Chapter 1 Precautions in Usage
10
1.2 Specimen Protection (Safety Devices)
CAUTION
•
Set safety devices according to test conditions and
the type of specimens.
Unless properly set, specimens could be damaged in the event
something goes wrong in testing.
The cabinet is controlled to a user-set target temperature and humidity
by a temperature (and humidity) controller, but temperature and humidity
* can get out of control for various reasons. Therefore, to protect
specimens against thermal and humidity damage, the cabinet comes
with hardware and software protection against overheating.
* The LU is without humidity control.
Table 1.1 Hardware/Software safety devices
Safety device
Trip point
(Set to satisfy below
conditions.)
Equipment response
when tripped
Remarks
Overheat protector
・
Set roughly 20°C higher than
target temperature.
・
Set below specimen's maximum
allowed temperature.
Absolute
high limit
・
Set r15 to +20°C higher
than target temperature.
・
Set below specimen's maximum
allowed temperature.
・
Max. 95°C
Absolute
low limit
Set higher than the cabinet’s
lowest allowed temperature.
LH :
Min.0°C
LHL :
Min.0°C
LHU :
Min.-25°C
LU :
Min.-25°C
・
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
(Not applicable to LU
cabinets)
・
Refrigerator shut
OFF
(Not applicable to LH
cabinets)
・
Air circulator shut
OFF
・
Specimen power
supply control
terminal interrupted
(option)
Temperature
alarms
Upper
deviation
limit
Set roughly 10°C higher than target
temperature.
・
Alarm displayed
・
Buzzer sounded *
1
・
Heater shut OFF
Absolute
high limit
Set at least 10%RH higher than
target humidity.
Set below specimen’s maximum
allowed humidity.
・
Alarm displayed
・
Buzzer sounded *
1
・
Humidifier shut OFF
Build int
o
t
e
m
perat
ure (and hum
idit
y
) cont
roller
Humidity
alarms (Not
included on
LU cabinets)
Absolute
low limit
・
Set at least 10%RH lower than
target humidity.
Set above specimen‘s minimum
allowed humidity.
・
Alarm displayed
・
Buzzer sounded *
1
When
temperature
returns within
range limits,
alarms are
automatically
cleared.
*1 : Can be turned ON/OFF.
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