Analog Input Wiring Question 2

kbradray

Member
Join Date
Jan 2006
Location
Columbia
Posts
175
I am wiring an Omega CDE-1202 conductivity probe with a CDTX-1203 transmitter into a ML1100 via the 1762-IF4 analog input module.



I have the transmitter working correctly, but I am unsure about the analog outputs of the transmitter to the inputs of the ML1100



The transmitter has a terminal block with 4 spaces 20VDC COM COM 4-20mA


I wired the system like the 1762-IF4 manual says to do for 4 wire transmitters, but my signal in the processor is not changing. Here is what I have 20 VDC and COM from a power supply and COM and 4-20mA to the –IN0 and +IN0. Note: Both COMs are the same potential.



In the processor I have the IF4 analog input cards in Module 3 and 4 space and configured for 4-20mA and Raw/Proportional Data Format. I am using a SCP instruction to try and scale with parameters. The SCP information is Input I:3/0 Input Min. 6241 and Input Max. 31206 Scaled Min. 0 and Scaled Max. 1000 output N10:0



When I put the probe in tap water the transmitter shows a reading of 423 uS/CM and the SCP shows an output of -371. When I remove the probe from tap water the transmitter reads 30 uS/CM, but the SCP output does not change.



Any help appreciated.



Ken
 

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