Introducing the Keller Intrinsically safe D-line; a unique combination of robust industrial pressure transducers and the popular I2C microcontroller interface for use in hazardous industrial applications (Gas Group II). Pressure transmitters with this interface are typically available only in consumer-grade plastic or ceramic housings, where only compensation parameters are stored in integrated memory. The Keller intrinsically safe D-Line , however, have unprecedented embedded digital signal conditioning core for both the compensation and normalization of the output values.
The easiest way to couple an OEM pressure transmitter to a microcontroller based system is a digital I/O-compatible interface; no amplification, no analog to digital conversion, no calibration, no temperature coefficients. In short: no problems. I2C (Inter-Integrated Circuit) is designed for a direct connection between devices on a printed circuit board. It is a BUS-system because it allows the connection of multiple transmitters (slaves) to the same communication lines, but it is not a fieldbus with the classic long distance inter-connectability. So the intrinsically safe D-Line combines an industrial pressure interface for harsh environment with an electrical interface for OEM applications.
The values are in 16 Bit unsigned integer format and the scaling is given by constants or by the memory content of the transmitter (two floating point values IEEE 754 for the pressure scaling). Performance features:
- Ultra low power consumption, optimized for battery powered applications
- Hermetically protected sensor electronics–extremely resistant to environmental influences
- Ultra-compact, robust housing made from stainless steel (optional Hastelloy C-276)
- No external electronics for compensation or signal processing
- Extremely accurate, outstanding long-term stability, no hysteresis
- Pressure ranges of 1 bar to 1000 bar
- Easy to integrate into microcontroller based systems
- Internal two-chip solution with pressure sensor and signal processing separation provides a high degree of flexibility