![]() Can support cabling savings through use of multidrop networks.Provides important information for installation and maintenance, such as Tag-IDs, measured values, range and span data, product information and diagnostics.Is compatible with traditional analog devices. ![]() ![]() Preserves present control strategies by allowing traditional 4-20 mA signals to co-exist with digital communication on existing two-wire loops.Is supported by all of the major vendors of process field instruments.HART is the most widely used digital communication protocol in the process industries, with over five million HART field instruments installed in over 100,000 plants worldwide. Maintained by an independent organization, the HART Communication Foundation, the HART protocol is an industry standard developed to define the communications protocol between intelligent field devices and a control system. The HART protocol uses 1200 baud Frequency Shift Keying (FSK) based on the Bell 202 standard to superimpose digital information on the conventional 4-20 mA analog signal. HART stands for Highway Addressable Remote Transducer. Today, these capabilities are available in a single HART Process Calibrator that can help technicians quickly and effectively service a HART instrument workload. Historically, this operation has required two separate tools, a calibrator and a communicator. To properly service these instruments, precision analog source / measure capability and digital communication are both required. One popular digital protocol is the HART (Highway Automated Remote Transducer) protocol, which shares characteristics of both analog and digital control systems. ![]() Most new field instruments are now smart digital instruments. The field instrumentation in process plants is beginning to come under more sophisticated metrological discipline. ![]()
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