[FONT="]Hi;[/FONT]
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[FONT="]In a panel room of a flexo graphics printing machine, there are 11 panels having servo drives and VFDs. There are industrial air conditioners mounted at all panels. Then all the panels have been covered by an aluminum cabin (panel room). For cross ventilation in panel room, a 5000cfm blower has been installed with corresponding 03nos exhaust fans. A FATEK brand PLC FBs-20MA has been installed with a thermocouple module FBs-6TC. A regular Chinese made round tip rod “K” type thermocouple has also been installed and connected with thermocouple module to measure the EXHAUST AIR Temperature. PLC monitors the exhaust air temperature and regulates the speed of fresh air blower and switches the exhaust fans. As the system is in commissioning phase and almost completed, so I have also installed an Autonics (Korean) brand temperature meter with same “K” type thermocouple connected to verify the same temperature reading both at PLC and Autonics meter. [/FONT]
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[FONT="]My problem is that some time the temperature display of both PLC and Autonics meter is equal and some time there is a difference up to +/-6°C. I am confused why this is happening. Anyone can help me out? [/FONT]
[FONT="]I also need info which kind of thermocouple is suitable at such position to measure correct temperature?[/FONT]
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[FONT="]In a panel room of a flexo graphics printing machine, there are 11 panels having servo drives and VFDs. There are industrial air conditioners mounted at all panels. Then all the panels have been covered by an aluminum cabin (panel room). For cross ventilation in panel room, a 5000cfm blower has been installed with corresponding 03nos exhaust fans. A FATEK brand PLC FBs-20MA has been installed with a thermocouple module FBs-6TC. A regular Chinese made round tip rod “K” type thermocouple has also been installed and connected with thermocouple module to measure the EXHAUST AIR Temperature. PLC monitors the exhaust air temperature and regulates the speed of fresh air blower and switches the exhaust fans. As the system is in commissioning phase and almost completed, so I have also installed an Autonics (Korean) brand temperature meter with same “K” type thermocouple connected to verify the same temperature reading both at PLC and Autonics meter. [/FONT]
[FONT="] [/FONT]
[FONT="]My problem is that some time the temperature display of both PLC and Autonics meter is equal and some time there is a difference up to +/-6°C. I am confused why this is happening. Anyone can help me out? [/FONT]
[FONT="]I also need info which kind of thermocouple is suitable at such position to measure correct temperature?[/FONT]
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