1. Calibrating and Trimming Instruments via HART Agenda: What is HART? / History / Signal / Message Frame HART Command Structure Connecting a HART Transmitter Trimming Devices Trimming Conventional Transmitter vs. HART Transmitter Live Demo

2. What is HART? HART = Highway Addressable Remote Transducer A digital communication protocol designed for industrial process measurement applications. Uses a low-level modulation (FSK) superimposed on the standard 4 to 20 mA current

3. HART History RevisionYear 2.01987 3.01988 4.01989 5.x1989– still delivered today 6.02001 – never introduced 7.02007 – introduction of HART wireless

4. HART Signal

5. HART Message Frame

6. HART Command Structure Three levels of commands Universal commands Common practise commands Device Specific commands Universal commands Model ID Tag ID Description Message Date Range Values Instrument Limits Process Measurements Device Status Common practice commands Read Variables Calibration (zero, span) Initiate Self Tests Serial Number Time Constant Values Device Specific commands Model Specific Functions Start, Stop, or Clear Totalizer Select Primary Variable Special Calibration Options PID - SP, Tuning, Etc.

7. Connecting a HART Transmitter Point-to-point 24V supply + _ Resistor Transmitter HART Communicator mA Polling address = 0 ! => HART + mA signal HART

8. Connecting a HART transmitter Multidrop 24V supply + _ Resistor Transmitters (max 15 pcs), fixed 4 mA current, Only PV output, different addresses (not 0 !) HART Communicator 4 mA (fixed)... Addr=1215

9. Trimming Devices CommunicatorsSmart Calibrators

10. MC5 Internal Connections 24V supply + _ Resistor Transmitter HART Communicator mA MC5 +24V Ground HART

11. HART vs. Conventional Transmitter (1of 2) Conventional transmitter Input4 … 20 mA Adjustments: Zero Span

12. HART vs. Conventional Transmitter (2 of 2) HART transmitter Input4.. 20 mA Digital trimAnalog trim Range Transfer Function PV Input sectionOutput sectionConversion AO A/DD/A

13. Live Demo Presented by: Ned Espy – Consulting Director Beamex, Inc. Office: 770-951-1927 Mobile: 404-386-8158 ned.espy@beamex.com www.beamex.com