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Alarm and security functions
1. Alarm function
The alarm functions incorporated in this unit include automatic al. a rm functions other than ov e r high and
over low temperature settings described in 2.2 (page 12).
variation in the chamber exceeds 2.5
operation, in which case it will operate as shown in figure at right.
2. Security function
Not only is there an alarm to signify that the chamber temperature is abnormal, but there is also a security
system to prevent such a situation from occurring.
security functions.
ii
Alarm and security function
Alarm & Security
Automatic alarm and
security temp. setting
High limit temp.
Low limit temp.
Thermal fuse
Thermal sensor is
short circuited
Disconnection of
thermal sensor
Memory back-up
Dip switch alteration
Key lock switch
A uto PV
°
C from that set. This function operates even during programmed
:so· co ,-- --�
'"
High limit
L
temperature
_ _ \ __ __ __ _
0
37'C
- / _ _ _ _ __ _ ___
E
Low limit temperature
°
C
C)
DisP!ay
Condition
Chamber temp.
Alarm LED flashed
c
0
variation exceeds
LED flashes
°
2.5
C
Alarm LED lit
When chamber temp.
exceeds high limit
temp.
When chamber temp.
Alarm LED lit
exceeds low limit
temp.
When chamber temp.
°
exc€!eds 70
C
When display temp.
Alarm LED flashed
0 c LED flashes
°
Exceeds 65
C
When display temp.
Alarm LED flashed
0 c LED flashes
°
Exceeds -25
C
Alarm LED flashed
Memory is erased
(when the power
OFF flashes
sour�e
is turned
off
for
more than 6 hours)
-----
Power failure, power
Source is cut by
mistake
source
4-digit LED display
When power
is
flashes
Temporarily cut and
dip switch setting is
changed
----·
Turn key lock switch
ON
---·-
ln SV mode and when
any key is not
pressed for more than
aporox. 1 min.
This function operates when the temperature
The table below shows a summary of the alarm and
,
'
- ----- - -,
' '
'
,
'
u(: --------------·
�----------------------
Time (hour)
Buzzer
Intermittent buzzer
with 5 minutes delay
Continuous buzzer
Con�inuous buzzer
-----
-----
Intermittent buzzer
Intermittent buzzer
Intermittent buzzer
-----
-----
----
- --·-
24
Remote alarm contact
Security operation
Operates with 5
High temp.; heat f: r off
minutes delay
Low temp.;
comoressor off
Operates
Heater, receptacle,
fluoi- e scent lamp off
Operates
Compressor
-----
Fusing; heater, fan
motor off
Operates
Heater, fluorescent
lamp,
receptacle, fan
motor and compressor
off
Operates
Heater, fluorescent
lamp, receptacle, fan
motor and compressor
off
Operates
All off except controller
-----
Protect stored
contents and continue
operation after
restorino
-----
Protect stored
contents and continue
operation with new dip
switch mode after
restoration
-----
Stop receiving key
input
-----
Automatically restore
to present value
display mode from
setting mode
off
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