18 | Chart Recorders (Optional)
Thermo Fisher Scientific ULT Freezers
Chart Recorders (Optional)
Panel-mounted six-inch seven-day recorders are available as
options for all freezer models except for the smaller 300 box
capacity models.
Set Up and Operation
To prepare the recorder to function properly, complete the
following steps:
1. Open the grille door to access the recorder.
2. Install clean chart paper (refer to
).
3. Remove the plastic cap from the pen stylus or ink pen
and close the recorder door.
Recorder operation begins when the system is powered on.
The recorder may not respond until the system reaches
temperatures within the recorder’s range.
Figure 6. Chart Recorder
Figure 7. Chart Buttons
Changing Chart Paper
To change the chart paper, complete the following steps:
1. Locate the pressure sensitive buttons at the front, upper
left of the recorder panel.
2. Press and hold the Change Chart button (#3) for one
second. The pen will move off the scale.
3. Unscrew the center nut, remove the old chart paper, and
install new chart paper. Carefully align the day and time
with the reference mark (a small groove on the left side of
the recorder panel).
4. Replace the center nut and hand tighten. Press the
Change Chart button again to resume temperature
recording.
Calibration Adjustment
This recorder has been accurately calibrated at the factory
and retains calibration even during power interruptions. If
required, however, adjustments can be made as follows:
1. Run the unit continuously at the control set point
temperature. Continue steady operation for at least two
hours to provide adequate time for recorder response.
2. Measure cabinet center temperature with a calibrated
temperature monitor.
3. Compare the recorder temperature to the measured
cabinet temperature. If necessary, adjust recorder by
pressing the left (#1) and right (#2) chart buttons.
Note:
The stylus does not begin to move until the top center
button (#3) is held for five seconds.
CAUTION:
Do not use sharp or pointed objects
to depress the chart buttons. This may cause
permanent damage to the recorder.
