24
ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in the table below, and also self diagnostic functions.
Alarms and safety functions
Alarm & Safety
Situation
Indication
Buzzer
Safety operation
Upper limit
temperature alarm
If the chamber temperature exceeds
the upper limit alarm temperature set
value.
Over heat lamp lights.
E12 or E16 and chamber
temperature are displayed
alternately.
Continuous tone
Heater OFF
Remote alarm
Automatic set
temperature alarm
If the chamber temperature deviates
from the set temperature by ±1.0
o
C or
more.
All digits on the digital
temperature indicator blink.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay
Automatic set CO
2
density alarm
If the chamber CO
2
density deviates
from the set value by ±1.0 % or more.
All digits on the digital CO
2
density indicator blink.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Normal display mode.
-----
The setting mode is
canceled.
Key lock
When the key lock is “ON”.
-----
-----
The setting is disabled.
Automatic calibration
function
Normally, the zero point of the CO
2
sensor is calibrated every 4 hours (or
very 10 minutes for the first hour after
switch ON), using the atmosphere as
the gas to be calibrated.
The decimal point (period)
on the digital CO
2
density
indicator blinks.
----- -----
CO
2
gas cylinder
empty
If the CO
2
density does not increase
when the gas valve is opened.
E01 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
Remote alarm
Gas line changeover
When the gas supply line is switched.
(only when MCO-80GC is installed)
E01 is displayed alternately
with the temperature on the
digital temperature
indicator.
Gas supply line indicator
blinks.
Intermittent tone
Gas supply line is
altered.
Remote alarm
Chamber
temperature sensor
abnormality
If the temperature sensor is
disconnected.
E05 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
Heater OFF
Remote alarm
If the temperature sensor is short
circuited.
E06 is displayed alternately
with the temperature on the
digital temperature
indicator.
Sensor box
temperature sensor
abnormality
If the sensor box temperature sensor is
disconnected.
E07 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
CO
2
valve close.
Remote alarm
If the sensor box temperature sensor is
short circuited.
E08 is displayed alternately
with the temperature on the
digital temperature
indicator.
Ambient temperature
sensor abnormality
If the ambient temperature sensor is
disconnected.
E09 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
Remote alarm
If the ambient temperature sensor is
short circuited.
E10 is displayed alternately
with the temperature on the
digital temperature
indicator.
CO
2
sensor
abnormality
If the output voltage of the CO
2
sensor
is abnormal.
E11 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
CO
2
valve close.
Remote alarm
Main heater
abnormality
If the upper limit alarm temperature
alarm operates, or if the main heater or
the main heater relay is open circuit.
E12 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
Remote alarm
Bottom heater
abnormality
If the bottom heater or the bottom heater
relay goes open circuit.
E13 is displayed alternately
with the temperature on the
digital temperature
indicator.
Intermittent tone
Remote alarm
