Thermo Scientific 7400 Series, Operating And Maintenance Manual

Page: 34 / 60

7007400 Cryoplus 3-11 Thermo Scientific
Section 3
Troubleshooting the Alarms
The
liquid
nitr
ogen
lev
el
is
one
inch
or
mor
e
abo
ve
the
high
lev
el
set
point.
The
remote
contacts
set
to
activ
ate
in
30
minutes.
The
alarm
system
resets
if
the
alarm
condition
corr
ects.
P
rinter
prints
E
rr
or
15.
The
liquid
nitr
ogen
lev
el
is
one
inch
or
mor
e
abo
ve
the
high
lev
el
set
point.
M
ov
e
the
high
lev
el
set-point
to
the
curr
ent
LN
lev
el.
(The
setpoint
can
be
changed
back
after
the
LN
has
ev
aporated
to
the
desir
ed
lev
el.)
2
2
15
alarm6a.cdr
Front
Panel
Alarm
Alarm
Description
and
Probable
Cause
System
Response
Printer
Error
Code
Corrective
Action
The
Alarm
can
only
be
silenced
with
the
key
switch
in
the
Programming
Access
position.
Return
the
key
switch
to
the
Lock
position
after
silence.
Alarms
do
not
ring
back
except
where
noted.
green green
flashing
orange red
red
high
level
setpoint
low
level
setpoint