Goodbye Transmitters! New Sensor Technology Offers Safe and Reliable Operation

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KROHNE Analytics GmbH

Krohne Messtechnik GmbH

Equipped with integrated transmitter technology, the Smartsens also offers the possibility of configuring a measurement point in zone 0. With certification class IECEx II 1G ia IIC T4-T6 compliance for zones 0 to 2, the Smartsens pH sensor is the only 2-wire pH sensor that can be used entirely in zone 0. IECEx certification is the most comprehensive of all certification tests and encompasses the criteria for Atex, NEPSI, FM, and CSA.

Direct and Open Communication

What has long been standard for flow and level meters is now also possible for analytical measurement tools. Every Smartsens sensor can be linked directly to the process control system via the 4 to 20 mA/Hart 7 signal (Namur NE 107 status messages integrated). The sensors are operated using commercially available handheld devices onto which the Hart DDs can be downloaded. This makes Krohne the first provider to offer a direct connection (Multidrop or point-to-point) from a sensor to the process control system via a standardized field bus.

The DDs and DTMs used for communication are subjected to the certification testing of the Hart Communication Foundation HCF or the performance testing routine of the FDT User Group (e.g. Pactware). Pactware is recommended as the freely available, manufacturer-independent framework application.

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The sensors that comprise the Smartsens family are also compatible with well-established asset management systems from Emerson (ASM), Siemens (PCS7), ABB, Smar, Invensys, Honeywell, and Schneider, for example.

Offline Sensor Calibration

Processing media, temperature, humidity, environmental conditions, and contamination cause electrochemical analytical sensors to lose their precision and accuracy and thus have to be recalibrated, cleansed, regenerated, and replaced as required. The majority of analytical sensors used in the field today incorporate analog technology and must be calibrated on site together with the transmitter, even if they are installed in distant locations or locations that are difficult to access and do not provide protection against weathering. On the whole, these are far less than perfect conditions for calibration and can also lead to incorrect values received by the process control system...

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