Em-tec DIGIFLOW Ultrasonic Flow Measuring Board User Manual
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DIGIFLOW
the
OEM Ultrasonic Flow Measuring Board
- User Manual -
All rights reserved, Copyright © em- tec 2003
DIGIFLOW – User Manual
1. Contents
1. Contents ..................................................................................................................... 2
2. Safety Instructions ...................................................................................................... 3
3. Symbols and Abbreviations ....................................................................................... 5
4. Theory of Measurement ............................................................................................. 6
5. Specifications of the DIGIFLOW Board ................................................................... 7
5.1 Dimensions and Pin Assignments....................................................................... 7
5.2 Description of the Interfaces............................................................................... 8
5.3 Technical Data of the DIGIFLOW Board........................................................... 9
6. Specifications of the Clamp-on Transducer............................................................. 10
6.1 Technical Data and Range of Transducer......................................................... 10
7. Installation of the DIGIFLOW Board and Transducer ............................................ 11
7.1 Environmental Requirements............................................................................ 11
7.2 Installation of the DIGIFLOW Board ............................................................... 12
7.3 Mounting of the Transducer.............................................................................. 14
7.4 Troubleshooting ................................................................................................ 15
8. Order and Service Procedures.................................................................................. 17
Note: All information in this document is subject to change without notice. Names and data used in the examples are fictitious. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of em-tec GmbH.
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DIGIFLOW – User Manual
2. Safety Instructions
Read this User Manual carefully before you start the installation!
Terms and Definitions
DIGIFLOW
Transducer
OEM ultrasonic transit-time flow measuring board which must be used in combination with a Transducer.
Device to transmit and receive ult rasound signals which will be analysed by the DIGIFLOW board.
Main Unit / User
Host system into which the DIGIFLOW was integrated by
System
the customer.
Customer / User Person or company who uses the DIGIFLOW as OEM part in combination with their own system.
Indication
The DIGIFLOW is indicated to measure the liquid volume flow in flexible plastic tubes. It was especially designed for the integration into different user systems.
For this reason the intended use will be depend ent on the user application of the main unit. The environmental parameters and technical specifications, which must be strictly adhered to, are described on following pages.
Contraindication
The DIGIFLOW is only constructed and sold for the above mentioned purposes.
Medical applications:
In case that the DIGIFLOW shall be integrated in a medical system the user has to observe the following instructions.
The DIGIFLOW was designed to monitor the function of the equipment which generate the flow (e. g. oxygenator/pump ), but NOT to monitor vital patient parameters like a patient monitor. This unit shall NOT be intended for use as the sole basis for diagnosis without confirmation by another established medical procedure. Should the unit be used to control the liquid volume flow, the user has to analyse the risk of the application and if necessary, do flow board independent actions to minimize this risk.
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DIGIFLOW – User Manual
Liabilities and Responsibilities
The user is responsible to use, check and maintain the DIGIFLOW according to this user manual. Furthermore he is liable and responsible for updating approvals and reviewing the technical file of the main unit in which the DIGIFLOW was included. em-tec is not liable or responsible for any consequences arising out of use of the
DIGIFLOW which is not compare with the instructions or specifications of this manual.
General Safety Instructions
The DGIFLOW was developed and manufactured according to the newest technologies and production procedures (state-of-the-art).
Before installation the user has to read this manual carefully to prevent hazards and injury for the user or damage to the user system in case of improper use.
The service for the DIGIFLOW may be carried out by em-tec only. For this reason the malfunctioning systems must be shipped back to em-tec.
em-tec recommends that the system should be calibrated every 2 years.
Electrical Safety
The integration of the DIGIFLOW in the customer unit or the combination with other units must be realised according to IEC 60601 and further relevant national standards.
Use of an electrical cauterising knife
If you allow a cauterising knife to touch the measuring system or the extracorporeal tubes the flow display could be inaccurate.
Cleaning and Disinfection
After use of the DIGIFLOW system the Transducer should be cleaned, i.e. open the enclosure, remove the tube and eliminate splattered blood or gel from the housing with a lint- free cloth. Use only agents for cleaning and disinfection which have been tested and approved by your local Health Authority.
Work in a well- ventilated room. Pay attention that no agents ingress into the housing. Do not dip the whole Transducer into fluids!
Solvents
Chemical solvents like alcohol, aether, acetone etc. must not be used in or on any parts of the DIGIFLOW System. Do not spill anaesthetics on the unit or on any accessories. Chemicals like Foran (Isofluoran) could be very damaging for the system.
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DIGIFLOW – User Manual
3. Symbols and Abbreviations
Warning, must be observed strictly
Important instruction
Alternating current (AC)
IPX1
Type BF, Safety class according VDE 0750 Part1
IPX1, Protection against or from dripping water
Connection for potential equalisation
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DIGIFLOW – User Manual
4. Theory of Measurement
B
Transmitter/
Receiver
Flow a
Tube
Receiver/
Transmitter
A
The DIGIFLOW uses the ultrasonic transit-time method to measure volumetric flow through the tube. Liquid is flowing through the Transducer and carries with it the sound wave produced by the piezoceramic (A and B). The measurement is made twice; once upstream and once downstream. The transit time is determined in both cases and the difference is proportional to the volumetric flow. Other factors such as used tube size, ultrasonic frequency, fluid type, temperature and transducer characteristic s must considered for determination of the actual volumetric flow.
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DIGIFLOW – User Manual
5. Specifications of the DIGIFLOW Board
5.1 Dimensions and Pin Assignments
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DIGIFLOW – User Manual
5.2 Description of the Interfaces
Board Signal
J101-Pin 1 + 15V, ± 5%
J101-Pin 2 + 15V, ± 5%
J101-Pin 3 - 15V, ± 5%
J101-Pin 4 - 15V, ± 5%
J101-Pin 5 + 5V, ± 2,5%
J101-Pin 6 + 5V, ± 2,5%
J101-Pin 7 + 5V, ± 2,5%
J101-Pin 8 GND
J101-Pin 9 GND
J101-Pin 10 GND
J101-Pin 11 GND
J101-Pin 12 TxD *
J101-Pin 13 RxD *
J101-Pin 14 SPI-IN
J101-Pin 15 SPI-OUT
J101-Pin 16 SPI-SCLK
J101-Pin 17
/RESET
J101-Pin 18
J101-Pin 19
J101-Pin 20
Option
R_TRIGGER **
CAN_HI
CAN_LO
Description
Description
Operating voltage, supply current of 130 mA is required
Operating voltage, supply current of 80 mA is required
Operating voltage, supply current of 800 mA is required
Ground connection
Transmitter serial data output from serial port
Receiver serial data input
SPI-interface input
SPI-interface output
SPI-interface clock input
Input signal to restart the DIGIFLOW board (low active, TTL level)
Input signal to define the measurement period of the flow measurement (positive edge sensitive)
CAN 2.0B interface high line
CAN 2.0B interface low line
*
*
**
For switching to the RS232 level close JMP19 Pin 2-3 and JMP20 Pin 2-3
For switching to the TTL level close JMP19 Pin 1-2 and JMP20 Pin 1-2
To enable the R_TRIGGER input close JMP21 Pin 2-3
Settings of the serial communication port
Baud rate:
Data bits:
Stop bits:
Parity:
38400 Baud
8
1 none
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DIGIFLOW – User Manual
5.3 Technical Data of the DIGIFLOW Board
Principle of measurement:
Board size:
Total height: ultrasonic transit-time method
114,2 x 95,2mm about 40mm (incl. space bolts and supply cables)
Connection to the Transducer: enclosed cable set
Connection to the main system: AMP MICROMATCH Male, 20 pole
Power requirements (DC):
Interfaces:
Max. scan rate:
ADC sampling rate:
Transmitter frequency range:
+ 5V, ± 2,5%, 800mA
+ 15V, ± 5%, 130mA 6 Watts
- 15V, ± 5%, 80mA
- RS232 (CAN and SPI on request)
- R-Trigger (TTL Input)
1000 Hz
36 MHz
15 kHz to 18 MHz, different patterns possible, resolution 8 bit yes Zero flow offset adjustment:
Flow range:
Flow resolution:
Flow accuracy:
0 to 9.99 LPM
0.01 LPM
0.0 to 1.0 LPM: ± 0.1 LPM + offset drift
1.1 to 9.99 LPM: ±7 % of actual value + offset drift max. 0.05 LPM Flow offset drift:
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DIGIFLOW – User Manual
6. Specifications of the Clamp-on Transducer
6.1 Technical Data and Range of Transducer
Transducer Type Tube Size
COT-012-332A
COT-038-332A
COT-014-116A
1/2” x 3/32”
3/8” x 3/32”
1/4” x 1/16”
Protection class (IP code):
Material of the housing:
Type of probes:
Cable:
Connector:
Tube material:
Medium inside the tube:
Flow Range
20 lpm
15 lpm
8 lpm
Dimension
W x H x D
60 x 28 x 41
54 x 25 x 38
52 x 20 x 35
IPX1 - protected against dripping water aluminium
Z-Type (X-Type on request)
5 x 2 wires, 0,05mm², shielded twisted pair, 2 m
15 pole High Density D-SUB
PVC, silicon (other materials on request) water, blood (other mediums on request)
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DIGIFLOW – User Manual
7. Installation of the DIGIFLOW Board and Transducer
The DIGIFLOW system consists of electrostatic sensitive devices.
Handle only at static safe work stations according to IEC 61340-5-2!
7.1 Environmental Requirements
Temperature limits:
Operating:
Transportation:
Storage:
Relative humidity:
Operating:
Transportation:
Storage:
Atmospheric pressure:
Operating:
Transportation:
Storage:
17°C to 45°C
–18°C to 55°C
–18°C to 45°C
30 % to 75 % non-condensing
10 % to 96 % non-condensing
10 % to 96 % non-condensing
87 to 106 kPa
70 to 106 kPa
70 to 106 kPa
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DIGIFLOW – User Manual
7.2 Installation of the DIGIFLOW Board
Install the DIGIFLOW board according to IEC 60601 and further
relevant national standards!
The board must be fixed inside the main unit by 4 screws (recommended 2,5 mm in diameter) in combination with plastic space bolts (recommended 10 mm).
Ensure that the board is fitted without any tension.
All environmental conditions must meet the prescribed specifications (see chapter 7.1).
The connection between the DIGIFLOW board and the Transducer was realised by a cable set which was enclosed the shipment. The included HD SUB-D jack should be mounted on the housing of the main unit (use the enclosed screws). Should it be necessary to shorten the cable use the pin assignment which was listed on page 7.
After the mechanical installation connect the prescribed supply voltages and signals to the J101 on board AMP MICROMATCH male.
Attention! A short circuit resulting from an incorrect assignment of the wires will damage the DIGIFLOW system.
If the DIGIFLOW board was successful installed a start up message will be transmitted via the serial data communication port to the main unit. Status information such as the following will be edited by using a TVI925 terminal emulation.
DIGIFlow FlowMeter
--------------------
Software Revision: V1.00 Build from: Sep 22 2003 13:51:31
Serial No: DigiFlow 01
SELFTEST
IRAM internal check: PASSED
External WDT check: PASSED
Flash ROM on chip check: PASSED XPER/XRAM on chip check: PASSED
CAN1_RAM on chip check: PASSED CAN2_RAM on chip check: PASSED
EEPROM check: PASSED
Offset Check[mV]: 0 (0 mV) +5V Check[mV]: 596 (4768 mV)
+-15V Check[mV]: 1023 (4092 mV)
Temperature check: 426 PASSED
Self-Test PASSED
Press 'esc'-Key for Service Menue!
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DIGIFLOW – User Manual
After showing the results of the initial self test the DIGIFLOW board transmits a data string such as the following via the serial communication port to the main unit:
Parameter 1
String
00
2 3 4 5 6 7 8 9
08 +1592 +1590 +113 +0 +1254 +454
The data string consists of the following parameters separated by blanks:
Parameter 1: error byte (hex) of the DIGIFLOW board (see troubleshooting, too)
Parameter 2: status information (hex) of the flow measurement board DIGIFLOW
Bit 7: Sensor 1 connected
Bit 6: currently unused
Bit 5: Signal amplitude below 39%
Bit 4: currently unused
Bit 3: PVC tube detected
Bit 2: Silicone tube detected
Bit 1: flow values not ok or amplitude below 49%
Bit 0: temperature of flow board to high (> 65 °C)
Parameter 3: mean flow value integrated over 1 second in ml/min
Parameter 4: actual flow value in ml/min
Parameter 5: signal amplitude of the acoustic receiving signal in %
(100% is set to signal amplitude of 2.66 V)
Parameter 6: additional information for calibration purposes (only for service)
Parameter 7: measured transition time in picoseconds
Parameter 8: integrated flow value from R-Trigger to R-Trigger signal (if enabled by jumper setting) or integrated flow value over 10 seconds
Parameter 9: board temperature in 0.1 °C
The data string will be finished by a carriage return (0x0d) and a line feed (0x0a) character.
Temperature Control Function
The board temperature will be checked by the µController continuously (parameter 9 of data string). A temperature above 65°C will be set in the status byte. The temperature alarm flag in the status byte will be cleared if the board temperature decreases below
60°C. Should the board temperature further increase above 75°C a temperature error will be set in the error byte (see chapter “Troubleshooting”).
The temperature control function should be implemented for control purpose only.
Independent thereof has to be enough cooling inside the housing in which the
DIGIFLOW will be built in (< 45°C).
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DIGIFLOW – User Manual
7.3 Mounting of the Transducer
Select the Transducer according to the used tube size and connect it to the installed
DIGIFLOW board via the 15 pin High Density D-SUB jack. If the unit is running properly the included EEPROM will be readable and the DIGIFLOW board will receive the stored Transducer data automatically. If you should have problems, please see also the chapter „Troubleshooting“.
Before you start the measuring, you have to clamp-on the Transducer to the tube according to the following instructions.
Press the tube in the housing and close the Transducer.
The arrow which you can see on the enclosure should be in flow direction, so you will get positive flow values.
Pay attention that the tube is not damaged or deformed on the position where you want to clamp on the Transducer. The tube should also be straight (unbent) for reaching laminar flows and exact measuring values.
In case that you do not attain enough ultrasound coupling the tube must be greased by coupling gel before you clamp-on the transducer.
Use the original coupling gel (Order No: 10385) only! We do not guarantee sufficient ultrasound coupling for a longer measurement time if you should use other gels.
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DIGIFLOW – User Manual
7.4 Troubleshooting
During the start up and normal operation of the DIGIFLOW several self tests are running.
The result of these tests will be transmitted via the serial communication port to the main unit. In case that a test fails an error code will be stored in the transmitted error byte.
Additionally, an error indication will be displayed by the OK-LED which is located on the top side of the board (see page 7). If the unit is running properly the LED is on. In case of error detection the LED will be switched off.
Example of a failed self test:
DIGIFlow FlowMeter
--------------------
Software Revision: V1.00 Build from: Sep 22 2003 13:51:31
Serial No: DigiFlow 01
SELFTEST
IRAM internal check: PASSED
External WDT check: PASSED
Flash ROM on chip check: PASSED XPER/XRAM on chip check: PASSED
CAN1_RAM on chip check: PASSED CAN2_RAM on chip check: PASSED
EEPROM check: FAILED
Offset Check[mV]: 0 (0 mV) +5V Check[mV]: 596 (4768 mV)
+-15V Check[mV]: 1023 (4092 mV)
Temperature check: 426 PASSED
Self-Test FAILED
A data string with error indication is following:
19 2A +1087 +1090 +113 +0 +1089 +0 +0
Parameter1 (error byte) = 0x19 à EEPROM test error
Further error indications are described on the following page.
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DIGIFLOW – User Manual
0x18
0x19
0x1A
0x1B
0x1C
0x21
0x22
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
Description of the Error Byte:
0x00
0x01
0x02 no error
FLASH error at test STP0
FLASH error at test STP1
0x03
0x04
0x05
0x06
0x07
0x08
0x0A
0x0B
0x0C
0x0D
FLASH error at test STP2
FLASH error at test STP3
FLASH error at test STP4
FLASH error at test STP5
RAM error at test STP0
RAM error at test STP1
RAM error at test STP2
RAM error at test STP3
RAM error at test STP4
RAM error at test STP5
Watch Dog Timer defect error in task handling error during JMP-Check internal ADC error (status STP0) internal ADC error (status STP1) internal ADC error (status STP2) internal ADC error (status STP3) internal ADC error (status STP4) internal ADC error (status STP5) internal ADC offset error
+5V test error
EEPROM test error
Board temperature error (> 75°C)
+15V check error
-15V test error
EEPROM CRC error
Calibration factor inconsistent
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DIGIFLOW – User Manual
8. Order and Service Procedures
DIGIFLOW
DIGIFLOW Board including Cable Set and User Manual
Accessories
Transducer (COT-012-332A), tube size:1/2" x 3/32"
Transducer (COT-038-332A), tube size:3/8" x 3/32"
Transducer (COT-014-116A), tube size:1/4" x 1/16"
Ultrasound Coupling Gel
Order No: 11088
Order No: 11056
Order No: 11048
Order No: 11032
Order No: 10385
Please contact our sales department if you want order the DIGIFLOW system or accessories. Do not hesitate to get in touch with our salesmen if you should have any questions.
em-tec GmbH
Sales Department
Lerchenberg 20
D 86923 Finning
Germany
Tel.: ++49 8806 9236-0
Fax: ++49 8806 9236-50
Mail [email protected]
In case that a unit seems to be malfunctioning, please inform our service department before you send it to em-tec. Our support engineers will help you solve the problem.
Please use the original package if you send back the malfunctioning system to em-tec.
Enclose the shipment a detailed description of the failure. Name and phone number or email address of the person who is able to give further information would be helpful.
em-tec GmbH
Service Department
Lerchenberg 20
D 86923 Finning
Germany
Tel.: ++49 8806 9236-0
Fax: ++49 8806 9236-50
Mail [email protected]
You can get general information about new products and updates on our web page: www.em-tec.de
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