Thermo Electron 3940 Series, Operating And Maintenance Manual

Page: 15 / 78

Change the Chart Paper
Note
When the chamber temperature control setpoint is changed, the
undertemp safety thermostat must be reset to accommodate the change.
V
Note
The undertemp control is not directly calibrated. The numbers on
the dial are for reference only.
V
The seven-day circular chart recorder is located on the front of the
incubator cabinet and is protected by a glass door.
To prepare the recorder for
operation, open the glass door and
snap the connector onto the 9V
battery (Figure 1-4). If the unit is
operating, the green LED lights
steady. If the unit is not turned on,
the LED blinks.
If the battery is weak or not
connected, the green LED will flash.
If power is lost to the cabinet, the
LED will also flash. When replacing
the 9V battery, use only an alkaline
style battery. Dispose of the old
battery following established
environmental practices.
1. Press the Change Chart button (#3) and hold it for 1 second until the
pen begins to move to the left of the chart. See Figure 1-4.
2. Remove the existing chart by unscrewing the center knob securing it.
3. Install the new chart, positioning it so that the correct time line
coincides with the time line groove on the chart plate.
4. Replace the center knob and screw it tightly against the chart.
1-6 Model 3940 Series Thermo Electron Corporation
Section 1
Installation and Set-Up
Set Undertemp Safety
Thermostat (cont’d)
Figure 1-4. Install Battery In Recorder
Cobex Recorder
(Optional)