Q: I am interested in an ECA alarm unit, model #: ECA/4-20MA/DH1H1/24DC/DIN. I have three questions:
1. I have a need for three different trip setpoints based on the same transmitter input. How can I accomplish this with the ECAs? Can I use two ECAs using the second ECA with a 1-5VDC input or can the 4-20mA signal be run in series through both ECA inputs?
2. Do I need to specify the -RF option to get the RFI protection? And is the testing for both radiated and conducted susceptibility (RS103, CS114, CS115)? Is it possible to see the test report for the EMI/RFI testing?
3. Is DIN-rail the only mounting option?
A: To answer your three questions:
1. Your 4-20mA signal can be connected in series to the inputs of more than one ECA, each of which with a 50 ohm load on the loop. Alternatively, you can use a SPA2 Limit Alarm Trip (Model #: SPA2/HLPRG/4PRG/U [DIN]) which has four setpoint relay outputs.
2. The ECA-DIN has RFI/EMI Protection to 10V/m, 20-1000MHz for which the trip point would not be affected by more than 0.1% of span. It conforms to the following EMC specifications:
EN50081-2, 1993, Generic Emissions Standard, Industrial Environment.
EN50082-2, 1995, Generic Immunity Standard, Industrial Environment.
EN61010-1, 1995, Safety requirements for electrical equipment for measurement and control use.
3. Both the ECA-DIN and the SPA2 are designed for DIN rail mounting; however, we also offer them with options for flange mounting.
Do you want more information? Download the data sheet. Or visit the catalog.
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