Pressure sensors
Gauge pressure transducers
Series/Type: AK2 series
Ordering code:
Date: 2009-08-03
Version: 3
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Identification/Classification 1
(header 1 + top left bar):
Pressure sensors
Identification/Classification 2
(header 2 + bottom left header bar):
Gauge pressure transducers
Ordering code: (top right header bar)
Series/Type: (top right header bar) AK2 series
Preliminary data (optional):
(if necessary)
AS SEN PD
EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the i nformation
contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Pressure sensors
Gauge pressure transducers AK2 series
AS SEN PD 2009-08-03
Please read Cautions and warnings and Page 2 of 7
Important notes at the end of this document.
Description
The transducers are based on piezoresistive silicon pressure sensors
from our own clean room.
The robust stainless steel/plastic casing is accentuated
through its excellent mechanical decoupling.
Features
Piezoresistive MEMS technology
Measured media:
Air, non-aggressive gases (gas humidity 0 ... 100% r.h.)
and non-aggressive fluids.
Unsuitable for substances which react with glass, silicon, stainless
steel, silicone glue (pr ≤ 10 bar) or epoxy glue (pr > 10 bar).
Whetstone bridge with mV output, proportional to pressure
and ratiometric to supply voltage
RoHS-compatible, halogen-free
Dual-in-line package for PCB mounting
Dimensional drawings
Type KD (4.8 mm tube fitting) Type KC (M5 thread connection)
All dimensions in mm
Pressure sensors
Gauge pressure transducers AK2 series
AS SEN PD 2009-08-03
Please read Cautions and warnings and Page 3 of 7
Important notes at the end of this document.
Technical data
Absolute maximum ratings
Parameter Symbol Conditions Min. Typ. Max. Unit
Temperature ranges
Storage temperature range T
st 1)
–40 +125 °C
Operating temperature range T
a
2)
–30 +85 °C
Soldering temperature T
solder
<5 s
(no reflow soldering)
+240 °C
Supply voltage /-current
Supply voltage V
DD 5)
10 V
Parameter Symbol Conditions Min. Typ. Max. Unit
Offset / bridge resistance @ T
a
= 25 °C, V
DD
= 5 V
Bridge resistance R
S
Chip type C41 (pin1-3) 4.0 5.0 6.0 kΩ
Chip type C27 (pin1-3) 2.6 3.3 4.0 kΩ
Chip type C28 (pin1-3) 2.7 3.2 3.7 kΩ
Offset V
0
6)
–25 0 +25 mV
Data in temperature range @ T
a
= –30 ... 85 °C, V
DD
= 5 V
Temperature hysteresis
9)
±0.1 ±0.5 % FS
Temperature coefficients of the α
Rs
10)
2.1 2.4 2.7 10
-3
/K
bridge resistance β
Rs
4 6 8 10
-6
/K
2
Temperature coefficients of the α
S
11)
–2.4 –2.2 –2.0 10
-3
/K
sensitivity β
S
3 5 8 10
-6
/K
2
Temperature coefficient of offset TCV
0
12)
±4 µV/VK
Data dependent on rated pressure
@ T
a
= 25 °C, V
DD
= 5 V
Rated pressure p
r
3)
Chip type Sensitivity S
7)
Nonlinearity L
8)
Overpressure p
ov
4)
bar Min.
mV/bar
Typ.
mV/bar
Max.
mV/bar
Typ.
% FS
Max.
% FS
Min.
bar
0.025 C41 640 1000 1280 ±1 ±1.75 0.25
0.060 C41 450 700 833 ±0.75 ±1.5 0.35
0.100 C27 350 500 700 ±0.5 ±1 0.5
0.250 C27 300 400 480 ±0.5 ±1 0.6
0.400 C27 225 300 375 ±0.5 ±1 1
1.000 C27 90 120 150 ±0.25 ±0.5 3
2.500 C28 36 48 60 ±0.25 ±0.5 5
6.000 C28 15 20 25 ±0.25 ±0.5 9
10.00 C28 9 12 15 ±0.25 ±0.5 24
25.00 C28 3.6 4.8 6 ±0.25 ±0.5 37.5
Pressure sensors
Gauge pressure transducers AK2 series
AS SEN PD 2009-08-03
Please read Cautions and warnings and Page 4 of 7
Important notes at the end of this document.
Terminal assignment
Pin Symbol Terminal assignment
1 V
DD+
Supply voltage
2 V
out+
Output voltage
3 V
DD–
Supply voltage
4 V
out–
Output voltage
1 VDD+
2 Vout+
4 Vout–
3 VDD–
The polarity of V
out
applies to positive pressure.
Negative pressure or a reversed supply voltage
results in a reversed polarity of the output voltage V
out
.
Rated pressures and ordering codes
Type Type KD Type KC
Rated pressure p
r
bar
0.025
0.060
0.100
0.250
0.400
1.000
2.500
6.000
10.00
25.00
0.025
0.060
0.100
0.250
0.400
1.000
2.500
6.000
10.00
25.00
Product type
AKR 0.025 D20
AKR 0.060 D20
AKR 0.100 D40
AKR 0.250 D40
AKR 0.400 D40
AKR 1.000 D40
AKR 2.500 D80
AKR 6.000 D80
AKR 10.00 D80
AKR 25.00 D80
AKR 0.025 C20
AKR 0.060 C20
AKR 0.100 C40
AKR 0.250 C40
AKR 0.400 C40
AKR 1.000 C40
AKR 2.500 C80
AKR 6.000 C80
AKR 10.00 C80
AKR 25.00 C80
Ordering code
B58611K1100A001
B58611K1100A002
B58611K1100A003
B58611K1100A004
B58611K1100A005
B58611K1100A006
B58611K1100A007
B58611K1100A008
B58611K1100A009
B58611K1100A010
B58611K1500A007
B58611K1500A008
B58611K1500A009
B58611K1500A010
B58611K1500A011
B58611K1500A012
B58611K1500A013
B58611K1500A014
B58611K1500A015
B58611K1500A016
Other rated pressures upon request.
Pressure sensors
Gauge pressure transducers AK2 series
AS SEN PD 2009-08-03
Please read Cautions and warnings and Page 5 of 7
Important notes at the end of this document.
Symbols and terms
1)
Storage temperature range T
st
A storage of the pressure sensor within the temperature range T
st,min
up to T
st,max
and without applied pressure and supply voltage will not affect the performance of the pressure sensor.
2)
Operating temperature range T
a
An operation of the pressure sensor within the temperature range T
a,min
up to T
a,max
will not affect the performance of the pressure sensor.
3)
Rated pressure p
r
Within the rated pressure range 0 up to p
r
the signal output characteristic corresponds to this specification.
4)
Overpressure p
OV
Pressure cycles within the pressure range 0 up to p
ov
will not affect the performance of the pressure sensor.
5)
Supply voltage V
DD
V
DD,max
is the maximum permissible supply voltage, which can be applied without damages.
The output voltage V
out
is ratiometric (V
out
~ V
DD
).
6)
Offset V
0
The offset V
0
is the signal output V
out
(p = 0) at zero pressure.
7)
Sensitivity S
Within the pressure range 0 up to p
r
the output voltage is V
out
(p
x
) = V
0
+ S · p
x
8)
Nonlinearity L (including pressure hysteresis)
The nonlinearity is the deviation of the real sensor characteristic V
out
= f(p) from the ideal straight line.
It can be approximated by a polynomial of second order, with the maximum at p
x
= p
r
/ 2 .
The equation to calculate the nonlinearity is:
r
x
0rout
0xout
p
p
V)p(V
V)p(V
L−
−
−
=
9)
Temperature hysteresis
The temperature hysteresis is the change of offset, starting from the value at 25 °C after a temperature change
and return to 25 °C. Determined during temperature cycles in operating temperature range (cycles with 1 K/min).
(Full Scale): FS = V
FS
= S · p
r
10)
Temperature coefficients of the bridge resistance α
αα
α
RS
, β
ββ
β
RS
Bridge resistance at temperature T
x
: R
S
(T
x
) = R
S
(25 °C) · [ 1 + α
RS
· (T
x
– 25 °C) + β
RS
· (T
x
– 25 °C)
2
]
Values are valid within the operating temperature range T
a,min
up to T
a,max
Out of the operating temperature range, the deviation may increase.
11)
Temperature coefficients of the sensitivity α
αα
α
S
, β
ββ
β
S
Sensitivity at temperature T
x
: S(T
x
) = S(25 °C) · [ 1 + α
S
· (T
x
– 25 °C) + β
S
· (T
x
– 25 °C)
2
]
Values are valid within the operating temperature range T
a,min
up to T
a,max
Out of the operating temperature range, the deviation may increase.
12)
Temperature coefficient of offset TCV
0
Offset at temperature T
x
: V
0
(T
x
) = V
0
(25 °C) + TCV
0
· (T
x
– 25 °C) · V
DD
Values are valid within the operating temperature range T
a,min
up to T
a,max
Out of the operating temperature range, the deviation may increase.
Pressure sensors
Gauge pressure transducers AK2 series
AS SEN PD 2009-08-03
Please read Cautions and warnings and Page 6 of 7
Important notes at the end of this document.
Cautions and warnings
Storage (general)
All pressure sensors should be stored in their original packaging. They should not be placed in harmful environments such
as corrosive gases nor exposed to heat or direct sunlight, which may cause deformations. Similar effects may result from
extreme storage temperatures and climatic conditions. Avoid storing the sensor dies in an environment where condensation
may form or in a location exposed to corrosive gases, which will adversely affect their performance. Plastic materials should
not be used for wrapping/packing when storing or transporting these dies, as they may become charged. Pressure sensor
dies should be used soon after opening their seal and packaging.
Operation (general)
Media compatibility with the pressure sensors must be ensured to prevent their failure. The use of other media can cause
damage and malfunction. Never use pressure sensors in atmospheres containing explosive liquids or gases.
Ensure pressure equalization to the environment, if gauge pressure sensors are used. Avoid operating the pressure sensors
in an environment where condensation may form or in a location exposed to corrosive gases. These environments adversely
affect their performance.
If the operating pressure is not within the rated pressure range, it may change the output characteristics. This may also
happen with pressure sensor dies if an incorrect mounting method is used. Be sure that the applicable pressure does not
exceed the overpressure, as it may damage the pressure sensor.
Do not exceed the maximum rated supply voltage nor the rated storage temperature range, as it may damage the pressure
sensor.
Temperature variations in both the ambient conditions and the media (liquid or gas) can affect the accuracy of the output
signal from the pressure sensors. Be sure to check the operating temperature range and thermal error specification of the
pressure sensors to determine their suitability for the application.
Connections must be wired in accordance with the terminal assignment specified in the data sheets. Care should be taken
as reversed pin connections can damage the pressure transmitters or degrade their performance. Contact between the
pressure sensor terminals and metals or other materials may cause errors in the output characteristics.
Design notes (dies)
This specification describes the mechanical, electrical and physical requirements of a piezoresistive sensor die for
measuring pressure. The specified parameters are valid for the pressure sensor die with pressure application either to the
front or back side of the diaphragm as described in the data sheet. Pressure application to the other side may result in
differing data. Most of the parameters are influenced by assembly conditions. Hence these parameters and the reliability
have to be specified for each specific application and tested over its temperature range by the customer.
Handling/Mounting (dies)
Pressure sensor dies should be handled appropriately and not be touched with bare hands. They should only be picked up
manually by the sides using tweezers. Their top surface should never be touched with tweezers. Latex gloves should not be
used for handling them, as this will inhibit the curing of the adhesive used to bond the die to the carrier. When handling, be
careful to avoid cuts caused by the sharp-edged terminals. The sensor die must not be contaminated during manufacturing
processes (gluing, soldering, silk-screen process).
The package of pressure sensor dies should not to be opened until the die is mounted and should be closed after use. The
sensor die must not be cleaned. The sensor die must not be damaged during the assembly process (especially scratches on
the diaphragm).
Soldering (transducers, transmitters)
The thermal capacity of pressure sensors is normally low, so steps should be taken to minimize the effects of external heat.
High temperatures may lead to damage or changes in characteristics.
A non-corrosive type of flux resin should normally be used and complete removal of the flux is recommended.
Avoid rapid cooling due to dipping in solvent. Note that the output signal may change if pressure is applied to the terminals
during soldering.
This listing does not claim to be complete, but merely reflects the experience of EPCOS AG.
Important notes
Page 7 of 7
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical
requirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application. As a
rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them
than the customers themselves. For these reasons, it is always ultimately incumbent on the
customer to check and decide whether an EPCOS product with the properties described in the
product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or failure
before the end of their usual service life cannot be completely ruled out in the current state
of the art, even if they are operated as specified. In customer applications requiring a very high
level of operational safety and especially in customer applications in which the malfunction or
failure of an electronic component could endanger human life or health (e.g. in accident
prevention or life-saving systems), it must therefore be ensured by means of suitable design of the
customer application or other action taken by the customer (e.g. installation of protective circuitry
or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or
failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our Material
Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed
questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products. Consequently,
we cannot guarantee that all products named in this publication will always be available.
The aforementioned does not apply in the case of individual agreements deviating from the
foregoing for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current version of
the “General Terms of Delivery for Products and Services in the Electrical Industry”
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DSSP, MiniBlue,
MiniCell, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, SIFERRIT,
SIFI, SIKOREL, SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse,
WindCap are trademarks registered or pending in Europe and in other countries. Further
information will be found on the Internet at www.epcos.com/trademarks.
