Datasheet SDP1000
Low Range Differential Pressure Sensor
for Air and Non-Aggressive Gases
− For HVAC and medical OEM applications
− Unsurpassed performance thanks to CMOSens® technology
− Offset and hysteresis free
− Excellent accuracy and reproducibility even below 10 Pa
− Fully calibrated and temperature compensated
− Linear or square root extracted output characteristics available
− Not sensitive to the mounting orientation
− Direct PCB mounting with simple snap-on system
Datasheet – v5.1
SDP1000 Product Summary
differential sensor transmitter with e.g. an 0...10 V output
or other interfaces.
Its leading performance is based on Sensirion’s
proprietary CMOSens® sensor technology which
combines the sensor element with amplification and A/D
conversion on one single silicon chip. The differential
pressure is measured by a thermal sensor element. In
contrast to other thermal differential pressure sensors
only a very small amount of air is required. This leads to
a reliable operation even under harsh conditions. In
comparison to membrane based sensors the SDP1000
differential pressure sensors show an extended
measurement range, better offset stability and improved
reproducibility even at lowest pressure ranges. In
addition, the SDP1000 is robust against pressure bursts
and shows no sensitivity to the mounting orientation.
Applications
Block Diagram
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Version 5.1 April 2017
DIGITAL
Linearization and
Temperature
compensation
A/D converter
Differential
pressure
Sensor
CMOSens®
SENSOR CHIP
D/A
converter
- Medical
- HVAC
- Automotive
- Process Automation
Memory
The SDP1000 differential pressure sensors for air cover
the following measurement ranges: –5 to 125 Pa (0.5
inch H2O), and -20 to 500 Pa (2 inch H2O).
Mounted in a rugged, chemically inert PPS housing the
SDP1000 differential pressure sensors feature a unique
dynamic range, zero offset and unsurpassed long term
stability. This makes it an ideal fit for demanding yet cost
sensitive OEM applications in HVAC and medical
equipment.
The devices are supplied with 5.0 V and provide a
0.25…4.0 V output. Although the output of the SDP1000
differential pressure sensor is analog, the internal
linearization and temperature compensation is
performed digitally. This results in a superior accuracy,
outstanding resolution, and lowest temperature
dependence.
Since fully exchangeable just a few external electronic
components around the SDP1000 make a high quality
VDD
5.0 V
GND
OUT
0.25 V
to 4 V
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Datasheet SDP1000 Series
1
Specifications
Table 1: Sensor specifications (at 23°C and pabsolute = 966mbar, VDD = 5.0 V unless otherwise noted).
SDP1000-L025
Parameter
Min
Measurement range
Power supply
Typ
Max
Min
-62
62
-0.25
4.75
(see Tab 4)
SDP1000-L05
5.00
Typ
SDP1000-L
Max
Min
-5
125
- 20
500
Pa
0.25
-0.02
0.5
-0.08
2
Inch water
5.25
4.75
5.25
4.75
5.25
V
5.00
Typ
Unit
5.00
Max
Typ. 4.00V at +62Pa
Typ. 0.20V at –62Pa
4.00
4.00
V
Zero Pressure Output
2.10
0.250
0.250
V
Accuracy
Full scale output
(100 k load)
0.5
0.6
0.2
0.3
0.1
0.2
% FS (1)(2)
(also see Figure 1)
1.5
2
1.5
2
1
1.5
% m.v. (1)
Repeatability
0.3
0.5
0.3
0.5
0.3
0.5
% m.v. (1)
Offset stability
0
0.1
0
0.1
0
0.1
Pa / year
0.003
0.006
0.003
0.006
0
0
% FS/°C (2)
0.03
0.05
0.03
0.05
0.03
0.05
% m.v./°C
0.05
0.1
0.2
Pa
0.2
0.5
1.5
Pa
1.5
2.2
3
Pa
Additional error
over temperature
(T ≠ 23°C)
Resolution < 30% FS(1)
Resolution 30..70% FS(1)
Resolution > 70%
(1)
(2)
0.05
0.1
0.2
0.05
0.1
0.2
FS(1)
FS = full scale or span, m.v. = measured value, i.e. reading, whichever value is bigger
FS = full scale or span, i.e. for the SDP1000-L it is 500 Pa (2 “H2O), for the SDP1000-L025 it is 62 Pa (0.25 “H2O)
7
9
(1)
(2)
(3)
8
7
6
5
SDP1000 around 23°C
SDP1000 between 0°…50°C
Typical membrane based
sensor with 1.5% FS error
between 10°…40°C
4
3
(3)
2
(2)
(1)
1
10
4
3
3
2
20
30
40
50
60
70
80
90
100
1
0
0
1
2
3
4
repeatability [Pa]
differential pressure [% full scale]
Figure 1: Accuracy (includes errors caused by offset, linearity,
hysteresis and repeatability) of the SDP1000-L (1), (2)
compared with typical membrane sensors (3).
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2
5
1
0
0
(1) SDP1000-L
(2,3) Membrane based sensors
6
offset drift/year [Pa]
± error [ % of measured value]
10
Figure 2: Max. repeatability and offset drift/year of
the SDP1000-L (1) compared with two
typical membrane based sensors (2,3).
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Datasheet SDP1000 Series
Table 2: Additional sensor specifications.
(1)
Media
Air, N2 – for other gases contact Sensirion AG.
Operating Conditions:
- Temperature
- Humidity
-10 °C … +60 °C / 14°F … 140 °F
non-condensing
Ambient storage conditions1
-40 °C … +80 °C / -40°F … 176 °F
Orientation sensitivity
below resolution
Response time
40 ms
Admissible overpressure (short term)
1 bar (14.5 PSI)
Burst Pressure Capability
2 bar (29 PSI)
Weight
14 g
Protection Class
IP 20
Wetted materials
Glass (silicon nitride, silicon oxide), Silicon, PPS (Polyphenylene Sulfide),
PEEK (Polyetheretherketone), FR4, Silicone as static sealing, Epoxy, Gold
Gas flow through sensor
see Figure 6.
REACH and RoHS
REACH and RoHS compliant
For maximum 2 weeks
1.1 Temperature Compensation
The SDP1000 differential pressure sensors feature a
sophisticated built-in temperature compensation
circuit. The temperature is measured on the
CMOSens chip by means of a PTAT bandgap
reference temperature sensor. Its data is fed into a
compensation circuit which is also integrated on the
CMOSens® sensor chip. No external temperature
compensation is therefore required.
1.2 Altitude Correction
The SDP1000 differential pressure sensors achieve
their unsurpassed performance by using a dynamic
measurement principle, i.e. an applied differential
pressure forces a small air flow through the sensor.
This results in a dependence of the indicated
differential pressure on the ambient air density. While
the temperature effect is compensated (see
Paragraph 1.1) the altitude above sea level has an
influence on the SDP1000 output. If desired, this
effect can be compensated by a correction factor
according to the following equation:
Table 3: Altitude correction factors.
Altitude
[meter]
Ambient
Pressure
(Pamb) [mbar]
0
250
425
500
750
1500
2250
3000
1013
984
966
958
925
842
766
697
Correction Factor
Pcal / Pamb
0.95
0.98
1.00
1.01
1.04
1.15
1.26
1.38
Example:
The SDP1000 is used at 750 m above sea level. The
output of the SDP1000 shows 0.5 V, which
corresponds to Dpsensor = 33.3 Pa. Taking into account
the correction factor Pcal / Pamb = 1.04 the effective
differential pressure Dpeff is 33.3 Pa * 1.04 = 34.6 Pa.
Note:
Dpeff = Dpsensor * Pcal / Pamb
where Dpeff is the effective differential pressure,
Dpsensor the differential pressure indicated by the
SDP1000, Pcal the absolute pressure during
calibration (966 mbar) and Pamb the actual ambient
absolute pressure.
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This leads to the following correction factors:
In many HVAC applications such as filter monitoring,
fan/ventilator control or air flow measurement the
described effect is actually welcome since at the end
the mass flow and not volume flow is the effective
value to control.
Version 5.1 April 2017
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Datasheet SDP1000 Series
2
Electrical Specifications
2.1 Power Supply
The SDP1000 differential pressure sensors require a
stable voltage supply of 5 V. Influence of the supply
voltage variation on the offset and the sensitivity are
given in Table 5.
2.2 Voltage Output
The SDP1000 features a voltage output from 0.25 V
to 4.0 V (Figure 2). An output voltage below 0.25 V
indicates a negative differential pressure. This range
is not calibrated however. Exempt from this statement
is the SDP1000-L025, which features a fully
bidirectional calibration with 0.2 to 4.0 V output.
The resistive load at the output pin should be larger
than 20 kOhm. The capacitive load at the output pin
must not be larger than 200 pF. If the design shows a
larger capacity at the output pin an additional resistor
is required in series at the output (e.g. 620 Ohm).
Linear output
Formula: P = lfactor * (voltage(1) – 0.250)/3.750
lfactor =
Pascal
Inch water
(1)
SDP1000-L05
125
0.5
SDP1000-L
500
2
voltage: measured output voltage in Volt.
For bi-directional SDP1000-L025
Formula: P=lfactor * (voltage – 2.10)/1.90
lfactor = 62 Pa or 0.25 Inch water
Table 4: SDP1000 electrical characteristics.
Parameter
Conditions
Min.
Typ.
Max.
Units
5.0
5.25
VDC
4.3
5.2
mA
20
200
pF
20
100
k
4.75 V
5.0 V
5.25 V
Units
Power Supply Voltage VDD
Operating Current
4.75
5 V, no load, zero flow
Output capacitive load Cload
Recommended load Rload
To GND
Table 5: Typical power supply dependence of the offset and the sensitivity.
Parameter
Offset
Sensitivity
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Device
SDP1000-L025
- 3.5
+ 3.5
SDP1000-L05
- 0.4
+ 0.4
SDP1000-L
- 1.6
+ 1.6
SDP1000-L025
29.0
30.6
32.2
SDP1000-L05
28
30
32
SDP1000-L
7.1
7.5
7.9
Version 5.1 April 2017
Pa
mV/Pa
4/8
Datasheet SDP1000 Series
3
Physical Dimensions and Mounting Information
3.1 Housing
The SDP1000 differential pressure sensor is mounted
in chemically inert PPS housing. The rugged package
has been designed to withstand continuous
overpressures of at least 1 bar (14.5 PSI). Burst
pressure is > 2 bar (29 PSI)
The physical dimensions and mounting information is
given in Figure 4 and 5.
5.2
(0.205)
30.5
(1.200)
22.1
18.3 (0.870)
(0.720)
13.1
(0.516)
Pin#
Function
1
2
3
VDD (5 Vdc)
Ground
OUT (0.25…4 Vdc)
Figure 4: Pin out and physical dimensions in mm (inch). The
drawing is not to scale.
Dim.
[mm]
[inch]
[mil]
A
3.00
0.118
118
B
C
D
E
F
G
H
I
3.30
1.20
10.20
28.20
2.54
0.60
0.50
22.70
0.130
0.047
0.402
1.110
0.100
0.024
0.020
0.894
130
47
402
1110
100
24
20
894
Figure 5: SDP1000 PCB footprint. The drawing is
not to scale.
3.2 Soldering Instructions
The SDP1000 differential pressure sensor can be
wave soldered. Direct reflow soldering is not
recommended since it may affect the accuracy.
If reflow soldering is required Sensirion recommends
to use an SMD connector (e.g. type Samtec SSM103-L-SV) and to mount the SDP1000 after soldering.
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Datasheet SDP1000 Series
3.3 Connecting Hose
Sensirion recommends a hose with an inner diameter
of 1/8 to 3/20 inch (3.18 to 3.8mm). Due to the
dynamic measurement principle, a small air flow is
required (Figure 6) which leads to a dependence on
the length of the hose (Figure 7). Tubes up to 1 m
show less than 1 % error of the measured value
(Figure 7).
gas flow [sccm]
120
100
80
Length of the
connecting hose
Deviation of
Measured Value
60
0.5 m (20 inch)
- 0.4 %
40
1.0 m (40 inch)
- 0.8 %
2.0 m (80 inch)
- 1.6 %
4.0 m (160 inch)
- 3.2 %
20
0
0
20
40
60
80
100
differential pressure [% full scale]
Figure 6: Typical air flow through the SDP1000. Please note:
1 sccm = 1 cm3/min at 0°C and
1013 mbar pressure (1 sccm = 0.001 norm liter).
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Figure 7: Influence of the length of the connecting hose on
the accuracy (using 3/16 inch inner diameter).
Example: a 50 Pa difference pressure is shown as
49.8 Pa when using 0.5 m tube with 3/16 inch
diameter.
Version 5.1 April 2017
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Datasheet SDP1000 Series
4
Ordering Information
When ordering SDP1000 differential pressure sensors please refer to the following part names and article numbers. For the
latest product information and local distributor check out Sensirion’s website on http://www.sensirion.com
Table 6: Overview ordering information
Part Name
Output
Range (Full Scale)
Article Number
SDP1000-L025
Voltage 0.2 – 4.0 V, linear
± 62 Pa
± 0.62 mbar ± 0.25 "H20 ± 0.009 PSI
1-100313-03
SDP1000-L05
Voltage 0.25 - 4.0 V, linear
125 Pa
1.25 mbar
0.5 "H20
0.018 PSI
1-100235-03
SDP1000-L
Voltage 0.25 - 4.0 V, linear
500 Pa
5 mbar
2 "H20
0.07 PSI
1-100110-03
5
Revision history
Table 7: Revision history
Date
Version
Page(s)
Changes
November 2002
January 2003
December 2004
Juni 2005
March 2006
March 2006
Preliminary v0.9
First release
V2.6
V2.7
V2.8
V2.9
all
all
all
all
all
2,6
October 2006
May 2008
V3.0
V3.1
1,8,9
All
September 2008
V4.0
2-5,8
October 2011
February 2013
April 2017
V4.1
V5
V5.1
1
all
all
First preliminary release
Specifications, typos, various small modifications
Introduction type L05
Change of address, adjusted specifications for type L05
Introduction of Sensirion USA address, updated disclaimer
New Calibration temperature: 23°C. Change of barbs/ports diameter
specification
RoHS statement, Introduction of revision history in this document
RoHS statement on page 3, New disclaimer on page 10, Contact
addresses updated, Various small modifications, Inconsistency in Zero
Pressure / Full Scale Output corrected
SDP2000-R discontinued, new SDP1000-L025 implemented, power
consumption, power supply dependence and temperature dependence
changed due to new SF04 sensor chip version, article number index
counted up due to new sensor chip version. Small linguistic adaptations.
Block diagram changed
Updated product number. Minor updates.
Removed SDP1000-R and moved SDP2000-L to separate datasheet
No changes to SDP1000 specifications
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Version 5.1 April 2017
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Datasheet SDP1000 Series
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.
See application note “Handling Instructions” for more information.
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) day 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 -2017, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
Headquarters and Subsidiaries
SENSIRION AG
Laubisruetistr. 50
CH-8712 Staefa ZH
Switzerland
Sensirion Inc., USA
phone: +1 312 690 5858
info-us@sensirion.com
www.sensirion.com
Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info-kr@sensirion.com
www.sensirion.co.kr
phone: +41 44 306 40 00
fax:
+41 44 306 40 30
info@sensirion.com
www.sensirion.com
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info-jp@sensirion.com
www.sensirion.co.jp
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
www.sensirion.com.cn
Sensirion Taiwan Co. Ltd.
phone: +41 44 306 40 00
info@sensirion.com
To find your local representative,
please visit
www.sensirion.com/contact
6
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