Stern/Stern-Engineer-html.html

HMI

Human Machine Interface (HMI) technology has been

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the demands of specialized applications across the
industries.

Electromechanical devices in all their variety,
including switches, keypads and keyboards became
critical points for controlling equipment and
systems.

Safety  regulations,  raising  standards  for  hygiene,
durability  and  ergonomics  have  drawn  industrial
designers  to  choose  from  low-power,  interactive,
solid metal piece piezo switches and keypads that
perfectly meet the demands of industrial, medical,
hygienic, anti-vandal and wash-down applications.

Technology’s low currents, little or no arching or
welding make piezo an explosion-proof, safe choice

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other hazardous areas.

Manufacturers like Stern Engineering conduct series
of researches and tests to ensure the right quality
of their piezo products and strive to comply with
the most recent International standards in industry.

Constant  investments  in  R&D,  product  line
development  and  production  lines,  ensure  the
strong  position  of  Stern  Engineering  among  the
leading manufacturers of HMI solutions.

Worldwide, Stern SMARTSWITCH customers enjoy

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with personal customer approach and tailor-made
services.

ABOUT THE COMPANY

Stern Engineering Ltd. was founded in 1989 and
is a leading manufacturer of electronic faucets,

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The company is a recognized pioneer in designing
eco-friendly, innovative and durable products in
quality and look.

Stern Engineering group delivers products and

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Our expertise in engineering and project
management allows us to design custom made
products that meet the requirements of the
most selective customers.

Leading by example, Stern Engineering uses piezo
products in manufaturing it’s branded electronic
faucets and electronic sanitary valves:

www.sternfaucets.com

Stern  Engineering  products’  perfection  is  ensured
by  quality  control  over  all  phases  of  production.
Full in-house manufacturing both ATEX and  ISO9001

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lines:
• CNC machining center
• SMT assembly lines
• Epoxy coating lines
• Piezoelectric switches & panels full production line
• Electronic tests facilities
• In-house R&D
• Quality assurance and control

PIEZO TECHNOLOGY

Piezo technology is a reliable and proven meachnism
used in many high-tech applications and products.
It is based on the ability of piezoelectric crystals to
generate low-voltage electric potential in response
to the applied mechnical stress.

Piezo  and  reverse  piezoelectric  effects  are  used
in  printing  equipment,    ultrasonic  transducers,
fuel  injectors,  acoustic  equipment,  laser  mirror
alignment and piezoelectric devices.

In HMI solutions, low voltage piezo actuators
activatied by touch generate 300mA or 1.5A pulse,
which is then converted to the desired electrical
output. For basic momentry action performance, a
piezo switch or keypad requires no external power
supply.

STANDARDS IN INDUSTRY

Essential components of HMI interfaces, switches,

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requirements imposed on the whole systems, and
full consideration must be given to the environment

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cleaning  solutions,  fuel  or  other  liquids  may
come into contact with switches or control panels
it  is  important  to  select  components  with  an
appropriate rating for environments protection and
explosion  proof.  A  number  of  ratings,  introduced
to  the  industry,  allow  to  standardize  the  products
according to their behavior in different conditions.

INTERNATIONAL PROTECTION (IP) RATING

Often refered to as “Ingress protection”, this
widely popular standard is mainly used in Europe

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by the IEC standard 60529. The IP code designation
consists of the letters IP typically followed by two

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protection against the solids. The highest rating in
this  system  is  IP6x  which  stands  for  ‘dust  tight’.
The second digit indicates the degree of protection
against  liquids  of  various  pressures,  volumes  and
directions,  where  IPx6  stands  for  powerful  water
jets,  IPx7  for  immersion  up  to  1  m  and  IPx8  for
immersion  beyond  1m.  An  expansion  to  IP  rating
is  provided  with  an  additional  rating  IP69K  as  per
DIN 40050-9. Under this rating, devices can undergo
high-temperature  and  high-pressure  impacts  up

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minute. IP rating corresponds with NEMA ratings in
the USA. For example, IP68 rating is associated with
NEMA 6P type. STERNSWITCHES products are IP68 or
IP69K rated, and can be used in most applications.

KEY FEATURES

- Solid metal housing ensures IP69K sealing protection;

- No external power supply required for Basic Piezo Switches, results in less energy consumption;

- No moving parts, over 10 mln cycles with minimum maintenance;

- Illumination and sound feedback allow smart interactivity;

- NO (normally open), NC (normally closed) or toggle piezo switches available;

- Momentary or prolonged impulse up to 6 sec for a variety of applications;

- Laser engraving and color print for product customization;

- Low operation hight and antivandal mounting.

SMARTSWITCH PRODUCT SERIES DESCRIPTION

Piezo switches, keypads and keyboards designed and manufactured by Stern Engineering offer high

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alike.

They provide an unprecedented level of durability, lonigivty, hygiene, aesthetics and interactivity when
compared with non-piezo switches. Having no moving parts, and with all electronic components molded
within a one-piece metal housing, SMARTSWITCH products are completely solid and water proof, can be
used in agressively polluted environments and in wash-down applications as well as in vandalism endangered
surroundings.

International Protection ratings for SMARTSWITCH products are IP68 and IP69K, according to the results of
temporary Immersion test, Low pressure test, High Temperature tests, Shock operational test, and Random
vibration test all done by an independent laboratory.

Stern Engineering continuously invests in research. All products apply a unique technology that allows
better conductivity between the piezoelectric disk and electronic circuit, eliminating the risks of electrical
pulse loss, and prolonging products life.

SMARTSWITCH line includes illuminated and non-illuminated switches, momentary, prolonged or toggle
switches, keypads and keyboards that address the needs of any application.

Housing material is typically stainless steel or anodized aluminum, available in variety of colors. Brass in

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STERN SMARTSWITCH PRODUCTS ARE IMPLEMENTED WITHIN THE FOLLOWING INDUSTRIES:

• Food processing and packaging equipment

• Car wash and pressure washers

• Mining Equipment

• Automatic parking and ticketing machines

• Medical and pharmaceutical equipment

• Oil rigs and off shore equipment

• Access control systems

• Gas & Fuel equipment

• ATMs and Automatic Vending machines

• Industrial controls and HMIs

• Industrial scales and weighing systems

APPLICATIONS MATRIX BY FEATURES AND STANDARDS

FEATURE / STANDARD

IP68

ANTI-VANDAL, IP69K

Illumination

Car wash stations

Parking ticketing machines

Sound indication

Scales and weighing systems

ATMs, Vending machines

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Marine, yachts

Vending machines

Momentary activation

Food processing equipment

Private label equipment

Toggle switch

Machinery

Lockout time

Clean rooms

Elevators, escalators

ELECTRICAL FUNCTIONS

BPS switches do not require an external power supply, except for those with LED illumination. In
that case, a power supply of 9-24 VDC/VAC is required.

BPS: ORDER CODE DESCRIPTION

LED

Illumination

Surface

Power

supply

Finish

Mounting Ø

Output

Series

Material

BPS

Basic Piezo

Switch

AISI303 Stainless

steel

Natural

Ø12

Pulse 0.3 sec

at 1A

Non illuminated

Flat

Voltage 9 VDC

/ VAC

Aluminum

Red

Ø16

Pulse 6 sec at

0.3 A

Red

Recessed

Voltage 12 VDC

/ VAC

Blue

Ø18

Pulse 0.3sec

for IR

Blue

Voltage 24 VDC

/ VAC

Green

Ø19

60V 1.5A 0.3sec

Green

Customized

Yellow

Ø22

Yellow

Black

White

Satin

Orange

Green-Red

Blue-Red

Red-Yellow

Blue-White

Chrome

Brass

FOR

ALUMINUM

ONLY

FOR BRASS

ONLY

EXAMPLE

B P S S N 2 2 P B F E 0

SWI

BPSSN22PBFE0

APS - PROGRAMMABLE PIEZO SWITCHES

Programmable piezo switches can be programmed for continued pulse, allow preset operation time, conduct timer
based operations, lockout devices or equipment. They allow smart integration into the most sophisticated solutions.

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power supply of minimum 6VDC for non-illuminated switches and 9, 12, 24VDC for illuminated switches.

ORDER CODE DESCRIPTION

LED

Illumination

Surface

Power

supply

Finish

Mounting Ø

Output

Series

Material

APS

Programmable

Piezo Switch

AISI303 Stainless

steel

Natural

Latch 6VDC

Non illuminated

Flat

Voltage 12 VDC

Aluminum

Red

Non-latch

Red

Recessed

Voltage 9 VDC

transformer

Blue

Latch 9VDC

Blue

Voltage 9VDC

battery

Green

Ø19

Green

Voltage 12 VDC

Yellow

Ø22

Yellow

Black

White

Satin

Orange

Green-Red

Blue-Red

Red-Yellow

Blue-White

Chrome

Brass

FOR

ALUMINUM

ONLY

FOR BRASS

ONLY

EXAMPLE

A P S S N 2 2 L B F C 0

SWI

APSSN22LBFC0

Voltage 24 VDC

/ VAC

Customized

TPS - TOGGLE PIEZO SWITCHES

Toggle piezo switches are available with NO and NC functions.

ORDER CODE DESCRIPTION

LED

Illumination

Surface

Power

supply

Finish

Mounting Ø

Output

Series

Material

TPS

Toggle piezo

switch

AISI303 Stainless

steel

Natural

Non-latch

Non illuminated

Flat

Voltage 24 VDC

/ VAC

Aluminum

Red

Ø16

Red

Recessed

Voltage 9 VDC

Blue

Ø18

Blue

Voltage 12 VDC

Green

Ø19

Green

Customized

Yellow

Ø22

Yellow

Black

White

Satin

Orange

Green-Red

Blue-Red

Red-Yellow

Blue-White

Chrome

Brass

FOR

ALUMINUM

ONLY

FOR BRASS

ONLY

EXAMPLE

T P S S N 2 2 P B F C 0

TPSSN22PBFC0