to move to the left of the chart.
See Figure 2-3.
2. Remove the existing chart by unscrewing the center
knob securing it.
3. Install the new chart, positioning it so that the correct
time line coincides with the time line groove on the
chart plate.
4. Replace the center knob and screw it tightly against the
chart.
c. Changing the Pen
1. Using a small flat blade screwdriver, loosen the 2 screws
holding the pen arm and remove the pen and arm as an
assembly.
2. Unsnap the plastic hinge securing the pen. Remove and
discard the old pen.
3. Install the new pen by snapping the hinge securely
around the pen arm.
4. Re-install the pen assembly by sliding the pen arm under
the screws, positioning the pen tip in the time line
groove. Tighten the screws.
5. Push the Chart Change button (Figure 2-4) and hold it
for 1 second until the pen begins to move back onto the
chart.
Note: Make sure that the pen is marking on the chart. It may
be necessary to gently lift the pen onto the chart paper.
d. Calibrating the Chart Recorder
1. Place an accurate thermometer(s) in the chamber next to
the recorder’s probe(s). After about three minutes, com-
pare the thermometer with the chart recorder. For 2 pen
operations, also compare the second thermometer.
Note: For 2 pen operations, first select the pen you wish to cali-
brate. Hold down the #1 arrow for the red (#1) pen or the #2
arrow for the blue (#2) pen, until the light goes out. Refer to
Figure 2-4. Then adjust as necessary.
If an adjustment is necessary, press
either the #1 or #2 button to move the
pen left or right. The button must be
held about five seconds before the pen
begins to move. Release the button
when the pen matches the thermometer.
Model 3920__________________________________________________________________Installation and Start-Up
2 - 3
1 2
3
time line
groove
Press to
change
chart
Slotted screws
(loosen only)
9-volt battery
Figure 2-4