Electrical:

• The spin housing is made from 100% solid natural polypropylene or PTFE (electrically non-conductive). The internal electrical chassis and motor are connected to earth ground by way of the 3-pronged input power plug. No exposed conductive metal passes through the housing, therefore double insulating the operator against a possible electrical hazard. A local circuit breaker will interrupt the power if a current overload is detected and can be reset — but not over-ridden — by the operator.
• The membrane switch panel is 5 VDC logic level isolated below a grounded static drain grid. The housing and panel material is completely resistant to nearly all solvents including, but not limited to, Acetone, Toluene, TCE, MEK, Methanol, IPA as well as KOH, H₂SO₄, HF, and HCl. Note: Bromine and Fluorine can only be run in the PTFE model. 
• Fully encapsulated hardware for near-absolute corrosion resistance 
• The motor speed is monitored and when set speed can not be achieved (a jammed chuck) rotation will be discontinued and a reason-specific error will be displayed. 
• All electrical devices that can be certified, are UL, CSA, and CE marked.
• The motor seal is higher than the door opening making it nearly impossible for liquid to damage the internal components even if the spin processor's drain is blocked.
• An adjustable down-flow drain and exhaust is available to positively evacuate unwanted gases on a continuous basis.
• All systems have an interlocked Nitrogen/CDA purge in order to  continuously insure that no liquid remains in the process chamber after use to harbor bacterial growth or produce unwanted hazardous reactions.

NOTE: The spin processor is not intended to be liquid-tight and will present an electrical hazard if submerged. The processor must not be located near an open sink where it can be inadvertently knocked into a liquid bath.

Operation:

• A door interlock ensures that rotation and automatic chemical dispensing cannot take place with the door open. A wide lip on the inside bottom of the door routes fluids spun off the wafer to the rear (directly into the drain), while an overlapping shield stops leaking across the door opening.
• A vacuum wafer hold-down interlock prevents process initiation. The chuck must remain at 0 RPM for one second before vacuum can be discontinued. This prevents the accidental release of a wafer while spinning as well as chemicals being dispensed into the vacuum system. Note: Some systems do not have vacuum hold-down using various mechanical retention techniques instead.
• If the programmed speed is not reached within a predetermined period of time the program will discontinue and indicate that a fault has occurred. This prevents mechanical intervention by the operator (as in brushing the top of a substrate or restricting it in some way from rotating).

Pressure vessels, valves & fittings:

• We only supply ASME rated or other 3rd party tested (at least 160 PSI) pressure vessels for chemical dispensing. See manufacturers information plate on each vessel for more details. The intended maximum dispense pressure is < 40 PSI.
• All Teflon dispense valves, flair or compression type (gripper-ferrule) fittings and supply tubing supplied are all rated to at least 150 PSI. LTC supplies all these properly labeled components so that nothing can be compromised during installation of the equipment.

General comment:

• We would appreciate any constructive comment both having to do with operation and safety of our equipment. If you find anything inconsistent or unsafe, now or in the future, please bring it to our attention immediately.
• We now have more than 7,000 systems installed worldwide and have yet to have one safety issue in 22 years of operation. We remain eternally vigilant to this very important issue!