FEATURE HAZARDOUS AREAS


Piezoresistive OEM pressure transmitters T


he Keller D-line boasts a unique combination of highly robust industrial


pressure transducers and the popular I2C interface. This successful series has undergone further development and an intrinsically safe version is now available too. The new D Ei series is approved for gas group II applications and can be used to measure absolute and relative pressures in zone 0.


VARIOUS COMBINATIONS FOR ALL MANNER OF DIFFERENT APPLICATIONS With its modular structure, the series permits numerous combinations, making it the ideal component for customisations using an I2C interface: • OEM pressure transmitters for fitting


directly into a sys tem’s existing drilled holes: 4 LD Ei...9 LD Ei • OEM pressure transmitters with ultra -


flexible pressure connection for screwing into existing pressure systems:20 D Ei • Pressure transmitters with a pressure


connection and cable gland: 21 D Ei, 23 D Ei • Level sensor for measuring the


contents of a tank up to a maximum fill level of 3m: 26 D Ei The OEM pressure transmitters are


available in various sizes and form the basis for the other models with ultra - flexible pressure connections or level sensors for measuring the contents of a tank up to 3m. The 21 D Ei and 23 D Ei models are


pressure transmitters with metal casings and cable outlets. Each offers a different level of accuracy, dimensions, potential applications and numbers of variants. For example, the slightly cheaper 21 D Ei


8 SPRING 2019 | INDUSTRIAL COMPLIANCE


model has a simple cable gland to relieve strain and is suited to use in dry environments, while the 23 D Ei has a premium quality cable gland boasting protection level IP 68, allowing it to be used underwater and making it ideally suited to use in flooded areas.


THE I2C INTERFACE Pressure transmitters with an I2C interface are normally only available in plastic or ceramic “consumer” housings, with only the compensatory parameters being stored in a memory. The intrinsically safe OEM transmitters from Keller, however, have their own built-in DSP (digital signal processing) core, which balances and standardises the output values. The I2C (inter-integrated circuit) interface is designed to connect elements directly on a circuit board. The I2C is a bus system in that it connects multiple transmitters (slaves) to the same communication line. For instance, the intrinsically safe D-line combines a pressure interface for industrial use in tougher environments with an electrical interface for OEM applications.


ROBUST AND FLEXIBLE IN EQUAL MEASURE The D Ei series consumes very little energy and is optimised for battery- powered applications. The total error band is just ± 0.7%FS over a temperature range of 10 to 80 °C. The hermetically sealed sensor electronics and the compact stainless steel housing (optional Hastelloy C 276) are extremely resistant to environmental factors.


With pressure ranges of 1 to 1000 bar


and an internal two-chip solution that keeps the pressure sensor separate from the signal processing, the D Ei series is extremely flexible.


Keller www.keller-druck.com


New low cost intrinsically safe steady state beacon


BEKA associates have introduced a new low cost, intrinsically safe, steady state beacon which complements their well established intrinsically safe flashing beacons. The new steady state BA386S beacon is available with a bright red, amber, green, blue


or white continuous output. It has an IP66 enclosure with an internal brightness control and is ideal for hazardous area process or machine status indication. This new BA386S steady state beacon has IECEx, ATEX


and FM Ex ia certification and may be powered from most certified 24V Zener barriers, galvanic isolators or certified associated apparatus. It may be installed in all Zones and used with most common hazardous area gases. If slightly less brightness is acceptable, a further cost


reduction can be achieved by powering two BA386S steady state beacons from one Zener barrier or galvanic isolator. For further information including datasheets and certificates


please visit https://www.beka.co.uk/steady_state_beacon or phone the BEKA sales office on 01462 438301.


BEKA associates www.beka.co.uk / INDUSTRIALCOMPLIANCE


The new D Ei series is approved for gas group II applications and can be used to measure absolute and relative pressures in zone 0


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