Datex-Ohmeda S/5 M-NIBP Use and care manual

Datex-Ohmeda
S/5TM NIBP Module, M-NIBP (Rev. 05)
Technical Reference Manual Slot
All specifications are subject to change without notice.
Document No. 800 1015-1
June 2001
Datex-Ohmeda Inc.
3030 Ohmeda Drive
53707-7550 MADISON, WIS
USA
Tel. [phone], Fax. [phone]
www.us.datex-ohmeda.com
Datex-Ohmeda Division,
Instrumentarium Corp.
P.O. Box 900, FIN-00031
DATEX-OHMEDA, FINLAND
Tel. [phone] Fax [phone]
www.datex-ohmeda.com
Instrumentarium Corp. All rights reserved.

Table of contents
Document No. 8001015-1
i
TABLE OF CONTENTS
NIBP Module, M-NIBP
TABLE OF CONTENTS i
TABLE OF FIGURES ii
Introduction 1
1 Specifications 2
1.1 General specifications ..............................................................................................................................2
1.2 Typical performance .................................................................................................................................2
1.3 Technical specifications............................................................................................................................2
2 Functional Description 4
2.1 Measurement principle .............................................................................................................................4
2.2 Main components.....................................................................................................................................4
2.2.1 NIBP board ......................................................................................................................................5
2.3 Connectors and signals.............................................................................................................................7
2.3.1 Module bus connector......................................................................................................................7
2.3.2 Test points .......................................................................................................................................8
3 Service Procedures 9
3.1 General service information.......................................................................................................................9
3.2 Service check .........................................................................................................................................10
3.2.1 Recommended tools ......................................................................................................................10
3.2.2 Recommended parts ......................................................................................................................10
3.3 Disassembly and reassembly..................................................................................................................16
3.4 Adjustments and calibrations..................................................................................................................17
3.4.1 Pressure safety level detection “OFFSET”.........................................................................................17
3.4.2 NIBP calibrations............................................................................................................................17
4 Troubleshooting 19
4.1 Troubleshooting chart .............................................................................................................................19
4.2 NIBP error code explanation ....................................................................................................................21
4.3 Troubleshooting flowchart .......................................................................................................................22
5ServiceMenu 23
5.1 NIBP Service menu .................................................................................................................................24
5.1.1 NIBP Demo menu...........................................................................................................................25
5.1.2 NIBP Calibration menu ...................................................................................................................26
5.1.3 NIBP Safety Valve menu .................................................................................................................27
5.1.4 NIBP Pulse Valve menu...................................................................................................................28
5.1.5 NIBP Buttons/Leds menu ...............................................................................................................29
5.1.6 NIBP Pneumatics menu ..................................................................................................................30
5.1.7 NIBP Watchdog menu.....................................................................................................................31
6 Spare Parts 33
6.1 Spare parts list .......................................................................................................................................33
6.1.1 NIBP Module, M-NIBP Rev. 01 ........................................................................................................33
6.1.2 NIBP Module, M-NIBP Rev. 02 ........................................................................................................35

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6.1.3 NIBP Module, M-NIBP Rev. 03........................................................................................................35
6.1.4 NIBP Module, M-NIBP Rev. 04........................................................................................................36
6.1.5 NIBP Module, M-NIBP Rev. 05........................................................................................................37
6.1.6 Front panel stickers for AS/3 modules (square buttons)...................................................................37
6.1.7 Front panel stickers for S/5 modules (round buttons).......................................................................38
7 Earlier Revisions 39
APPENDIX A 41
Service check form A-1
TABLE OF FIGURES
Figure 1 Non-invasive blood pressure Module, M-NIBP ....................................................................................... 1
Figure 2 Front panel of NIBP Module .................................................................................................................. 4
Figure 3 NIBP board functional block diagram .................................................................................................... 5
Figure 4 NIBP Module troubleshooting flowchart...............................................................................................22

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INTRODUCTION
This section provides information for the maintenance and service of the Non-Invasive Blood
Pressure parameter module, M-NIBP. The Non-Invasive Blood Pressure Module, M-NIBP, is a
double width plug-in module designed for use with the S/5 monitors.
Figure 1 Non-invasive blood pressure Module, M-NIBP
NOTE: Do not use identical modules in the same monitor simultaneously. The M-NIBP and M-
NE(12)STPR/-NESTR/-NETPR/M-MRI/M-MRIP are considered as identical modules.

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1SPECIFICATIONS
1.1 General specifications
Module size, W ×D ×H 75 ×180 ×112 mm/3.0 ×7.1 ×4.4 in
Module weight 0.7 kg/1.5 lbs
Power consumption about 4 W
1.2 Typical performance
Oscillometric measurement principle.
Measurement range adult 25...260 mmHg
child 25...195 mmHg
infant 15...145 mmHg
Accepted HR 30...250 bpm
Measurement interval from continuous to 1h, 2h, 4h
Measurement time, typical adult 23 s
infant 20 s
Initial inflation pressure adult 185 ±10 mmHg
child 150 ±10 mmHg
infant 120 ±10 mmHg
Venous stasis adult 80 ±10 mmHg / 2 min
child 60 ±10 mmHg / 2 min
infant 40 ±10 mmHg / 1 min
Cuff widths Please see User’s Guide
1.3 Technical specifications
Deflation rate, HR dep. 5...13 mmHg/sec
Inflation rate, typical 20...185 mmHg, 1...5 s
Automatic software control, max. inflation pressure
adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 150 ±10 mmHg
Over pressure limit, stops measurement after 2 seconds
adult 320 mmHg
child 220 mmHg
infant 165 mmHg
Safety valve limits the maximum cuff pressure to 320 mmHg in adult/child mode or 165 mmHg in
infant mode. Independent timing circuit limits pressurizing (>5 mmHg) time to 2 minutes 10
seconds maximum in adult/child mode, and 1 minute 5 seconds in infant mode.
Zeroing to ambient pressure is done automatically.

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Inflation pressure is adjusted according to the previous systolic pressure, typically 40 mmHg
above. If the systolic pressure is not found, inflation pressure is increased typically 50 mmHg.
Max. measurement time adult 2 min.
child 2 min.
infant 1 min.
Pressure transducer accuracy is better than ±3 mmHg or ±2 % (whichever is greater). Max. error ±4
mmHg.
Protection against electrical shock Type BF defibrillation proof

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2FUNCTIONAL DESCRIPTION
2.1 Measurement principle
NIBP (Non-Invasive Blood Pressure) is an indirect method for measuring blood pressure.
The NIBP measurement is performed according to the oscillometric measuring principle. The cuff is
inflated with a pressure slightly higher than the presumed systolic pressure, and deflated at a
speed based on the patient’s pulse, collecting data from the oscillations caused by the pulsating
artery. Based on these oscillations, values for systolic, mean, and diastolic pressures are
calculated.
The following parts are necessary for NIBP measurement:
•NIBP module
•Twin hose (adult or infant model)
•Blood pressure cuffs (different sizes)
2.2 Main components
The NIBP module consists the following parts:
•NIBP board
•Pneumatics and hosing
•NIBP air pump
•Zero valve
•Check valve
•Bleed valve
•Exhaust valves (2)
•Pressure transducers (2)
•Module keyboard and status indicator LEDs
•Front panel keys: Auto On/Off, Set Cycle Time, Stat On/Off, Start/Cancel
Auto
On/Off
Set
Cycle
Time
STAT
On/Off
NIBP
Auto
Manual
STAT
Measuring
Start
Cancel
Figure 2 Front panel of NIBP Module

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2.2.1 NIBP board
ADDRESS
DECODER
POWER-UP
RESET
CPU
80C51FA
RS485
INTERF.
ADDRESS
LATCH
RAM
INTERNAL
WATCHDOG
EEPROM
(Calib-
ration
Data)
AD-CON-
VERTER
Write protect switch
EPROM
FRONT
PANEL
KEYS
SOFT-
WARE
CONTROL
DATABUS
ADDRESS BUS
WATCHDOG
TIMER
X1
JOINING
CHAMBER
CUFF
M
EXHAUST VALVE 1
BLEED VALVE
CHECK VALVE PUMP
EXHAUST
VALVE 2
PRESSURE
TRANS-
DUCERS
PUMP and
VALVE
DRIVER
OVERPRESSURE CONTROL
ZERO
VALVE
B1 B2
+15VD
to/frommodulebus
Figure 3 NIBP board functional block diagram
Pressure transducers
The NIBP board contains two pressure transducers. They are of piezoresistive type. One is used for
measuring the pressure of the blood pressure cuff and the pressure fluctuations caused by arterial
wall movement (B1). The other is used for detection of cuff hose type, cuff loose and cuff occlusion
situations etc. (B2). The transducers are internally temperature compensated. They are supplied by
a constant voltage and their output voltage changes up to 40 mV max. (50 kPa, 375 mmHg).
Signal processing
Two signals from the pressure transducers are amplified and sent to A/D converter. After the
converter, digitized signals are sent to microprocessor for data processing. Before the converter,
one of the signals is used to adjust the offset to the pressure safety level.
The NIBP board is controlled with 80C51FA microprocessor at 16 MHz oscillator frequency.
Communication between the module and the monitor CPU board is established through RS485
serial interface at 500 kbps data transfer rate.

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Memory
NIBP program memory (EPROM) size is 128k ×8. RAM size is 32k ×8 bit and it stores variable
values in NIBP measurement. EEPROM is size 64 ×16 bit and is used to store the calibration
values for the pressure transducers, the pulse valve constants gained during measurements, the
PC board identification, and module serial number.
Software control
Software controls valves and pump. In addition to the individual on/off signals for each component
there is a common power switch for the valves and the pump that can be used at pump/valve
failures.
In addition to external RS485 reset line the microprocessor system is equipped with its own power-
up reset.
Watchdog timer
The NIBP board is equipped with software independent safety circuit to disconnect supply voltages
from the pump and the valves if the cuff has been pressurized longer than preset time. As soon as
the cuff pressure rises over a specified pressure limit, timer starts counting. The timer is adjusted to
stop the pump and open the valves in 2 minutes 10 seconds in adult/child mode and in 1 minute
5 seconds in infant mode.
Valves
Exhaust valves are used for emptying the cuff and the joining chamber after the measurement.
Exhaust valve 1 is also used as safety valve in infant mode. Valve opens at 165 mmHg. Exhaust
valve 2 is also used as safety valve in adult mode and opens at 320 mmHg.
Bleed valve is used for emptying the cuff during measurement. Zero valve is used for connecting
the pressure transducer B1 to open air.
Power supply section
All connections are established via 25-pin connector (D-type, female). The module needs +5 V,
±15 V, and +15 VD (dirty) power supply to operate. The pump and the valves use separate +15 VD
power line. The supply voltages are generated in the power supply section of the S/5 monitor. The
reference voltages ±5 Vref and +10 Vref are generated on the NIBP board.

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2.3 Connectors and signals
2.3.1 Module bus connector
13
1
14
25
Module Bus connector (X1)
Pin No I/O Signal Not used
1 I RESET_RS485
2 I -15 VDC
3 I +15 VDIRTY
4 I +15 VDC
5 I/O -DATA_RS485
6 I/O DATA_RS485
7 - Ground & Shield
8 I -RESET_RS485
9 I CTSB *
10 O RTSB *
11 I RXDB *
12 O TXDB *
13 - Ground & Shield
14 I +32 VDIRTY *
15 I GroundDIRTY
16 I CTSC *
17 O RTSC *
18 I RXDC *
19 O TXDC *
20 - ON/STANDBY *
21 - PWM_ECG *
22 - RXDD_RS232 *
23 - TXDD_RS232 *
24 I +5 VDC
25 I +5 VDC
*Not used in the M-NIBP module

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2.3.2 Test points
NIBP board
There are test pad blocks on solder side.
X8 and X6 pads and voltages are:
X7
X8
X5
X6
X3
Pump
X8
1
2
9
10
X6
12
78
X8 X6
Pin No Signal Pin No Signal
1 GND 1 GND
2 WD out 2 A1 output
3 reset 3 - 5 V
4 +5 V 4 +5 V ref
5 +15 V dirty 5 B1 out - (A1 input)
6 +15 V 6 B1 out +
7 -15 V 7 B2 out +
8 - 8 B2 out -
9-
10 GND

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3SERVICE PROCEDURES
3.1 General service information
Field service of the M-NIBP module is limited to replacing faulty circuit boards or mechanical parts.
The circuit boards should be returned to Datex-Ohmeda for repair.
Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full
type designation, and a detailed description of the fault.
CAUTION Only trained personnel with the appropriate tools and equipment should perform
the tests and repairs outlined in this section. Unauthorized service may void
warranty of the unit.

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3.2 Service check
These instructions include complete procedures for a service check. The service check is
recommended to be performed after any service repair. However, the service check procedures can
also be used for determining possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (Appendix A) which should be filled in when performing the
procedures.
The mark ?in the instructions means that the check form should be signed after performing
the procedure.
The procedures are designed for monitors with S/5 monitor software of revision 01. However, most
of the procedures also apply to monitors, which contain some other monitor software
type/revision.
3.2.1 Recommended tools
Tool Order No. Notes
Pressure manometer
Adult cuff & hose
Infant cuff & hose
Screwdriver
3.2.2 Recommended parts
Part Order No. Notes
NIBP pump filter 57142
•Detach the module box by removing the two screws from the back of the module. Be careful
with loose latch and spring pin for locking.
1. Check internal parts:
−screws are tightened properly
−cables are connected properly
−all IC’s that are on sockets are attached properly
−EMC covers are attached properly
−the calibration protection switch on the NIBP board is intact
−tubes are not pinched and there are no sharp bends on them

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−tubes are connected properly
−the upper of the cuff connector tubes, as well as the related tube connector are
marked
−there are no loose objects inside the module
?
2. Check external parts:
−the front cover and the front panel sticker are intact
−the cuff connector is intact and is attached properly
−the module box, the latch and the spring pin are intact
?
3. Replace the NIBP pump filter, if necessary.
?
•Reattach the module box and check that the latch is moving properly.
•Switch the monitor on and wait until the monitoring screen appears.
•Make sure that NIBP information is selected to be shown on the screen:
Monitor Setup - Screen 1 Setup - Digit Fields - Field 2 - NIBP
4. Plug in the module. Check that it goes in smoothly and locks up properly
?
5. Check that the module is recognized, i.e. the NIBP headers appear on the selected digit
field.
?
6. Enter the service menu:
Monitor Setup - Install/Service (password 16-4-34) - Service (password 26-23-8)
Take down the information regarding NIBP module software by selecting Scroll Vers and
turning the ComWheel.
?

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7. Enter the NIBP module service menu:
Parameters - NIBP
Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values are not increasing
faster than by 50 per second. Check also that the NIBP board memories have passed the
internal memory test, i.e. the ‘RAM’, ‘ROM’ and ‘EEPROM’ show all OK.
?
8. Check the front panel LEDs and membrane keys.
Select Buttons/Leds
Highlight the text Auto ON. Check that the LED for the autocycle measurement is turning on
and off on the module front panel when pressing the ComWheel. Check also the other LEDs
by selecting Manual ON, STAT ON and Measur. ON.
Press each of the module’s membrane keys at least for one second. Check that the pressed
key is identified, i.e. the text OFF changes to ON for the key in the menu.
?
9. Check the pump and valves.
Select Pneumatics from the NIBP menu. Connect a pressure manometer to the NIBP
module cuff connector.
Highlight Start Pump and press the ComWheel. Check that the pump turns on and the
pressure inside the tubing system starts to increase. Stop the pump by pressing the
ComWheel again when the pressure reaches 280 mmHg.
Highlight Open Exh1. Press the ComWeel and check that the pressure inside the tubing
system starts to drop then press the ComWheel again. Check the other exhaust valve by the
same way by selecting Open Exh2 from the menu.
If necessary, turn the pump on again for a moment to increase the pressure inside the
tubing system.
Highlight Open Zerovalve. Press the ComWheel and check that the pressure B1 ≅0 mmHg.
Close the zero valve by pressing the ComWheel again and check that the pressure B1 is
equal with the pressure B2.
Highlight Set Valve. Press the ComWheel and set the value under the text ‘Pulse Valve’ to
number 150 by turning the ComWheel. Press the ComWheel again and check that the
pressure inside the tubing system starts to drop. Finish the test by selecting Previous Menu.
?

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10. Check the NIBP tubing system for leakages.
Select Calibrations from the NIBP service menu.
Keep the pressure manometer connected to the NIBP module cuff connector. Start the
active leak test from the menu by pressing the ComWheel. The module pumps a pressure of
about 265 mmHg and then the pump stops.
Wait for 15 seconds for the pressure to stabilize then check that the pressure does not drop
more than 5 mmHg per one minute. Release the pressure by pressing the ComWheel once
more.
?
11. Calibration check.
Disconnect the pressure manometer. Select Calibrations and then highlight Calibration
Check. Press the ComWheel and take down the zero offset values for both pressure
transducers, B1 and B2. The values should be within ±10 mmHg.
Connect the pressure manometer to the cuff connector and check the calibration with
pressures 100 mmHg, 200 mmHg and 260 mmHg. The zero offset value must be added to
the displayed pressure value in order to determine the real pressure.
Recalibrate the NIBP measurement according to the instructions in the Technical Reference
Manual, if necessary. Remember to set the calibration protection back on after the
calibration.
?
12. Check the watchdog timer activation pressure.
Select Pneumatics from the NIBP service menu.
Keep the pressure manometer connected to the cuff connector. Pump up the pressure very
slowly and note the value on the manometer when your hear a signal from the loudspeaker.
The pressure at where the watchdog timer should activate with an audible signal is
Rev. 00-03 = 14 mmHg (9...19 mmHg)
Rev. 04 -> = 7.5 mmHg (5...10 mmHg)
Adjust the limit with the trimmer on the NIBP board, if necessary.
?
13. Check the watchdog timer.
Select Watchdog from the NIBP service menu.
Check the watchdog timer in the adult mode. Activate the timer by highlighting Test ADULT
and then pressing the ComWheel. Check that the time beside the text ‘Watchdog Interval’
starts to run. Wait until you hear a signal from the loudspeaker and then check the time
again. The time from the adult test should fall within 120...140 seconds.

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Check the watchdog timer also in the infant mode by first selecting Test INFANT from the
menu. The time from the infant test should fall within 60...70 seconds.
?
14. Check the safety valve.
Select Safety Valve from the NIBP service menu.
Keep the pressure manometer connected to the cuff connector.
NOTE: Make sure your pressure manometer can be used to measure pressures over 300
mmHg. If such a pressure manometer is not available, perform the check with an adult cuff
that is connected around some round object, for example calibration gas bottle.
Highlight Start Test. Start the adult safety valve test by pressing the ComWheel. Wait until
the pump stops and the pressure is deflated. Check the pressure values ‘Max press’ and ‘2
s after stop’ for both transducers. All the values should be within 290...330 mmHg.
Highlight Adult. Press the ComWheel and check that the text changes now to Infant. Select
Start Test and wait until the pump stops and the pressure values on the screen have been
updated. Check that the values ‘Max press’ and ‘2 s after stop’ are all now within
154...165 mmHg.
Return to the normal monitoring mode by pressing Normal Screen.
?
15. Connect an adult NIBP cuff to the cuff connector and disconnect one of its hoses.
Start NIBP measurement by pressing the key Start/Cancel on the module and check that
the message ‘Cuff loose’ appears on the screen within 30 seconds.
Reconnect the hose and then bend it with your fingers. Restart the measurement and check
that the message ‘Cuff occlusion’ appears on the screen within 30 seconds.
?
16. Check that automatic inflation limits are in use:
NIBP - NIBP Setup - Inflation Limits - Auto - Previous Menu
Connect the cuff onto your arm, highlight Start Ven.Stasis in the NIBP menu and press the
ComWheel. Check the module identifies the cuff, i.e. the text ‘Adult’ appears into the NIBP
digit field for a short moment.
Keep the pressure inside the cuff for about half a minute in order to see that the cuff is not
leaking, then press the ComWheel again. Select Normal Screen.
?

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17. Keep the cuff on your arm and perform one NIBP measurement. Check that the module
gives a reasonable measuring result.
?
18. Connect an infant cuff to cuff connector and wrap it around your fingers.
Start NIBP measurement and check that the module identifies the cuff, i.e. the text ‘Infant’
appears into the NIBP digit field. Cancel the measurement after the cuff identification.
?
19. Perform electrical safety check and leakage current test.
?
20. Check that the module functions normally after the performed electrical safety check.
?
21. Clean the module with suitable detergent.
?
•Fill in all necessary documents.

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3.3 Disassembly and reassembly
Rev. 01-03 Disassemble the M-NIBP module in the following way. See the exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with loose
latch and spring pin for locking.
3. To detach the NIBP board remove the four corner screws from the back of NIBP board. The
NIBP board and the front panel can be detached.
4. To free the front panel and the NIBP board, disconnect tubes and connectors.
5. Remove the five screws and lift off the plastic pump cover. NIBP pump, safety (over
pressure) valve, and valve unit which includes two valves, wires and a connector will be
exposed. Remove them.
6. Pull out pulse valve from the bottom of the NIBP frame.
Rev. 04 -> Disassemble the M-NIBP module in the following way. See the exploded view of the module.
1. Remove the two screws from the back of the module.
2. Pull the module box slowly rearward and detach it from main body. Be careful with loose
latch and spring pin for locking.
3. To detach the NIBP board remove the support plate by 2 screws (item 25).
4. Remove the metal frame (item 26).
5. Detach the damping chamber with 3 screws.
6. Detach 2 screws (item 9).
7. To free the front panel and the NIBP board, disconnect tubes and connectors.
8. Remove the two screws and lift off the pump. NIBP pump, and valve unit which includes four
valves, wires and a connector will be exposed. Remove them.
CAUTION Before reattaching the module box, make sure that the tubes are not pinched
between the NIBP frame and the PC board.
NOTE: Take care that the connectors and especially the tubes are reconnected properly and to the
right ports.