Back to overview

Safe temperature monitoring in process technology

During safe process monitoring, the temperature in the tank is continuously controlled and monitored. Here, closed-loop control and the safety equipment are consistently isolated.

The freely programmable PDT contacts of the SIL-certified temperature transducers can be used for signaling and alarm generation as well as safe shutdown.

Temperature control with safe shutdown

Temperature control with safe shutdown

Application examples: temperature monitoring with current output

Temperature monitoring with 4-wire RTD  

Temperature monitoring with current output - example 1

Connection example 1

Input: 4-wire RTD

Output: 4 ... 20 mA current output with simple signal contact (switching output 1) and safe limit value at the safe controller (combination of switching output 2 and 3, N/C contact in series)

Temperature monitoring via thermocouple with internal cold junction compensation  

Temperature monitoring with current output - example 2

Connection example 2

Input: thermocouple with internal cold junction compensation

Output: 4 ... 20 mA current output with simple signal contact (switching output 1, N/O contact) and safe limit value at the safe controller (combination of switching output 2 and 3, N/C contact in parallel)

Temperature monitoring via thermocouple with external or without cold junction compensation or voltage input  

Temperature monitoring with current output - example 3

Connection example 3

Input: thermocouple with external or without cold junction compensation or voltage input

Output: 4 ... 20 mA current output with simple signal contact (switching output 1, N/O contact) and safe limit value (combination of switching output 2 and 3, N/C contact in series) at the safe controller

Safe Ex i temperature monitoring in process technology

Temperature monitoring with 4-wire RTD  

Ex i temperature monitoring - example 1

Connection example 1

Input: 4-wire RTD

Output: 4 ... 20 mA current output with simple signal contact (switching output 1) and safe limit value at the safe controller (combination of switching output 2 and 3, N/C contact in series)

Temperature monitoring via thermocouple with internal cold junction compensation  

Ex i temperature monitoring - example 2

Connection example 2

Input: thermocouple with internal cold junction compensation

Output: 4 ... 20 mA current output with simple signal contact (switching output 1, N/O contact) and safe limit value at the safe controller (combination of switching output 2 and 3, N/C contact in parallel)

Temperature monitoring via thermocouple with external or without cold junction compensation or voltage input  

Ex i temperature monitoring - example 3

Connection example 3

Input: thermocouple with external or without cold junction compensation or voltage input

Output: 4 ... 20 mA current output with simple signal contact (switching output 1, N/O contact) and safe limit value (combination of switching output 2 and 3, N/C contact in series) at the safe controller

PHOENIX CONTACT Middle East FZ LLC

Office 301, Third Floor, Block 10
Dubai International Academic City (DIAC)
P.O. Box 345002
Dubai, United Arab Emirates
+971 4 4370324