Installing The Chart Paper; Replacing The Pen - Thermo Scientific 3881 Operating And Maintenance Manual

Section 2
Installation and Start-Up

Installing the chart paper

Replacing the pen

Changing recorder range
2-8 7033881 Blood Bank
(Refer to Figure 2-11) Press and hold button #3
for about one second until the pen begins to
move to the left. Unscrew the knob at the center
of the chart and install the paper, positioning the
chart so the correct time line coincides with the
time line groove on the chart plate.
Replace the knob and press the #3 button until
the pen begins to move to the right.
Replacement pens may be ordered from Technical Services department. To
change 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. Install the new pen assembly by sliding the inkless pen arm under the
screws, positioning the pen tip in the time line groove. Tighten the
screws.
3. Push the Chart Change button and hold it for 1 second until the pen
begins to move back onto the chart.
The chart recorder contains eight temperature ranges and is factory-
programmed for the refrigerator. To select another range, press and hold
button #3 until the pen moves off of the chart paper. Press and hold for
five seconds either button #1 or button #2. Release the button and the
green LED will begin to flash. The number of flashes corresponds to the
temperature ranges as shown in the table that follows.
Program No.
Program 1
Program 2
Program 3
Program 4
Program 5
Program 6
Program 7
Program 8
Figure 2-11
Range
-40°C to 30°C
0°C to 60°C
-100°C to 39°C
-5°C to 50°C
0°C to 100°C
-100°C to -200°C
-115°C to 50°C
-10°C to 70°C
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