Keller 21D and 21DC series pressure sensors with RFID

The Keller 21D/DC RFID series combine industrial pressure sensing with RFID wireless communication and data logging.

The D-line piezoresistive transmitters used to measure pressure are based on Keller’s chip-in-oil technology. The laser-welded, hermetically sealed stainless steel housing, which is filled with oil for pressure transmission, contains the pressure transducer and energy-efficient compensation electronics with an I²C interface.

The Series 21D RFID passive RFID pressure transmitter has a plastic cap that houses the interface to the pressure transmitter and all RFID components, including the antenna. The scanner provides the power required to log instantaneous values.

The Series 21DC RFID data loggers are pressure transmitters that come with an extra data recording functionality. The integrated battery allows data to be measured and stored. Stored measurements are transmitted wirelessly and exclusively via the RFID interface.

Resistant to environmental impact, both models are housed in an ultracompact stainless steel housing and also available in Hastelloy C-276. They offer high accuracy and long-term stability and are hysteresis-free. They also provide a temperature reading as well as pressure in the range from 3 to 1000 bar.

The series are suitable for mining applications where the trucks run 24/7 and require preventive maintenance on the 400 bar hydraulic system every 20 days.