Posts Tagged ‘New’

Keller LevelRat keeps getting better!

Wednesday, October 14th, 2015

rencontrer capucine anav
prostituée salou
wazami rencontre gratuite
site rencontre pour ado marseille
pierre de rencontre donjon de la tempete
rencontre de gaulle staline
tu rencontres une personne accidentellement puis elle devient une grande partie de ta vie
rencontre jason médée
forum de rencontre emo
paru vendu rencontres femmes
petite annonce rencontre olx
site de rencontre serieux a maurice
prochaine rencontre ligue 1 foot
rencontre femme de luxembourg
a chacun son histoire prostituee
question a poser premiere rencontre
rencontre celibataire moselle
prostituee dijon
badoo site de rencontre en algerie
rencontre musulmane net forum login
prostituee ploermel
emission rencontre a 15
rencontre augc 2014
teen prostitutes foster care
rencontre ploemeur
forum site rencontre edarling
site de rencontre pour ado gratuit sans inscription
site de rencontre serieux non payant en tunisie
ergo prostituee
lieux rencontres auxerre
rencontrer jk rowling
site de rencontre geneve gratuit
rencontre prescrire 2012
video rencontre a xv
petite annonce rencontre marseille
soiree rencontre celibataire toulouse
blague hollande discute avec trois prostituées
association point rencontre sion
mars et venus se rencontrent pdf gratuit
rencontres arles 2011 site officiel
question de corpus sur la rencontre amoureuse
prostituée parc de sceaux
rencontre natureparif
prostituée curiol
petites annonces rencontres eure
site de rencontre angleterre gratuit
rencontres bron
faire part mariage site de rencontre
rencontre chorégraphique 2013 aurillac
rencontre célibataire 50 ans
site de rencontre gratuit hug
site de rencontre amoureuse non payant
rencontre st mammes
rencontre comptable
cocktail rencontre
site de rencontre fly
slogan rencontre amoureuse
conjugaison rencontrer imparfait
rencontre tunisienne belgique
prostitute awailable in oman
blague sur les sites de rencontre
meet luneville
rencontre foucarmont
site de rencontre efficace 2012
nabilla rencontre kim
rencontre de jeunesse 2011
programme rencontre musulmans france 2010
rencontre pour quarantaine
smack site de rencontre
vivastreet languedoc roussillon rencontres
rencontre gratuite en nouvelle caledonie
rencontre tenneville
rencontre homme suede
stone age rencontre
nej prostitute
terre de rencontres blagnac
sit rencontre reunion
rencontre jane yolen
http marineland rencontre avec les animaux dauphins
location t2 bon rencontre toulon
site de rencontre moldova
percentage prostitutes hiv
rencontre sur internet avis
rencontre royal sarkozy
site rencontre pour sortir soir
elle refuse de me rencontrer
rencontre informelle
rencontre jeunesse 2011
vacances rencontres
theatre rencontre bordeaux
prostituée pas cher rouen
rencontre lurcy levis
petites annonces rencontre ouest france
site de rencontre reconnu
meet gonesse
script cms rencontre
nabila prostituee
site de rencontre b2
rencontre digne les bains
rencontres de la géographie et de la sociologie
prostituée mongole
rencontre de tilsit
citation rencontre montagne
badoo rencontres belgique
combien coute une prostituee amsterdam
dsk confronté à une prostituée
rencontre rabat
rencontres femme bienne
faire des rencontres traduction espagnol
site de rencontre nord pour ado
eduardo manet quand deux dictateur se rencontre
site de rencontre sans abonnement
programme cinema maison de la rencontre ecully
6e rencontre annuelle des musulmans du nord ramn
prostitute photos in england
prostituées vietnam
rencontres parlementaires sur la route et la sécurité routière
rencontres anglophones paris
rencontre julien gracq
site rencontres entre gens mariés
journal rencontres intimes
rencontre européenne de taizé
amitie rencontre france
site rencontre animaux
uoif rencontre musulman
rencontres autopartage
meilleur club rencontre
rencontre en ligne dvd
prostitute suit fable 3
rencontres de fès
rencontre gold
rencontre fille sambava mada
rencontre toxicomane
hoeveel prostituees in amsterdam
point rencontre médiation familiale châteauroux
prostitute catcher in the rye
se rencontre verb
site de rencontre pour musulman en france
rencontre sans enregistrement
rencontre la plaine sur mer
admin rencontre
sonnerie telephone rencontre du 3eme type
maktoub site de rencontre
cuba rencontres femmes
comment faire rencontres lausanne
maiko nouvelle rencontre skyrock
le support rencontre com
faure rencontre pdf
rencontre femmes cubaines
rencontres internationales des jeunes pianistes 2012
femme marocaine de casa pour rencontre
rencontre gestionnaire
site de rencontre gratuit belge
types de rencontres extraterrestres
chat pessac
maroc rencontre ma
uoif 29 eme rencontre
rencontre tilff
faire des rencontres amicales sur dijon
chan irc de rencontre
yvain rencontre lion
site de rencontre entre plongeur
rencontres par affinités astrologiques
review camping rencontre du soleil
notre rencontre lettre
jacqueline voillat rencontre avec la nuit
citations sur les belles rencontres amicales
chat land rencontre gratuit
lieux de rencontres aube
romain bertrand rencontres impériales
france culture les rencontres de pétrarque 2012
tous les sites de rencontre gratuites
se demarquer sur les sites de rencontres
rencontre femme chatillon
site rencontre comme meetic
site rencontres 40 ans et plus
site de rencontre pour converti musulman
rencontres campusfrance 2012
agression prostituée grenoble
site de rencontre en ligne
site de rencontre marche pas
gare du nord bruxelles prostituées prix
club rencontres jura
site de rencontre languedoc roussillon gratuit
rencontre de femmes marocaines
type de description pour site de rencontre
rencontre femme neuilly plaisance
rencontre gujan mestras
prostituees keulen
salon livre montreuil rencontre da
chat rencontre herisson
tchate rencontre serieuse
concours rencontre avec tokio hotel
rencontre tarot free
meilleur site de rencontre gratuit 2011
rencontre avec joe black vod
la nuit des rencontre
site de rencontre français de souche
rencontres spirituelles québec
une rencontre troublante kate walker

OEM Transmitters : All-inclusive

Tuesday, July 8th, 2014

By Daniel Hofer, Dipl.EL.-Ing FH and Bernhard Vetterli, Dipl, Dipl.El.-Ing.HTL

Miniaturization in pressure measurement technology

Keller’s OEM transmitters are systems that can be described as “embedded” in the best sense of the word – and in two different ways. First the sensor and the downstream electronics are embedded in the same housing. And second, the transmitter capsules themselves are ideally suited for embedding in application-specific systems. Depending on requirements, the output signal is standardized and temperature-compensated (ratiometric or digital).

Thanks to Chip-in-Oil (CiO) technology developed at Keller, the trend toward sensor miniaturization is now a reality. This development can offer impressive advantages: an extremely compact structural design, high resistance to electrical noise fields, and high vibration resistance thanks to low mass and short conduction paths.

To put it clearly, CiO technology means that an ASIC is fitted directly next to the pressure sensor – in the same housing – to provide users with a whole range of beneficial functions. However, this does not make the pressure measurement capsule any larger;  Its external dimensions remain the same. This transmitter concept is available in housings 4L…9L, starting from a diameter of 11mm.

Sintered-in pressure-resistant glass lead-throughs feed the transmitter signals outward. The internal Wiring uses short, lightweight bonding wires – with the total exclusion of air in oil. First, this approach eliminates the need to connect filigree signal processing boards with multi-wire cabling in the rest of the installation process for the pressure transducer. And second, there is no need to protect the downstream electronics against moisture and condensation.

Together with the high-grade steel housing, the glass lead –throughs act as feed through capacitors, forming a Faraday cage. This makes the CiO technology extremely resilient to electrical fields. Even field strengths of 250V/m at frequencies of up to 4GHz are unable to influence the measurement signal. The digital interface must be protected by the equipment manufacturer itself.

The ASIC is designed as a microcontroller with the corresponding peripherals, so the sensor signals can be registered with high resolution and dynamism. In addition to the process pressure as such, the temperature of the pressure sensor is measured and is used for mathematical compensation when the signal is processed.

OEM transmitters supply two signals: a ratiometric analog voltage output and a digital inter-integrated circuit interface (12C).

Ratiometric output signal

The secret of the ratiometric format to the output signal is that it actually has no format at all, because it depends on the voltage supplied. This is an inestimable advantage for applications in integrated systems. If the analog-to-digital converter downstream of the transmitter is operated with the same supply voltage, the digital measured value will always be correct. This is because the height if the digitization steps depend on the voltage supply, but the number of steps does not – and their number is the critical factor. Using ratiometric signals substantially reduces the outlay on passing signals from the pressure transmitter to the A/D converter in the downstream electronics, and calibration steps are unnecessary; in the specific case of connection to a microcontroller with an integrated A/D converter, this outlay equals zero. Nevertheless, an interval is specified for the output signal, i.e. 0.5…4.5V for s supply voltage of 5.0V. With a stable and precise supply voltage, this interval can also be used directly as the “standard signal.” The sampling rate of 2 kHz offers amazingly good dynamic scope for a product based on the AD/DA principal. Moreover, the embedded electronics in CiO technology provide constant protection against overvoltage and polarity reversal on all lines up to ±33 VDC.

Embedded interface I2C

OEM transmitters that are the same size as pressure measurement capsules are never connected directly to field bus systems. Instead, the respective coupling modules have corresponding input interfaces, e.g. for the inter-integrated circuit or I2C interface. For years, this has been the serial standard to cope with short distances in embedded systems. The I2C master needs two lines for the serial data and the pulse (clock) for synchronous sampling. Consequently, no timing requirements are specified for the master – which, in fact, determines the timing. Each OEM transmitter has its own address, which is addressed by the I2C master. In the existing configuration, one master could manage 128 different addresses. The pressure and temperature values are registered by means of a request from the master, and are then available at the transmitters (slaves) after less than 10ms, so that they can be clocked out according to a specified protocol. The values are temperature compensated and standardized, and they only need to be scaled from the 15-bit integer to a pressure and/or temperature with units.

Mobile Application

Unlike the CiO version with the ratiometric output, CiO versions with I2C output can operate with a voltage supply of only 1.8…3.6 VDC, so they are excellently prepared for mobile battery-powered applications. In this case, however, features also include the short conversion time of less than 10ms (during which a mere 1.5mA is drawn) and the excellently optimized Sleep mode: unless they are polled, the transmitters remain in this mode, which is typically specified as 0.1µA. If the master allows suitable fast communication, 100 samples per second can be therefore be attained.

OEM transmitters for Everyone

Typical key data vary according to the format of the output signal – ratiometric or digital. With an analog output, the transmitter can be used at temperatures between -40°C and +150°C, whereas the I2C output is subject to an upper limit of 80°C. The pressure range for the analog version extends from 2 bar to 1000 bar; for the digital version, the range is from 2bar to 200 bar. For a greater dynamic scope with increased power consumption up to a maximum of 8mA, the analog version should be chosen. For low voltage and low power applications, the digital version (which also provides temperature information) is recommended.


Keller’s C-series OEM transmitters herald a new chapter in the history of high-integration pressure measurement technology. The Chip-in-Oil concept moves signal processing directly into the protective oil-filled pressure measurement capsule housing, made of stainless steel. Linearization, temperature compensation and parameterization are handles here. For integration into higher-level systems or battery-powered devices, versions are available with ratiometric voltage output or with a serial-digital I2C interface. Various structural designs can be supplied depending on the specific application.