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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

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

EHELP: Alarm Tank Level Changes with the SPA2

EHELP: Alarm Tank Level Changes with the SPA2
Q: I want to install a 4-20mA pressure transducer that shows the tank level with an alarm to alert if it is outside the controlled level. With the same signal I want to display the level, alert of level loss, and shut down the pumps if the level reaches a critical point.
Published: March 8, 2016

E-HELP: SIX Maintains Passive Resistance Regardless of Power

E-HELP: SIX Maintains Passive Resistance Regardless of Power
Q: Will the SIX Signal Isolator/Converter pass input signals through if the output is disconnected? We will be replacing our DCS, so we need to know if the input side will continue to work while the DCS is disconnected.
Published: August 20, 2015
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