Datex-Ohmeda S-5 Service Manual M-NIBP

S/5

Datex-Ohmeda

TM

NIBP Module, M-NIBP (Rev. 05)

Technical Reference Manual Slot

Datex-Ohmeda Inc.
3030 Ohmeda Drive
53707-7550 MADISON, WIS
USA
Tel. [phone], Fax. [phone]

www.us.datex-ohmeda.com

All specifications are subject to change without notice.

Document No. 800 1015-1

June 2001

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

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

5Service Menu 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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Datex-Ohmeda S/5 monitors

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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Document No. 800 1015-1

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.

NIBP Module, M-NIBP

Figure 1 Non-invasive blood pressure Module, M-NIBP

NOTE: Do not use identical modules in the same monitor simultaneously. The M-NIBP and M­NE(12)STPR/-NESTR/-NETPR/M-MRI/M-MRIP are considered as identical modules.

Document No. 800 1015-1

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Datex-Ohmeda S/5 monitors

1 SPECIFICATIONS

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

Accepted HR 30...250 bpm
Measurement interval from continuous to 1h, 2h, 4h
Measurement time, typical adult 23 s

child 25...195 mmHg
infant 15...145 mmHg

infant 20 s

Initial inflation pressure adult 185 ±10 mmHg

Venous stasis adult 80 ±10 mmHg / 2 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

Over pressure limit, stops measurement after 2 seconds

child 150 ±10 mmHg
infant 120 ±10 mmHg

child 60 ±10 mmHg / 2 min
infant 40 ±10 mmHg / 1 min

adult 280 ±10 mmHg
child 200 ±10 mmHg
infant 150 ±10 mmHg

adult 320 mmHg
child 220 mmHg
infant 165 mmHg

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Document No. 800 1015-1

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.

NIBP Module, M-NIBP

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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Datex-Ohmeda S/5 monitors

2 FUNCTIONAL 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

Measuring

NIBP

Auto

Manual

STAT

Auto
On/Off

Set
Cycle
Time

STAT
On/Off

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Start
Cancel

Figure 2 Front panel of NIBP Module

2.2.1 NIBP board

CUFF

ZERO
VALVE

EXHAUST
VALVE 2

JOIN ING
CHAMBER

EXHAUST VALVE 1

BLEED VALVE

CHECK VALVE

PUMP

NIBP Module, M-NIBP

PUMP and
VALVE

M

DRIVER

B1 B2

t
o

/
f
r
o

m
m

o
d
u
l

e
b

u
s

X1

PRESSURE

S

TRAN

-

D

UCERS

AD-CON­VERTER

POWER-UP

RESET

RS485
INTER F.

EEPRO
(C alib­ration
Data)

Figure 3 NIBP board functional block diagram

Pressure transducers

OVERPRESSURE CONTROL

M

Write protect switch

CPU
80C51FA

NTERNAL

I
WATCHDOG

ADDRESS
DECODER

ADDRESS
LATCH

ADDRESS BUS

WATCHDO G

TIMER

RAM

DATABUS

+

1

5

EPROM

D

V

FRONT
PANEL

KEYS

SOFT ­WAR E

CON TRO L

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 power­up 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 V

ref and +10 Vref are generated on the NIBP board.

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2.3 Connectors and signals

2.3.1 Module bus connector

NIBP Module, M-NIBP

13

25

1

14

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

2.3.2 Test points

NIBP board

There are test pad blocks on solder side.
X8 and X6 pads and voltages are:

Pump

X6

X8

X3

X5

X7

10

9

1

X8

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

X6

12

78

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NIBP Module, M-NIBP

3 SERVICE 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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Datex-Ohmeda S/5 monitors

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

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.

? in the instructions means that the check form should be signed after performing

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.

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Document No. 800 1015-1

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

− 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.

?

NIBP Module, M-NIBP

• 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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Document No. 800 1015-1