Change variable voltage to variable amperage

[MattO]

I am using FP-1000 with the AI-111 module. I have a conductivity meter that outputs 1mV per digit at 8 amps. I have been told that I can switch the variable voltage into a variable amperage signal so the AI-111 can read it. Any suggestions are much appreciated.

[rgharrison]

Hi Matt,

Are you referring to your conductivity meter being able to vary the current instead of the voltage? What type of conductivity meter do you have?

Ron

[MattO]

I am using a Cole Parmer 19300-10 conductivity meter. Yes, I need to switch from variable voltage to variable current. Also, I need to step the voltage down from 8 Amps to 4-20 milli-Amps. Thank you for your consideration.

This is the specs for the conductivity meter.
http://www.coleparmer.com/catalog/product_view.asp?pfx=&sku=1930010&cat=1&sel=1930010

This is the field point module I am using.
http://sine.ni.com/apps/we/nioc.vp?lang=US&cid=2186

[rgharrison]

Humm, I would try using a multimeter and playing with the controls on the conductivity meter (as long as the multimeter can tolerate the values). Otherwise, I would simply contact the manufacturer as they would have someone who could easily describe how to use the meter.

Anyway, sorry I couldn't be of more help.

Ron