After a while, performing that weekly spore test on your autoclave becomes just another task you check off of your weekly Things-To-Do list. Until, that is, you get that notice that says you failed. Then, it becomes a top priority to find out what's wrong, why you failed the test. If you're ruled out operator error, then it's probably an equipment problem. Here are 7 problems you can look for if your Tuttnauer autoclaves fails the spore test.
Not level: It's one of those things that's easy to over look but if someone jarred your autoclave or it was recently moved to a new location it could be that it's no level. The machine needs to be perfectly level in order to force steam downward at the proper angle.
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Broken or dirty gasket: Check the gasket surrounding the door to the chamber. It may be dirty or have some mineral deposits on it that are preventing it from creating an air-tight seal. If that's the case, refer to the manufacturer's cleaning instructions. It may also be cracked or damaged in some way and it's very easy to replace.
Clogged or broken air jet valve: This valve allows steam to be released from the chamber. The pressure inside the chamber circulates the steam and forces it out through the air jet valve. This ensures that the steam inside the chamber remains at a constant temperature and pressure. If this valve is clogged or broken then that cooler steam remains inside the chamber and causes cool air pockets. To clear the jet valve, simply pump the clean out wire back and forth 10 times.
Mineral deposits: Mineral deposits on the inside of the chamber can prevent or inhibit steam circulation which can cause cold spots inside the chamber. Clean the inside of the chamber regularly following the manufacturer's directions. Never use an abrasive cleaner on the inside of the chamber.
Faulty heating element: Just because it looks like the heating element is working doesn't mean it's working properly. There may be a short somewhere that's preventing it from heating to the proper temperature. To check, you'll need to use a volt/ohm meter to measure the resistance. To find the proper range, consult your owner's manual.
Faulty timer: First, be sure you're allowing proper warm-up time. When starting with a cold autoclave you'll need an additional 10 minutes for the cycle. Obviously, the best way to test your timer is with a stop watch.
Faulty temperature sensor: The temperature sensor, or thermistor, controls the heating elements and tells them when to turn on and off. If the sensor is defective then your machine won't reach the proper temperature. If you've tested the element and it's within the proper range, then the problem is with the thermistor. Again, it's very easy to replace this part yourself.
In most states, even one failed spore test is cause for alarm. You'll immediately have to submit another test sample and wait another week for the results. By that time, you could be in big trouble. As soon as you see that first failed test you need to determine what's causing the problem.
And don't panic if you fail a spore test. Most of the time, it's very easy to find and repair any problem you might have with your Tuttnauer autoclave, without having to send it out for expensive repairs.
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Nov 30, 2011 15:23:29
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