Rastus

Thanks BobLfoot, I should have assumed that you assumed this.

Thanks guys, thats given me something to go with. Is the warning about calcification in deg C or deg F? I believe the steam service is well maintained. There is a treatment system in use. I dont have a flow meter in the system, and i was running the pump at 30Hz because any lower produced ground loop faults with the lower voltage and the excessive moisture. I believe slower water flow results in more heat transfer? I think i will check out the heatexchange, are these serviceable? or does calcification mean replacement? Thankyou.

Hello All, I have a question about heating a tank of water. Its not really Allen Bradley specific, but i am using a ControlLogix unit... Anyway, I'll attach a basic drawing of the layout. I need to heat water to 65deg using an existing heat exchange. Once it is hot, then the water is diverted to a machine for cleaning.  At the moment i am using temp sensor 1 to continue the cycle until it reaches temperature.  Meanwhile Temp sensor 2 has three levels (x<80, 80<x<85, x>85) to open the proportional valve to regulate the steam to the heat exchange at three levels. This process takes a long time, so I'm wondering if i could improve the process anywhere? Besides hardware changes.  Thankyou. Edit: Because of the layout of the sensors etc. The water at sensor 2 reaches temperature much quicker. I was using sensor 1 to ensure the entire tank was hot enough. Maybe i just need to do some trials with sensor 2 as the process variable.