The leading profile datalogger companies sell pallets to run through the oven. They have built in thermocouples and magnets used to sense conveyor speed. Their software has basic SPC software included that collects data for you, and an easy go/no-go display for the machine operator. Run the pallet once a week, day or shift on the same program and you will get measurements to confirm the oven remains stable. This is a very capable method to catch bad heaters, fans, changes in exhaust,,, Roger Mack P.Eng. Manufacturing Specialist Parker Hannifin Canada Electronic Controls Division 1305 Clarence Avenue Winnipeg, MB R3T 1T4 Canada direct 204 453 3339 x373 [log in to unmask] www.parker.com/ecd From: Fabien Guizelin <[log in to unmask]> To: <[log in to unmask]> Date: 03-27-2012 03:28 AM Subject: [TN] PWI for reflow Sent by: TechNet <[log in to unmask]> Hello, Could you give me guideline on how to set-up PWI limits for SMT ? I experienced a +10oC drift in max-temperature on a transformer between a profile taken a year ago and recently. I am concerned about the potential impact it has on the component (over-temperature). My CM currently operates at 230-260C peak-temp range which seems broad; how does this compares to industry best-practices ? Thanks for the help. Fabien ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ "PLEASE NOTE: The preceding information may be confidential or privileged. It only should be used or disseminated for the purpose of conducting business with Parker. If you are not an intended recipient, please notify the sender by replying to this message and then delete the information from your system. Thank you for your cooperation." ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________