SDP1000 / SDP2000
Low Range Differential Pressure Sensor
for Air and Non-Aggressive Gases
− For cost sensitive 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
actual size
Data Sheet – v5
SDP1000 / SDP2000 Product Summary
around the SDP1000 / SDP2000 make a high quality
differential sensor transmitter with e.g. an 0...10 V output
or other interfaces (see Figure 8).
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 (see
Figure 6). This leads to a reliable operation even under
harsh conditions. In comparison to membrane based
sensors the SDP1000 / SDP2000 differential pressure
sensors show an extended measurement range, better
offset stability and improved reproducibility even at
lowest pressure ranges (see Figure 1 and 2). In addition
the SDP1000 / SDP2000 is robust against pressure
bursts and shows no sensitivity to the mounting
orientation.
SDP1000 / SDP2000 is fully RoHS compliant.
Applications
Block Diagram
www.sensirion.com
D/A
converter
DIGITAL
Linearization and
Temperature
compensation
A/D converter
CMOSens®
SENSOR CHIP
Differential
pressure
Sensor
- Medical
- HVAC
- Automotive
- Process Automation
Memory
The SDP1000 / SDP2000 differential pressure sensors
for air cover the following measurement ranges: –5 to
125 Pa (0.5 inch H2O), -20 to 500 Pa (2 inch H2O), and 100 to 3500 Pa (14 inch H2O).
Mounted in a rugged, chemically inert PPS housing the
SDP1000 / SDP2000 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 / SDP2000 differential pressure sensor is
analog, the internal linearization and temperature
compensation is performed digitally. This results in a
superior accuracy, outstanding resolution (up to 0.05
Pa), and lowest temperature dependence. The SDP1000
is available with a linear or square root extracted output
characteristics at the same price. Since fully
exchangeable just a few external electronic components
VDD
5.0 V
GND
OUT
0.25 V
to 4 V
Sensirion - the sensor company
1
Specifications
Table 1: Sensor specifications (at 23°C and pabsolute = 966 mbar, VDD = 5.0 V unless otherwise noted).
Parameter
SDP1000-L025
SDP1000-L05
Min
Max
Min
62
-5
Typ
-62
Measurement range
Power supply
-0.25
4.75
(see Tab 4)
Typ
Max
Min
125
5.25
4.75
5.00
Typ
SDP1000-R
Max
Min
- 20
500
0.5
-0.08
5.25
4.75
0.25 -0.02
5.00
SDP1000-L
5.00
Typ
SDP2000-L
Max
Min
- 20
500
-100
3500
Pa
2
-0.08
2
-0.4
14
Inch water
5.25
4.75
5.25
4.75
5.25
V
5.00
Typ
Unit
Max
5.00
Typ. 4.00V at +62Pa
Typ. 0.20V at –62Pa
4.00
4.00
4.00
4.00
V
Zero Pressure Output
2.10
0.250
0.250
0.250
0.250
V
Accuracy
0.5
0.6
0.2
0.3
0.1
0.2
0.2
0.3
0.1
0.2
% FS (1)(2)
(also see Figure 1)
1.5
2
1.5
2
1
1.5
1
1.5
1
1.5
% m.v. (1)
Repeatability
0.3
0.5
0.3
0.5
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
0
±0.3
0
±0.3
Pa / year
0.003 0.006
0.003 0.006
0
0
0
0
0
0
% FS/°C (2)
0.03
0.03
0.03
0.05
0.03
0.05
0.03
0.05
0.1
0.2
0.05
0.1
0.2
0.2
0.5
1
Pa
0.2
0.5
1.5
0.2
0.5
1.5
1
2.5
8
Pa
1.5
2.2
3
1.5
2.2
3
8
11
14
Pa
Full scale output
(100 kΩ load)
Additional error
over temperature
(T ≠ 23°C)
Resolution < 30%
0.05
0.05
FS(1)
Resolution 30..70% FS(1) 0.05
0.1
0.2
0.05
0.1
0.2
Resolution > 70% FS(1)
0.05 % m.v./°C
(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 it is 500 Pa (2 “H2O), for the SDP1000-L025 it is 62 Pa (0.25 “H2O),
(3) See 2.2 Voltage Output formula for conversion
(2)
7
9
(1)
8
7
(2)
6
(3)
5
4
SDP1000 / SDP2000 around
23°C
SDP1000 / SDP2000 between
0°…50°C
Typical membrane based
sensor with 1.5% FS error
between 10°…40°C
3
(3)
2
(1) SDP1000-L
(2,3) Membrane based sensors
6
offset drift/year [Pa]
± error [ % of measured value]
10
5
2
4
3
3
2
(2)
1
(1)
1
0
0
10
20
30
40
50
60
70
80
90
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).
www.sensirion.com
1
0
100
Figure 2: Max. repeatability and offset drift/year of
the SDP1000-L (1) compared with two
typical membrane based sensors (2,3).
v5 February 2013
2/10
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 (for faster response time contact Sensirion)
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.
Lead free
The SDP1000 family is fully RoHS compliant
For maximum 2 weeks
1.1 Temperature Compensation
The SDP1000 / SDP2000 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 / SDP2000 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 / SDP2000 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 / SDP2000, Pcal the absolute pressure
during calibration (966 mbar) and Pamb the actual
ambient absolute pressure.
www.sensirion.com
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.
v5 February 2013
3/10
2
Electrical Specifications
2.1 Power Supply
The SDP1000 / SDP2000 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 / SDP2000 features a voltage output
from 0.25 V to 4.0 V (Figure 2, 3). 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
Square Root output
Formula: P = lfactor * (voltage(1) – 0.250)/3.750
Formula: P = rfactor * (voltage(1) -0.250)^2
lfactor =
Pascal
Inch water
(1)
SDP1000-L05 SDP1000-L
125
500
0.5
2
SDP2000-L
3500
14
rfactor =
Pascal
Inch water
(1)
voltage: measured output voltage in Volt.
SDP1000-R
35.55556
0.14222
voltage: measured output voltage in Volt.
For bi-directional SDP1000-L025
Formular: P=lfactor * (voltage – 2.10)/1.90
lfactor = 62 Pa or 0.25 Inch water
4.00
4.00
SDP1000-R / SDP2000-R
SDP1000-L / SDP2000-L
output voltage [V]
output voltage [V]
3.00
2.00
1.00
0.00
0
20
40
60
80
100
3.00
2.00
1.00
0.00
0
differential pressure [% full scale]
40
60
80
100
differential pressure [% full scale]
Figure 2: Linear output at 5 Vdc supply of the SDP1000-L
and the SDP2000-L. The fine lines indicate the
maximum tolerances including a temperature
variation from 0 to 50°C.
www.sensirion.com
20
Figure 3: Square root extracted output of the SDP1000-R
and the SDP2000-R at 5 Vdc supply. The fine lines
indicate the maximum tolerances including a
temperature variation from 0 to 50°C.
v5 February 2013
4/10
Table 4: SDP1000 / SDP2000 electrical characteristics.
Parameter
Conditions
Min.
Typ.
Max.
Units
5.0
5.25
VDC
4.3
5.2
mA
20
200
pF
20
100
∞
kΩ
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
Table 5: Typical power supply dependence of the offset and the sensitivity.
Parameter
Offset
Sensitivity
www.sensirion.com
Device
SDP1000-L05
- 0.4
+ 0.4
SDP1000-L
- 1.6
+ 1.6
SDP2000-L
- 10.3
+ 10.3
SDP1000-L05
28
30
32
SDP1000-L
7.1
7.5
7.9
SDP2000-L
1.01
1.07
1.13
v5 February 2013
Pa
mV/Pa
5/10
3
Physical Dimensions and Mounting Information
3.1 Housing
The SDP1000 / SDP2000 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)
5.2
5.4
(0.205)
The physical dimensions and mounting information is
given in Figure 4 and 5.
A
A
16.0
(0.630)
(0.213)
3.4
(0.134)
No Components
inside this Area
C
H
30.5
(1.200)
G
I
Lo
44.0
(1.732)
Hi
F
B
2.54
(0.100)
Pin# 1
2 3
D
1.8
(0.071)
30.0
(1.181)
Function
1
2
3
VDD (5 Vdc)
Ground
OUT (0.25…4 Vdc)
E
22.1
18.3 (0.870)
(0.720)
13.1
(0.516)
Pin#
B
SDP100000206-10033-250-001
Figure 4: Pin out and physical dimensions in mm (inch). The
drawing is not to scale.
3.2 Soldering Instructions
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 / SDP2000 PCB footprint. The
drawing is not to scale.
103-L-SV) and to mount the SDP1000 / SDP2000
after soldering.
The SDP1000 / SDP2000 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 SSM-
www.sensirion.com
v5 February 2013
6/10
3.3 Connecting Hose
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).
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
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 / SDP2000.
Please note: 1 sccm = 1 cm3/min at 0°C and
1013 mbar pressure (1 sccm = 0.001 norm liter).
4
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.
Application Example: A High End Differential Pressure Sensor
Vsupply
12V
IC1
Example:
5V
IC2
C1
C1
C2
Output Vout : 0…10 Vdc
Range: 0…500 Pa, linear characteristics
Power supply Vsupply: 14.5… 27 Vdc
SDP1000 / SDP2000
1 1
2 2
3 3
R1
R1
5V
12V
12V
12V
OP2
R2
OP1
R3
+
-
R1
OP3
+
-
+
-
R4
Vout
R6
R1
R5
Component
Value
IC1
LM78L12
IC2
LP2980
SDP
SDP1000
OP1, OP2, OP3
LMC6044
C1
200 nF
C2
2.2 uF
R1
10 kΩ (5%, 10 ppm)
R2
18 kΩ (5%, 10 ppm)
R3
1 kΩ (5%, 10 ppm)
R4
100 Ω
6 kΩ (3x18 kΩ 5%, 10 ppm in
parallel)
10 kΩ (5%, 10 ppm)
R5
Vout = (VSDP – 5V * (R3/(R2+R3))) * (R5+R6)/R5
R6
Figure 8: Schematic of a high-end differential pressure transmitter using the SDP1000 / SDP2000. With only a few external
components and no additional calibration the transmitter features an accurate and temperature compensated 0…10 Vdc
output signal. (Component values not valid for SDP1000-L025.)
www.sensirion.com
v5 February 2013
7/10
5
Ordering Information
When ordering SDP1000 / SDP2000 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
SDP2000-L
Voltage 0.25 - 4.0 V, linear
3500 Pa
35 mbar
14 "H20
0.50 PSI
1-100113-03
SDP1000-R
Voltage 0.25 - 4.0 V, square root
500 Pa
5 mbar
2 "H20
0.07 PSI
1-100111-03
SDPx000-OEM
For high quantity OEM versions (e.g. with digital output), please contact Sensirion.
6
-
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
V4.1
V5
1
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.
Notes:
www.sensirion.com
v5 February 2013
8/10
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 data sheet 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 “ESD, Latchup and EMC” 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) 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;
www.sensirion.com
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 data sheet 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© 2001-2008, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
RoHS and WEEE Statement
The SDP1000 family complies with requirements of the
following directives:
• EU Directive 2002/96/EC on waste electrical
and
electronic
equipment
(WEEE),
OJ13.02.2003; esp. its Article 6 (1) with Annex
II.
• EU Directive 2002/95/EC on the restriction of
the use of certain hazardous substances in
electricaland electronic equipment (RoHS), OJ
13.02.2003; esp. its Article 4.
v5 February 2013
9/10
Headquarters and Sales Offices
Sensirion AG
Laubisruetistrasse 50
CH-8712 Staefa ZH
Switzerland
Phone:
Fax:
e-mail:
Web:
+ 41 44 306 40 00
+ 41 44 306 40 30
info@sensirion.com
www.sensirion.com
SENSIRION Inc
Westlake Pl. Ctr. I, suite 240
2801 Townsgate Road
Westlake Village, CA 91361
USA
Phone:
Fax:
e-mail:
Web:
+1 805-409 4900
+1 805-435 0467
michael.karst@sensirion.com
www.sensirion.com
Sensirion Korea Co. Ltd.
#1414, Anyang Construction Twr B/D
1112-1, Bisan-dong, Anyang-city
Gyeonggi-Province,
South Korea
Phone:
Fax:
e-mail:
Web:
+82 31-440-9925~27
+82 31-440-9927
info@sensirion.co.kr
www.sensirion.co.kr
SENSIRION Japan
Sensirion Japan Co. Ltd.
Shinagawa Station Bldg. 7F
4-23-5 Takanawa
Minato-ku, Tokyo, Japan
phone:
fax:
e-mail:
Web:
+81 3-3444-4940
+81 3-3444-4939
info@sensirion.co.jp
www.sensirion.co.jp
www.sensirion.com
v5 February 2013
10/10
