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Section 5
Factory Installed Options
Installing the Chart Paper
Change Recorder
Temperature Range
Recorder Calibration
5-8
Model 900 Series
1. Open the plastic door of the recorder and press button #3 until the
pen begins to move outward.
2. Unscrew the knob at the center of the chart and remove the paper.
3. Install the new chart paper, position the paper to the correct time line
and replace the knob.
4. Remove the cap from the felt pen and press button #3.
The chart recorder contains eight factory
programmed temperature ranges. To change the
recorder range:
1. Press and hold button #3 for one second,
then let the pen move off the chart paper.
2. Press and hold for five seconds either button
#1 or button #2.
3. Release button and the green LED begins to
flash. Count the number of flashes to
determine the present program setting.
4. To change the program setting, press the left or right arrows to increase
or decrease the count.
5. When the desired program number is flashing, press button #3 to
bring the pen arm back onto the chart. Recording will begin in the
new program.
Note The recorder must be in service for 24 hours before performing the
following calibration procedure.
1. Place an accurate thermometer in the chamber next to the recorder
probe. Temperature probes for the recorder are located in the left front
corner of the freezer chamber (Figure 1-4).
2. After about three minutes, compare the thermometer reading with the
chart recorder reading.
3. If an adjustment is necessary, press the #1 button to move the pen to
the left or the #2 to move the pen to the right. The button must be
held about five seconds before the pen begins to move. Release the
button when the pen position matches the thermometer.
Note The felt-tip pen on the recorder requires periodic replacement. The
ink will appear to fade before replacement becomes necessary. Additional
pen tips may be purchased from Thermo.
Program From
1
2
3
4
5
6
7
8
▲
▲
To
-40
30°C
0
60°C
-100
38°C
-5
50°C
0
100°C
-100
200°C
-115
50°C
-10
70°C
Thermo Scientific
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