Thermo Electron 3940 Series, Руководство по эксплуатации и техническому обслуживанию

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2-2 Model 3940 Series Thermo Electron Corporation
Section 2
Start-Up and Operation
Control Panel
(continued)
Defrost Switch and Indicator Light (Figure 2-3)
The defrost switch controls power to the defrost system. Setting the
defrost switch to Auto will provide two 15-minute defrost cycles during
a twenty-four hour period. The defrost indicator lights when the defrost
switch is on and the incubator is in a defrost cycle.
Caution
The defrost switch must be set to Auto when the temperature
setpoint is 10°C, or below.
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Humidity Switch and Indicator (Figure 2-3)
The humidity switch controls the power to the humidification system
circuit. The humidity indicator light will cycle as the controller toggles
between humidify and dehumidify.
Dehumidify Switch and Indicator (Figure 2-3)
The dehumidify switch is used with the optional heatless dryer P/N
1900139 to provide dehumidification. The heatless dryer injects dry air
into the incubator chamber as needed, to maintain humidity levels.
When controlling humidity, the dehumidification switch should be in
the ON position for most applications. The dehumidification light will
cycle on and off as the humidity controller toggles between humidify
and dehumidify.
Heat Indicator (Figure 2-4)
The Heat Indicator illuminates when the heater activates.
Cool Indicator (Figure 2-4)
The Cool Indicator illuminates when the refrigeration system activates.
Overtemp Safety Control, Indicator Light, and Audible Alarm (Figure 2-4)
The overtemp safety thermostat should be set slightly above the operat-
ing temperature of the incubator. In the event of an overtemp condition,
the overtemp safety thermostat:
• Activates the audible alarm and the overtemp indicator light.
• Interrupts power to the heaters and maintain the incubator’s cabinet
temperature at the overtemp safety control point.
Note
The overtemp control is not directly calibrated. The numbers on the
dial are for reference only.
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If an overtemp condition occurs, the alarm can only be silenced by raising
the overtemp safety thermostat setting. However, the cause of the problem
must be determined and corrected before normal operation under the
main temperature controller is resumed.