Fisher MR730, MR720, MR700, MR480 User manual
TECHNICAL
MANUAL
RESPIRATORY
HUMIDIFIER
MR730
MR720
MR700
MR480
MODELS
Revision
Issued
Copyright © 1991
Auckland,
Fisher
23
Fisher & Paykel
&
HEALTHCARE
D
October
New
1995
Ltd,
Zealand
Healthcare
Paykel
Division
Fisher & Paykel
and
reserve
Fisher &
Healthcare
Fisher & Paykel
P.O.
Auckland,
Telephone:
Facsimile:
Part
Number
Technical
Box
the
right
Paykel
Division.
14348,
New
+64-9-574
+64-9-574
185
Manual
MR730
MR720
MR700
MR480
Healthcare
Electronics
Panmure.
Zealand.
040 646
for
have a policy
to
alter
0100
0158
Respiratory
Dual
Servo
Dual
Servo
Dual
Servo
Single
of
continued
specifications
Limited.
Humidifier
(anaesthesia)
Servo
without
Issued
notice.
23/10/95
models:
product
improvement
Changes
GENERAL
and
version
to
Technical
Rewrite
3.0
software
Manual
Description
and
update
to
Since
of
Change
incorporate
Last
change
Version.
to
Rev H PCB
Page
Affected
various
Numbers
MR730/720/700/480
Technical
Manual # Revision D *
issued
October
1995
CONTENTS
PAGE
1.0
1.1
1.1.1
1.12
1.1.3
12
13
14
1.5
2.0
2.1
2.1.1
2.1.2
2.2
221
222
2.2.3
2.24
23
2.3.1
2.3.2
24
2.5
2.6
2.6.1
2.62
2.6.3
2.7
2.7.1
2.7.2
MR700
Electrical
Standards
Series
Specifications
Models
Model
Common
MR730/720/700
MR480
and
Temperature
Temperature
Temperature
Operating
Adjustable
Airway
Chamber
Push
Mute
Chamber
Standby
Heater
Power
Version
Version
Heater
MR730/720
Warm
MR700/MR730
MR700/MR730
MR720
Standby
MR700/MR730
MR720
Controls
Temperature
Switches
Button
Button
Wire
Up
Seguences
1.0
2.0
Wire
Up
Mode
With
Mode
Standby
General
Electrical
Approvals
Control
Sensing..
Display
..
Controls
Control
Temp
On
in
(Heater
Button..
(MR700/720/730
Switch
Software
and
Version
Mode
Heater
and
and
Version
and
Mode
Specifications
..
Specifications
And
Modes
Control
Wire
On
(MR720,
(All
Wire
MR720(version
MR720(version
2.0/3.0
MR720
MR730
3.0
Software
models
Off
Mode
Software
(Version
(Version
except
(All
Mode
only)
and
1.0)
1.0)
2.0
and
essence
Models).
Only).
...
only).
MR480)..
MR480
in
Heater
in
Non
.
1.0)
Only.
3.0
software
..
Wire
Heater
Mode..
Wire
Mode
and
only)
.....................
1
1
1
„I
wel
1
2
πο
2
+3
…3
....3
3
„3
3
3
3
4
4
....4
4
4
s.m.
„5
5
MR480...
5
ο
5
„5
~
ci
rsrerresserserersererses
5
3.0
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.3.1
3.3.2
3.3.3
3.4
3.5
3.5.1
3.5.2
4.0
41
4.2
4.2.1
4.2.2
4.2.3
Alarms
Temperature
Alarms
In
Heater
Airway
Airway
and
Heater
Wire
temperature
temperature
Chamber
Chamber
Set
Low
Temperature
Heater
WireAlarm.........................
Airway
Airway
Audio
Safety
Temperature
Temperature
Temperature
Alarm
Protection
Microprocessor
Circuit
Introduction
Control
Operation
Board
Control
Input
Analog
Analog
to
Thermistors
Alarm
Alarm.
Heater
ee
Dog
U8
Wire
Alarm..
Alarm
and
U9
U10
b,d,e.
Indicators...
Probe
Alarm
Wire
Mode (MR700/720/730
Alarm........
High
Low
Temp
High
Alarm
Temp
Low
Alarm.
Waming.................
Alarms
in
Non
High
Low
(All
Models)...
Deviations...
Watch
..
Switches
Digital
Converter
Mode
.
only)..
(includes
MR480)..
e.
.6
6
6
6
6
7
7
7
7
8
8
8
.8
.8
.8
.8
…8
9
.9
.9
.9
.9
9
MR730/720/700/480
Technical
Manual
#
Revision D 3#-
Issued
October
1995
CONTENTS
424
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
43
4.3.1
4.3.2
44
5.0
5.1
5.2
53
54
6.0
6.1
6.2
6.2.1
6.2.2
6.2.3
63
6.3.1
6.3.2
6.3.3
64
6.4.1
642
Processor
Power
Power
41
Heater
Watch
Power
Revision
Revision H PCBs.......
Probe
Temperature
Calibration
Introduction
Equipment
Calibration
Calibration
Performance
Control
Line
Interrupt
Line
Interrupt
°C
Comparator
Plate
Overtemperature..
Dog...
Board......
D/F
.....
...
Required.
Procedure
Procedure
Check
Introduction
Performance Check
Equipment
Static
Dynamic
Performance
Equipment
Static
Dynamic
Dual
Probe
Equipment
Test
Required
Test
Sequence
Test
Check
Required
Test
Procedure
Test
Temperature
Required
Procedure
U3
(Revisions
(Revision H PCB)
PCBs
versus
Thermistor
coroa
for
Models
for
Models
MR730/720/700
..
(MR73
Sequence
(MR480)....
.........
(MR480).
Procedure
Test.
..
....
D/F
PCBs).
Resistance..
ces
with
Revision D PCBs
with
Revision F PCBs
ee
(MR730/720/700
(MR480).
00)
esses
veses
or
earlier
or later...
conse
13
13
13
13
„14
SS
.
15
15
15
16
19
7.0
71
72
7.2.1
722
73
74
7.5
7.6
8.0
8.1
82
83
84
8.5
8.6
8.7
8.8
8.9
8.9.1
8.9.2
Servicing
Introduction
Printed
Control
Power
Replacement
Heater
Fault
Screw
Schematics,
MR700
Component
Component
Component
Link
Circuit
Circuit
Circuit
Circuit
Circuit
Circuit
Electrical
Contro!
Power
Information
Circuit
Board
PCB
PCB
of
Revision D Power & Control
Plate
Location
Torque
Settings.
Part
Series
Circuit
Layout - Revision H PCB
Layout - Revision F PCB..
Layout - Revision D PCB
Pad
Locations
Diagrams - Revision H PCB
Diagrams - Revision H PCB.Power
Diagrams - Revision F PCB
Diagrams - Revision F PCB
Diagrams - Revision D PCB
Diagrams - Revision D PCB
Partslist.................
Board
Components:
Board
Components:
Removal
Lists
Layout
for
Programming
..
PCB
and
Mechanical
Block
Diagram
.....
Control
Control
Control
Power
Control
Power
esere
(Revision H PCB)
(Revision H PCB)...
PCB.
PCB
PCB..
PCB.
PCB
PCB
Assemblies...
Drawings
Options - Revision H PCB
...
.
a
20
CONTENTS
PAGE
8.10
8.10.1
8.10.2
8.10.3
8.11
8.11
8.12
8.13
8.14
9.0
9.1
9.2
93
Appendix
Al
A2
A2.1
A22
A2.3
A3
A4
A5
A6
A6.1
A6.2
A6.3
46.4
A7
Mechanical
MR480
Parts
List
Mechanical
MR730/720/700
Heater
plate
Assembly
Exploded
Exploded
Exploded
PCB
Power
Product
Compatibility
Model
Serial
A.
Calibration
Engineering
Programming
Glossary
Error
MR700
Diagrams:
Diagrams:
Diagrams:Heater
Identification
PCB
Harness
Change
of
Software
Number
Number
Engineering
Engineering
Integral
Codes
Series
Serial
Status
Remote
Serial
Explanation
Explanation
conos
Mode...
sine
Menu
display
Functions:
Display
Control
of
Abbreviations
Humidifier
Data
Format
Information.
Standby
Data
Interface
Diagram
....
Revision F & H PCB
....
Parts
Mechanical
Parts.
Parts
(MR730/720/700/480)
MR480..............
MR730/720/700
plate
Assembly
.......................
Connection
History.....
and
Hardware
Diagram
.
..
functions:
Options
Serial
Connector.
Schematic
Non
.
Heater
Heater
Data
Diagrams
MR730/720/700/480
.
cerros
Versions..
00000
eeeeeeeen
eee
rn
Wire
Mode.
Wire
Mode
....
Interface
rire
.
(Inverted
eres
View
55
an
.
nn
Appendix
BI
B2
Appendix
C1
C2
B
Recommended
Recommended
C....
Troubleshooting
MR700
veve
Series
Maintenance
Maintenance
κο.
Fault
Guide
Flow
Schedule...................
Schedule
Checklist...
sous
For
The
Chart
MR700
For
No
Series
Go
Condition
Respiratory
Humidifiers.
ce
....63
.6S
MR730/720/700/480
Technical
Manual # Revision D #
issued
October
1995
page
1
1.0
1.1
1.1.1
MR700
This
respiratory
The
MR730/720
The
MR720
The
MR700
The
MR480
ELECTRICAL
MoDELs
Suppiy
Supply
Supply
SERIES
documentation
humidifiers.
has a lower
model
model
MR730/720/700
Voltage:
Frequency:
Current:
GENERAL
defines
models
is
is a non
SPECIFICATIONS
the
are
Heated
alarm
exclusively a Heated
Heated
-
SPECIFICATIONS
technical
limit
specifications
Wire
humidifiers
and
an
extended
Wire
Wire
humidifier.
230V
+25V
127V x 12V
115V
100V + 10V
50 - 60
Hz
1.0 A maximum
1.9 A maximum
2.0 A maximum
2.4 A maximum
of
the
with
the
warmup
humidifier.
at
230V
at
127V
at
115V
at
100V
MR730, MR720,
option
of
disabling
mode
for
use
in
MR700
the
and
Heater
Anaesthesia.
MR480
Wire.
1.1.2
1.1.3
1.2
Heater
Wire
Capacity:
MobeL
Supply
Supply
Supply
COMMON
Heater
Heater
STANDARDS
Classification
MR480
Voltage:
Frequency:
Current:
ELECTRICAL
Plate
Power:
Plate
Overheat
under
AND
60
230V
115V
100V
50 - 60
0.7 A maximum
1.4 À maximum
1.6 À maximum
SPECIFICATIONS
150
Protector:
APPROVALS
UL544,
JEC601-1,
Operates
CSA-C22.2
W
+25V
+10V
Hz
(ALL
MODELS)
W
at
118
No.125
AS3200.1,
at
230V
at
115V
at
100V
°C + 6
°C
BS5724:Part
1,
DIN
VDE
0750
Teil
1
MR730/720/700/480
Class
1
Type
B
Drip
Proof
Continuous
Not
to
be
used
Technical
Operation
in
the
presence
Manual
of
#
Revision D *
flammable
anaesthetics.
issued
October
1995
page
2
1.3
1.4
1.5
TEMPERATURE
PID
(Proportional
heater
plate.
TEMPERATURE
Temperature
fast
response
chamber
measurement
temperature
outlet.
TEMPERATURE
Three
digit
14mm 7 segment
Range
5.0
to
80.0
Accuracy
25.0
to
CONTROL
Integral
SENSING
probes,
DISPLAY
degrees.
45.0
degrees + 0.3
Derivative)
using
control
standard
located
LED
(Light
Below
5.0
degrees
degree.
of
Heater
characteristic
at
the
patient
Emitting
displays
end
Diode)
Wire
(in
Heated
thermistors
of
the
delivery
display.
'Lo'.
Above
(YSI
80.0
Wire
mode
400
compatible)
tube
and
degrees
operation
at
the
displays
only)
and
mounted
in
humidifying
'Hî'.
」
page
3
2.0
2.1
2.1.1
2.1.2
OPERATING
ADJUSTABLE
AIRWAY
Selects
scale
The
when
CHAMBER
The
difference
The
the
+2
Airway
adjustment.
Every
adjustment
replacing
TEMPERATURE
the
airway
marked
temperature
the
control
CONTROL
temperature
between
setting
chamber
°C
of
marked
display
humidifier
of
the
CONTROLS
CONTROLS
controlling
in
degrees
can
knob
of
the
the
the
Chamber
outlet
set
in
one
as
the
is
the
chamber
normal
CONTROL
temperature.
on
the
front
be
set
with a resolution
is
rotated
(HEATER
gas
WIRE
leaving
chamber
Control,
temperature.
degree
steps
control
also
knob
supplied
control
knob
with
AND
panel.
and
continues
ON
the
chamber
outlet
temperature
when
This
Chamber
and
can
is
rotated
with a fixed
by
preadjusting
the
fixed
knob.
MODES
The
range
of
0.1
to
MODE
is
added
be
set
and
chamber
of
adjustment
°C.
The
set
temperature
be
flashed
for
five
ONLY)
regulated
and
to
the
Control
with a resolution
continues
the
by
the
the
airway
setting
of
has a linear
to
be
control
existing
knob.
knob
temperature
the
flashed
is
from
seconds
Chamber
Temperature
range
of
0.5
°C.
for
This
prevents
to
the
desired
29
to
40
is
flashed
after the
Control
delivered
of
adjustment
The
value
five
seconds
°C
over a linear
on
the
display
last
adjustment.
knob,
it
to
the
Control,
determines
from
is
flashed
after
inadvertent
setting
and
sets
the
patient.
-5
to
on
the
last
then
the
2.2
2.2.1
2.2.2
PUSH
SWITCHES
MUTE
BUTTON
A
momentary
heater
wire
mode
A
secondary
engineering
On
every
CHAMBER
For
MR700
Operation
chamber
is
active.
This
For
MR700
Operation
chamber
is
active.
seconds
This
initial
TEMP
of
outlet
On
button
of
outlet
On
before
button
menu
is
is
push
will
disable
which
is
ten
minutes).
function
Series
this
release
used
Series
this
release
used
is
that
in
conjunction
(refer
Appendix
push
of
the
mute
BUTTON
Humidifiers
switch causes
temperature. A green
of
this
switch
in
conjunction
Humidifiers
switch
causes
temperature. A green
of
this
switch
blanking
momentarily
in
conjunction
an
audible
alarm
with
A2).
button a momentary
with
Version
the
airway
temperature
LED
adjacent
the
with
with
the
with
display
Version
airway
LED
the
display
and
reverts
the
mute
2.0
temperature
adjacent
continues
reverting
the
mute
for 3 minutes
the
Chamber
audio
1.0
Software:
display
to
the
switch
immediately
to
enter
the
and
Version
display
to
the
switch
te
show
to
show
to
enter
the
(except
Temp
beep
to
low
switch
indicates
momentarily
is
enabled
to
show
engineering
3.0
Software:
to
momentarily
is
enabled
the
chamber
the
airway
temperature.
engineering
temperature
enables
function
blank
to
indicate
the
airway
menu
(refer
blank
to
indicate
outlet
menu
(refer
alarm
in
entry
to
the
operation.
then
show
that
this
temperature.
Appendix
then
show
that
this
temperature
Appendix
non
the
function
A2).
the
function
for
2
A2).
2.2.3
STANDBY
This
amber
standby
To
beep
BUTTON
button
has
to
LED
starts
to
mode.
exit
Standby
mode
accompanies a change
MR730/720/700/480
(MR700/720/730
be
depressed
flash
press
for
(100/minute)
the
Standby
in
the
Technical
ONLY)
one
second
to
enter
the
button
can
then
button
for
1s,
Standby
mode
state.
Manual # Revision
or
exit
the
be
released
the
amber
D. 3 Issued
standby
and
LED
will
mode.
the
Humidifier
then
October
When
turn
the
off.
1995
adjacent
remains
An
audio
in
the
page
4
2.2.4
2.3
2.3.1
HEATER
This
mode.
Pressing
wire
switching
POWER
VERSION
After
information
.
.
WIRE
is a latching,
The
adjacent
this
alarm
will
to
UP
1.0
switch
is
Watchdog
Display
Temperature
Chamber
9
Software
Maximum
9
Audio
SwiTCH
push
green
switch
will
commence
the
non
heater
SEQUENCES
SOFTWARE
on
the
humidifier
flashed
circuit
Test
Control
Control
Version
Heater
Beep
(MR720,
operated,
cause
MR730
switch
LED,
if
an
audible
if
switching
wire
mode
goes
on,
through
for 2 seconds.
test
Setting
setting
Number
Plate
Setting
ONLY)
which
selects
indicates
to
if a heater
If
All
Airway
eg
If
displayed
that
beep
and
the
heater
wire
the
following
successful
indicator
Temperature
'37.0'
heater
1.0
eg'110'
between
the
humidifier
the
LED
wire
mode
is
connected.
the
'SEE
LEDs
is
displayed
wire
mode
eg
'-1.0'.
the
heater
is
changes
with
no
sequence.
MANUAL'
are
illuminated
display
is
selected
Not
applicable
wire
mode
operating
to
indicate
heater
wire
Note
that
LED
and
then
the
for
and
in
the
heater
the
new
connected
each
displayed
lights
briefly.
'8.8.8.'
is
chamber
MR480
non-heater
wire
wire
mode.
state. A heater
or
if
displayed
control
on
the
setting
is
2.3.2
2.4
VERSION
After
displayed
.
ㆍ
.
9
.
9
2.0
switch
for 2 seconds,
Watchdog
Display
Model
Software
Temperature
Chamber
Maximum
Audio
HEATER
In
regulated
condensation.
adjusted
knob
the
WIRE
Heater
to
to
is
used
maintain
control
AND
on
the
Test
Number
Version
Beep
ON
Wire
To
for
this
circuit
Control
Heater
minimise
VERSION
3.0
humidifier
then
test
Number
Control
Setting
setting
Plate
MODE
On
Mode
the
desired
(ALL
rainout
at a fixed
purpose,
SOFTWARE
goes
through
the
display
Setting
MODELS
(heater
temperature
or
offset
from
see
2.1.2
is
momentarily
If
successful
All
the
eg
'730°
eg
'2.0'
eg
'37.0'
If
heater
is
displayed
ερ
110'
wire
switch
maximise
the
above.
the
following
the
indicator
Airway
EXCEPT
set
LEDs
Temperature
is
displayed
wire
mode
eg
MR480)
green
LED
and
humidity,
humidification,
airway
temperature.
sequence.
blanked.
'SEE
MANUAL'
are
illuminated
is
selected
'-1.0'.
Not
on)
the
within
the
Note
display
then
applicable
heater
close
chamber
The
front
that
each
LED
lights
and
'8.8.8.'
the
chamber
for
MR480
plate
and
limits
with a minimum
outlet
panel
information
briefly.
is
displayed
control
heater
wire
temperature
Chamber
Control
is
on
setting
are
of
can
be
2.5
MR730/720
In
the
non
Heater
temperature
heater
plate
backup
at
low
safety
flow
IN
HEATER
Wire
mode
is
maintained
to
deliver
mode,
rates
the
to
limit
(below 5 L/minute)
WIRE
of
the
by
heater
selected
temperature.
the
chamber
OFF
MODE
MR730/720
plate
control
outlet
is
enhanced
AND
MR480
(heater
The
temperature
only.
sensor
at
the
wire
The
sensor
at
to a maximum
sacrifice
switch
at
the
chamber
of
green
the
some
LED
off)
delivery
outlet
of
66
low
flow
the
delivery
hose
end
controls
is
employed
°C.
In
this
way
performance.
in
a
safety
the
page
5
2.6
2.6.1
2.6.2
2.6.3
WARM
The
conditions
UP
Low
temperature
are
MODE
met:
MR700/MR730
the
airway
the
airway
software)
e
the
airway
MR700/MR730
the
airway
the
airway
the
airway
further
Note:-
switches
And a low
MR720
15
In
this
mode
on.
At
temperature
WITH
VERSION
minutes.
alarm
AND
MR720(VERSION
temperature
gets
temperature
temperature
AND
MR720(VERSION
temperature
temperature
temperature
the
this
audio
time
alarm
gets
the
2.0/3.0
is
disabled
within
does
not
increase
does
not
get
above
does
not
increase
increases
alarm
is
heater
plate
mute
is
for
SOFTWARE
during
1.0)
IN
0.8
degrees
within 2 ºC
1.0)
IN
30
°C
by 2 °C
not
enabled
circuit
10
minutes,
warm
up.
HEATER
of
by 2 °C
of
NON
HEATER
by 2 °C
within
for
switches
during
It
is
enabled
WIRE
MODE
the
temperature
within 4 minutes
the
set
point
within
WIRE
MODE
within
15
minutes
15
minutes
30
seconds
but
still
after
off.
which
the
as
soon
control
(2
minutes
.
ten
AND
has not
the
Airway
heater
as
any
setting.
for
minutes
MR480
reached
Temp
plate
is
of
the
following
version
of
switch
30
°C
Low
enabled.
3.0
after
LED
on.
a
2.7
2.7.1
2.7.2
If
the
above
mode
for
20
STANDBY
MODE
MR700/MR730
The
standby
be
emitted
In
the
nominal
Standby
warm
A
Remote
LED
MR720
The
warm
for
While
a) If
enter
the
b)
If
completion
conditions
once
standby
40.0
mode
up
mode
Standby
permanently
STANDBY
MR720
up
conditions
version
unit
3.0
in
standby
the
airway
warm
re-enters
the
airway
and
up
of
warm
up
conditions
minutes
mode
for
version
AND
MR720
can
be
successful
mode
all
Low
°C
and
the
is
automatically
is
entered
request
on.
MODE
has a special
are
not
mode:
temperature
mode.
The
Standby
temperature
the
standby
if
these
are
are
2.0
(VERSION
entered
or
entered
or
Temperature
heater
wire
exited
(the
low
temperature
(see
Appendix
(VERSION
feature
where
met.
This
increases
unit
then
mode.
has
not
period,
not
initial
met,
not
initially
software
1.0)
exited
by
exited
standby
alarms
is
on a 15%
after
20
A6.3)
2.0
AND
it
will
standby
by 2 °C
rechecks
increased
warm-up
the
unit
alarms.
met
the
and
30
minutes
ONLY
depressing
mode
are
inhibited,
duty
minutes
alarms
remain
enables
3.0
SOFTWARE
go
into a standby
mode
time
at
any
time,
warm-up
exiting
by 2 °C
resumes.
MR720
for
the
standby
(refer
cycle.
(30
minutes
disabled - refer
the
standby
ONLY)
is
20
minutes
the
conditions
or
come
The
will
automatically
version
3.0
button
2.2.3)
the
heater
for
version
mode
mode
automaticaliy
for
MR720
will
and
within 2 °C
unit
then
rechecks
enter
the
standby
software
(refer
2.7).
for 1 second. A beep
plate
is
3.0
section
and
turns
version
exit
stand
if
these
of
the
warm-up
controlled
software)
2.6).
the
after
2.0
are
set
to
and
standby
turn
and
30
by
mode
not
met, then
temperature
exiting
will
a
the
amber
on
if
the
minutes
and
by
MR730/720/700/480
Technical
Manual # Revision D #
Issued
October
1995
page
6
3.0
3.1
ALARMS
AND
TEMPERATURE
If
the
airway
temperature
Probe
alarm
will
flashing
Five
display,
(a)
(b)
(©)
(d)
Temperature
specific
as
shown
fault
--- . Temperature
---,
--.-
-
-.-.
INDICATORS
PROBE
be
types
below:
Low
Open
Open
Open
Very
Short
Very
Short
Very
ALARM
probe
enabled.
Probe
red
can
be
temperature
circuit
circuit
circuit
low
temperature
circuit
high
temperature
circuit
high
temperature
Indication
is
disconnected
LED
and
diagnosed
Probe
not
(~0
chamber
in
common
patient
airway
chamber
patient
airway
is
by
an
audio
and
plugged
°C)
outlet
lead
probe
(~0 °C)
outlet
(~100
probe
(~100
or
develops a low
a'-
- -'
message
alarm.
are
displayed
in.
probe
in
probe
probe
°C)
°C)
on
by
cable.
or
the
airway
the
sequence
high
resistance
the
Temperature
temperature
of
‘decimal
points’
display
plus
in
a
the
3.2
3.2.1
(e)
The
faults
does
not
A
Temperature
Once
the
ALARMS
HEATER
If
the
heater
alarm
LED
~
circuits
the
heater
An
open
On
MR720/730
2.9.4).
Note:
If
'F-2'
section
-.- - Short
(a
to
d)
above
immediately
Probe
alarm
condition
IN
HEATER
WIRE
ALARM
wire
is
disconnected
will
start
will
be
shutdown.
wire
fuse
is
circuit
heater
if
the
is
displayed
and
5).
in
probe
are
checked
cause
any
Alarm
immediately
has
been
WiRE
Mope
flashing
and
The
open
circuit).
wire
fuse
Heater
Wire
the
F2
cable
between
for
apparent
removed
(MR700/720/730
or
there
the
audio
display
is
indicated
is
connected
fuse
is
intact
will
patient
at a rate
of
operating
shuts
down
the
humidifier
is a fault
alarm
wili
continue
by
‘F-2'
but
then
check
airway
about
twice
anomaly
both
heater
will
with
the
heater
be
enabled.
to
indicate
appearing
switched
the
calibration
probe
per
is
checked
wire
enter
onLy)
wire
Both
the
temperature
on
the
off,
the
and
chamber
second.
The
twice a minute.
and
heater
warm
up
mode
circuit,
then
heater
wire
sensor
Airway
alarm
of
will
the
Temperature
sound
41°C
outlet
probe
final
fault
plate.
(refer
the
Heater
and
reading
(refer
overheat
(e)
section
Wire
heater
(unless
display.
section
(refer
which
2.6).
plate
3.2.2
AIRWAY
The
delivered
instantly
TEMPERATURE
red
Airway
to
disables
Temp
the
patient
both
HIGH
High
LED
is
2°C
heater
ALARM
will
flash
higher
than
circuits.
and
an
audible
the
Temperature
alarm
will
Control
sound
if
the
gas
setting. A high
temperature
temperature
alarm
being
page
7
3.2.3
3.2.4
AIRWAY
The
red
Airway
delivered
Notes:
If
Airway
heater
wire
heat
for a further
This
alarm
CHAMBER
This
alarm
1)
The
chamber
Temperature
2)
The
temperature
This
alarm
start
flashing.
the
high
temperature
TEMPERATURE
Temp
to
the
patient
Temperature
circuits
is
TEMP
will
temperature
will
100
disabled
HIGH
activate
of
set
temperature
Control
temperature
causes
by
10
the
The
audio alarm
of
condition
LOW
ALARM
Low
LED
is
2°C lower
Low
alarm
switch
seconds,
during
ALARM
if:
gas
leaving
for
setting
the
gas
°C
or
more.
heater
circuits
will
flash
(4°C
condition
off.
Pressing
the
Airway
warm-up,
the
more
and
the
leaving
to
(which
is
cleared.
and
an
audible
for
MR720
persists
the
Temperature
see
section
mute
2.6.1.
model)
for
button
humidification
than
20
minutes.
Chamber
the
switch
can
Control
humidification
off
and
be
muted)
is
alarm
than
more
than
will
Low
LED
chamber
(The
chamber
setting).
chamber
the
Chamber
also
enabled.
will
sound
the
Temperature
100
silence
will
outlet
is
set
outlet
Temp
This
if
the
seconds
the
Audio
continue
more
than 4 °C
temperature
exceeds
High
alarm
gas
temperature
Control
the
heater
alarm
to
flash..
is
the
chamber
amber
LED
remains
setting.
plate
and
resume
higher
the
sum
indicator
active
being
and
than
of
set
until
the
the
to
3.2.5
3.2.6
CHAMBER
This
alarm
For
Chamber
The
temperature
chamber
OR
For
Chamber
The
temperature
minutes.
THEN:
The
Chamber
muted)
mute
SET
Version
This
LED
is
button
LOW
alarm
will
adjusted
Temp
Low
will
activate
Set
Temperature < 35°C
of
set
temperature
Set
Temperature > 35°C
of
Temp
enabled.
will
silence
WARNING
1.0
and
Version
will
activate
immediately
above
31.0
ALARM
gas
leaving
gas
leaving
Low
This
be
°C.
if:
for
more
alarm
alarm
the
Audio
2.0
Software
if
the
enabled
There
the
humidification
than
20
the
humidification
amber
LED
remains
active
alarm.
chamber
is
and
remain
no
audible
set
chamber
minutes.
chamber
will
begin
to
until
the
low
temperature
on,
until
is
such time
alarm.
outlet
is
less
outlet
is
less
flash
and
the
temperature
below
31.0
as
the
than
than
audio
condition
°C.
In
this
chamber
4°C
31°C
alarm
is
case
set
lower
than
for
more
(which
can
cleared.
the Set
temperature
the
than
20
be
Pushing
Low
amber
is
the
Version
This
3.0
alarm
Software
will
34.0°C.
In
these
cases
set
airway
or
chamber
MR730/720/700/480
activate
the
Set
Low
if
either
the
amber
LED
temperature
Technical
is
chamber
will
immediately
adjusted
Manual
set
temperature
above
34.0
#
Revision
or
be
enabled
°C.
D #
Temperature
and
remain
There
is
no
Issued
control
on,
audible
October
setting
until
alarm.
1995
is
such
below
time
as
the
page
8
3.3
3.3.1
3.3.2
3.3.3
3.4
TEMPERATURE
HEATER
This
(Heater
begins
AIRWAY
The
delivered
AIRWAY
The
delivered
Notes:
The
Pushing
the
This
AUDIO
WIRE
indicates
Wire On
and
the
TEMPERATURE
red
Airway
to
the
TEMPERATURE
red
Airway
to
the
audio
alarm
the
mute
Airway
alarm
Temp
is
ALARM
disabled
ALARMS
ALARM
that a heater
LED
heater
Temp
patient
Temp
patient
is
not
button
Low
wire
is
off). In
plate
is
HIGH
High
is
41°C
LOW
Low
is
29.5
enabled
disables
LED
during
IN
NON
has
this
switched
ALARM
LED
will
or
higher.
ALARM
LED
will
°C
or
for
30
the
will
continue
warm-up,
HEATER
been
connected
case
the
off.
flash
Power
flash
less.
seconds
audio
to
see
WIRE
Heater
and
an
to
and
an
after
alarm
and
flash.
section
MODE
when
Wire
audible
the
heater
audible
the
low
restores
2.6.2.
(INCLUDES
the
non
heater
alarm
LED
alarm
will
sound
plate
is
immediately
alarm
will
sound
temperature
power
to
wire
will
LED
the
MR480)
mode
be
flashing,
if
the
gas
shut
if
the
gas
begins
heater
plate
has
been
selected
the
audio
temperature
off.
temperature
flashing.
for
ten
minutes,
alarm
being
being
3.5
3.5.1
A
choice
of
the
ISO
draft
control
A
a
until
audio
SAFETY
TEMPERATURE
‘An
of a Low
however
There
Firstly,
monitors
at
Secondly, a bimetallic
exceeds
by
Heater
heater
link
momentary
low
temperature
the
alarm
alarm
PROTECTION
over
temperature
Temperature
remains
are
two
an
the
41.0
degrees.
118
gaining
plate
plate
(L1),
refer
depression
alarm
condition
to
be
re-enabled.
DEVIATIONS
on
independent
over
temperature
airway
°C + 6
°C
access
to
temperature
limits
of
alarm condition
until
thermistor
the
50,
standard
Appendix
of
the
mute
in
no
heater
clears.
alarm,
(ALL
the
backup
Any
MODELS)
pressing
fault
protection
sensor.
thermostat
and
opens
under
surface
is
limited
80
and
90
audio
A3.
button
wire
new
causes
has
over
fixed
the
mains
to
°C
110
alarm
or a gliding
will
mode,
alarm
an
immediate
Mute
causes
cleared.
temperature
circuit
independent
This
backup
to
the
heater
active
of
the
heater
°C
max
can
be
selected.
silence
the
see
3.3.3.
condition
heating
protection
protection
plate
supply.
plate
and
during
normal
(Refer
tone
can
audio
alarm
The
relevant
occurring
shut
down
to
recommence,
circuits.
of
the
microprocessor
is
preset
operates
On
if
cooling,
manually
operation
Appendix
be
selected
within a mute
of
both
to
the
this
by
for
about 3 minutes
LED
indicators
heater
the
Low
disconnect
heater
plate
protector
depressing
(80
°C
A3.)
the
programming
remain
delay
circuits.
Temperature
control
continuously
the
temperature
can
the
red reset
for
MR720).
(except
will
cause
In
heating
only
be
button.
for
flashing
the
the
case
LED
circuits
reset
Optional
3.5.2
MICROPROCESSOR
A
control
detected a hardware
additional
LED
The
on.
watch
loop
in
the
hardware
dog
circuit
WATCH
DOG
operating
reset
circuit
disables
is
tested
the
software
attempts
heating
at
turn
on
continuously
to
re-initialise
circuit,
by
deliberately
monitors
blanks
for
the
microprocessor.
the
display and
halting
the
correct
operation.
turns
the
processor
If
this
is
Humidifier
and
forcing
Should a fault
not
successful
Fault
be
red
initialisation.
page
9
4.0
41
4.2
4.21
CIRCUIT
INTRODUCTION
This
in
Sections
CONTROL
The
one
for
the
software
CONTROL
Three
dual
1. . A
OPERATION
section
temperature
describes
8.6
BOARD
basic
MR730/720/700/480
version.
THERMISTORS
standard
thermistor
temperature
humidifier
2. A second
humidifying
control
3. A third
J3-1,3).
the
thermistor
This
briefly
the
to
8.8.
control
thermistor
board,
with
range
characteristic
probe
is
mounted
(connector
front
panel.
thermistors
sensor,
in a probe
J4-1,3).
mounted
chamber
chamber
prevents
(connector
outlet
is
permanently
excessive
operation
various
discreet
of
humidifiers.
control
another
thermistor
at
the
This
temperature
in a probe
J4-2,3).
temperature.
mounted
heater
of
each
of
hardware
Each
all
temperature
monitors
end
of
the
measures
In
heater
in
intimate contact
plate
temperatures
the
circuit
sections.
changes, provides
model
however
functions.
the
heater
delivery
is
indicated
the
wire
hose
chamber
mode
during a warm
Refer
is
controlled
Two
plate
temperature.
to
measure
by
the
digital
temperature
this
thermistor
with
the
heater
up
to
the
circuit
the
controlling
by a unique
thermistors
delivered
display
at
the
top
is
used
plate
cycle.
on
to
(HP)
diagrams
functions
are
used
airway
the
of
the
monitor
(connector
in
a
and
4.2.2
4.2.3
INPUT
ANALOG
SWITCHES
The 1 by 8 analog
reference
potentiometer
across
From
chamber
ANALOG
The
suppression.
pass
voltage
with
discharged
gain
Under
ramps
referenced
level
the
potentials.
VR3,
resistors
the 3 by 2 analog
temperature
outlet
TO
DIGITAL
R18,
temperatures
probe
The
operational
amplifier
transients
R35
connected
state.
of
about
0.5
processor
up
of
UI0d
speed
control
(0.1-5ms).
via
R41
the
up
capacitor
U8
AND
switch
(U8)
selects
Selected
and
R17
CONVERTER
selected output
sequentially
offset
potentiometer
and
R16,
switch
(U9)
from
inputs
are
filtered
of
with a gain
appearing
(through
With
giving a resting
to
output
VR5
(PB6)
This
the
of
C24,
at
its
an
and
when
rising
output
the
comparator
is
fed
input.
analog
R34
level
ramp
voltage
US
under
and
from
under
the
dual
U10
B,D,E
the
analog
of
11.
The
switch
connected
of
the
switch
voltage
level
to
the
RST
processor
are
potentials
VR2.
(7):
the
processor
probe
temperature
by
the
C30, C31,
switch
This
stage
integrating
in
U9)
to
about
-2.5
section
is
fed
of
U10d.
stage
U10e
6.5
interrupt
control
(PB0-3)
giving;
(4-6):
calibration
heater
plate
control
(PB4-6)
R28,
network
is
filtered
stage
U10b
across
the
the
non-inverting
to
-3
volts
of
U9
across
via
R36
to
When
switches
input
various
(0-3):
the
temperatures
(HP)
thermistor.
the
airway
sensor
U8,
R26,
U9
with
are
C19,
is
fed
C23
rests
for
integrating
input
at
the
output
C22
is
the
comparator
the
ramp
voltage
high.
This
of
U3.
input signals
position
of
temperature
also
read.
C20
network
to
pin
to
give
most
of
capacitor
of
U10b
pin
1.
opened
stage
exceeds
fast
rising
and
of
the
temperature
9,
34.5
and
and
for
EMI
10
of
U10d, a low
protection
the
C22
the
the
U10e
edge,
from
time
(50-60ms)
holding
stage
has a ‘static’
output
of
where
the
threshold
assisted
60
°C
the
any
it
ina
U10b
it
is
by
set
4.2.4
PROCESSOR
After
selecting
pause
linear
will
cause a RST6.5
MR730/720/700/480
to
allow
ramp
CONTROL
output
one
U10d
and
U3
of
the
10
to
settle.
the
14
interrupt
Technical
input
At
this
bit
counter
to
occur.
signals
point
in
The
Manual
through
the
switch
U4
is
processor
№
the
switch
across
started.
on
responding
Revision
network
the
Within a time
D. # issued
of
integrator
to
U8,
U9
U10b
period
the
interrupt,
October
there
is
of
100ns
is a
50-60ms
opened
to
first
stops
1995
initiating
Sms
the
a
ramp
the
counter,
network
equated
during
calibration
then
U8,
to
the
calibration
performed,
U9
input
closes
can
now
signal.
to
give
the
switch
be
stepped
In
the
desired
and
the digital
this
across
to
the
way
all
ramp
display
page
the
integrator
next
10
input
rate.
updated.
10
input.
channels
Thus
readying
The
14
all
points
it
for
bit
counter
are
continuously
are
scanned
the
next
can
once
now
cycle.
The
be
read
scanned.
every
input
switch
and
its
value
VRS
is
set
500-600ms,
self
4.2.5
4.2.6
4.2.7
POWER
A
R56
software
enabling a zero
frequency
Power
The
ground
any
frequency
triac
common
41
Operational
inverting
inverting
ensure
(OVHT)
switching
both
A
resistor
clamped
LINE
sample
of
and
O1,
determines
thus
LINE
zero
crossing
referenced
unwanted
facilitating
switching.
error
°C
COMPARATOR
input
input
that
the
is
fed via the
transistors
heaters
watch
dog
R31
off
INTERRUPT
the
buffered
INTERRUPT
amplifier
to
failure,
to
in
power
supply
by
the
supply
crossing
eliminating
is
derived
when
noise
from
the
The
ADC
from
this
source.
U10c
pin 5 is
goes
output
connected
to
an
pin 7 of
isolating
Q10
be
shut
down.
which
the
inverting
the
event
(REVISIONS
frequency
Schmitt
detector
any
D/F
trigger
frequency
for
triac
common
is
USf
facilitating
switching.
error
(REVISION H PCB)
from
the
10Vac
the
diodes
D13 - D16
the
zero
crossing
generation
is
also
is a protection
adjustable
and
is a high
input
of a processor
phase
directly
U10c
diode
Q12.
of
of a real
synchronised
circuit
(via
divider
is
low
resistor
In
this
output
U10c.
crash.
PCBs)
derived
circuit.
above
way, a patient
from
from
and
fed
to
the
The
from
this
secondary.
are
not
The
time
clock
with
to
sense
connector
network
an
R32,
input
networks
USg,
This
also
ensures
the
the
generation
ADC
source.
Resistor
conducting.
operating
and
excessive
J4-1)
temperature
D19,
airway
is
communicated
power
RST7.5
is
also
R61.ensures
software
also
enabling a zero
the
line
to
the
VR4,
R33.
R55
and
temperature
that
both
transformer
interrupt
of a real
Network
of
time clock and
phase
synchronised
Ri,
that
determines
frequency
delivery
patient
VRA
of
41
D20,
thus
temperature
airway
is
set
°C.
R61
greater
via
isolating
heater
control
22Vac
secondary
U3.
The
operating
the
secondary
R69,
and
the
supply
crossing
eliminating
rise.
thermistor.
during
calibration
This
low
to
clamp
the
than
diode
circuits
via
also
with
the
is
C2
removes
detector
any
The non
The
output
bases
41°C
causes
D11
and
are
line
for
to
of
4.2.8
4.2.9
HEATER
Thermistor
plate
cools
maximum
Also
electronic
primary
mechanical
heater
WATCH
During
the
wave,
13
through
input
nature
initialise,
deliberately
the
and
PLATE
HP
limit
(default
below
heater
mounted
control
and
plate
DOG
operation
state
of
output
buffered
of
USg
is
R3
forces
of
the
it
fails
processor
also
tums
OVERTEMPERATURE
senses
the
heater
110
°C)
during
this
limiting
plate
on
thus
causes
cut
out
module.
by
held
giving a high
re-initialisation
fault.
in a safe
halting
has
off
temperature.
temperatures
the
heater
system
complete
must
be
the
processor
port
PB7
USb,
is
hard
up.
The
purpose
program
failed
the
the
display
plate
fail.
manually
of
fed
Should
output
of
mode.
execution
high
plate
temperature.
normal
Under
can
is a mechanical
This
mechanical
shut
down
reset
is
continually
U4
every
to
the
charge
this
square
from
pin
the
processor
of
this
is
The
watch
and waiting
output
of
I.C.
U7
to
blank
operation,
certain
be
selected.
118
cut
of
the
by
means
monitored
16.6
or
20ms
pump
wave
12,
which
which
to
ensure
dog
circuit
U5g
also
the
Should
the
power
operating
(See
Appendix
°C
cut
out
is
connected
humidifier
of
the
reset
for
(power
circuitry
may
that
for
digital
C16,
be
interrupted
drives
the
or
may
if
the
is
tested
initialisation
turns
on
display.
heater
plate
to
the
heater
plate
conditions,
A3:
out
which
will
in
series
should a serious
button
located
correct
function.
line
frequency
D4,
DS
for
trap
interrupt input
not
be
processor
every
time
via the
Q3
which
and
any
successful
should
lights
exceed
the
is
discontinued
for
increased
Programming
give
protection
with
the
fault
on
the
This
is
interrupt).
C15
which
reason,
depending
fail,
the
humidifier
watch
the
'see
C15
of
and
dog.
maximum
safety,
Control
should
power
transformer
develop.
underside
done
by
This
ensures
will
discharge
U3.
This
is
unable
is
tumed
To
indicate
manual’
heater
until
it
lower
Options.)
the
The
of
the
changing
square
that
pin
high
trap
on
the
to
re-
on
that
LED10
by
page
11
43
4.3.1
4.3.2
POWER
Revision
A
circuit
stabilized
The
the
UA
The
signal,
connected
Wire.
Тнас
Q12,
Transistors
BOARD
D/F
PCBs
bridge
rectifier
is
protected
by
Q8,
Heater
Wire
optoisolator
on
the
control
resistor
with
ОП
and
R52
processor
or
open
(mounted
HPC.
Q5
and
U11
REVISION H PCBS
A
bridge
rectifier
circuit
is
protected
stabilized
by
O8,
(D13-D16)
by a 1
Amp
is
derived
(HHC)
is
which
from
controlled
in
board.
connected
to
interpretation,
circuit
and
on
the
heatsink)
Q6
are a RS232
(D13-D16)
by a 1
is
derived
supplies
Amp
from
supplies
turn
the
fuse
the
is
anode
power
(Fi)
voltage
by
driven
provides
also
the
integrity
is
level
power
fuse
(F1)
the
voltage
to
the 5 volt
mounted
on
doubling
triac
Q9
which
by
Q10.
of
Q9
provides a signal
the
information
of
fuse
controlled
driver
mounted
by
for the
to
the 5 volt
on
doubling
regulator
the
circuit
network
is
mounted
O10
is
Q7
board.
D17, D18.
controlled
through
to
determine
F2, the 4 Amp
optoisolator
serial
regulator
the
circuit
network
U12,
data
interface.
Q7
board.
D17,
mounted
The 5 volt
on
the
directly
(HHS)
fuse
which
mounted
The 5 volt
D18.
on
the
negative
heat
sink.
from
an
to
USd
if
the
Heater
supplying
in
turn
on
the
power
negative
heat
sink.
supply
Q9
is
switched
output
and
U4.
Wire
is
to
the
is
controlled
heat
sink.
supply
This
port
This
Heater
by
This
by
of
The
Heater
the
optoisolator,
U4
on
balance
Heater
D21,
triac
not
connected
cycle.
interpretation,
also
Q11
output
with
Transistors Q5
Wire
the
control
the
heater
wire
sensing
R66
and
off
and a heater
The
output
the
integrity
controls
port
(HPC)
C33
form a snubber
R67.
then
provides
power
(HHC)
U11,
board
of
and
wire
is
R51
the
of
fuse
to
on
Q6
is
controlled
which
in
turn
(HHC).
with
accomplished
and
wire
Resistor
respect
R52
connected
optoisolator
the
optoisolator
the
information
F2, the 4 Amp
the
heater
plate
U4
on
the
control
for
the
triac
are a RS232
by
is
driven
to
ground.
through
limit
then
will
feeds
and
and
level
triac
Q9
by
R9,
C6
the
the
current
the
optoisolator
be
turned
U4
to
determine
fuse
supplying
is
under
board.
the
optoisolator.
driver
which
is
mounted
Q10.
Q10
form a snubber
optoisolator
through
will
on
and
off
on
the
control
if
the
power
control
Resistors
for
the
R64,
serial
on
the
is
controlled
on
the
U13
and
associated
the
LED
when
remain
in
board.
Heater
to
of
optoisolator
R57
data
off.
synchronisation
This
Wire
is
the
Heater
limit
interface.
heat
sink.
directly
triac.
Capacitors
the
triac
Otherwise
with
signal,
connected
Wire.
U12
and
the
gate
O9
is
from
an
output
C8,
components
is
on
or
if a heater
the
secondary
with
processor
or
open
transistor
current
to
switched
port
C32
R51,
off.
With
wire
circuit
Q12
via
the
triac
by
of
R52,
the
is
and
an
and
MR730/720/700/480
Technical
Manual
Revision D #
Issued
October
1995
page
12
44
PROBE
TEMPERATURE
TEMP
CO
0
9
28
29
30
31
32
33
34
35
VERSUS
RESISTANCE
THERMISTOR
(Ohms)
7352.8
4702.2
1976.6
1893.3
1814.4
1739.2
1667.2
1598.2
1532.9
1470.6
RESISTANCE
TEMP
CC)
36
37
38
39
40
41
42
43
44
60
RESISTANCE
(Ohms)
14113
1355.0
1301.0
1249.2
1199.6
1152.3
1107.3
1064.5
1023.1
560.3
page
13
5.0
5.1
5.2
CALIBRATION
INTRODUCTION
Calibration
calibration,
Note:
Calibration
There
the A to D converter.
This
error
any
repair
with
Calibration
calibration
EQUIPMENT
1)
should
be
performed
perform a performance
For
instructions
is
facilitated
are
only
two
adjustments
calibration
messages
the A to D converter
procedure
in
the
that
may
have
should
be
performed
display)
checked
after
REQUIRED
41
°C
calibration
probe,
after
check
on
disassembly
by
entering a special
VR4
may
be
carried
or
if
any
altered
the
potential
would
require a calibration
and
performed
the
unit
has
available
any
of
the
and
VR5,
of
warmed
in
MR700
as
out
the
servicing
involving
outlined
unit,
refer
Calibration
the
41
if
the
unit
circuit
boards
of
the
+5
after
the
up.
series
the
in
section
to
6.0.
Section
mode.
°C
comparator
is
thought
have
or
-5
volt
check.
unit
has
been
calibration
printed
7.0
Servicing
See
Appendix
stage
to
be
been
replaced
rails
or
running
kit
(F
circuit
boards.
Information.
Al.
and
the
out
of
calibration
or
component
for
at
dz P part
After
setting
of
(E0x-E7x
repaired.
change
least
half
no.
900MR548).
the
span
of
In
particular
associated
an
hour;
ie
5.3
Models
2)
3)
CALIBRATION
(See
1)
2)
3)
Before
Heater
For
MR480
with a 100mm
product
With
models
Wire
switch
Plug
in
Gain
access
humidifier
4)
With
model
the
control
5)
With
the
6)
Using
the
7)
Adjust
off
VR4
Serial
Wire
module.
only - jumper
length
PROCEDURE
change
MR730/720/700
is
on
the
41
°C
to
the
front
MR480
board.
Chamber
Chamber
VR4
slowly
and
recheck
Number
92XXAAA05495
connector
of
cable
and a 22K
FOR
history - section
ensure
(Heater
calibration
Wire On
adjustment
probe.
potentiometers
panel.
only
connect
Temp
button
Temp
button
so
the
display
that
VR4
is
cable,
MODELS
9.0
for
that a Heater
LED
the
jumper
held
down
step
through
just
changes
not
rotated
(Revision D PCB
which
consists
resistor.
WITH
REVISION D PCBS
serial
number
should
be
VR4
cable
turn
on
to
number
from
past
this
details).
Wire
module
on).
and
VRS,
from
pin 7 of
the
power
-4-
vertical
display
and
of
two
easy
is
connected,
by
removing
U10
switch.
to
horizontal
transition
earlier)
hooks
OR
EARLIER
the
to
the
cathode
Display
bars
point.
connected
and
that
the
control
end
should
(||||||
to
board
show
===).
in
series
Heater
from
of
D7
-1-
the
on
Back
8)
Using
the
Chamber
9)
Remove
10)
Adjust
11)
Calibration
the
41
VR5
for a display
is
MR730/720/700/480
Temp
°C
calibration
complete;
Technical
button
probe.
reading
do
performance
step
to
number
-5-
of zero. ( 0)
check
(section
6.0).
Manual # Revision D #
issued
October
1995
page
14
|
5.4
CALIBRATION
(See
product
Plug
Gain
in
access
1)
2)
humidifier
With
3)
4)
5)
the
Using
the
Starting
rotated
where
all
Using
6)
7)
8)
9)
the
Remove
Adjust
Calibration
PROCEDURE
change
the
with a vertical
too
the
VRS
history - section
41
°C
calibration
to
the
adjustment potentiometers
front
panel.
Chamber
Chamber
far
the
display
the
segments
Chamber
41
°C
calibration
for a display
is
complete;
Temp
Temp
Temp
FOR
probe.
button
button
bar
display
becomes
of
the
all 8 display
button
probe.
reading
do
performance
MODELS
9.0
for
held
down
step
through
adjust
all
step
to
of
zero. ( 0)
WITH
REVISION F PCBS
serial
number
VR4
turn
on
to
number
VR4
so
the
horizontal
number
check
are
of
bars
equal
-5-
(section
details)
and
VRS,
the
power
-4-
display
((j.||.||.
brightness.
6.0)
by
removing
switch.
changes
thru
8.8.8.
OR
LATER
the
Display
to
an
all 8 display.
to
==).
control
should
The
board
show
correct
If
from
-1-
VR4
point
the
is
is
page
15
6.0
6.1
PERFORMANCE
INTRODUCTION
This
procedure
humidifiers
servicing
(see
Appendix
Performance
Appendix
The
Performance
For
the
Initially
test.
The
second
heater
For
the
and a probe
its
entire
While
supply
through
without
involving
can
A2.
Static
Test,
the
heater
part
plate
will
Dynamic
assembly.
length
testing
the
but
the
the
chamber
B).
chamber
CHECK
may
be
used
dismantling
the
printed
be
monitored
test
consists
the
humidifier
plate
of
the
Static
be
at
maximum
Test,
the
The
to
the
top
Heated
inlet
and
to
check
circuit
during
of
will
get
Test
humidifier
delivery
of
the
Wire
models,
must
up
the
the
operation
the
unit.
This
boards, and
the
test
by
two
main
parts,
is
first
run
with
warm,
but
should
checks
the
over
temperature.
with a chamber
tube
should
chamber.
the
chamber
be
unobstructed.
delivery
tube
by
and calibration
performance
annually
using
the
fixed
be
as
the
functions
Static
Test
inputs
relatively
temperature
is
fitted
be
supported
does
not
The
purpose
convection.
of
the
check
should
part
of
the
of
and
the
to
check
cold
at
protection.
with a Heater
from
above
require
of
to
this
MR730/720/700/480
be
performed
routine
maintenance
the
Engineering
Dynamic
for
the
be
set-up
correct
end
of
At
the
Wire
so
that
filled
with
is
to
Test.
heater
the
first
end
of
delivery
it
drops
water
establish
after
any
procedure
Menu.
this
plate
part
test
tube
See
control.
of
this
the
assembly
vertically
or
have a gas
an
air
over
flow
6.2
6.2.1
6.2.2
The
MR730/720
model
MR480
PERFORMANCE
Ensure
See
NOTE:
EQUIPMENT
2)
3)
4) A humidification
STATIC
Connect
humidifier
2)
section
1)
34.5
Delivery
Dual
1)
Plugina34.5
Tum
the
Please
°C
TEST
the
is
to
be
is
tested
CHECK
MR730/720/700
6.4
for
testing
ensure
that
REQUIRED
Test
probe,
hose
and
probe
assembly.
chamber
SEQUENCE
Heater
Wire
or
the
delivery
degree
the
Temperature
heater
tested
in
the
Heater
slightly
differently.
MR730/720/700
model
has a suitable
of
MR480.
the
procedures
available
in
MR700
wire
assembly
without
scroll.
(MR730/720/700)
cable
to
the
humidifier.
tube
to
the
humidification
test
probe.
Control
knob
to
Wire
See
are
followed
series
(1.1
33.0
on
mode
section
Heater
correctly
calibration
to
1.3
metre
(Not
an
MR390.)
Do
not
chamber
+ 0.2
degree
(green
6.4.
Wire
at
module
to
kit
Adult).
this
stage
outlet.
and
LED
on).
connected.
avoid
(F & P
connect
Chamber
The
non
misleading
part
no.
900MR548).
the
probe
Control
Heated
test
assembly
to
0.
Wire
results.
to
the
3)
Turn
on
the
4)
Check
the
initialisation.
5)
Check
display
6)
Push
Chamber
MR730/720/700/480
humidifier
mains
Temperature
reading
temp.
of
button
Technical
power
Control
34.5 + 0.2
and
and
Chamber
after
check
Manual
switch.
Control
initialisation
for
34.5 + 0.2
#
setting
and
that
degree
reading.
Revision D #
by
noting
the
Issued
Set
display
Low
warning
October
readings
during
light
1995
is
on.
7)
8)
9)
10)
11)
12)
13)
14)
15)
Run
for
After
30
Heater
Heater
Turn
the
Turn
the
Turn
on
Check
Run
for
After
30
Heater
Heater
Tum
off
30
minutes
minutes
plate
Wire
humidifier
Check:
cold.
cold
(feel).
Less
temperature
the
mains
power.
temperature
30
minutes
minutes
plate
Wire
the
control
Check:
hot ( Greater
hot
(feel).
humidifier.
without
than
main
power
control
knob
without
than
page
interruption.
60
°C
switch
knob
setting
If
(hP
engineering
off.
to
36.0 + 0.2
during
interruption.
80
°C
).
16
mains
power
is
menu).
°C
and
leave
initialisation.
interrupted
Chamber
test
Control
will
set
have
at 0.
to
be
restarted.
6.2.3
DYNAMIC
1)
Remove
the
2)
Connect
3)
Turn
4)
Turn
Note:
the
breathing
5)
Check
6)
After % hour
7)
Continue
TEST
SEQUENCE
the
34.5
empty
chamber
the
Heater
Set
control
on
mains
At
low
ambient
test
will
warm
circuit
after
10
check
to
run
Airway
In
temperature
‘Engineering
set
offset=
Ede
Cde
hp
and
there
are
(MR730/7
°C
Test
(any
no
Wire
to
36.0+
power
and
temperatures
up
only
will
eventually
minutes
that
chamber
for 3 hours,
36.0 + 0.3°C
Mode’
=
36+0.1°C
0
=>
0
=>
0
=
>36°C
no
spurious
probe
scroll
cable
0.1°C
check
slowly
digital
outlet
then
(see
alarms.
20/700)
and
connect
chamber
and
probe
and
Chamber
settings
(below
and
may
warm
and
display
temperature
check
the
appendix
the
vertically
other
than
assembly
Control
during
initialisation.
22
°C)
the
give a low
the
humidifier
is
36.0 + 0.3°C
is
36.0 + 2.0°C
following:
A2):
supported
an
MR390)
to
the
humidifier.
to
0.
Heater
Wire
temperature
will
start
delivery
on
the
humidifier.
under
the
low
alarm.
If
this
controlling.
tube
flow
is
to
the
conditions
muted
outlet
of
the
of
8)
9)
10)
11)
Rotate
MR720
Rotate
Rotate
Check
temperature
set
to
temperature
the
chamber
Heater
control
40
degrees).
control
Wire
wire
knob
knob
control
to
plug
to
38
and
to
34
and
-2.5
and
check
disconnect
gives
check
check
that
audio
for
for
the
an
Airway
an
Airway
set
low
alarm
Temperature
Temperature
light
comes
and
Heater
on.
Wire
Low
High
alarm
alarm.
alarm.
light.
(For
12)
Push
alarm
13)
Disconnect
alarm.
14)
Push
15)
Unit
the
Heater
light.
the
Mute
is
now
Wire
the
temperature
button
ready
for
switch
and
probe
and
check
service.
check
and
alarm
page
17
that
Heater
check
the
Temperature
silencing.
Wire
off
gives
Probe
Audio
LED
alarm
and
flashes
and
Heater
gives
an
Wire
audio
6.3
6.3.1
6.3.2
PERFORMANCE
The
test
consists
For
the
Static
Initially
second
plate
For
delivery
NOTE:
EQUIPMENT
1)
2)
3)
4)
STATIC
1)
2)
the
heater
part
of
will
be
the
Dynamic
tube
Please
REQUIRED
34.5
°C
Anon
heated
Dual
temperature
An
MR310
TEST
Pluginthe
Turn
the
CHECK
of
two
main
Test
the
humidifier
plate
will
the
Static
Test
at
maximum
Test,
the
assembly
ensure
Test
and a probe
that
probe.
delivery
probe
humidification
PROCEDURE
34.5
degree
temperature
(MR480)
parts:
the
Static
is
first
get
very
hot
checks
the
temperature.
humidifier
with a full
assembly.
the
procedures
circuit
(1.1
to
assembly
such
chamber
(MR480)
test
probe.
contro!
knob
to
Test
run
with
but
should
over
temperature
chamber
The
are
followed
1.3
metre
as
900MR560.
or
similar
33.0 + 0.2
and
the
fixed
inputs
be
cool
delivery
correctly
Adult).
scrolled
degree.
Dynamic
at
protection.
(use
tube
reusable
to
check
the
only
should
to
Test.
end
MR310
avoid
chamber.
for
correct
of
the
first
At
the
end
chambers)
be
supported
misleading
heater
plate
part
of
this
of
this test
is
fitted
vertically.
results.
control.
test.
the
heater
with
The
a
3)
Turn
4)
Check
5)
Check
6)
Push
7)
Run
8)
After 1 hour
9)
Turn
10)
Turn
control
11)
Check
12)
Run
on
the
humidifier
that
33.0 + 0.2
display
Chamber
for 1 hour
check
Set = 33
hp = <70
off
the
humidifier
the
temperature
is
adjusted).
temperature
for 1 hour
flashes
reading
Temp.
button
without
the
control
control
without
main
power
switch.
on
the
display
of
34.5
after
initialisation
and
check
interruption.
engineering
knob
knob
If
menu
to
setting
interruption.
during
for
34.5
mains
power
(Appendix
36.0 + 0.2
during
initialisation.
initialisation.
(+
0.2).
degree
reading
is
interrupted
A2):
degree (check
(+
0.2).
test
will
correct
setting
have
to
is
displayed
be
restarted.
when
the
MR730/720/700/480
Technical
Manual * Revision D Issued
October
1995
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