Which is better: using the NI 9203 or USB Volt to differential entrance map

Dear all,

I have 4 pressure transmitters, temperature transmitters 4 with output 0-10 v or 4-20 my. I have also 2 with output 4-20 flow meters my.

I have two options:

Is to get all the signals in my and link them to the C two modules NI 9203 or I can get 8 sensors with 0-10 V and then I can use for example NI 6218 where I can connect these signals using differential configuration. While the last two signals (of the two flowmeters) should be converted using components SSC to sell volts so that I can connect them to the same card.

Which solution is better in regards to signal noise?

Someone told me that NI 9203 does not support differential configuration, such as the signal of my does not noise like the Volt signal so it does no differential configuration.

Also, NI 9203 has 0-20 my input range and the output of the sensors is 4-20 my... Is there a problem?

Please advise...

Yours,

Ehab

Hi Elijah,

Do you mean that you have the choice between voltage and current transducers and want to know what is the best?

Current loop 4-20 mA is intrinsically less sensitive to voltage noise.  4-20 my sources have an output impedance much higher that a shunt resistance, so that the vast majority of the noise is deleted in all of the source.  The following application note of the BAPI and our own Developer Zone article both give a good overview of the subject:

Understand the current loops 4-20 my

Current measurements: practical Guide

Regarding the 0-20 mA or 4-20 mA, you will have no problem here.  4-20 mA is commonly used for sensors one reasons are that a 0 can be used to indicate a bad connection (open).

When you take a measure of the tension, the best way to reduce noise is to measure differently, with your connections made with threads of the shielded twisted pair (Wikipedia link).  The idea here is that any atmospheric noise would affect both the + and - ends of your signal.  Since you measure differently, the noise cancel out.

You will be probably very well in both cases.  If you use the 6218, you can provide your own external shunt resistors to measure the current, while using other channels to measure the voltage. See the article How to build a system of loop current with isolated M series.  It seems to not be updated for the 6218, but this Council provides isolation recommended for current measurement.

The 9203 s have this integrated to the Board of Directors and are designed specifically to the measurement current.

Other recommended reading would be field of wiring and considerations of noise for analog signals.  When setting up this system, you will need to make sure that everything is grounded correctly (without ground-loops, floating connections, etc.).

-John

Tags: NI Hardware

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