The Keller D-line boasts a combination of highly robust industrial pressure transducers and the I2C interface, whereas the products are now available in an intrinsically safe version, too. The D Ei series is approved for gas group II applications and can be used to measure absolute and relative pressures in zone 0. The OEM pressure transmitters form the basis for the other models with flexible pressure connections or level sensors for measuring the contents of a tank up to 3 m. The 21 D Ei 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. The D Ei series 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 resistant to environmental factors. With pressure ranges of 1 to 1000 bar and an internal two-chip solution the D Ei series is very flexible.
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