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Stabilant 22 Contact Enhancer Application Notes

App. Note 19 - Complex Process Control

What precautions have to be taken in using Stabilant 22 on complex systems?

Whenever a complex process control system is treated using Stabilant 22,Stabilant 22A, or Stabilant 22E, to prevent system malfunction or crashes, the user must be aware that erratic operation of the system may be the result of a bad connection anywhere in the system. While many custom programs have a built-in tolerance of a peripheral error, and deliver a warning of a peripheral malfunction; others, when faced with "input-output device error" may cause the whole system to "hang" or otherwise misbehave.

For this reason we recommend that all connections in a system be cleaned and treated. Where protocol converters, MUX'S, or other complex peripherals are involved, it is important to remember that any one of these might be causing the problem. Generally, we have found that the equipment operating in the most contaminated area, or under the most environmentally severe conditions, will be the first to cause problems. This can apply to a lesser degree even when the equipment is in hermetically sealed cases, if it has been in use for some period of time.

Can RF cause problems?

The possibility of system malfunction due to electromagnetic pulse or even Radio Frequency interference should also be considered. Frequently thin film contamination is encountered in connectors, not only on the pins themselves, but on the outer shielding shells. Thin films of contaminants could result in RF voltages being developed between surfaces that should be connected together. Where corrosion is present it is not unusual for many of the metal corrosion products to act as semiconductors; these can rectify RF signals, or even cause electromagnetic pulses to modulate the signal lines.

What about grounding of equipment?

Complex systems are especially prone to problems caused by poor signal or power supply grounds. It is important to be sure that the grounding of the equipment is functioning properly. Cases where equipment has been grounded to water pipes and where the pipes have later been removed from service and are themselves no longer grounded are not unusual. Even dedicated grounds made to copper-plated rods in the ground should be inspected for loose clamps, or corroded wires. Stabilant 22 can improve the reliability and lower the resistance of these connections.

It is also important to check to see if some other piece of equipment has been installed which might be sharing a supposedly dedicated ground. Electricians do not always appreciate that a ground system from a computer or controller may be dedicated (isolated from other grounds) for a reason.

Can new equipment cause problems?

Sometimes process-control equipment malfunctions only after some other piece of equipment has been installed in the plant. Often this malfunction can be eliminated by using a "Power-Conditioning" device in the electrical supply line feeding the controlling computer alone. Problems can also be caused by peripheral equipment operating off a different power source than the controller/computer when signal isolating interfaces are not used. The problems are caused by the creation of ground loop conditions that can affect the integrity of the data or control signals. It has to be recognized that all power-supply outlets are not low impedance. The transients from one piece of equipment can often affect another's operation. For example, if a dot-matrix printer is installed on the same UPS (Uninterruptable Power Supply) as the computer/controller, some problems might be encountered due to the current pulses from the printer's hammer-wire solenoids getting into the computer, especially if the UPS is being pushed to the limit of its current specifications!

Are there any potential connector incompatibilities?

Occasionally, on conventional (untreated) connectors you may encounter connector pairs where one connector's pins are gold-plated, while the matching socket is solder alloy-plated (or the reverse). Unless the connector design is such as to maintain a high contact pressure there is a galvanic-action corrosion and potential problem here caused by the mismatched materials. Under certain conditions of heat and humidity a poorly-conductive black deposit will be formed within the contact pair. This problem cannot be totally cured by the use of the Stabilant 22/22A/22E although the reliability of the contact can usually be increased. One of the connectors should be changed over to match the plating material on the other. The Stabilants will function on either the gold-to-gold, or the solder-alloy-to-solder-alloy contacts.

What's the bottom line?

Simply that Stabilant 22, Stabilant 22A and Stabilant 22E, are not cure-alls. While in most applications they can substantially reduce the erratic operation of a system, to be effective on hard-to-isolate problems in a complex system, they must be used throughout the system as part of the maintenance program.

Revision 3


Stabilants are a product of Dayton Wright research & development and are made in Canada

NSCM/Cage Code - NATO Supply Code 38948

15 mL of S22A has NATO Part # 5999-21-900-6937


The Stabilants are patented in Canada - 1987; US Patent number 4696832. World-wide patents pending. Because the patents cover contacts treated with the material, a Point-of-sale License is granted with each sale of the material.

MATERIAL SAFETY DATA SHEETS ARE AVAILABLE ON REQUEST


Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W. Electrochemicals Ltd.

Copyright 2003 - D.W. Electrochemicals Ltd. This note may be reproduced or copied, provided its content is not altered. The term "contact enhancer", 1983 Wright Electroacoustics.


NOTICE: This Application Note is based on customer-supplied information, and D.W. Electrochemicals is publishing it for information purposes only. In the event of a conflict between the instructions supplied by the manufacturer of the equipment on which the Stabilant material was used, and the service procedure employed by our customer, we recommend that the manufacturer be contacted to make sure that warranties will not be voided by the procedures.

While to our knowledge the information is accurate, prospective users of the material should determine the suitability of the Stabilant materials for their application by running their own tests. Neither D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or any consequent damages, howsoever caused, based on the use of this information.

Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W Electrochemicals Ltd.

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Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.
Stabilant 22
APPLICATION NOTES
1. Electronic Equipment
2. Computer cards
3. Schadow switches
4. Mic connectors
5. RTS & Dual plug patch bays
6. Biomedical Electronics
7. Computing & Peripherals
8. Cable TV
9. Robotics
10. Environmental Impact
11. Recording studios
12. Broadcast equipment
13. Mobile Radio
14. Educational computing
15. Stereo systems
16. Aid to IC insertion
17. Navigational equipment
18. Card edge conn. problems
19. Complex process control
20. Automotive service
21. Gold plating/solder alloy
22. Very high humidity
23. High current thermal runaway
24. Car stereo systems
25. Plastic element pots.
26. Farm machinery & trucks
27. Model & hobby
28. RF case seals
29. Outdoor environments
30. Computer crashes
31. Relays & switches
32. Silicone problems
33. Tin-plated contacts
34. Solder flux & resin residue
35. Post application color tinting
36. Aircraft connectors w/ flurosilicones
37. Avoiding unsafe solvents
38. S22 R&D Design Goals
39. Stabilant use on PLCC's
40. Sensor problem solution
41. Repair of flood damage
42. Marine electrical & electronics
43. All Cameras & Video Equipment
44. SCSI removable SCA drives, caddies & connections
45. Home Theater & Computer Connectors

Some of these application notes are repetitive of material in other application notes. We realize this. But some were written as a reference to a contact problem in a particular field or application.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
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Stabilant 22
REVIEWS
Over the years, Stabilant 22 has been highly parsed in publications that target a wide range of electronics applications including:
* Andrew Marshall's Audio Ideas Guide
* BYTE Magazine (7 articles)
* Windows Magazine
* Q.S.T. Amateur Radio
* Model Railroads (2 articles)
* Motor Magazine
Stabilant 22
TECHNICAL NOTES
1. MSDS - Stabilant 22
2. General Information
4. MSDS - Stabilant 22A
5. MSDS - Stabilant 22E
9. MSDS - Stabilant 22L
20. Military Applications
21. Elastomer Compatibility
22. Effectiveness of Stabilants
24. Connector Harmonic Distortion
39. Signal rise time

There are gaps in the sequence numbers below because some Technical Note s were written by the manufacturer for specific companies and are confidential.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.

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