Fieldbus transmitter must also be calibrated Mr. Juha Salimaki

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1 Fieldbus transmitter must also be calibrated Mr. Juha Salimaki Area Sales Manager, Country Manager - India Beamex Oy, Finland

2 Contents 1. What is calibration 2. Why calibrate 3. The operation of fieldbus transmitters 4. Fieldbus transmitters must also be calibrated 5. The principles of calibrating fieldbus transmitters 6. Conventional way of calibrating fieldbus transmitters 7. New solution - Calibrating fieldbus transmitters with a Beamex MC5

3 What is calibration What time is it? What time is it exactly and how do you know it? Calibration can be briefly described as an activity where the instrument being tested is compared to a known reference value. The keywords here are known reference, which means that the known reference used in the comparison should be traceable to some standard. Terminology differs between conventional and digital instrument calibration.

Why calibrate The primary reason for calibrating is that even the best instruments drift and lose their ability to give accurate measurements. The drift makes calibration necessary.

4 Why calibrate The primary reason for calibrating is that even the best instruments drift and lose their ability to give accurate measurements. The drift makes calibration necessary. Environment conditions, elapsed time and type of application can all affect the stability of an instrument. Even instruments of the same manufacturer, type and range can show varying performance. One unit can be found to have good stability, while another performs differently.

Other reasons for calibration To maintain the credibility of measurements. To maintain the quality of process instruments at a good-as-new level. Safety and environmental regulations.

5 Other reasons for calibration To maintain the credibility of measurements. To maintain the quality of process instruments at a good-as-new level. Safety and environmental regulations. ISO9000, other quality systems and regulations (e.g. FDA). ISO9000 and ISO14000 can assist in guiding regular, systematic calibrations, which produces uniform quality and minimizes the negative impacts on the environment.

6 The operation of fieldbus transmitters Conventional transmitters Control System Analog one-way signal Only one variable A pair of cable to each instrument Conversion of ma signal to digital for I/O subsystems I/O SUBSYSTEM 4-20 ma 4-20 ma 4-20 ma PT- 101 PT- 102 CV-101

7 The operation of fieldbus transmitters Fieldbus transmitters Digital two-way signal Control System HOST-LEVEL NETWORK (Profibus DP, Foundation HSE, etc) Huge amount of information is transferred Several instrument in one bus cable (multi-drop) No conventional I/O systems needed Open standard Instruments from any manufacturer can be in the same fieldbus SEGMENT CONTROLLER FIELD-LEVEL NETWORK (Profibus PA, Foundation Fieldbus H1) PT-101 FT-101 CV-101

Fieldbus transmitters must also be calibrated The main difference between a fieldbus transmitter and conventional transmitters is that the output signal is a fully digital fieldbus signal.

8 Fieldbus transmitters must also be calibrated The main difference between a fieldbus transmitter and conventional transmitters is that the output signal is a fully digital fieldbus signal. Changing the output signal does not change the need for periodic calibration. Although modern fieldbus transmitters have been improved compared to older transmitter models and some manufacturers gives assurance of drift-free instruments, it does not eliminate the need for calibration. Calibrator is needed to measure (generate) input + a way to read the digital output Process Pressure, Temperature, Voltage, Current, Pulse, Resistance, etc Fieldbus transmitter Digital Output

9 The principles of calibrating fieldbus transmitters In brief: Generate accurate process input Read FF output Document results Trim (adjust) if required Calibration CANNOT be made remotely e.g. from the control system, etc. Process Pressure, Temperature, Voltage, Current, Pulse, Resistance, etc Fieldbus transmitter Digital Output

10 Conventional way of calibrating fieldbus transmitters Minimum two persons often required Various measuring instruments needed Manual documentation of calibration Doesn t work for stand-alone transmitters Fieldbus Process Automation and Configuration System FIELD CONTROL ROOM

11 New Solution In year 2006 Beamex introduced its revolutionary and awarded World s First Fieldbus Calibrator. Till to date no other calibrator manufacturer has been able to introduce anything similar to the MC5 Fieldbus Calibrator It is a combination of multifunction process calibrator and a fieldbus configurator, which can be used with both industrial standards Foundation Fieldbus H1 and Profibus PA

12 Calibrating fieldbus transmitters with the Beamex MC5 Fieldbus Calibrator 1. Make connections (live segment or stand-alone) - View/edit instrument configurations - Verify the instruments during commissioning 2. Calibrate and document automatically - Simulate or generate the input and read the digital output of the Fieldbus instrument 3. Trim (adjust) if required and perform As Left calibration automatically or manually 4. Upload calibration results to calibration software and print the calibration certificate

13 Thank You KIITOS!

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