SF2-FilterCap

Datasheet Filter Cap SF2
For Humidity and Temperature Sensor SHT2x
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Protection against dust and particles
Protection against water immersion
Designed to match on SHT2x DFN type sensors
Optimized for response time of sensor
Product Summary
The filter cap SF2 protects SHT2x humidity and
temperature sensors against dust, water immersion as
well as against contamination by particles. The cavity
inside is made such that the volume between membrane
and sensor is kept minimal and hence the impact on
response time for humidity measurements is reduced to a
minimum. The filter cap SF2 is available in black color
with a black filter membrane.
Dimensions
The filter cap SF2 is made of a single piece of
Polybutylene Terephthalate (PBT) with a filter membrane
welded on it. The SF2 filter cap is designed to be mounted
after soldering by clipping the four pins into openings in
the PCB. Together with the sensor it provides a compact
entity which may serve as an adaptor to the device
housing. Adding adhesive for seal to PCB and using an oring it serves for a waterproof mounting solution.
Technical Specifications
Parameter
Operating Range
IP1
RoHS
Body material
4.0
3.4
6.0
R3.2
A
A
Body Color
UL94 (Body material only)
Filter material
Filter Color
Filter Thickness
Filter pore size
Filtration efficiency 2
Oleophobic Rating (Filter)3
Mullen Hydrostatic
1.0
A-A
0.27
Ø 5.05
Ø 3.0
3.4
1.4
1.9
0.65
0.95
0.5
SHT21
1.5
1.2
0.2
R0.5
1
Figure 1: Drawing of the filter cap SF2 (body only). Dimensions
are given in mm (1mm = 0.039inch), tolerances are ±0.1mm.
Add 0.15 to total height due to the filter membrane. The cavity
inside the cap fits to SHT2x sensors. Additional space for solder
joints are left open around the sensor.
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2
3
Value
-40 … 125°C
IP67
Compliant
Polybutylene Terephthalate
(PBT)
Black
UL94 V-0 (0.73mm)
PTFE with polyester scrim
Black
0.13 mm
1.5 μm
99.99%
8
>100mbar (>1m water)
IP67: dust tight, protected against harmful water immersion up
to 1m water column. (http://en.wikipedia.org/wiki/IP67) .
To achieve IP67 at the connections between the housing or
the PCB and the SF2 is up to the customer.
0.1µm particles at 0.05m/s air flow.
Repellence of oil and hydrocarbons according to
AATCC 118-1992 standard. Rating goes from 0 – 8 while 8 is
most repellent.
Version 2 – December 2011
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Datasheet Filter Cap SF2
User’s Guide Filter Cap SF2
membrane
o-ring
housing
SHT2X
SF2
1.0
5.1 (5.28)
0.3
Sensor
1.
6
5.1 (5.28)
0.7
0.4
0.4
filter cap
Mounting Instruction
The filter cap SF2 is mounted to the PCB after soldering
the SHT2x sensor by clipping the four pins into the
openings in the PCB. The filter cap may be fixed by
adhesive or by the force of the pins itself – compare Figure
2. By choosing different distances between the openings
the SF2 either clips itself on the PCB by mechanical force
or the pins can be used for positioning only – compare
Figure 3. The recommended PCB thickness for mounting
with clips is ≥ 0.8mm. Please note that when mounting the
filter cap with clips, a hermetic seal between filter cap and
PCB cannot be guaranteed. This should be considered for
applications in which the filter cap is used to seal the
volume around the sensor against surrounding volume
which is enclosed by a housing (compare Figure 2). For
further information on handling and assembly of SF2 filter
caps please refer to the application Note “Handling and
Assembly of SF2 Filter Cap”.
0.2
2.4
1.0
1.0
Figure 3: PCB layout of SHT2x and filter cap SF2. Dimensions
are given in mm (1mm = 0.039 inch). The distance of the
openings is 5.1mm ±0.05mm if the sensor should clip on the
PCB and 5.28mm if the pins are used for adjustment only. By
varying the openings distance about ±0.05mm the clipping force
may be adjusted.
PCB
Figure 2: Side view of SF2 filter cap mounted between PCB and
housing wall. The volume below membrane is kept minimal and
the is separated from surrounding volume enclosed by housing.
Measures for higher protection
For hermetic seal, adhesive must be added between filter
cap and PCB. Such seal provides higher security against
water leakage, condensation inside the housing, and
corrosion of the soldering pads of the sensor. If corrosion
of the solder contacts is a potential problem, it is
recommended to cover the solder joints with adhesive as
well. For further information on application of adhesives
with SF2 filter caps, please refer to the application Note
“Handling and Assembly of SF2 Filter Cap”.
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Mounting against housing wall
The filter cap SF2 not only protects against dust and water
immersion, it also helps to mount the sensor to the
housing wall. If mounted to a housing wall towards the
outside, the sensor is perfectly exposed to the
environment of which humidity and temperature shall be
measured.
In order to protect the inside of the device housing against
water immersion it is recommended to place an o-ring
between filter cap and housing wall – compare Figure 2.
For such o-rings Sensirion recommends the following
specifications:
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

Inner diameter:
Cross section:
Material:
5mm
1mm
NBR
Important: Please ensure that the air path to the measured
volume is not blocked by another membrane. This may
increase response time of the sensor dramatically.
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Datasheet Filter Cap SF2
Labeling of the shipment
Each shipment is labeled with product and tracking
information – compare Figure 4.
Part Description:
Filter Cap SF2
Customer P/N:
1-100726-01
Quantity:
100 Pcs
Lot No.:
WXXXXXXX
Production Date:
MM/DD/YYYY
Shipping Package
The SF2 are provided in trays of 100 pieces per tray.
Figure 4: Label on shipment packaging: Customer P/N refers to
the Sensirion product number, Lot No. refers to suppliers
tracking information. Production Date is given as MM = month,
DD = day, YYYY = year.
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Version 2 – December 2011
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Datasheet Filter Cap SF2
Revision History
Date
August 2010
December 2011
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Version
1.0
2
Page(s)
1–3
2
Changes
Changed front picture, completed technical spec. and labeling (DBO)
More detailed information to mounting of filter cap, reference to application note.
Version 2 – December 2011
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Datasheet Filter Cap SF2
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. 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.
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 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© 2011, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
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SENSIRION AG
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phone: +1 805 409 4900
info_us@sensirion.com
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phone: +82 31 345 0031 3
info@sensirion.co.kr
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phone: +41 44 306 40 00
fax:
+41 44 306 40 30
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phone: +81 3 3444 4940
info@sensirion.co.jp
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phone: +86 755 8252 1501
info@sensirion.com.cn
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phone: +41 44 927 11 66
info@sensirion.com
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To find your local representative, please visit www.sensirion.com/contact
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