Datasheet SF1 Datasheet (SENSIRION)

p

SF1 Filter Cap

Filter Cap for Humidity &
Tem

erature Sensors SHT1x

_ Protection against dust and other contaminants
_ Water proof, IP67 protection class
_ Easy mounting of sensor into housing

SF1 Filter Cap Product Summary

The SF1 Filter Cap provides IP67 protection against water, dust and other contaminants for the humidity and temperature
sensors SHT11 and SHT15. It is a low cost part and very easy to use. The Filter Cap consists of a single piece of polypropylene
including a filter membrane. It fits the outer dimensions of the SHT1x sensors and allows for compact system design. It also
serves as an adaptor for mounting the sensor directly into the wall of a housing. Using a sealing ring, this results in a waterproof
mounting solution.

Applications

- HVAC

- Automotive

- Test & Measurement

- Data Logging

- Automation

- White Goods

- Medical

Ordering Information

Filter Cap 1-100188-01

Part Number

1 Filter Cap Specifications

Parameter Conditions Min.

Body material Polypropylene (PP)
Filter material PTFE with polyester

Temperature Range -40 100 °C

70 kPa Mullen Hydrostatic

(water resistance pressure)

7 meter water column

Response Time RH 1/e (63%) slowly moving air1 30 s
Oleophobicity Rating
Filtration Efficiency

2

3

0.1 µm particles @

6 (Scale from 0-10)

99.99 %

0.05 m/s air velocity

Filter pore size 1.5 micron
Protection class

Table 1 Filter Cap Specifications

4

IP67

1

Slowly moving air: 0.03m/s

2

Repellence of oil and hydrocarbons according to AATCC (American Association of Textile Chemists and Colorists) standard.

Rating 6 means n-decane is repelled.

3

Percentage of particles with size 0.1μm filtered at given air flow

4

IP67 requires to be "dust tight" and "protected against the effects of temporary immersion".

www.sensirion.com Sensirion 1/5

Typ. Max. Units

scrim (PP)

SF1 Filter Cap

2 Application Information

Using the Filter Cap, a separation can be made between the environment, in which relative humidity is to be measured and the
readout electronics. Such a separation is needed mainly in areas with a lot of dust particles in the air: in HVAC applications,
where large volumes of airflow are passing the sensor, or in appliances (e.g. lints in garment dryers) or in agricultural
environments, where dust and dirt are present. Furthermore, consistent and reliable humidity measurements are enabled by
protection against water immersion.
Another important issue addressed by the Filter Cap is how to mount the sensor in a housing. It provides a simple, easy-to­apply possibility to mount the sensor in e.g. HVAC transmitters, data loggers, air ducts etc. The filter membrane allows for
waterproof mounting up to 7 m water column when the sealing ring is used in addition.

3 Mounting Information

There are three possibilities to mount the through hole Filter Cap:

• Fixed between PCB and housing wall by small pressure

• Glued to the PCB and/or housing wall

• The two pins of the Filter Cap are heated up to at least 160°C with a heating tool to melt and form a robust fastening.

3.1 Mounting against housing wall

housing

Filtercap

SHT1x

PCB

melted plastic pin

housing

Figure 1 The PCB with the Filter Cap is pressed against the housing wall and the plastic pins are melted.

3.2 Waterproof mounting

o-ring

housing housing

Filtercap

SHT1x

PCB

melted plastic pin

Figure 2 Waterproof mounting by using an O-ring for sealing

The o-ring, which is not provided by Sensirion, should meet the following specifications:

• Inner diameter: 6 mm (0.236 inch)

• Cross section: 1 mm (0.04 inch)

• Material: NBR

This o-ring can be sourced worldwide at Busak + Shamban: http://www.busakshamban.com, Part. No. OR1000600

www.sensirion.com Rev.1.1 2/5

SF1 Filter Cap

Note: To absolutely avoid leakage of high humidity or condensation into the housing and to avoid corrosion of the soldering

pads of the sensor, it is necessary to put glue between the Filter Cap and the sensor. This can be done by applying glue on the
FR4 substrate of the sensor around the black cap before mounting the Filter Cap.
Sensirion recommends the following two glue types:

- Epoxy EE8016F-EB0363 from Loctite:

- SMA10SL from Electrolube:

http://www.electrolube.co.uk/docs/tds/SMA.pdf

http://content.loctite-europe.com/tds/EE8016F-EB0363.pdf

4 Dimensions, footprint and delivery

4.1 Dimensions

Figure 3 Dimensions of the Filter Cap in mm (inch), tolerances: +/- 0.03 mm

4.2 Footprint

Recommended PCB Footprint

1.7 (0.067)

1.27

6.67 (0.263)

0.8 (0.0315)1.45 (0.057)

0.15 (0.059)

1.8 (0.07)

No Copper inside this field

3.48 (0.137)

7.08 (0.279)

7.23 (0.285)

1.8 (0.07)

1.27

4.61 (0.1815)

1.27 (0.05)

Figure 4 Footprint dimensions are in mm (inch)

www.sensirion.com Rev.1.1 3/5

SF1 Filter Cap

4.3 Delivery Condition

Package containing 4 packs, each holding 100 pcs.

5 Revision history

Date Version Page(s) Changes

September 2003 Preliminary 1-5 First release
March 2004 1.01 1-5 Reworked release, preliminary
November 2004 1.04 3 Added glue type for sealing and corrosion protection
February 2005 1.05 2 Changed specification for o-ring, added sourcing information for o-ring
May 25, 2005 1.06 Changed company address
October 2, 2006 1.1 Sensirion Inc. address added, disclaimer modified

The latest version of this document and all application notes can be found at:

http://www.sensirion.com/humidity

6 Important Notices

6.1 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.

6.2 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.

6.3 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.

www.sensirion.com Rev.1.1 4/5

SF1 Filter Cap

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© 2001-2005, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved.

Headquarters and Sales Office

SENSIRION AG Phone: + 41 (0)44 306 40 00
Laubisrütistr. 50 Fax: + 41 (0)44 306 40 30
CH-8712 Stäfa ZH e-mail:
Switzerland http://www.sensirion.com/

SENSIRION Inc. Phone: [phone]
Westlake Pl. Ctr. I, suite 240 Fax: [phone]
2801 Townsgate Road e-mail:
Westlake Village, CA 91361
USA

http://www.sensirion.com/

[e-mail]

[e-mail]

www.sensirion.com Rev.1.1 5/5

Sensirion humidity sensors and filter caps are
available from:

find your local representative at:

www.sensirion.com/reps