We use a 125 ohm 0.1% (these cost about $7USD). I have used flow meters tha=
t required a minimum of 250 ohms. I have seen 250 ohms used more than any o=
ther value.

Best Regards,

Fred Bailey

Sent from my Verizon Wireless 4G LTE DROID

William Couture <bcouture@gmail.com> wrote:

>On Fri, Jun 28, 2013 at 8:48 AM, Matt Rhys-Roberts <
>matt.rhys-roberts@envinsci.co.uk> wrote:
>
>> In the world of 4-20mA instrumentation, is there any such thing as a
>> typical or ideal input resistor at the receiver end?
>>
>> I notice a few diagrams using a 250R res across the Rx input terminals,
>> which seems a default value. To some extent I guess it can be altered to
>> provide the required voltage from the current range.
>>
>> It seems that I need to specify enough voltage at the Tx end, to
>> overcome both the cable's length and the Rx's Zin. Both these
>> resistances are a little undefined to me at this point.
>>
>> Any personal experiences about this please?
>>
>
>All the 4-20mA instrumentation sensors we design use 49R9 as the sense
>resistor.
>
>Bill
>
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