SFM3400 Datasheet by Sensirion AG

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Datasheet SFM3400-AW
Preliminary Datasheet SFM3400-D
Digital Flow Meter for Neonatal/Pediatric Medical Applications
Flow range: ± 33slm (bidirectional)
Small dead space < 1ml
Re-use (-AW) version
Preliminary single-use (-D) version
Very fast update time (0.5ms)
Product Summary
The SFM3400 sensor series is Sensirion’s digital flow meter
designed for neonatal/pediatric medical applications. It
measures the flow rate of air, oxygen and other non-
aggressive gases with superb accuracy. The special design
of the flow channel results in a very small dead space.
The SFM3400-AW is designed for multiple use with the
ability to withstand autoclave procedures. The single-use
version SFM3400-D is in development stage with preliminary
specifications identical to SFM3400-AW. Therefore, the
SFM3400 series is extremely well suited for proximal flow
measurements in neonatal/pediatric medical ventilation and
other respiratory applications.
The SFM3400 series has been designed with the use by
medical professionals in mind. It features medical cones
for pneumatic connection to standard breathing circuits and
a mechanical interface for easy and reliable electrical
reconnection. The sensor element, signal processing and
digital calibration are on a single microchip assuring very
fast signal processing time, best-in-class accuracy and
superior robustness to rough handling and adverse
conditions.
The well-proven and patented CMOSens® sensor
technology is perfectly suited for high-quality mass
production and is the ideal choice for demanding and cost-
sensitive OEM applications.
Applications
Proximal flow measurement for infants / neonates
Expiratory flow measurement for infants /
neonates
Ventilation & Anesthesia for infants / neonates
Respiratory measurements for infants / neonates
Metabolic Measurements for infants / neonates
OEM options
A variety of custom options can be implemented for high-
volume OEM applications (custom flow rates, calibration for
other gases, different body form factor, disposable option
etc.). Contact us for more information.
Sensor chip
The SFM3400 flow meter features a fifth-generation silicon
sensor chip. In addition to a thermal mass flow sensor
element, the chip contains an amplifier, A/D converter,
EEPROM memory, digital signal processing circuitry, and
interface. Due to seamless integration of signal acquisition
and processing on the single silicon die significant
performance and cost benefits are achieved.
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1.1 Physical Specifications
1
Parameter
Condition
Value
Unit
Flow Range
-33 … +33
slm 2
Typical
Accuracy 4
span <33 slm
offset
±3 5
± 0.02 5
% m.v.7
slm 2
Noise Level 4, 8
span <33slm
offset
0.5% 9
0.005 9
% m.v 7
slm 2
Accuracy shift for deviation from
reference temperature 2C
span
offset
% m.v./ 10˚C
slm / 10°C
Resolution (14bit)
span
offset
0.06 9
0.005 9
% m.v. 7
slm 2
Pressure Drop
@ 5 slm
@ 10 slm
@ 25 slm
100 / 0.4 9
250 / 1.0 9
900 / 3.6 9
Pa / inH2O
Pa / inH2O
Pa / inH2O
1.2 Ambient conditions
Parameter
Condition
Value
Unit
Calibrated Temperature Range
dry gas
+10 … +50
°C
Operating Temperature Range
10-95% rel. hum. (non cond.)
+5 … +50
°C
Storage Temperature
10-95% rel. hum. (non cond.)
-40 … +70
°C
Shelf Life for SFM3400-D
15°C - 35°C; 30 - 70 % rel. hum.
storage in original packaging
3
years
Operating Pressure Range
absolute
0.54 1.1
bar
Burst Overpressure
gauge
0.3
bar
1.3 Media compatibility
Parameter
Value
Calibration 10
Air
Media Compatibility
Air (non-condensing), N2, O2, other non- aggressive gases
Wetted Materials -AW
Si, Si3N4, SiOx, gold, PPSU, silicone
Wetted Materials -D
Si, Si3N4, SiOx, gold, MABS, silicone, epoxy
RoHS, REACH
RoHS and REACH compliant
1
Reference conditions are temperature = 25°C, absolute pressure = 966 mbar, horizontal flow and Vdd = 5V
2
slm: mass flow measured in liters per minute at standard conditions (T = 20 °C, p = 1013.25 mbar)
3
For "Max" no sensor measured outside of this limit will be shipped and a CpK of 1.33 is targeted
4
For accuracy, noise level or resolution the total value is the sum of the offset and span values
5
This value corresponds to a CpK of 0.67 (95% of sensors within the “Typical” limit)
6
Dependent on tracheal tube diameter
7
% m.v. = % measured value = % of reading
8
Noise level defined as standard deviation of individual sensor readings, measured at full sampling rate
9
Average value
10
Contact Sensirion for information about other gases, wider calibrated temperature ranges and higher storage temperatures
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2. Electrical Specifications
2.1 Electrical Characteristics
Electrical properties
Condition
Value
Unit
Interface
I2C
Default Sensor Address
64 (h40)
Update Time
14 bit
0.5
ms
Soft Reset Time
80
ms
Start-up Time11
Max.
100
ms
Supply Voltage
5V±5%
V
Communication Level
High
Low
Min.
Max.
V
2.5
GND
VDD
1.1
Power Consumption12
< 50
mW
Electrical Connector
See section 2.2 and 3.2
External Heater Power Rating
Max.
0.5
W
External Heater Resistance
Typ.
51
Output Signal Resolution13
14
bit
Scale Factor Flow
Air, N2
800
1/slm
Offset Flow
32768
2.2 Pad Layout
2.3 Conversion to Physical Values
In order to obtain the measured flow in [slm], the measured
value needs to be converted using the following formula:
𝑓𝑙𝑜𝑤 [slm] = 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑣𝑎𝑙𝑢𝑒 − 𝑜𝑓𝑓𝑠𝑒𝑡 𝑓𝑙𝑜𝑤
𝑠𝑐𝑎𝑙𝑒 𝑓𝑎𝑐𝑡𝑜𝑟 𝑓𝑙𝑜𝑤
Please note that the first measurement performed directly
after chip initialization is not valid.
11
After 4.75V is reached
12
When the heater resistor on the PCB is not in operation
13
16 bit with two least significant bits always zero
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3. Mechanical Specifications
All dimensions are in millimeters (mm).
3.1 Mechanical fitting
Fittings of the SFM3400 sensor correspond to the
international standard ISO5356-1:2004. Details about this
type of connection can be found in the description of the
standard.
3.2 Mechanical / Electrical Interface
SFM3400 series has been designed for use in an expiratory
environment. Therefore, the sensor has been designed for
a connector that can be easily connected and disconnected.
The connector itself is not provided as a standard product
by Sensirion but Sensirion can help with an application note
including design recommendations.
Dimension
Condition
Value
Length
60 mm (typical)
Diameter flow channel
center of sensor
3.5 mm (typical)
Medical connector, distal side
ISO 5356-1
Cone, 15 mm
Medical connector, proximal side
ISO 5356-1
Socket, 15 mm
Dead space
relevant section
0.9 ml (typical)
Weight
without connector
7.5 g (typical)
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4. Instructions for Use
4.1 Calibration orientation
The sensors are calibrated horizontally as depicted in the
following graph:
Positive flow direction is from the male 15 mm cone to the
female 15 mm medical cone, so that inspiratory flows are
positive and expiratory flows negative.
4.2 Inlet flow conditions
In order to provide good flow conditions, the inner diameter
of the connecting tube has to be approximately the same as
the inner diameter of the SFM3400 main flow channel.
4.3 Temperature compensation
The SFM3400-AW sensor features digital temperature
compensation. The temperature is measured on the
CMOSens® chip by an on-chip temperature sensor. This
data is fed to a compensation circuit that is also integrated
on the CMOSens® sensor chip. Thus, no external
temperature compensation is necessary.
4.4 Cleaning (applies only to SFM3400-AW
version)
The SFM3400-AW has been designed to withstand medical
cleaning procedures. For details of the test and the results
contact Sensirion.
Sensirion AG does not guarantee the stability of the flow
sensor using arbitrary methods and/or equipment for
autoclaving. Validation of the flow sensor stability for a
specific type of procedure and/or equipment is the sole
responsibility of the customer.
4.5 ESD
The electronics of the SFM3x00-AW flow sensor chip has
been tested for ESD and passed an 8kV contact test. For
ESD information about the additional EEPROM (type:
24LC01BT-I/MC) please consult the datasheet of the
EEPROM.
4.6 Sensor handling
The SFM3400 sensor is designed to be robust and shock
resistant. Nevertheless, the accuracy of the high-precision
SFM3400 can be degraded by rough handling. Sensirion
does not guarantee proper operation in case of improper
handling.
Note: never connect the sensor while connecting part is wet.
Especially after cleaning procedure special care is needed
to dry the sensor.
Please be aware that SFM3400 has been designed for
usage with air and other non-corrosive and non-toxic gases.
If leak tightness is critical in customer application, it remains
customer’s sole responsibility to leak-test the sensor before
usage.
4.7 I2C Interface and communication
Due to I2C interface restrictions, the cable length from the
sensor to the microprocessor is recommended to be as
short as possible and certainly not above 30 cm. For wires
longer than 10 cm it is mandatory to shield the SDA and
SCL.
In case data is read from the sensor, the first data byte of
the transaction must always be acknowledged by the
master.
It must be possible to reset the sensor through a hard reset,
i.e. powering off and on the sensor, in case the sensor
freezes.
I2C Communication details are given in the application note
GF_AN_SFM3xxx_I2C Functional Description.
There is an additional EEPROM on the PCB to allow
storage of customer-specific data. Please see all details in
the datasheet of the EEPROM. The EEPROM is of type
24LC01BT-I/MC. No additional validation or modification of
EEPROM settings has been performed by Sensirion.
SFM3400-AW only:
There is an additional EEPROM on the SFM3400-AW to
allow storage of customer-specific data (like for example
usage hours). Please see all details in the datasheet of the
EEPROM. The EEPROM is of type 24LC01BT-I/MC. No
additional validation or modification of EEPROM settings
has been performed by Sensirion.
Positive flow direction
(also marked on the sensor body)
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5. Ordering Information
Use the part names and product numbers shown in the
table below when ordering SFM3400-AW sensors. For the
latest product information and local distributors, visit
www.sensirion.com.
Part name
Product
Number
Availability
SFM3400-33-AW
1-101545-01
Available
SFM3400-33-D
1-101607-01
Samples
Packaging units: 30 items/tray.
Every sensor is traceable by a unique serial number.
Revision history
Date
Author
Version
Changes
Jan 2016
ALAN
0.1
First preliminary version
September 2016
ALAN
0.2
Updates/Refinements; New Drawings
October 2016
ALAN
0.3
Refinements Pressure/Wetted Materials
December 2016
DAT
0.4
Include -D version
January 2017
ALAN
0.5
Updated formatting, product number, physical specifications
July 2017
SAW
1.0
Reworked footnotes of physical specification. Removed preliminary status for SFM3400-AW.
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Important Notices
Warning, personal injury
Do not use this product as safety or emergency stop devices or in
any other application where failure of the product could result in
personal injury (including death). Do not use this product for
applications other than its intended and authorized use. Before
installing, handling, using or servicing this product, please consult
the datasheet and application notes. Failure to comply with these
instructions could result in death or serious injury.
If the Buyer shall purchase or use SENSIRION products for any
unintended or unauthorized application, Buyer shall defend, indemnify
and hold harmless SENSIRION and its officers, employees, subsidiaries,
affiliates and distributors against all claims, costs, damages and
expenses, and reasonable attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such
unintended or unauthorized use, even if SENSIRION shall be allegedly
negligent with respect to the design or the manufacture of the product.
ESD Precautions
The inherent design of this component causes it to be sensitive to
electrostatic discharge (ESD). To prevent ESD-induced damage and/or
degradation, take customary and statutory ESD precautions when
handling this product.
Warranty
SENSIRION warrants solely to the original purchaser of this product for
a period of 12 months (one year) from the date of delivery that this
product shall be of the quality, material and workmanship defined in
SENSIRION’s published specifications of the product. Within such period,
if proven to be defective, SENSIRION shall repair and/or replace this
product, in SENSIRION’s discretion, free of charge to the Buyer,
provided that:
notice in writing describing the defects shall be given to SENSIRION
within fourteen (14) days after their appearance;
such defects shall be found, to SENSIRION’s reasonable
satisfaction, to have arisen from SENSIRION’s faulty design,
material, or workmanship;
the defective product shall be returned to SENSIRION’s factory at
the Buyer’s expense; and
the warranty period for any repaired or replaced product shall be
limited to the unexpired portion of the original period.
This warranty does not apply to any equipment which has not been
installed and used within the specifications recommended by
SENSIRION for the intended and proper use of the equipment. EXCEPT
FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN,
SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS OR
IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL
WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product arising under the
conditions of operation provided for in the datasheet and proper use of
the goods. SENSIRION explicitly disclaims all warranties, express or
implied, for any period during which the goods are operated or stored not
in accordance with the technical specifications.
SENSIRION does not assume any liability arising out of any application
or use of any product or circuit and specifically disclaims any and all
liability, including without limitation consequential or incidental damages.
All operating parameters, including without limitation recommended
parameters, must be validated for each customer’s applications by
customer’s technical experts. Recommended parameters can and do
vary in different applications.
SENSIRION reserves the right, without further notice, (i) to change the
product specifications and/or the information in this document and (ii) to
improve reliability, functions and design of this product.
Copyright © 2001-2015, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
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SENSIRION AG
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Switzerland
phone: +41 44 306 40 00
fax: +41 44 306 40 30
info@sensirion.com
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phone: +1 805 409 4900
info_us@sensirion.com
www.sensirion.com
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phone: +81 3 3444 4940
info@sensirion.co.jp
www.sensirion.co.jp
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phone: +82 31 345 0031 3
info@sensirion.co.kr
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phone: +86 755 8252 1501
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phone: +41 44 927 11 66
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