50
5. HANDLING PRECAUTIONS
Caution
11. Temperature control.
The temperature sensor for this unit is installed on the inside wall of the chamber and used to
control chamber temperature. Chamber temperature reading, as detected by the sensor, may
not always agree with the temperature of test specimens. More often than not, chamber and
test sample temperatures will differ largely immediately after opening or closing chamber door.
12. Inspect equipment regularly.
The main power switch (ELB) and the Independent Overheat Prevention Device (IOPD), in
particular, are key devices in maintaining DE/DT series unit safety, and must be
inspected/maintained regularly.
See
“Inspection & Maintenance” (P.52) for details.
13. Always set Independent Overheat Prevention Device temperature.
Activation temperature for the Independent Overheat Prevention Device (IOPD) must be set in
order to protect unit from damage, if overheating occurs.
See P.45 for details.
14. Open exhaust damper when processing moistened samples.
When processing moistened samples, open the exhaust damper to increase heat and disperse
moisture. If moisture is allowed to collect and become trapped inside unit, malfunction or electric
shock may result. Excessive moisture inside unit may likewise excelerate HEPA filter
deterioration.
Do not attempt to process dripping wet or liquid samples.
15. Samples/specimens needing special attention.
Use caution when processing samples/specimens, which contain powder or small particles, so
they are not disbursed by sudden movements or abrupt air pressure changes. Allowing
flammable or metallic items to contact the heater assembly may cause a fire or shock hazard.
Be advised that more time may be requred for chamber temperature to rise when processing a
larger amount of samples/specimens or those with a higher heat load capacity. Do not process
more samples than necessary. Further note that temperature reading may not be consistent
when processing heat-generating specimens.
16. Check damper aperture before operation.
Comfirm that damper is at the required aperture before operation. If damper is left fully open,
during high temperature operation, unit may be unable to reach maximum temperature and
maximum clean level may not be reached. Leaving intake fully open may also prevent unit from
reaching maximum temperature.