Maintenance; Precaution In Use - Techne SBS-2 Manual Del Operador

MaIntenanCe

This unit is designed for continuous operation and requires little maintenance.
The level of the medium must be maintained and periodically, the bath should be emptied and the
medium screened (or even replaced).
Check the air filter to ensure that clean, dry air is used.
Periodically check the following components for damage and malfunctioning:
porous plate- Check for cracks or local deterioration of the surface, or for leakage of air around the
peripheral seal.
heaters- Check for bad "scaling", pin holes or signs of local deterioration. Check that the elements do
not touch each other at any point, or touch the bath well.
energy regulator- When switched on electrically, the contacts can be heard to "click" on and off
periodically (except when set at the 10 position).
Fail Safe Switch – When the bed is not fluidized, all the heater circuits are automatically broken.
With the bed just "fluidized" the heater circuits should be completed. (Both tests should be made with
energy regulator at 10). Status of the heaters is monitored by the neons on the front panel.
Heater Switch – On the SBS-4 model with the energy regulator set on 10, one neon
should be on in the medium position, two neons for high position.

preCautIOn In uSe

The unit should be placed on a firm insulated level surface to prevent tipping over.
Objects should be slowly immersed into the bath. They should not be dropped into the bath. This will
result in damage to the heaters and there is also the possibility of shock hazard.
Care should be exercised in handling mercury-in-bulb thermometers if they are used either for calibration
or monitoring the temperature.
Air to the fluidized bath should be clean and free from traces of oil. Neglecting this warning will result
in clogged porous plates and heaters will be damaged due to overheating.
The inherent advantages of a fluidized bath, such as no fumes or smell, no vapors and low temperature
environment a few inches above the top of the bath , may give a false sense of security. It should be
noted that the fluidizing media is at elevated temperatures and proper warning should be posted to
prevent any injury to operating personnel.
When the bath has been running at high temperatures (200 °C or more) and the unit has to be turned
off, only the power should be turned off. Fluidization should be maintained until the bath cools down
to 200 °C or below. This will prevent premature failure of the heaters and damage to porous plate.
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