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In the field the sensors are quick and easy to operate using commonly available handheld devices. The Hart DDs can be downloaded onto these devices
It was only in the years that fol- lowed that the revolutionary options of digital sensor technol- ogy in terms of offline calibration were recognised. This meant that the lifetime of the pH sensors was extended many times and that by calibrating in the laboratory the error risk during calibration was reduced. Thanks to the digital technology, starting in 2006 many customers had the increasing desire to omit the transmitter and integrate the entire electronics in the sensor head of the electrode. For economic and technological reasons this remained a wish - until today.
Intelligent sensors
SMARTSENS sensors are 2-wire sensors featuring 4...20 mA Hart 7 communication – the fieldbus remains dominant in 2013 due to its widespread installed base – and IECEx certification for Ex- Zone 0. With its IECEx II 1G ia IIC T4-T6, Zone 0-2 certification class, the SMARTSENS pH sensor can be used in Zone 0. The IECEx certification is the most comprehensive of all and con- tains the criteria for Atex, Nepsi, FM and CSA.
The first step includes sensors for the parameters pH, ORP and conductivity, followed by other parameters. Especially designed for hazardous environments and hygienic operating conditions, SMARTSENS sensors are equally suited to other industries.
Safety along the measuring chain With the 4…20 mA Hart 7 com- munication, SMARTSENS sensors
also have a true open standard: they can be connected directly to the master display using stan- dard cable. The sensors are oper- ated with today's customary handheld devices. The Hart DDs can be downloaded onto these devices. In addition to Pactware, SMARTSENS sensors can also run with common asset manage- ment systems such as Emerson (ASM), Siemens (PCS7), ABB, Smar, Invensys, Honeywell, Schneider and others. With the existing sensor base, SMART- SENS sensors can be used with- out problem anywhere the installed base is VP or Sixplug. Handling and installation have been kept as simple as possible, the connector makes it impossi- ble to incorrectly connect the wires.
Sensors offer bi-directional communication
The sensors can also be calibrated offline. In this case, Krohne uses a special open standard: through the Smartbridge Hart-USB cable the sensors are provided with power directly from the PC during calibration and can use this connection to communicate bi-directionally with the PC. The user interface for offline calibra- tion is the frame application Pactware, which complies with the FDT/DTM standard.
Krohne Enter 210
34-38 Rutherford Drive Park Farm Industrial Estate Wellingborough Northants NN8 6AE T: 01933 408518 E:
info.uk@
krohne.com www.krohne.co.uk
Process & Control JULY/AUGUST 2013 Enter 19
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