GE Healthcare
Datex-Ohmeda S5 Monitor Series
S5 Pressure Temp Module Technical Reference Manual Slot June 2001
Technical Reference Manual
42 Pages
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Datex-Ohmeda Pressure Modules S/5TM Pressure Temp Module, M-PT (Rev. 02) S/5TM Pressure Module, M-P (Rev. 04) Technical Reference Manual Slot
All specifications are subject to change without notice. Document No. 800 1013-1 June 2001
Datex-Ohmeda Inc. 3030 Ohmeda Drive 53707–7550 MADISON, WIS USA Tel. +1-608-221 1551, Fax +1-608-222 9147 www.us.datex-ohmeda.com
Datex-Ohmeda Division, Instrumentarium Corp. P.O. Box 900, FIN-00031 DATEX-OHMEDA, FINLAND Tel. +358 10 394 11 Fax +358 9 146 3310 www.datex-ohmeda.com Instrumentarium Corp. All rights reserved.
Table of contents
TABLE OF CONTENTS Pressure Module, M-P, Pressure Temp Module, M-PT TABLE OF CONTENTS
i
TABLE OF FIGURES
ii
Introduction
1
1
2
Specifications
1.1 General specifications ...2 1.2 Typical performance ...2 1.2.1 InvBP...2 1.2.2 Temperature...2 1.2.3 Signal output ...2 1.3 Technical specifications...3 1.3.1 InvBP...3 1.3.2 Temperature...3 1.3.3 Signal output ...3
2
Functional Description
4
2.1 Measurement principle ...4 2.1.1 Invasive blood pressure ...4 2.1.2 Temperature...4 2.2 Main components...4 2.2.1 PT board ...6 2.3 Connectors and signals...10 2.3.1 Module bus connector ...10 2.3.2 Front panel connectors ...11 2.3.3 Other connectors...11
3
Service Procedures
13
3.1 General service information...13 3.2 Service check ...13 3.2.1 Recommended tools ...13 3.3 Disassembly and reassembly...18 3.4 Adjustments and calibrations...19 3.4.1 Invasive pressure calibration...19 3.4.2 Temperature calibration...19
4
Troubleshooting
21
4.1 Troubleshooting chart ...21 4.1.1 Invasive blood pressure ...21 4.1.2 Temperature...22 Troubleshooting flowchart ...23
5
Service Menu
24
5.1 P/PT menu ...25 5.2 P/PT calibration menu ...26
6
Spare Parts
28 i Document No. 800 1013-1
Datex-Ohmeda S/5 monitors 6.1 Spare parts list ...28 6.1.1 Pressure Module, M-P, Rev. 00...28 6.1.2 Pressure Module, M-P, Rev. 01...29 6.1.3 Pressure Module, M-P, Rev. 02...29 6.1.4 Pressure Module, M-P, Rev. 03...29 6.1.5 Pressure Module, M-P, Rev. 04...29 6.1.6 Pressure Temp Module, M-PT, Rev. 00 ...30 6.1.7 Pressure Temp Module, M-PT, Rev. 01 ...31 6.1.8 Pressure Temp Module, M-PT, Rev. 02 ...31 6.1.9 Front panel stickers for AS/3 modules (square buttons) ...31 6.1.10 Front panel stickers for S/5 modules (round buttons) ...31
7
Earlier Revisions
33
APPENDIX A
35
Service check form
A-1
TABLE OF FIGURES Figure 1
Datex-Ohmeda M-PT and M-P Module... 1
Figure 2
Front panel of M-P and M-PT Module... 5
Figure 3
PT board block diagram ... 6
Figure 4
Pressure transducer principle of operation... 7
Figure 5
Temperature measurement principle... 8
Figure 6
Serial communication and opto isolation section... 8
Figure 7
Module bus connector (X1) ...10
Figure 8
Troubleshooting flowchart...23
ii Document No. 8001013-1
Pressure Module, M-P and Pressure Temp Module, M-PT
INTRODUCTION This section provides information for the maintenance and service of the Pressure Module, M-P, and Pressure Temp Module, M-PT. The M-P and M-PT modules are single width plug-in modules designed for use with the S/5 monitors. Both modules provide invasive pressure measurement. Additionally, the M-PT-module provides temperature measurement. The M-PT module also has a connector for direct ECG and pressure signal output. NOTE: Do not use identical modules in the same monitoring system. The modules M-P and M-PT are considered as identical modules.
Figure 1
Datex-Ohmeda M-PT and M-P Module
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1
SPECIFICATIONS
1.1 General specifications Module size, W × D × H Module weight Power consumption
37 × 180 × 112 mm / 1.5 × 7.1 × 4.4 in 0.35 kg / 0.8 lbs Approximately 3.5 W
1.2 Typical performance 1.2.1 InvBP Measurement range Accuracy Zero adjustment range Calibration range Scales Sweep speed
-40...+320 mmHg ±5 % or ±2 mmHg, whichever is greater ±150 mmHg ±20 % Upper limit is adjustable between 10 and 300 mmHg in steps of 10. Lower limit is 10 % of selected upper limit below zero. 12.5, 25, 50 mm/s
DIGITAL DISPLAY Range Resolution
-40...+320 mmHg ±1 mmHg
WAVEFORM DISPLAY Range
-30...+300 mmHg
HEART RATE FROM ARTERIAL PRESSURE Measurement range 30...250 bpm Resolution 1 bpm Accuracy ±5 bpm or ±5 %, whichever is greater
1.2.2 Temperature Measurement range Display resolution Temperature test
10...45 °C (50...113 °F) 0.1 °C (0.1 °F) Automatic (every 10 min.)
YSI 400 probe compatible
1.2.3 Signal output ECG out Pressure P3 out
2 Document No. 8001013-1
1 V/mV 1 V/100 mmHg, (0...300 mmHg)
Pressure Module, M-P and Pressure Temp Module, M-PT
1.3 Technical specifications 1.3.1 InvBP Accuracy Transducer and input sensitivity Nonlinearity Filter Zero set accuracy Calibration resolution Zero time
±5 % or ±2 mmHg, whichever is greater 5 µV/V/mmHg, 5 VDC, 20 mA max current <1 %, 0 to 200 mmHg <2 %, -40 to 0 and 200 to 320 mmHg 0...4 - 22 Hz adjustable ±1 mmHg ±1 mmHg less than 15 sec
Protection against electrical shock
Type CF defibrillation proof
DIGITAL DISPLAY AVERAGING Art and P1 digital displays are averaged over 5 seconds and updated at 5 seconds intervals. All other pressures have respiration artifact rejection. NOTE: The accuracy of the measurement may be different from that specified, depending on the transducer/probe being used. Please check the transducer/probe specification.
1.3.2 Temperature Measurement accuracy
±0.1 °C (25.0...45.0 °C) ±0.2 °C (10.0...24.9 °C)
Protection against electrical shock
Type CF
NOTE: The accuracy of the measurement may be different from the specified, depending on transducer/probe used. Please check the transducer/probe specification.
1.3.3 Signal output Max. delay: Pressure offset error
ECG1 15 ms Pressure P3 25 ms (0...300 mmHg) max. 10 mmHg
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2
FUNCTIONAL DESCRIPTION
2.1 Measurement principle 2.1.1 Invasive blood pressure To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive pressure setup, consisting of connecting tubing, pressure transducer, an intravenous bag of normal saline all connected together by stopcocks, is attached to the catheter. The transducer is placed at the same level with the heart, and is electrically zeroed. The transducer is a piezo-resistive device that converts the pressure signal to a voltage. The monitor interprets the voltage signal so that pressure data and pressure waveforms can be displayed.
2.1.2 Temperature The temperature is measured by a probe whose resistance varies when the temperature changes, called Negative Temperature Coefficient (NTC) resistor. The resistance can be measured by two complementary methods: • •
Applying a constant voltage across the resistor and measuring the current that flows through it. Applying a constant current to flow through the resistor and measuring the voltage that is generated across it.
In S/5 module the two methods are combined in a form of a voltage divider. The NTC-resistor is connected in series with a normal resistor and a constant voltage is applied across them. The temperature dependent voltage can be detected at the junction of the resistors, thus producing the temperature signal from the patient. The signal is amplified by analog amplifiers and further processed by digital electronics.
2.2 Main components The M-PT module consists of the following main parts: •
PT board
•
Two connectors for YSI 400 series temperature probes; temperature channels T3 and T4.
•
Nicolay-type connector for an invasive blood pressure sensor; invasive blood pressure channel P3.
•
Key for pressure zeroing.
•
DIN-type connector for two direct ECG output signals and pressure 3.
NOTE: These output-signals are non-floating The M-P module consists of the following main parts: • PT board • Nicolay-type connector for an invasive blood pressure sensor; invasive blood pressure channel P3. 4 Document No. 8001013-1
Pressure Module, M-P and Pressure Temp Module, M-PT Key for pressure zeroing.
•
Communication between the module and the central unit is established through RS485 serial interface. The power supply voltages to the module are generated in the power supply section of the monitor’s Central Unit. All electrical connections between the module and the Central Unit are established via 25-pin D-type connector on the backside of the module.
Zero P3
Zero P3 T3
P3
T4 Signal Out
P3
Figure 2
Front panel of M-P and M-PT Module
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2.2.1 PT board Module bus connector, D25
RS485 driver for data
RS485 driver for module reset
Power-up reset
Power, non-isolated section
ECG OUT PRESSURE OUT to output connector
Opto Isolation
Patient Isolation
Microprocessor section
non-volatile memory
Power, isolated section
A/D converter
INV.pressure measuring
Figure 3
Isolation transformer
unit
Temperature measuring unit
to pressure sensor
to temperature sensors
Keyboard
PT board block diagram
ECG and pressure signal prosessing The PT-module has the Signal Out connector, for output of analog ECG and pressure signals. The analog ECG-output signals are made by detecting the pulse-width modulated (PWM) ECG signal of the module bus. The module detects the presence of the pacemaker pulses by following the ECG module. Every time the pacer pulse has been detected, the microprocessor of the M-PT module generates a 2.5 ms pacer pulse which is added to the analog ECG signal. The PRESSURE OUT signal is generated from the P3 invasive pressure signal of the M-PT module. 6 Document No. 8001013-1
Pressure Module, M-P and Pressure Temp Module, M-PT The P3 signal is transmitted as a pulse width modulated (PWM) signal over the patient isolation. The analog signal is generated by low-pass filtering the PWM signal.
Microprocessor unit The microprocessor uses the Intel 80C196KC-16 which includes three A/D converters and a UART. There are external memories, an 8-bit data bus, a 16 MHz oscillator, an open collector reset, and a watchdog timer. The internal UART communicates and transfers data between the module and the CPU board in the monitor. High speed I/O is used to obtain pulse control sequence necessary for pulse oximetry measurement. It receives its timing clock from the oscillator.
Invasive blood pressure measurement unit An isolated +5 V supply is connected to the input of the pressure transducer bridge circuit. From the bridge circuit output a differential voltage, which depends on blood pressure and input supply voltage, is calculated using the following formula: Uout = Uin × Pressure × 5 V where Uin = 5 V Uout = 25 V × Pressure [mmHg] Pressure amplification is performed by the instrumentation amplifier. The gain of the amplifier is set so that the level of the signal transferred to the A/D converter stays within the measurement range even when there are circumstantial offsets or offsets caused by the pressure transducer. The input filter before the amplifier attenuates high frequency disturbances. Pressure transducer
Vin
Instrumentation amplifier Vout
Input Filter
G to AD converter
Figure 4
Pressure transducer principle of operation
Temperature measurement unit Value of NTC-resistor in the probe depends on patient’s temperature. It is measured with the following principle. The temperature signal(s) is produced by voltage dividers, part of which is the patient probe (YSI 400-series thermistor). The output is amplified by the calibrated amplifier(s) whose offset voltage makes its output spread on both sides of zero. Wider output range (measurement range) means better resolution. 7 Document No. 800 1013-1
Datex-Ohmeda S/5 monitors
0 °C => 7K357 15 °C => 3K541 25 °C => 2K253 38 °C => 1K301 45 °C => 984R1
+5Vreference
A1 to AD converter
NTC offset
Figure 5
Temperature measurement principle
Serial communication
Send data
Receive data Send data send/receive Reset
Figure 6
RS485 Driver NData
Opto isolation
send/receive
Reset
RS485 Driver
Reset in NReset in
to central unit (module bus)
Data
Receive data
Patient Isolation
to module prosessor
Serial communication between the module and the Central Unit is done by RS485 type bus whose buffers get their supply voltage (+5 VDC) from the Central Unit and in the isolation section get the supply voltage (+5 V) from the isolated power supply. The communication drivers are controlled by a reset signal such that when the reset is active the drivers do not transfer data. Reset is also RS485 type and additionally, there is an auxiliary logic power reset, which keeps the reset active for about 500 ms despite the state of reset in the module bus. A time constant determines the power-up reset time. There are components to prevent the module from sending data during reset. The data transmission rate is 500 kbps.
Serial communication and opto isolation section
Isolated section There are two opto isolators, one for data and one for the reset signal. Signals are processed on logical high-low levels even though the output of the opto isolators in the isolation section are analog signals.
8 Document No. 8001013-1
Pressure Module, M-P and Pressure Temp Module, M-PT The reset line is an open collector type with a pull-up resistor so that the microprocessor is able to use its internal watchdog function.
Power supply section Isolated supply voltage of the module is developed from +15 Vdirty voltage from the Central Unit. Power supply is a switched-mode circuit, where FET transistor switch is controlled by an oscillator using bipolar timer. The frequency of the oscillator is about 30 kHz and pulse ratio 50 %. Controlling of the FET switch is slowed to suppress spurious interference. A special pulse transformer is used in the circuit. The transformer secondary circuit uses normal linear regulators except for +5 V which uses a low drop type linear regulator.
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2.3 Connectors and signals 2.3.1 Module bus connector
1
13 25
14
Figure 7
Module bus connector (X1)
Pin No
I/O
Signal
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
I I I I I/O I/O
RESET_RS485* -15 VDC* +15 VDIRTY* +15 Vin* NDATA_RS485* DATA_RS485* Ground* NRESET_RS485* CTSB RTSB RXDB TXDB Ground* +32 VDIRTY GroundDIRTY* CTSC RTSC RXDC TXDC ON/STANDBY PWM_ECG* RXDD_RS232 TXDD_RS232 +5 VDCin* +5 VDC*
I I O I O I I I O I O O
I I
* Used in the M-PT module
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Pressure Module, M-P and Pressure Temp Module, M-PT
2.3.2 Front panel connectors Pressure connector (P3) 3 6 1 2
4
7
5
8
9
0
Pin No
Signal
1
Pressure 3 +
2
Pressure 3 -
3
Polarization - (ground)
4
Polarization +
5
Not connected
6
Not connected
7
Not connected
8
Not connected
9
Ground
10
Cable detection
Signal out connector (Sync. out) Pin No 2 1
3 4
Signal
1
ECG out, 1 V/ 1 mV
2
Pressure out, 1 V/ 100 mmHg
3
ECG out, 1 V/ 1 mV
4
Ground
NOTE: The ECG out signal is not available with modules M-ESTP rev. 01, M-EST rev. 00 and M-ETP rev. 00.
2.3.3 Other connectors Keyboard connector (X3) Pin No
Signal
Notes
1
N/C
Not connected
2
COSWITCH
Not used
3
PSWITCH
for zeroing of P3
4
fGND
Floating GND
5
fGND
Floating GND
X3 1
5
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Pressure sensor connector (X4) Pin No board
Pin No fr.panel
Signal
Notes
1
0
PCABEL
5V if cable not connected
2
4
PCURRENT
Pulsed supply to sensor
3
3,9
P3-
Signal from the sensor
4
1
P3+
Signal from the sensor
5
2
fGND
Floating GND
X4 1
5
When the board is used in the M-PT module, there are the following connectors connected on the board in addition to X1 and X4.
Signal out connector (X5) Pin No board
Pin No fr.panel
Signal
Notes
1
-
ECG OUT
ECG to (e.g.) IABP
2
-
N/C
Not connected
3
4
GND
+5VDCin GND
4
1
ECG OUT
ECG to (e.g.) defib.
5
-
N/C
Not connected
6
3
ECG OUT
ECG to (e.g.) IABP
7
2
P OUT
P3 to (e.g.) IABP
8
GND
GND
+5VDCin GND
X5 1
8
Connector for temperature probes (X8) Pin No
Signal
Notes
1
T3
-
2
T4
-
3
fGND
Floating GND
4
CON
Low if PT
5
fGND
Floating GND
6
GND
Floating GND
12 Document No. 8001013-1
X8 1
6
Pressure Module, M-P and Pressure Temp Module, M-PT
3
SERVICE PROCEDURES
3.1 General service information Field service of the M-P and M-PT modules 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 appropriate equipment should perform the tests and repairs outlined in this section. Unauthorized service may void warranty of the unit.
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 list 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.
M-NE(12)STPR/M-ESTPR/M-ESTP
Notes Not M-ESTP Rev. 01, M-EST Rev. 00 or M-ETP Rev. 00
Patient simulator Pressure manometer Temperature test set
884515
InvBP transducer Oscilloscope Screwdriver
13 Document No. 800 1013-1
Datex-Ohmeda S/5 monitors
All modules •
Detach the module box by removing the two screws from the back of the module. Be careful with the loose latch and spring locking pin.
1.
Check internal parts: •
screws are tightened properly
•
cables are connected properly
•
all socket mounted IC’s are inserted properly
•
EMC covers are attached properly
•
there are no loose objects inside the module
? 2.
Check external parts: •
the front cover and the front panel sticker are intact
•
all connectors are intact and are attached properly
•
the module box, latch and spring locking pin are intact
? • •
Reattach the module box and check that the latch is moving properly. Switch the monitor on and wait until the monitoring screen appears. Configure the monitor screen so that all the needed parameters are shown, for example as follows:
Monitor Setup - Screen 1 Setup - Waveform Fields - Field 1 - ECG1
Digit Fields
Field 2 - P1 Field 3 - P3 Field 4 - P5 Field 4 - T3+T4
3.
Plug in the module. Check that it goes in smoothly and locks up properly.
•
Preset InvBP measurement settings:
?
Invasive Pressures - P1 ‘Art’ Setup - Label - Art P3 Setup - Label – PA
14 Document No. 8001013-1
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4.
Enter the service menu:
Monitor Setup - Install/Service (password 16-4-34) - Service - (password 26-23-8) Take down the information regarding module software by selecting SCROLL VERS and turning the ComWheel.
?
5.
Enter the P/PT service menu (according to the tested module): Parameters - P/PT 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 module memories have passed the internal memory test, i.e. the “RAM”, “ROM” and “EEPROM” show all OK.
?
Invasive blood pressure measurement 6.
Check the front panel membrane key. Press the key at least for one second. Check that the pressed key is identified, i.e. the text for “Button” changes from OFF to ON in the service menu.
?
7.
Check that the “Cable” and “Probe” show OFF. Plug a cable with an invasive blood pressure transducer into the front panel connector P3. Check that the “Cable” and “Probe” show ON and the pressure
8.
waveform field appears onto the monitor screen.. NOTE: Test both invasive blood pressure channels with M-PP.
?
9.
Calibrate the InvBP channel according to the instructions in the Technical Reference Manual.
?
10.
Check that the module configuration is correct with P and PT modules. The configuration in use is shown beside the text “Configuration” in the service menu and it can be either BP or PT. Change the configuration in the CALIBRATIONS -menu, if necessary.
?
11.
Check the InvBP channels with a patient simulator 15 Document No. 800 1013-1
Datex-Ohmeda S/5 monitors The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are: SENSITIVITY switch position: 5 µV/V/mmHg ECG - BASE - BPM - 60 ATM
BP - 2 - WAVE -
connect a cable from the channel BP3 to the connector P3. Ccheck that appropriate InvBP waveform is shown and the InvBP value is approximately 25/10 (±2 mmHg).
? Modules with temperature measurement 11. Check that the “Cable” and “Probe” show OFF for the channels T3 and T4 when no probes are connected. Connect a temperature test plug into the connector T3. Check that the “Cable” and “Probe” for T3 show ON and the corresponding temperature value appears onto the screen. Perform the same check also for the channel T4.
?
12. Check the temperature calibrations using temperature test plugs. If the deviation on a temperature reading on the screen is more then 0.1 °C, calibrate the temperature channels according to the instructions in the Technical Reference Manual.
?
13. Activate the temperature test by selecting TEMP TEST from the menu and pressing the ComWheel twice. When the message “Performing temp test” disappears from the digit field for T3+T4, check that no error messages appear and “Temp error” shows OFF for both channels in the menu.
?
16 Document No. 8001013-1
Pressure Module, M-P and Pressure Temp Module, M-PT
Modules with signal output connector •
Preset InvBP and ECG measurement settings:
Invasive Pressures - P3 Setup - Label - Art ECG - ECG1 LEAD -I Connect a patient simulator to the connector P3 and to the connector ECG on the used M-NE(12)STPR/M-ESTPR/M-ESTP. The settings and checks with a Dynatech Nevada medSim 300 Patient Simulator are: SENSITIVITY switch position: 5 µV/V/mmHg BP - 1 - WAVE - ART ECG - BASE - BPM - 160 PACE - WAVE - NSR Use the channel BP1 for the connector P3. 14. Connect an oscilloscope between the signal out connector pins 1 (ECG out) and 4 (Ground).
2 1
3 4
Check that an analog signal which corresponds with the ECG waveform on the screen comes out. The output signal’s ratio to the actual ECG signal should be around 1V/1mV. Check that a similar output signal is coming out also from the pin 3 (ECG out).
? 15.
Connect the oscilloscope between the signal out connector pins 2 (Pressure out) and 4 (Ground). Check that an analog signal which corresponds with the InvBP waveform on the screen comes out. The output signal’s ratio to the actual InvBP signal should be around 1V/100mmHg.
?
17 Document No. 800 1013-1