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Process Instrumentation Update
Issue 2 - 2008
In this issue
  •  Isolators & signal splitters can cut your costs in half
  •  Six reasons isolators/splitters are a good choice.
  •  4-20mA Isolator/Splitter Application Notes
  •  Single & Multi-Channel Voltage & Current Isolator/Splitter Products Videos

Cut your costs in half with multi-channel isolators and signal splitters.

Acromag offers the industry's best selection of isolators. Dozens of models are available to meet your requirements. Select from single, dual, and quad-channel models with AC, DC, or loop-powered operation. Signal splitters deliver dual outputs from a single source. And whether you need a unit that sinks or sources current, Acromag has the right solution for you.

Acromag features solve many tough problems. Our multi-channel models reduce costs and save space. Models with push-button calibration simplify installation and maintenance tasks. Units with trim pots ship preset for 4-20mA input/output so field calibration is not required. Series 630T models offer isolated 24V DC excitation on inputs to power your two-wire transmitters.

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Six Reasons Isolators/Splitters Are A Good Choice
Flash video, 8 min.

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Multi-channel AC/DC-powered isolators with flexible I/O ranges.
610T and 630T isolators are compact and cost-effective to deliver excellent performance and great value. Signal splitter units generate two identical outputs from a single input. 

Multi-channel Loop-powered units isolate up to four process loops.
650T and 670T isolators are very cost and space efficient. Variety of units accommodate sink or source loop-powered two-wire connections. Power LEDs and a precision 10 ohm sense resisor provide powerful diagnostic tools.

More information which includes data sheets with specifications, feature videos, application notes, pricing and ordering information about these units is available on our  Website.

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Acromag 4-20mA Isolator/Splitter Application Notes
Download your application guide, pdf

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Quick Video Training on Single & Multi-Channel Voltage & Current Isolator/Splitter Products

4-Wire DC Powered, Voltage/Current Isolators/Splitters 
 Acromag models 611/612T video

4-Wire AC/DC Powered, 4-20mA Isolators/Splitters
Acromag model 630T video 

2-Wire Output Loop Powered, 4-20mA Isolators/Splitter
Acromag model 650T video

2-Wire Output Loop Powered, Voltage Isolator/Splitter
Acromag model 654T video 

2-Wire Input Loop Powered, 4-20mA Isolators
Acromag model 670T video

What kind of isolators are used most often?

Six reasons isolators/splitters are a good choice

What kind of isolators are used most often?

Question: I’m experiencing a difference in 4-20mA readings between a local indicator and the DCS control card. The local indicator reads lower and closer to the actual mass flow than the DCS card. Do I have a ground loop? Will adding your 4-20mA signal isolator in front of the DCS Analog Input card solve the problem?

Answer: Possibly. You may be getting a difference in readings due to a ground loop or other reasons on the DCS card such as calibration, channel to channel interaction, wiring, or scaling.  Click here for an easy method to check if an isolator will help.

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Question: We need to add another loop controller to one of our systems. However, this would push us past our 600-ohm loop maximum. We see fairly expensive solutions to remedy this, but wonder if there is an inexpensive way to get around this type of problem.

Answer: There are three classical solutions to solve the loading problem. First, check to see if the second controller supports a voltage input. If so, perhaps you could monitor the voltage drop across a device that already exists on the loop, e.g., the 1-5V DC input on a DCS or PLC analog input card. With this approach you may be able to solve the application without any additional costs or loading on the primary 4-20mA loop. However, you'll want to "parallel sense" the last load in the loop to keep everything referenced to a single grounding location. Otherwise, you may run into grounding issues. And, you'll want to keep your voltage wiring runs down to 50 ft. or less to avoid voltage drops and noise pickup.  more

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