299 a:4:{s:8:"template";a:1:{s:26:"Work Instruction-full.html";b:1;}s:9:"timestamp";i:1332523140;s:7:"expires";i:1332526740;s:13:"cache_serials";a:1:{s:102:"pnTemp/pnRender_compiled/pagesetter^ExtraLite762^eng^%%77^779^77971C52%%Work+Instruction-full.html.inc";s:32:"fa704d86cc197ed6650099e120e77036";}}WI 3006 - Calibrating the Oven


Created Modified Rev. Changed by Change
08/09/05 07/25/07 4 Mike Maynard Added setting & overlimit verification, as well as calibration 'operator'



Oven Number: _________________               Date:_________________       Calibrated By: ________________________________                

1 Place thermocouples into the oven. One thermocouple should be center of the shelf, 1/3 from the bottom of the rack. The second probe should be placed on a shelf 1/3 from the top of rack, at the center of the shelf. Attach the HH306 data logger to the probes. Close the oven doors being careful to not pinch any of the wires. Press record on the data logger.
2  Manually set the oven for a low temperature: 175°F. Let stabalize for ~ 1 hour
3 Manually set the oven for high temperature: 690°F. Let Stabalize for ~ 1 hour
4 Looking at the data from the logger fill in the following:
Low temp bottom probe:  
Low temp top probe:   
Low temp set point:   
High temp bottom probe:  
High temp top probe:   
High temp set point:  
5 If the difference between low and high temperatures is greater than 5 degrees, oven maintenance will need to be preformed before calibration can proceed.
6 If the average of top and bottom probes differs by more than 5 degrees from the set point, the calibration will need to be adjusted.
7 To adjust calibration the following values will be needed:
Old calibration ‘b’:  
Old calibration ‘m’:  
8 Open the ‘oven cal spreadsheet.xls’ and fill in the orange, yellow, and blue cell with the appropriate values.
9 Record the new ‘b’ and ‘m’ values below, then input the values into the oven computer
New calibration ‘b’:   
New calibration ‘m’:  
10 Let oven stabalize again at 690°F, & verifiy changes
11 Manually set the oven for high temperature: 750°F
12 Monitor & Verify the overlimit switch shuts oven off at 730°F +/- 5°F
13 Turn oven off and reset back to 'standby' status on the computer

 
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