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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

The SPA2 Automates a Sewage Treatment Sludge Pump Application

The SPA2 Automates a Sewage Treatment Sludge Pump Application

A sewage treatment plant needed to automate the start-stop of a large pump/grinder motor. The existing application used a tank level meter to signal the start-stop of the motor. However human intervention was frequently required to manually override the motor stop mechanism to allow it to continue to operate after the tank was emptied to assure the grinder portion was clear of old debris that would cause a possible stall on the next start. See how the SPA2 helped solve this problem.

Published: May 9, 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

Temperature Q&A with JR Madden: Process Temperature Measurements Shift With Outside Air Fluctuations

Temperature Q&A with JR Madden: Process Temperature Measurements Shift With Outside Air Fluctuations

Q. We have several short thermowells in our process, ranging from 2-inches to 6-inches. Our process is very stable, but we have noticed a temperature measurement shift when the outside air temperature rises or falls. We have tried calibration, but it still doesn’t correct the temperature swing we see. What would you suggest we change that will prevent these temperature swings?

Published: April 27, 2016

THE WNM Wireless Network Module Gets a Makeover Inside and Out

THE WNM Wireless Network Module Gets a Makeover Inside and Out

Our WNM Wireless Network Module now has both Serial and Ethernet interfaces conveniently included into one model and has been updated with a new, sleeker housing. The WNM provides accurate and reliable point-to-point and point-to-multipoint wireless connectivity between remote field sites when wires can’t be run for practical or economic reasons. It is a bi-directional, spread spectrum radio modem that delivers the flexibility and cost-saving advantages of wireless data transmission. 

Published: April 14, 2016
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