Measure contactless dc current 0-100mA

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Is there any sensor available to measure dc current from 0-100mA contactless?

Contactless is the problem, looked for some sensor half effect but they are for very high currents only

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Need more information. What are the physical constraints? What resolution? What accuracy? Cost constraints?

What research have you done so far?

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Why do you need a Hall?  Maybe use an analog isolator

 

try this

 

  https://gmw.com/wp-content/uploads/2019/02/SENIS-CS_03_Spec_r6.pdf

 

They use a coil around the sensor (loop the current round & round) to increase the sensitivity  (you can do the same with a standard sensor).

 

https://www.allegromicro.com/~/m...

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Does "contactless" imply  that you need to be able to measure without disconnecting the wire to put it through a core (and then reconnect)?

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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1. should be contactless, cannot disconnect wire or break it. 

2. Accuracy is +-1mA or even 2mA can also work.

3.  https://www.crmagnetics.com/Assets/ProductPDFs/CR5200%20Series.pdf   have some solution for upto 2Amps.

Looking for some cheaper solution though,

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What price do you consider cheap?
Is the current ac or dc? What frequency?
What output? Analog or digital?

Give us a decent specification please - we shouldn’t need to ask a zillion questions.

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Last Edited: Tue. Feb 4, 2020 - 10:06 AM
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There’s these:
https://www.nve.com/Downloads/analog_catalog.pdf

These babies are spintronic!

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Looks like this solves the purpose : https://www.lem.com/en/ctsr-03p
1. its contactless
2. can measure -300mA to +300mA with 1.9% accuracy.

can connect 16 bit adc and oversample it for better measurement.

do anyone else ever used their product, its reliablity? 

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LEM stuff is usually very good - they're at the more premium end of the market. As for using a 16bit adc - look at the noise specs. You're probably not going to get better than 10 bits worth out of this sensor.