The KELLER D-line boasts a unique combination of highly robust industrial pressure transducers and the popular I2C interface. 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 possible 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 system’s existing drilled holes: 4 LD Ei...9 LD Ei
- OEM pressure transmitters with ultraflexible 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 3 m: 26 D Ei
The OEM pressure transmitters are available in various sizes and form the basis for the other models with ultraflexible pressure connections or level sensors for measuring the contents of a tank up to 3 m. 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.
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…80°C. The hermetically sealed sensor electronics and the compact stainlesssteel housing (optional Hastelloy C276) 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.
