HART er en kommunikationsprotokol, der anvendes inden for procesautomation, og som overfører et analogt signal på 4-20 mA samt digital kommunikation via det samme ledningspar.
På grund af sin store globale udbredelse er HART bredt etableret inden for procesautomation.
Selvom HART-kommunikationsprotokollen er kendt for sin anvendelse til parameterisering, kan den meget mere end det. Med de rette værktøjer kan brugerne få adgang til enhedsstatus, diagnostik og information om processer med flere variabler fra både nyt og eksisterende feltudstyr. Afhængigt af den valgte arkitektur kan data fra HART-enheder integreres i styresystemer og værktøjer til anlægsstyring.
Alle enhedsoplysninger kan tilgås via et FDI-værktøj eller et FDT-frame-program. Endress+Hauser tilbyder DTM'er og EDD'er til HART-enheder og stiller filer og certifikater til rådighed i download-området for hvert produkt.
Oplev Endress+Hausers brede og veletablerede sortiment af HART-kompatible måleinstrumenter.
Measured variablesVolumetric flow a. c., volume a. c., gas velocity, Speed of sound, optional volume correction via integrated, electronic volume corrector (EVC)
Measuring MediumNatural gas (with up to 30% hydrogen), air, natural gases containing increased levels of CO2, N2, H2S, O2, H2
Nominal pipe size3 ″ ... 56 ″ (DN 80 ... DN 1400), other nominal pipe sizes on request
Number of applicationsSupport up to 4 gas or 4 liquid runs per module (Flow-X/M, Flow-X/C)
Inputs6x analog transmitter input, high accuracy Input types are 4 to 20 mA, 0 to 20 mA, 0 to 5 V, 1 to 5 V Accuracy mA inputs; 0.002% FS at 21 °C (69.8 °F), 0.008% at full ambient range of 0 ... 60 °C (32 °F ... 140 °F), long-term stability 0.01% per year Resolution 24 bits. Analog inputs share same ground floating in relation to all other electronics. 2x resolution 0.02 °C (0.04 °F) for 100 ohms input. Error depending on range 0 ... 50 °C (32 °F ... 122 °F): Error <0.05 °C (0.09 °F) or better; -220 to +220 °C (–396 °F ... +428 °F): Error <0.5 °C (<0.9 °F.) or better 4x Independent HART loop inputs, on top of 4 to 20 mA signals Support includes multi-drop for each transmitter loop, as well as support for redundant FC operation 4x Single or dual pulse input. Adjustable trigger level at various voltages. Frequency range up to 10 kHz for single and dual pulse. Compliant with ISO6551, IP252, and API 5.5. True Level A and level B implementation. 4x Periodic time input, 100μs to 5000μs. Resolution < 1ns 16x Digital status inputs. Resolution 100ns (10MHz) 4x Supports 1, 2 and 4 sphere detector configurations mode. Resolution 100ns (10MHz) 2x RS485 / RS232 serial port for ultrasonic meter, printer or generic, 115kb Flow-X/P: 4x RS485 / RS232 and 1x RS232 Flow-X/C: 2x RS485 / RS232 and 1x RS485 optional 2x RS485 / RS232 and 2x RS485 2x RJ45 Ethernet interface, TCP/IP
Outputs4x Analog output for process outputs and flow / pressure control. Resolution 14 bits, 0.075% FS. Analog outputs share same ground floating in relation to all other electronics. 16x Digital output, open collector. Rating 100mA @24V 4x Pulse outputs open collector, 0.01 to 500 Hz 1x Meter pulse output for remote proving flow computers. Resolution 100ns (1MHz) 4x Frequency outputs for emulation of flowmeter signals. Maximum frequency 10KHz, accuracy 0.1%
AccuracyClass AA acc. to IEC 60751 Class A acc. to IEC 60751 Class B acc. to IEC 60751 Class special or standard acc. to ASTM E230 Class 1 or 2 acc. to IEC 60584-2
Response timet90 starting at < 1,5 s iTHERM QuickSens depending on configuration
Max. process pressure (static)depending on the configuration
Operating temperature rangePT100 TF iTHERM StrongSens: -50 °C ...500 °C (-58 °F ...932 °F) PT100 TF iTHERM QuickSens: -50 °C …200 °C (-58 °F …392 °F) PT100 WW: -200 °C ...600 °C (-328 °F ...1.112 °F) PT100 basic TF: -50 °C ...200 °C (-58 °F ...392 °F) Typ K: max. 1.100 °C (max. 2.012 °F) Typ J: max. 800 °C (max. 1.472 °F) Typ N: max. 1.100 °C (max. 2.012 °F)
AccuracyClass AA acc. to IEC 60751 Class A acc. to IEC 60751 Class B acc. to IEC 60751 Class special or standard acc. to ASTM E230 Class 1 or 2 acc. to IEC 60584-2
Response timedepending on configuration
Max. process pressure (static)depending on the configuration up to 500 bar
Operating temperature rangePT100 TF iTHERM StrongSens: -50 °C ...500 °C (-58 °F ...932 °F) PT100 TF iTHERM QuickSens: -50 °C …200 °C (-58 °F …392 °F) PT100 WW: -200 °C ...600 °C (-328 °F ...1.112 °F) PT100 basic TF: -50 °C ...200 °C (-58 °F ...392 °F) Typ K: max. 1.100 °C (max. 2.012 °F) Typ J: max. 800 °C (max. 1.472 °F) Typ N: max. 1.100 °C (max. 2.012 °F)
Max. immersion length on request84"
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