Keller has introduced its smallest fully functional digital combination transmitter for pressure and temperature – the Series 4 LD. Measuring a mere 11 mm in diameter (the same length as a worker bee), the housing contains the sensor technology, the mathematical compensation coefficients, the digital signal processing as well as the I2C interface for simple, loss-free integration into higher-level systems.
Made of stainless steel, the housing not only acts as a Faraday cage but also offers appropriate protection against electromagnetic radiation and all potential environmental influences. All the electronic components are accommodated in a laser-welded stainless steel housing filled with silicone oil. Keller’s Chip-in-Oil technology means extremely short signal paths with exceptionally high impact and vibration resistance.
Nine standard measurement ranges extend from 1 to 1000 bar (abs) with a compensated temperature range of -10 to 80°C. Accuracy is rated as better than 0,15% FS, and a total error band of less than 0,5% FS is attained between 0 and 50°C. The temperature measurement accuracy is 2 K. Transmitters in the LD series are optimised for battery-powered applications, for example, during A-to-D conversion, current consumption is 1,5 mA, dropping to 0,1 μA in ‘idle’ mode. The supply voltage range of 1,8-3,6 VDC corresponds to a normal microprocessor environment.
With a diameter of just 11 mm, the Series 4 LD is the smallest of four versions. Larger models measuring 15, 17 and 19 mm in diameter are also available for relative pressure measurements: they offer an additional temperature range (-40-110°C) without changes to the electrical characteristics.
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