Air Monitoring

  • Encapsulated digital OEM pressure transmitter no larger than a bee

Encapsulated digital OEM pressure transmitter no larger than a bee

Oct 28 2020 Read 516 Times

The smallest fully functional digital combination transmitter for pressure and temperature currently available on the market has now been launched by KELLER AG für Druckmesstechnik. In the LD series from Keller, all the electronic components are accommodated in a laser-welded stainless steel housing filled with silicone oil. Measuring a mere 11 mm in diameter (the same length as a European worker bee), the housing contains the sensor technology, the (mathematical) compensation coefficients, the digital signal processing and − finally − the I2C interface for simple, loss-free integration into higher-level systems. 

Made of stainless steel or Hastelloy, the housing not only acts as a Faraday cage but also offers appropriate protection against electromagnetic radiation and all potential environmental influences. Thanks to the Chip-in-Oil technology developed by Keller, extremely short signal paths with exceptionally high impact and vibration resistance are realised. 

Nine standard measurement ranges extend from 1 to 1000 bar abs. with a compensated temperature range of -10 °C…+ 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…50 °C. The temperature measurement accuracy is ± 2 K. 

Transmitters in the LD series are optimised for battery-powered applications: e.g., 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 mm, 17 mm and 19 mm in diameter are also available for relative pressure measurements: they offer an additional temperature range (-40 °C…+ 110 °C) without changes to the electrical characteristics. 

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment





Digital Edition

Asian Environmental Technology November 2020

November 2020

In This Edition Business New - Acquisition to combine French expertise for moisture analysis in gas - ASTM International Water Committee developing proposed contaminate monitoring standard...

View all digital editions

Events

Asia Water 2020 - NEW DATES

Nov 30 2020 Virtual event

Oceanology International 2020 - NEW DATES

Dec 01 2020 Virtual event

Valve World Conference & Expo 2020 - CANCELLED

Dec 01 2020 Dusseldorf, Germany

Biogas Convention 2020

Dec 08 2020 Virtual event

View all events