Krohne SMARTSENS 2-wire loop-powered analytical sensors

Krohne has introduced SMARTSENS, claimed to be the first family of 2-wire, loop-powered analytical sensors with integrated transmitter technology. The sensors are said to significantly reduce the risk of failures along the chain from sensor to process control system and ease the handling of analytical sensors. The first step includes the sensors for pH, ORP and conductivity, followed by other parameters.

Considering the possible sources of error by IEC 61508/IEC 61511 in the chain from sensor to process control system, the transmitter represents the main source of error by percentage. False installation, cabling or configuration of the transmitter are frequently occurring problems. To eliminate these risks, the company miniaturised the transmitter and fitted it into the sensor head - any SMARTSENS sensor can be connected directly to the process control system, featuring direct communication via 4-20 mA/HART.

Due to influences such as medium, temperature, humidity, environmental conditions or pollution, analytical sensors lose their accuracy over time and need to be calibrated, cleaned, regenerated and ultimately replaced. SMARTSENS sensors are digital sensors and can be calibrated offline in a laboratory under controlled conditions. The sensors will store the calibration data and can just be plugged in again on site. For offline calibration, the sensor can be connected directly to a PC running the same PACTware (FDT/DTM) as applied in the asset management system, using a USB interface cable for bidirectional HART 7 communication and a power supply.

The sensors are suitable for industries including chemical, pharmaceuticals, food and beverage as well as power, water and wastewater applications.