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Two 4-20 ma Sensor on one Differential channel in CR1000

heman728 May 5, 2023 05:07 AM

Dear,

I Have CR1000 and only one Differential channel is left available. I want to connect 2 temperature sensors having 2 wire 4-20 ma output. I am using a two100 ohm resistor ( ±0.03%,2PPM) for current to voltage conversion. I am using a separate 24V Power supply. Can I measure 0-100 degree celsius at ±0.5°C accuracy on a single-ended channel?

Ground is common for External 24v supply and Campbell Differential Channel 3 ground.


The Diagram is attached in the following link.


https://drive.google.com/file/d/19QS0KlKS7kFP4wf2GYc9ZKj_1COHLMIY/view?usp=sharing

Link for Diagram

JDavis May 11, 2023 04:03 PM

You need two resistors wire them as separate SE voltage measurements.

Solkill May 17, 2023 09:47 AM

 

Dear,

I Have CR1000 and only one Differential channel is left available. I want to connect 2 temperature sensors having 2 wire 4-20 ma output. I am using a two100 ohm resistor ( ±0.03%,2PPM) for current to voltage conversion. I am using a separate 24V Power supply. Can I measure 0-100 degree celsius at ±0.5°C accuracy on a single-ended channel?

Ground is common for External 24v supply and Campbell Differential Channel 3 ground.


The Diagram is attached in the following link.


https://drive.google.com/file/d/19QS0KlKS7kFP4wf2GYc9ZKj_1COHLMIYgeometry dash bloodbath/view?usp=sharing

Link for Diagram

 

I see your diagram. It not too clear. I think that you can measure 0-100 degree celsius at ±0.5°C accuracy on a single-ended channel. Just find more info on the Internet.

* Last updated by: Solkill on 5/17/23 @ 9:48 AM *
annariddle Oct 31, 2023 07:03 AM

Dear,

I Have CR1000 and only one Differential channel is left available. I want to connect 2 temperature sensors having 2 wire 4-20 ma output. I am using a two100 ohm resistor ( ±0.03%,2PPM) for current to voltage conversion. I am using a separate 24V Power supply. Can I measure 0-100 degree celsius at ±0.5°C accuracy on a single-ended channel?

Ground is common for External 24v supply and Campbell Differential Channel 3 ground. 

The Diagram is attached in the following link. 

https://drive.google.com/file/d/19QS0KlKS7kFP4wf2GYc9ZKj_1COHLMIY/view?usp=sharingdinosaur game

Link for Diagram

The differential measurement is effectively reading the voltage at both ends of the resistor and reporting the difference. 

* Last updated by: annariddle on 10/31/23 @ 7:03 AM *
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