# Current Transducer 0-20mA

#### sandeep reddy_1496663996

Joined Jun 5, 2017
3
I want to feed my current to a PLC., I have multiple outgoings for which i should be taking transducers for each ( Current transformer + current transducer) i have like 20ckts for which i want to monitor the current., i want to reduce the cost of the system., is there any other way where i can use other circuits for this applications.
Links with products are highly appreciated.

Joined Jan 15, 2015
6,974
I am not sure I understand exactly what you have and what you want? Does your PLC allow for a 0 - 20 mA input or 4 - 20 mA input? You have outputs from transducers for example converting pressure, temperature, flow or other forces to a 0 - 20 current loop? Would that be what you have? My systems just used a voltage input so I used resistors in my current loops for example with a 250 ohm resistor 4 - 20 mA = 1 to 5 Volts or using a 500 ohm resistor 4 - 20 mA = 2 to 10 Volts. If you better explain exactly what you have and what you want I am sure there will be solutions.

Ron

#### EM Fields

Joined Jun 8, 2016
583
I want to feed my current to a PLC., I have multiple outgoings for which i should be taking transducers for each ( Current transformer + current transducer) i have like 20ckts for which i want to monitor the current., i want to reduce the cost of the system., is there any other way where i can use other circuits for this applications.
Links with products are highly appreciated.

1. AC or DC currents?
2. Current transformer / transducer data sheets.
3. System schematic / block diagram.
4. What are the "outgoings" coming from?
5. What does your PLC want to see?

#### sandeep reddy_1496663996

Joined Jun 5, 2017
3
I am not sure I understand exactly what you have and what you want? Does your PLC allow for a 0 - 20 mA input or 4 - 20 mA input? You have outputs from transducers for example converting pressure, temperature, flow or other forces to a 0 - 20 current loop? Would that be what you have? My systems just used a voltage input so I used resistors in my current loops for example with a 250 ohm resistor 4 - 20 mA = 1 to 5 Volts or using a 500 ohm resistor 4 - 20 mA = 2 to 10 Volts. If you better explain exactly what you have and what you want I am sure there will be solutions.

Ron
I have a 3phase 4-wire system with Voltage - 415V, Current - 200A.,
Now i want to feed these inputs to a controller which allows 0-20mA inputs.

#### BR-549

Joined Sep 22, 2013
4,928
Maybe it's the language.......but it makes no sense. What are you trying to do?

#### drc_567

Joined Dec 29, 2008
1,156

#### Alec_t

Joined Sep 17, 2013
13,153
i want to monitor the current
Do you simply want to detect whether or not current is flowing, or do you want to measure the currents accurately (and if so, how accurately)?

#### profbuxton

Joined Feb 21, 2014
419
So you have a 4 wire 3 phase 200A system and you want to measure the currents(in each phase , I presume). Just get suitable current transformers that can provide a 4-20mA output. I' m sure its not all that difficult. Its done all the time in SCADA systems.

Joined Jan 15, 2015
6,974
Ohio Semitronic as mentioned and CR Magnetics is another. Since you mention 4 - 20 mA I assume you want to accurately measure the current. You also have a choice of average responding RMS indication or RMS responding and RMS indicating. When measuring relatively clean sine waves the less costly average responding is a good choice. If you want less cost then I suggest basic Current Transformers and you build or buy a transducer to work with your current transformer. A CT (Current Transformer) is inexpensive but will require signal conditioning on your part. A simple Google of Current Transformers should bring up a few dozen results and manufacturers.

Ron

Joined Jan 15, 2015
6,974