Hi, I am currently working on a pizza warming tray that uses a resistive heating element, a thermostat and a thermal cut-off. They are getting a large number of returns due to the thermal cut-off opening. There is no hazard, the thermal cut-off is doing its job.
The questions I have are on the thermostat. 1. The manufacture states a 2% failure rate is normal. This seems high to me. Can anyone verify this or recommend a "better" manufacture. The load is 120 V, 220 Watts. Temperature range 90 to 100 deg. C. 2. What is the failure mode for thermostats? Is it likely for a thermostat to get "stuck" in the closed position and then start working? Maybe after being subjected to a mechnical shock? The ones I have checked seem to be working. e.g. are in the normally closed position and when heated open and then close when cooled. Ned Devine [email protected] Phone 616 248 9671 Fax 616 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
