Instrumentation engineering root cause analysis (RCA) of thermocouple extension cable lead problems and solutions.
Article Type: | Root Cause Analysis (RCA) |
Category: | Instrumentation |
Equipment Type: | Sensors |
Author: | S. Raghava Chari |
Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of two or three decades ago. These articles will help you to improve your troubleshooting skills and knowledge.
Study the previously discussed Problem: The thermocouple (TC) flange fire had burnt the 50-m long 30-pair chromel-alumel extension cable connecting the Mineral Insulated Thermocouples (MITC) JB to the control room instruments.
Airfreight from the US takes a minimum of one month. Vendors quoted min 6 months delivery and no plants could loan or sell.
The author developed the below-given steps to solve the difficult unresolvable despairing problem (DDUDP).
How does the above-described modification work?
Fig shown circuit explanation
# | Particulars | Data |
1 | Convertor TC emf output | TM-TJB1 |
2 | Shorted Single pair Ext Lead emf output | TJB1 – TI I-Panel Inst |
3 | Fig: connections add 1+2 | |
4 | Hence EMF at instrument terminals | (TM-TJB1)+(TJB1-TI) = (TM-TI) |
5 | The instrument’s cold junction compensation adds emf = TI. Hence the instrument reads the measured temperature TM Correctly |
Benefits Realized are A total plant shutdown (SD) causing DDUDP resolved inexpensively.
Instrument crew and supervisors learned that one can solve most problems by applying job knowledge and innovations; hence, all should relentlessly increase job knowledge by studying vendor literature, tech journal articles and ads, and remembering these for timely use.
Author: S. Raghava Chari
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