Recently, a wastewater customer in North Carolina contacted us for help configuring their 1066-C-HT-60 which is connected to the DCS/PLC and had 23VDC as measured at the analyzer terminal. This is a quick recap of the troubleshooting steps and the solution:
Challenge: Output is stuck at 4mA in a 0-1000uS/cm process
Troubleshooting:
Steps taken by customer:
Reset the analyzer [did not work]
Checked for fault messages [none found]
Did a simulation on the analyzer [able to simulate, but live output reading was still stuck]
Steps taken by Emerson Support team:
Check the proper units when ranging (uS/cm or mS/cm) [customer verified range was in uS/cm]
Verified the value of conductivity VS live output:
S1: 524.9uS/cm
T1: 67.5F
O1: 4.01mA
O1%: 0.1%
Conclusion: An output range misconfiguration. Typically the computation is:
Solution: Asked customer to REVERSE the output settings to verify ranging issue. After doing so, the output was no longer stuck at 4mA.
*This solution applies to the following Liquid Analyzer models: 1066, 1056, 1057, 5081, and 56