Chart Recorders; Set Up And Operation; Changing Chart Paper; Calibration Adjustment - Thermo Scientific PLUS Series Installation And Operation Manual

Thermo Scientific Revco

12 Chart Recorders

Panel-mounted six-inch seven-day recorders are available as
options for all freezer models.

12.1 Set Up and Operation

To prepare the recorder to function properly, complete the
following steps:
1. Open the recorder door to access the recorder.
2. Install clean chart paper (refer to Section 12.2 below).
3. Remove the plastic cap from the pen stylus 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.
Chart
Figure 3. Chart Recorder
Upright Freezers
PLUS
Chart Buttons
Imprinting
Stylus
Reference
Mark
Hub-Nut and
Retaining Wire
Figure 4. Chart Buttons
CAUTION! Do not use sharp or pointed objects to
depress the chart buttons. This may cause permanent
damage to the recorder.

12.2 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.

12.3 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 setpoint 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.
The stylus does not begin to move until the button is held
Note:
for five seconds.
Installation and Operation
CHANGE CHART
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