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EHELP: Temperature Measurements in Liquid

EHELP: Temperature Measurements in Liquid

Q: We want three 100 ohm, .00385 Alpha RTDs to measure heated glucose in railroad cars. We heat the glucose to 140-150°F, and want to use a 5-foot long flexible sensor with a head on top containing a terminal strip. We also want to run flexible conduit from the head with copper wire for easy replacement access. We can fabricate a bracket that would span the midway above the railcar that supports the housings and includes holes that allow the flexible RTDs to drop down for installation. What do you offer that is a fit for our application?

Published: June 28, 2016

EHELP: How do I protect the STA from external voltage surges?

EHELP: How do I protect the STA from external voltage surges?

Q: We want to install an
STA / HLPRG / 3PRG / U / -AO [DIN] into our process and plan to use 4-20mA output loop voltage sourced by a DCS for the analog output, however this voltage may fault at up to 132 VAC. Should we design in fuse protection to the external voltage circuit upstream of the STA to protect it from these surges? Or does the STA include features that protect it from these faults?

Published: June 14, 2016

EHELP: We need a relay that can withstand high DC current at high voltages

EHELP: We need a relay that can withstand high DC current at high voltages

Q: My Model 330R process monitor with display has configurable threshold output relays that I need to set in order to activate a 125Vdc battery powered circuit which is part of a failsafe control room application. How would I set these up when standard instrument relays are rated at 125/240Vac and 24Vac/dc?

Published: May 23, 2016

EHELP: Can we run a pneumatic chart recorder with an IPT2 or IPX2 Current-to-Pressure Transmitter?

EHELP: Can we run a pneumatic chart recorder with an IPT2 or IPX2 Current-to-Pressure Transmitter?

Q: We need to combine a new system for reading tank levels with an existing system by replacing a Hagan instrument with a new Rosemount device. However, we need to ensure we can still run an existing 3-27psi pneumatic chart recorder. We’re considering using an I/P, but aren’t sure if the 4-20mA output from the new transmitter can be piggybacked. Is this possible?

Published: May 3, 2016

E-HELP: Can multiple 4-20mA signals be placed on one 4-20mA signal as HART dynamic variables?

E-HELP: Can multiple 4-20mA signals be placed on one 4-20mA signal as HART dynamic variables?
Q: You have a product called HART Interface Module (HIM) that will pull the 2nd, 3rd and 4th HART variables from a transmitter signal and create one 4-20mA signal for each. Do you have or know of an instrument that will take multiple 4-20mA signals and output them on one 4-20mA signal as HART dynamic variables?
Published: April 19, 2016
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