Thermocouple extension wires are not only expensive but are a primary culprit of measurement error over time. Corrosion and susceptibility to plant noise are common sources of measurement error due to long TC extension wire runs.
Hydrocrackers used a lot of thermocouples. You can reduce lead wire expenses and thermocouple measurement errors by taking a different approach of installing DIN rail temperature transmitters in the field, close to the process, and running shielded twisted pair back to the DCS. The Class I Div 2/Zone 2 approved THZ3 Smart HART Dual Input Temperature Transmitter is a highly accurate and repeatable DIN rail temperature transmitter with advanced diagnostics.
If your control system’s input cards can read HART, you can further reduce your measurement cost per point by bringing two sensors to each THZ3 and reading the PV and SV dynamic HART variables, which represent Sensor 1 and Sensor 2 respectively.
Key Attributes:
- Class I Div 2/Zone 2 approved DIN version of THZ3
- Dual input capability may reduce cost per point
- High ambient operating temperature range of -40 to 85C (-40 to 185F)
