Archive for category HART
Changing the COM port for a USB HART modem in Pactware
Posted by danstips in Communications, Configuration, HART, Troubleshooting on November 4, 2015
Written by: Dan Weise
I couldn’t communicate with a HART device. The configuration software I was using, Pactware, thought the USB HART modem was on COM 3, while Windows’ Device Manager showed it was actually on COM 6.
To change the COM port in Pactware to COM 6, I right clicked COM 3 and selected Parameter:
Honeywell smart transmitter design makes communication card swap easy
Posted by danstips in Communications, Configuration, HART, Honeywell, Honeywell DE, Pressure Transmitters, pressure transmitters, Service, Transmitters, Troubleshooting on January 28, 2014
It was bound to happen sooner or later.
I took a call from a customer who needed to replace a garden variety differential pressure transmitter… with one exception: He needed Honeywell’s DE digital protocol for communicating to his DCS. The DE protocol is still great, but since so many installations today use HART or Foundation Fieldbus, all of our in-stock pressure transmitters had a HART communication card – a critical mismatch to what the customer needed.
A year ago, we would have been stuck rush-ordering a unit from the factory, with all the attendant delays and expediting charges, because you couldn’t swap out a comms card without making the transmitter’s hazardous approval invalid.
What could we do?
Read the rest of this entry »
LUT400 universal 4-20mA analog output gets rid of the ground loop
Posted by danweise in 4-20mA, HART, Installation, Level, Level Transmitters, Ultrasonic on August 16, 2013
Before I talk about the value of a universal 4-20mA analog output on a level controller, let me explain why anyone would care. It’s all about ground loops.
Since the early days of electronic instrumentation, way back when, even before cell phones or PCs, instrument people struggled with ground loops that create an offset error, drive the signal off scale, or burn up an analog circuit.
HART communications without busting the budget
Posted by danstips in Communications, Configuration, Cost Issues, HART, Level Technology, Service, Siemens, Software, Transmitters on March 15, 2013
The HART communication protocol has been firmly established as the standard means of configuring field instruments for some years. But talking to a field instrument needs a communicator.
There are the handheld communicators, Rosemount’s x75s and the “budget-priced” Meriam MFC 4150, but at a cost that’s more a capital appropriation than an MRO expense. Even the Meriam, with a 3-year field device description subscription starts at more than $4000.
People continue to ask me if there isn’t a more budget conscious approach to HART configuration.