Recorder Calibration - Thermo Scientific Fisher Scientific 900 Series Operating And Maintenance Manual

Section 5
Factory Installed Options
Change Recorder
Temperature Range

Recorder Calibration

5-8 Model 900 Series
The chart recorder contains eight temperature ranges and is factory-
programmed for the freezer. 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 the button and the green LED will begin 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.
2. Temperature probes for the recorder are located in the left front corner
of the freezer chamber (Figure 1-4).
3. After about three minutes, compare the thermometer reading with the
chart recorder reading.
4. 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.
Usually the ink will appear to fade before replacement becomes necessary.
Additional pen tips may be purchased from Thermo.
Program From
1 -40
2 0
3 -100
4 -5
5 0
6 -100
7 -115
8 -10
▲
▲
Thermo Fisher Scientific
To
30°C
60°C
38°C
50°C
100°C
200°C
50°C
70°C