1-100726-01 - SENSIRION - Datasheet.Live

www.sensirion.com Version 2 – December 2011 1/5

Datasheet Filter Cap SF2

For Humidity and Temperature Sensor SHT2x

 Protection against dust and particles

 Protection against water immersion

 Designed to match on SHT2x DFN type sensors

 Optimized for response time of sensor

Dimensions

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.

Technical Specifications

Parameter

Value

Operating Range

-40 … 125°C

IP1

IP67

RoHS

Compliant

Body material

Polybutylene Terephthalate

(PBT)

Body Color

Black

UL94 (Body material only)

UL94 V-0 (0.73mm)

Filter material

PTFE with polyester scrim

Filter Color

Black

Filter Thickness

0.13 mm

Filter pore size

1.5 μm

Filtration efficiency 2

99.99%

Oleophobic Rating (Filter)3

Mullen Hydrostatic

>100mbar (>1m water)

1 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.

2 0.1µm particles at 0.05m/s air flow.

3 Repellence of oil and hydrocarbons according to

AATCC 118-1992 standard. Rating goes from 0 – 8 while 8 is

most repellent.

A-A

1.2

0.5

1.4

1.9

1.5

0.27

Ø 3.0

Ø 5.05

3.4

SHT21

0.65

0.95

R0.5

0.2

R3.2

4.0

3.4

1.0

6.0

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.

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 o-

ring it serves for a waterproof mounting solution.

Datasheet Filter Cap SF2

www.sensirion.com Version 2 – December 2011 2/5

User’s Guide Filter Cap SF2

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”.

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”.

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.

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:

 Inner diameter: 5mm

 Cross section: 1mm

 Material: 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.

SHT2X

PCB

housing

o-ring

membrane

SF2

1.0

2.4

0.3

0.4

0.7

0.2

5.1 (5.28)

1.0

filter cap

Sensor

Datasheet Filter Cap SF2

www.sensirion.com Version 2 – December 2011 3/5

Labeling of the shipment

Each shipment is labeled with product and tracking

information – compare Figure 4.

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.

Shipping Package

The SF2 are provided in trays of 100 pieces per tray.

Part Description: Filter Cap SF2

Customer P/N: 1-100726-01

Quantity: 100 Pcs

Lot No.: WXXXXXXX

Production Date: MM/DD/YYYY

Datasheet Filter Cap SF2

www.sensirion.com Version 2 – December 2011 4/5

Revision History

Date

Version

Page(s)

Changes

August 2010

1.0

1 – 3

Changed front picture, completed technical spec. and labeling (DBO)

December 2011

More detailed information to mounting of filter cap, reference to application note.

Datasheet Filter Cap SF2

www.sensirion.com Version 2 – December 2011 5/5

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.

CMOSens® is a trademark of Sensirion

Headquarters and Subsidiaries

SENSIRION AG

Laubisruetistr. 50

CH-8712 Staefa ZH

Switzerland

phone: +41 44 306 40 00

fax: +41 44 306 40 30

info@sensirion.com

www.sensirion.com

Sensirion Inc., USA

phone: +1 805 409 4900

info_us@sensirion.com

www.sensirion.com

Sensirion Japan Co. Ltd.

phone: +81 3 3444 4940

info@sensirion.co.jp

www.sensirion.co.jp

Sensirion Korea Co. Ltd.

phone: +82 31 345 0031 3

info@sensirion.co.kr

www.sensirion.co.kr

Sensirion China Co. Ltd.

phone: +86 755 8252 1501

info@sensirion.com.cn

www.sensirion.com.cn

Sensirion AG (Germany)

phone: +41 44 927 11 66

info@sensirion.com

www.sensirion.com

To find your local representative, please visit www.sensirion.com/contact