Thermo Electron 3940 Series, Руководство по эксплуатации и техническому обслуживанию

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Set the Undertemp
Safety Thermostat
Allow the chamber temperature and humidity to stabilize then set the
overtemp safety thermostat as follows:
1. Turn the overtemp control knob slowly counterclockwise until the
audible alarm sounds and the overtemp indicator lights.
2. Turn the overtemp control knob clockwise at least 2°. The alarm
should be silenced and the overtemp indicator light should go out. The
overtemp safety thermostat is now set a few degrees above the control
temperature setpoint. When the chamber temperature rises to the
overtemp control point, the alarm system will activate, power to the
heaters will shut off, and the chamber temperature will be maintained
at the overtemp control point.
When an overtemp condition occurs, the cause must be determined and
corrected before normal operation under the main temperature controller
can be resumed.
Note
When the chamber temperature control setpoint is changed, the
overtemp safety thermostat must be reset to accommodate the change.
V
Note
The overtemp control is not directly calibrated. The numbers on the
dial are for reference only.
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Allow the chamber temperature and humidity to stabilize, then set the
undertemp safety thermostat as follows:
1. Turn the undertemp control knob slowly clockwise until the audible
alarm sounds and the undertemp indicator lights.
2. Turn the undertemp control knob counterclockwise at least 2° on the
scale. The alarm will silence and the undertemp indicator light go out.
The undertemp safety thermostat is now set a few degrees below the
control temperature setpoint. When the chamber temperature drops to the
undertemp control point, the alarm system activates, power to the
compressor shuts off, and the chamber temperature is maintained at the
undertemp control point.
When an undertemp condition occurs, the cause must be determined and
corrected before normal operation under the main temperature controller
can be resumed.
Model 3940 Series 1-5 Thermo Electron Corporation
Section 1
Installation and Set-Up
Set the Overtemp
Safety Thermostat