If you connect the 2 wires from the AM2 AQ to the same 2 pins at the DCS, where before the sensor was connected, then this is faulty. Search for a M or GND pin at the DCS or show us a connection diagram. Your red wire of the sensor was connected to which pin at the DCS ? This pin you don't have to use with the AM2 AQ.

Regards, Scorp

ixo65

The current output of the AM2 is like a 4-wire sensor, since the AM2 AQ requires a 24 VDC power supply, so it is active.

You confused me with your drawing because on the AM2 you drew AQ as output terminals U1 and not I1.

So:

I1 to the (+) input terminal of the DCS system, M1 to the (-) input terminal of the DCS system.

 yes sorry about that you are correct. 

Now about this : The current output of the AM2 is like a 4-wire sensor.

if the DCS pushing power through the loop, (it must be as the sensor lights up when connected directly to the DCS on TWO wires)  what will it do if i connect the AM2 AQ to the DCS ? 

It seems to be, you are not interested on my entry, then do it your way.

2-wire sensor inputs are often designed that one connection goes internally to + 24V and the second connection goes internally to ground via a shunt resistor for the 4-20mA signal. That means, one connection is +24V and the second connection is the input for the 4-20mA output of any sensor or the Ix output of a AM2 AQ. Then you have to connect the M of AM2 AQ with the internally ground of the DCS. (M, 0V, GND ...)

If you want to be sure, then you need a connection diagram of your hardware.

Good luck

Scorp

It seems to be, you are not interested on my entry, then do it your way.

2-wire sensor inputs are often designed that one connection goes internally to + 24V and the second connection goes internally to ground via a shunt resistor for the 4-20mA signal. That means, one connection is +24V and the second connection is the input for the 4-20mA output of any sensor or the Ix output of a AM2 AQ. Then you have to connect the M of AM2 AQ with the internally ground of the DCS. (M, 0V, GND ...)

If you want to be sure, then you need a connection diagram of your hardware.

Good luck

 Hello again,  i have found a solution, and wanted to share with you guys.

it's a 4-20 MA signal isolator.. plug in.. plug out.. 

PHOENIX CONTACT | Repeater power supply - MINI MCR-SL-RPS-I-I - 2864422

it'S the simplest way without having modify the wiring as this is a test we are doing to install a  sensor cleaner on the process.

Now I'm out of the subject, you don't seem to have understood anything or don't want to understand. 

Without clarification of your signals at DCS the problem cannot be solved, also not with the Phoenix repeater.

Bye, Scorp

P.S. See attachment for an example, how a 2-wire-sensor input could be designed. There pin 1 is only usable for passive sensors, pin 3 only for active sensors, pin 2 is the measure input.