Posts Tagged WIKA
A process plant’s technician was mystified about how to get a typical gauge pressure transmitter to read in the vacuum range. “All our gauges are 0 to 30 inches mercury, and that’s what we need to transmitter output to be. But the transmitter you sent us just stays around 4mA when we pull a vacuum.”
We walked out to the reactor vessel to look at the installation. The transmitter’s Low side port was open, its high side port was plumbed into a tee along with a conventional bourdon tube pressure gauge reading gauge pressure vacuum.
I could see why he was confused. The mechanical gauge goes from 0 to 30. I asked what range he used to configure the pressure transmitter. His answer, “0 to 30 inches mercury, same as the mechanical gauge.”
So, what was happening?
Ever hear the expression, “They’re the guys who wrote the book”?
When you hear who it is that “wrote the book”, they immediately gain authority over the rest of the “guys in the field”. It means they’ve taken the time to pull the fundamentals and inner workings into a centralized place, and they have the confidence in their works to share it with the world.
When it comes to pressure gauges and temperature measurement instrumentation…