This standard has been implemented since the mid-1980s and is the most popular communication protocol used today.
- Adjusting the span and range screws at the device.
- Removing the casing of the device and changing out the range jumpers on the PCB.
Establishing the type of work and determining
what you need to achieve it
With the various amounts of HART communicators available, it sometimes can be difficult to choose the correct job for the tool. For example, if a calibration technician would like to perform a pressure calibration on a transmitter, wouldn’t it be much more beneficial to have a pressure calibrator with built-in HART comms, rather than a separate communicator and calibrator?
Considerations like this will save you time and money.
Some worthwhile questions to ask yourself when choosing a viable HART communicator may be:
- Is my HART communicator flexible and can I do other tasks with it?
- Is it user friendly?
- Do I have good technical support that I can trust and rely on?
- Is there more communication protocols available like ISA100, Profibus etc.?
Don’t forget your 250 OHM Resistor!
You would be correct to think that not all communicators require a 250Ω resistor within the loop but that is not always the case. If you can, always have a couple of 250Ω resistors in your pocket just in case!
HART utilizes a frequency shift keying (FSK) modem to communicate over the primary variable analog signal wires.
By imposing the digital signal on top of the 4-20mA analog loop, HART allows for a simultaneous analog signal with a continuous digital communication signal that has no effect on the analog signal.
A minimum resistance of 230Ω is required to create an impedance with in the loop to allow for HART communication, so typically a 250Ω resistor is recommended as its easily available.
FieldMate is a PC based configuration tool that performs numerous tasks, including:
- initial setup,
- daily maintenance,
- configuration backup for device replacement.
o FOUNDATION™ fieldbus H1
Its user friendly design allows users to complete more complex tasks with confidence and ease. For example, with the ISA100 communication function, users can easily configure and provision wireless instruments in a matter of minutes which cuts down on installation and commissioning times greatly!
If you would like to find out more about what IPP can offer in terms of HART communicators, please do not hesitate to contact one of our in house product specialists.
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