ESPEC BTL-433, Instruction Manual

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Precautions
1.3. Specimen Protection (Safety Devices)
!
CAUTION
•
Set safety devices according to test conditions and the type of specimens.
Unless properly set, specimens could be damaged if something goes wrong during testing.
The chamber is controlled to a target constant temperature and humidity* by the temperature (&
humidity) controller. Nonetheless, temperature and humidity can get out of control for various
reasons. In such cases, to protect specimens against thermal damage, the chamber has an
independent overheat protector and various other safety devices built into the software of the
controller.
* Humidity is not set with temperature-only chambers.
Table 1.1. Hardware/Software Safety Devices
Safety Device Trip Point Equipment Response
when tripped
Remarks
Overheat Protector
•
Set approximately 20°C higher
than target temperature.
•
Set below specimen’s
maximum allowed temperature.
Absolute
high limit
•
Set approximately 15°C higher
than target temperature.
•
Set below specimen’s
maximum allowed temperature.
•
Max. 160°C.
N/A
Absolute
low limit Set a minimum 5°C lower than
target temperature.
Set above specimen’s minimum
allowed temperature.
•
Alarm Displayed
•
Buzzer sounded
•
Heater shut OFF
•
Humidifier shut OFF
(Temperature-only
chambers excluded)
•
Refrigerator shut OFF
•
Air circulator shut OFF
Temperature
alarms
Upper
deviation
limit Set approximately 10°C higher
than target temperature.
•
Alarm displayed
•
Buzzer sounded *
1
•
Heater shut OFF
Absolute
high limit
•
Set approximately 10% RH
higher than target humidity.
•
Set below specimen’s
maximum allowed humidity.
•
Alarm displayed
•
Buzzer sounded *
1
•
Humidifier shut OFF
Built into temperatu
re & hu
midity co
ntroll
er
Humidity
alarms (Not
included on
temperature-
only
chambers)
Absolute
low limit
•
Set approximately 10% RH
lower than target humidity.
•
Set above specimen’s
minimum allowed humidity.
•
Alarm displayed
•
Buzzer sounded *
1
•
Humidifier shut OFF
•
Refrigeration shut off
When
temperature &
humidity
returns within
range limits,
alarms are
automatically
cleared.
*1 : Can be turned ON/OFF.