Archive for category Pressure transmitters

Honeywell smart transmitter design makes communication card swap easy

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 »

, , , , , , , , ,

Leave a comment

Wet rhymes with Set (or how to remember LRV/URV configuration prompts)

Lots of people like the pushbuttons on industrial pressure transmitters because the basic settings that every transmitter needs can be set up without a HART communicator. This includes things like the tag name, engineering units, LRV (Lower Range Value, the zero, or what 4.0mA represents), URV (Upper Range Value, the span, or what 20.0mA represents) and damping (an average or filter factor that dampens noise).

Honeywell ST700 ST800 configuration screenOn the new Honeywell ST700/ST800 series smart transmitters, the tag name and engineering units are easy to configure and self explanatory, but I seem to stumble when setting up the LRV and URV because I’m faced with a non-descript choice. There’s two sets of options (under Transmitter Setup, not Calibration):

Enter LRV
Enter URV
Set LRV
Set URV

OK, either configures an LRV or a URV value, but which is which?  What’s the difference?

Read the rest of this entry »

, , , , , , ,

Leave a comment

Comparing Honeywell smart transmitters

Honeywell ST800 Smartline TransmitterHoneywell’s new SmartLine ST700 and ST800 pressure transmitter lines are replacing the existing ST3000 100 and 900 series.

If you’re using ST3000 100 series transmitters, you’ll be looking at the ST800 for future units.  If you’re using the ST3000 900 series, the ST700 will be your better fit.

Read the rest of this entry »

, , , , ,

Leave a comment

How can I keep the water out of my transmitters in washdown conditions?

Earlier this week, I took a call from a customer having problems with his pressure transmitter.  He’d figured out that his last transmitter, installed in an area with nearly continuous wash-downs, had failed because of water intrusion.  The bigger problem was that it wasn’t coming from a loose cover, a conduit pipe, or a leaky conduit connection.  In his case, the water came into the transmitter through a vent hole and messed up the measurement cell electronics.

So he asked me to recommend a 3000 PSI transmitter that could survive the washdown conditions.

Read the rest of this entry »

, , , , , , , , , , , , , , , ,

Leave a comment

Follow

Get every new post delivered to your Inbox.

Join 173 other followers

%d bloggers like this: