Archive for category Precision Digital

NEW! Quick Start Guide for Precision Digital PD6000 Process Indicator

Written by: Dan Weise

In the past decade or so, there’s been a trend towards putting a Quick Start Guide in the product box, probably in response to some bureaucratic requirement for a piece of paper in an era when manuals, references and user guides are generally pdfs on-line or on CD.

I’m the guy who reads that documentation, so I’ve seen the good, the bad and the ugly.   Most Quick Starts are so scant, they offer very limited value.  But, I’ve just read one that rates fabulous in a world of paper documents that rarely warrant anything but a yawn.

PD6000.jpgWhat a delightful surprise to open up a Precision Digital PD 6000 process indicator box and find their new Quick Start Guide.  A quick flip through the 12 pages revealed it was exactly what I believe a Quick Start should be (and what most aren’t).

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How do I get an RTD signal to two different devices?

RTDs are great temperature sensors – accurate and easy to install.  But they are not friendly when it comes to trying to get a single RTD to go to two places, like when an RTD temperature measurement has to go to both a controller and a recorder.  People call and ask, “How do I split an RTD signal?”  The short answer is, “You can’t.”

An RTD cannot be wired in parallel or in series to a second device.  Any RTD input supplies a known, regulated ‘excitation’ current to the RTD.  Mixing RTD inputs would mix currents and that’s a Big No-No.

There’s also a lead wire compensation circuit for 3- or 4-wire RTDs that would create problems if a single RTD were connected to two different RTD inputs.  There’s just no feasible means of making two RTD analog inputs play nice together.

But all is not lost. There are several ways to achieve your goal.

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