They are used as highcurrent switches or contactors, where contact erosion. A mercurywetted contact capsule used in relays or switch assemblies whose contacts are hermetically sealed in a chosen environment and includes a flat, spiral spring armature. We have talked to the company gunther and they have told us to use movs and snubber networks to keep them from sticking and to solder them onto the board at a temperature no higher. The lower contact is a pool of mercury that gets displaced by the plunger assembly, thereby coming in contact with the metal electrode during operation. Mercury wetted contact relay hg2a1004 amateurd clare, c. How reed relays work dry reed relays mercurywetted contact. Us3643185a mercurywetted relay and method of manufacture. Mdi relays are hermetically sealed with high quality glass to metal seals and the stainless steel tube is totally encapsulated in ul approved epoxy. Mercurywetted contact relay hg2a1004 amateurd clare, c.
Nuclear power facilities which are using or whose design includes the use of mercury wetted matrix relays in the rps shall submit either their plans and. Tilt it and the little glob of mercury inside makes an electrical connection. Relays were used extensively in telephone exchanges and early computers to. For model mercurywetted contact relay hg1002, clare, c. Taking inspiration from 1940s mercurywetted electrical contact relays. Dry and mercury wetted switches are available with the same pin. May 22, 2015 except for arkansas nuclear one unit 2 and palisades, both of which use dry contact matrix relays, the nrc understands that all other operating ce plants use c. Mercury can be irritating to contaminated skin and eyes.
Contact protection for mercury wetted switch contacts bell. A mercury relay mercury displacement relay, mercury contactor is a relay that uses mercury as the switching element they are used as highcurrent switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts owing to environmental considerations about the toxicity of mercury, mercury relays are mostly obsolete. The 4511 has been designed with several exceptional features that make it stand out from competitive products. In the known mercury wetted reed switches the mercury is contained in a small tank and. Hallicrafters model ht30, ht32, ht32a, ht32b, ht37, ht44, sr150 and sr160.
Mercury wetted devices are also available for applications where bounce free. Chicago, il, build 1991, 2 pictures, united states of america, schematics, tubes. Clare model hg2x1011 mercury wetted matrix relays in the rps. Replacementcrossovers for mercury relay contactors. If accidental breakage or crushing occurs causing mercury leakage, restrict access to the area and contact your company safety officier and or your local department of environmental conservation. In both types, the reeds thin, flat blades serve multiple functions. This high voltage reed relay is designed with a specially packaged coil with a pcb pin out for the coil only. Reeds are hermetically sealed in glass tubes with trace amounts of liquid mercury to provide continuously refreshed contact surfaces for extremely long life.
A mercury wetted reed contact relay according to claim 1, wherein the reed means are made of a semihard magnetic material. Normally closed mercury relay, with coil around top of tube and adjustable angle. Unusually for high power relays, this range features sputtered ruthenium switches which makes them usable at low levels also. Reconfigurable surfaces for energy transmission contacts.
Contact rating max dcpeakac resistive 3 10 watts life expectancy signal level 1. Important the mercurywetted relay contact rating is 5 amperes maximum, or 500 volts maximum, the product not to exceed 250 voltamperes with contact protection. They are used as highcurrent switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. Nuclear power facilities which are using or whose design includes the use of mercurywetted matrix relays in the rps shall submit either their plans and. Spdt rhodium mercury tungsten, application data how reed relays work the term reed relay covers dry reed relays and mercurywetted contact, contact surfaces of the stationary contacts. Mercury marine outboard service manuals pdf download. A mercurywetted reed contact relay comprising at least two reed means having coacting. The other electrode has a hollow tubular structure filled with mercury. This module provides high voltage carrying capability as well as very low and consistent contact resistance. Mercury wetted matrix relays manufactured by the adams and westlake company were initially used in the palisades plant. Page 1 declaration of conformity page 2 page 3 table of contents page 4 page 5 page 6 page 7 warranty information page 8 outboard limited warranty.
Upon detecting a failed relay, the failed unit shall be replaced with a qualified drycontact relay or a new mercurywetted relay. Mercury relays are known for being durable and handling difficult and dirty environments. Switch ratings dry switches z 1 form a energize to make, 10 watts at 200v. This relay is a transfer arrangement comprising mercury wetted contacts sealed in a hydrogen atmosphere at 250 pounds pressure. Mercuryfilled and mercurywetted relays are exceptions. The item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. One of the electrodes has an associated reed for making and breaking contact with the other of said electrodes. Mercury can be irritating to contaminated skin and eye. We are having problems with our mercury wetted relays that we use on our io board. How reed relays work the item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. It consists of a set of input terminals for a single or.
High sensitivity reed relays pickering electronics. Mercurywetted relays make and break circuits using a thin, self renewing film. Mercurywetted relay a mercurywetted relay is a form of reed relay in which the contacts are wetted with mercury. The h series high voltage reed relay is capable of switching up to 10kvdc and breakdown voltage of 15kvdc. For high speed use, the mercurywetted relay is used instead. Email this page download pdf download pdf printable page. Pickering relay products can be downloaded from the web site. Cylindrical, linear, stopless mercury switch and relay. The construction permits use of an optimum mercury film supply affording long operating life, elimination of contact bounce, chatter and noise, and operation in any position.
The switch contacts are available for direct wiring sky wiring. This combines the speed of a lowmass relay, together with. Midland ross mercury wetted contact relay demo youtube. The 4 series are single throw, normally open, miniature mercury reed relays. Model 4511 32 spdt mercury wetted relays product description the 4511 provides 32 spdt mercury wetted relay channels. The construction permits use of an optimum mercury film supply affording long operating life, elimination of contact bounce, chatter and noise, and operation in any. Following are the features of the mercury wetted reed relays. A glass reed relay has an elongated glass enclosure with an electrode passing through and being sealed to each of the opposite ends of said enclosure. Mercury contactors liquid level control float switches.
Contact protection for mercury wetted switch contacts. Mercury relays, mercury contactor, high voltage relay and. A mercurywetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. Aug 17, 2010 tilt it and the little glob of mercury inside makes an electrical connection. If there is a chance that you might want to use mercury wetted relays instead of dry relays at a later date, for example to increase switch ratings, lay out the pcb initially as though for the mercury wetted type. Got our start in 1975 as a small family owned business. Mercury marine outboard service manuals are available for immediate download.
Page 7 the chart figure 5 affords a convenient means of determining the necessary contact protection. Pickerings series 114 reed relay range is a great choice for users that are looking to switch high powers. Important the mercury wetted relay contact rating is 5 amperes maximum, or 500 volts maximum, the product not to exceed 250 voltamperes with contact protection. It includes the total amount of mercury in all products that were sold in the u. A mercury relay mercury displacement relay, mercury contactor is a relay that uses mercury as the switching element. A mercury wetted contact capsule used in relays or switch assemblies whose contacts are hermetically sealed in a chosen environment and includes a flat, spiral spring armature. The contacts of these relays are wetted with mercury, which is used to reduce the contact resistance and voltage drop. A mercury wetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. Mercury reduces the contact resistance and mitigates the associated voltage drop. The contact resistances of the initial goldtogold contacts are around 0. A mercury wetted reed contact relay comprising at least two reed means having coacting ends contained in a glass capsule. View datasheet instrumentation grade hg dip reed relay mss2 mvs2 from comus international.
Forma yk closed d2 and d11 lit yk open all unlit formc yk closed d2 and d11 lit. A mercury relay is a relay that uses mercury as the switching element. High performance reed type 159160 the mercury wetted contact relay represents one of the more, only major weakness of a mercury wetted contact relay is the necessity to mount the relay within 30, mercury wetted contact relay on the market, the basic contact element has essential concepts in common. Mercury contactors solid state relays liquid level control. Sealed contacts with mercury wetted contacts have longer operating lives and less contact chatter than any other kind of relay. Solid state and mechanical switching technologies are combined to provide the performance advantages of both technologies in the industry standard dp contactor package. They seem to stick open randomly after one use or many uses, doesnt matter. Mercury contactor relays surplus sales of nebraska. If you have a dirty old paper copy of this manual or a pdf copy of this manual on your computer and it crashed we can help. Such relays are used to switch lowvoltage signals one volt or less where the mercury reduces the contact resistance and associated voltage drop, for lowcurrent signals where surface contamination may make for a poor. Safety compendium, chapter 4 safe control technology pdf. An electrode of this type of relay when not in contact presents a smooth rounded surface which for this discussion will be considered a spherical section. Operation, maintenance and installation manual 122 pages. Taking inspiration from 1940s mercurywetted electrical contact relays and current.
Mercury wetted contacts reed relays engineering360. Jan 20, 2017 mercurywetted relay a mercurywetted relay is a form of reed relay in which the contacts are wetted with mercury. Upon detecting a failed relay, the failed unit shall be replaced with a qualified dry contact relay or a new mercury wetted relay. In 1990, mdi added mercury floats to its list of manufactured products. Series 104 switch ratings the contact ratings for each switch type are shown below. The dimensions are such that only a limited amount of mercury.
The products we offer are highly reliable, long lasting, and feature hermetically sealed selfrenewing contacts. A reed contact relay comprising within a capsule, reeds the coacting tips of which are provided. Such relays are used to switch lowvoltage signals one volt or less. Midland ross 160351moo mercury wetted contact relay. Select picture or schematic to display from thumbnails on the right and click for download.
Wiring connections to the sentry 50 are made through an onboard, screwtype terminal block. Since the sentry 50 does not use an electromechanical or mercurywetted relay, there are no constraints as to the mounting position or orientation. Series 86, 87 coil data and type numbers device type type number series 88 type number series 89 coil v coil resistance max. Low and stable contact resistance during life, no bounce. Replacementcrossover of mercury relay contactors crydom 3rhp series, ac input, 3 phase hybrid solid state contactor, 4050 amp output, 280 or 600 vac a replacement for mercury. Pickering series 86, 87 high sensitivity reed relays.
The contacts of a standard mercury displacement relay or contactor. Prolonged contact may lead to ulceration of the skin. Usually, repeated operation of a relay will cause the contact resistance to increase gradually over time. High performance reed type 159160 the mercurywetted contact relay represents one of the more, only major weakness of a mercurywetted contact relay is the necessity to mount the relay within 30, mercurywetted contact relay on the market, the basic contact element has essential concepts in common. An electrode of this type of relay when not in contact presents a smooth rounded surface which for this discussion will. How reed relays work the item reed relay covers dry reed relays and mercury wetted contact relays, all of which use hermetically sealed reed switches. Hgrm55211ico magnetic reed relay mercury wetted contact. Pickering reed relays high power reed relay applications. Series 86, 87 switch ratings the contact ratings for each switch type are shown below. The pickering series 100 is a complete range of singlein line sil reed relays primarily intended for direct drive from 4000b cmos or nmos logic or similar low current sources. It is a form of reed relay in which the contacts are. Hallicrafters ha1 operating and service instructions pdf.
1311 83 173 703 1258 1292 399 1263 368 244 1200 448 1003 1397 694 119 681 252 101 1352 615 60 1082 819 1163 123 448 1575 404 1030 423 392 1073 821 780 111 1052 239 553 991 950 940 1371 216