danweise

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LUT400 universal 4-20mA analog output gets rid of the ground loop

The Problem
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.

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Honeywell TrendManager Suite software is Windows 7 compliant

TrendManager Suite is Windows software for Honeywell’s Trendview paperless recorders, which includes the licensed TrendManager Pro (TMP) and Trendserver Pro (TSP) software and the freeware Trendviewer.

The latest release, version 6.1.38.0, has revisions to the installer that makes the version Windows 7 compliant.   Earlier versions had issues trying to run under Windows 7.   For download and installation details, read further. 
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What are DIN size panel cut-outs?

Instrument DIN cutout sizes in inches and millimeters

Years ago, instrument manufacturers adopted the DIN standard for panel mounted instruments, with standardized panel cutout dimensions for controllers, recorders, and other boxed mechanical devices.

And while the cut-outs are a standard size, the area occupied by the instrument’s bezel, its footprint, is not. Some bezels extend quite far beyond the cut-out, others barely extend beyond the cutout. 

So, you need to pay attention to both the cutout and bezel specs when you’re planning a first-time install or a replacement upgrade. A designer who lays out a panel needs to be aware of how close one panel mounted instrument can be to another.

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Using a Honeywell loop controller as a manual station

Industry statistics reveal that a fair percentage of control loops are controlled manually, and are not automated.   This fact was brought home last week, when a caller told us he needed “something to adjust the valve position so that the valve stays where it’s been set.  And it’s real important that it can’t accidentally go off its own”.   

What he was describing is what we call a manual station.   It’s a controller where the 4-20mA current output stays fixed where it is until someone pushes buttons on on the front of the controller: up to manually raise the output value, and down to manually lower it.  Typically, the output value is displayed for the operator as a digital number from 0 to 100 percent.  

So what’s available to fill the bill?
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