Thermo Electron BBD 6220 - Temperature Protection Device; Control and Display Panel Functions

Temperature protection device (temperature limit controller)
A temperature protection device is built into the unit and acts as a temperature limit
controller. It conforms to Thermal Safety Class 3.1 to DIN 12880 Part 1/11.78.
In a functional state, the temperature limit controller assumes the control function if the
set temperature is exceeded.
The red indicator lamp (1) "Fault" lights up as soon as the temperature limit controller
responds.
Fig. 6: Temperature
limit controller (6)
The cutout temperature of the temperature limit controller can be adjusted in the range
+20°C to +55°C using a coin or screwdriver.
Have your temperature protection device tested for proper operation at reasonable inter-
vals. This applies in particular before prolonged work processes.
Operational test:
Condition: Nominal temperature (controller) reached/constant.
To run this test, turn the dial on the Temperature Limit Controller so that it shows approx.
+5°C less than the temperature indicated on the temperature controller.
If the Temperature Limit Controller responds and the red indicator lamp (1) "Fault" comes
on, the Temperature Limit Controller is operating properly.
Now set the Temperature Limit Controller to the required value depending on the max. cutout
temperature.
If the Temperature Limit Controller is set to the upper temperature limit, it assumes the
function of unit protection (protection of unit and surroundings).
If the Temperature Limit Controller is set to approx. +2°C above the nominal temperature
set at the temperature controller, it assumes the function of load protection (protection of
unit, its environment and loaded material).
The load protection function is only effective above room temperature.
If "Fault" is displayed during operation:
Check the settings on the Temperature Limit Controller and the controller, and correct them
if necessary. If the fault cannot be rectified, contact our service department.
Control and display panel (A)
Microprocessor-controlled controller with digital temperature, CO
2
, O
2
(optional) and relative hu-
midity displays.
The controller has the following functions:
Temperature "set, display and control"
CO
2
concentration "set, display and control"
O
2
concentration "set, display and control" (OPTIONAL)
Relative humidity "set, display and control"
Error code "scan"
auto-start function "activate"
Switching functions
- Acoustic alarm "switch ON/OFF"
- Humidification "switch ON/OFF"
- Manual calibration of CO
2
measuring system "execute"
- Setpoint lock-in "select ON/OFF
- Door heater "switch ON/OFF"
6. OPERATE
18/43 50 079 041