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EHELP: Application for an Analog Splitter

EHELP: Application for an Analog Splitter

Q. I have an application that requires an analog splitter. The single input signal to the splitter comes from a transducer, and the transducer requires loop power. The two outputs are going to an active analog monitoring card on a PLC, which provides power to the connected 4-20mA signals. Is the ECT what I need?

Published: February 9, 2017

EHELP: What are the advantages and limitations of HART protocol or an instrument with embedded MODBUS communication?

EHELP: What are the advantages and limitations of HART protocol or an instrument with embedded MODBUS communication?

Q: What are the advantages and limitations of HART protocol or an instrument with embedded MODBUS communication? How many instruments can the HCS interface in the same loop? Are we able to read/write the five instruments at the same time using HART?

Published: January 24, 2017

EHELP: STA Latching Checkbox

EHELP: STA Latching Checkbox

Q: We do not have sufficient PLC digital output spares to perform a Manual Reset of the three installed safety temperature controllers. We are going to remove the alarm latching on both limits and faults on our STA Functional Safety Alarm Trip. The Manual Reset radio button stays active in the STA configuration software. Will the latches clear after we are outside the dead band limits? 

Published: January 10, 2017

EHELP: SPA2 Tank Application

EHELP: SPA2 Tank Application

Q:  Do you have a signal alarm unit for a tank level application? I need it to meet the following requirements:

  • Input signal accepts 4-20mA.
  • Contacts opened or relay de-energized @ EL 208 ft.
  • Equipped with up to four alarm trip relays.  
  • Individually configured for: set point, high or low trip, normally open or normally close, failsafe or non-failsafe, and latching or non-latching.
  • ■ Deadbands adjustable over 100% of span.
  • ■ Output relay equipped with form C contacts rated at 10A, 120VAC.
  • ■ All operating parameters adjustable from the front panel keypad.
  • ■ Operate on a 120V 60 Hz power source
  • ■ Capable of supplying 24V dc power to two-wire transmitters.
Published: August 23, 2016

EHELP: HIX Minimum Output Value

EHELP: HIX Minimum Output Value

Q:  HIX Application - It appears that if the "Primary Master" loop (input loop side of the HIX) is broken or open circuited, the "Secondary" loop (output loop side of the HIX) will be 0mA.   Is this true?  Maybe I can put a zener across the primary process terminals to keep the current loop when the process opens? Also, are both or either loops bi-directional HART? I have a 4-20mA input signal that I'd like to share between two 4-20mA/HART process loops. Actually, we currently use another vendor's device to "split" one 4-20mA input to four process loops but it doesn't pass HART.

Published: August 9, 2016
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