Specializing in producing mercury relays and other mercury related products. The dimensions are such that only a limited amount of mercury. A mercurywetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. Pickering series 80, 85, 88, 89 general purpose reed relays. Mercury reduces the contact resistance and mitigates the associated voltage drop. Mercury displacement relay dry magnetic reed, electromechanical, and solidstate relays. One of the electrodes has an associated reed for making and breaking contact with the other of said electrodes. Prolonged contact may lead to ulceration of the skin. Mercurywetted contact relays mercurywetted contact relays consist of glassencapsulated reed with its base immersed in a pool of mercury and the other end capable of moving between one or two stationary contact. 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. Material safety datasheet identification of the product.
Mercury relay includes, but is not limited to, mercury displacement relays, mercury wetted reed relays, and mercury contact relays. Mercury contactors solid state relays liquid level control. Mercury wetted contacts reed relays engineering360. In the known mercury wetted reed switches the mercury is contained in a small. Mercury wetted reed relays datasheet standard dil14 1 form a 3582. A useful tip 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.
Mercury wetted matrix relays manufactured by the adams and westlake company were initially used in the palisades plant. Mercury wetted reed relays datasheet standard dil14 1. Mercury displacement industries or known better as mdi inc. Fo, faa series elo series mercury wetted switches types. Microrelays with bidirectional electrothermal electromagnetic. The only major weakness of a mercurywetted contact relay is the necessity to mount the relay within 30 of a vertical position, due to its position sensitivity. Series 86, 87 coil data and type numbers device type type number series 88 type number series 89 coil v coil resistance max. Some types of reed relay use mercury wetted contacts, consequently reed relays that. Custom mercury wetted relays available in 1a, 2a, 1c, 2c mercury wet and standard dry reeds are constructed using a bobbin of special design meeting ulg4vo. Msds mercury relays, mercury contactor, high voltage. They are used as highcurrent switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. Series 86, 87 switch ratings the contact ratings for each switch type are shown below.
When the coil is powered causing a magnetic field, the plunger assembly inside the glass capsule is pulled down into the mercury pool, which is in turn displaced and. Open frame, encapsulated and axial lead packages are. The sentry 30e isolation relay bistable input accepts one form c open collector or relay contact input and provides up to three isolated bistable outputs. Material safety datasheet identification of the product and. A mercury wetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. The products we offer are highly reliable, long lasting, and feature hermetically sealed selfrenewing contacts. After life disposal, mercury wetted relays must be recycled or disposed of as hazardous waste and in compliance with federal, state and local regulations. The item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. A mercury relay is a relay that uses mercury as the switching element.
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. 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 schedules for replacing the mercurywetted relays with qualified. Mercury displacement relay mercury wetted relay mercury contact relay photo source. In the known mercury wetted reed switches the mercury is contained in a small tank and consequently they have to be kept in a vertical position. Thus, in effect, the mercury wetted contact relay provides a new contact surface for each closure. Safety data sheet according to the federal final rule of hazard communication revised in 2012 hazcom 2012 date of issue. Mercury wetted relays these relays provide high voltage switching capability up to 500v and low contact resistance typically on the order of 30m switching high voltage signals ideal for testing devices involving higher voltages up to 500v.
Miniature reed relays with mercury wetted contacts. For high speed use, the mercurywetted relay is used instead. High sensitivity reed relays pickering electronics. Relays are products or devices that open or close electrical contacts to control the. They are used as highcurrent switches or contactors, where contact erosion. Dry and mercury wetted switches are available with the same pin. Tilt it and the little glob of mercury inside makes an electrical connection. Sentry 30e isolation relay the vision metering sentry 30e is the all solid. Chapter1 relay thisarticleisabouttheelectricalcomponent. Clare model hg2x1011 mercury wetted matrix relays in the rps. Table 1 illustrates that the amount of mercury used in individual switches and relays varies widely. Mercury wetted reed relays datasheet standard dil14 1 form a.
Gmvs2, gmvs4, gmvs6, gmvs7 series hgzm, mhce, cup, mhmg series grma 20000 series 2420, 2920 series 72xx series 3520, 3582, 3585 series 3880, 3885 series 1200 series 1203 08 mercury wetted sensors types. 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. The other electrode has a hollow tubular structure filled with mercury. The capsule is surrounded by an electromagnetic coil and. The 4511 has been designed with several exceptional features that make it stand out from competitive products. Aug 14, 1979 a mercury wetted reed switch comprises two metal reeds enclosed in a glass capsule and which are wetted with mercury such that the latter is the effective contact material. The mercury wetted relays in the range may be driven directly from ttl logic. 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 contact, or for highspeed.
Such a combination also minimizes contact interface resistance and material transfer. Upon detecting a failed relay, the failed unit shall be replaced with a qualified drycontact relay or a new mercurywetted relay. A mercury displacement contactor ideally runs 38 million overall cycles. Get the best deals on mercury industrial automation relays when you shop the largest online selection at. Contact resistance versus carryingcurrent of a relay with liquid metal wetted contact. Dpdt2amp mercury wetted contacts dual 1125ohm coilbistable latching 12vdc to 63vdc vertical operationpossibly removed from boards, traces of solder on very few leads. Such relays are used to switch lowvoltage signals one volt or less. Mercury can be irritating to contaminated skin and eye. 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. Us3643185a mercurywetted relay and method of manufacture. Mdi quietly became a leader for both relay and float switches. 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.
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. Aug 17, 2010 tilt it and the little glob of mercury inside makes an electrical connection. Mercury wetted contacts are fast in operation and have relatively good load carrying capacity and long life. A mercury relay mercury displacement relay, mercury contactor is a relay that uses mercury as the switching element. 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. Shortterm overexposures to high concentrations of mercury.
Following are the features of the mercury wetted reed relays. Therefore, excellent electrical isolation is achieved between the originating device and up to three end devices. The mercury films are stretchable, there is no contact bounce and because it is a mercury contact, the contact resistance is very low and. High voltage silsip reed relays rapidonline rapid electronics. How reed relays work the item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. 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. The mercury films are reestablished at each contact closure and contact erosion is eliminated. Mercury contactors liquid level control float switches. The contacts of these relays are wetted with mercury, which is used to reduce the contact resistance and voltage drop.
Close up of liquid metal wetted contact as fabricated. Three hermeticallysealed glass capsules inside a single coil inside an elevenpin metal can. In 1990, mdi added mercury floats to its list of manufactured products. Midland ross mercury wetted contact relay demo youtube. View datasheet instrumentation grade hg dip reed relay mss2 mvs2 from comus international. Basically, a mercury wetted contact relay consists of one or more glass switch capsules surrounded by a coil. Midland ross 160351moo mercury wetted contact relay. 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.
Normally closed mercury relay, with coil around top of tube and adjustable angle. The advantage of a mercury wetted contact is that bouncing is avoided when the contacts close, that contact resistance remains very low throughout the useful life. Mercuryadded switches and relays in consumer products. When used 24 hours a day in a heater application, there may be 3 million onoff cycles in a single year. Mercury can be irritating to contaminated skin and eyes. A mercury to mercury contact is maintained in the closed position. Mercury industrial automation relays for sale ebay. Mdi relays are hermetically sealed with high quality glass to metal seals and the stainless steel tube is totally encapsulated in ul approved epoxy. 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. When an internal diode is required, the suffix d is added to the part number as shown in the table. A mercurywetted reed switch comprises two metal reeds enclosed in a glass capsule and which are wetted with mercury such that the latter is the effective contact material.
Mercury will cling to the surface of any clean metal, and is used as the contacts in mercury wetted reed relays. Mercury relay means a mercuryadded product or device that opens or closes electrical contacts to effect the operation of other devices in the same or another electrical circuit. This relay is a transfer arrangement comprising mercury wetted contacts sealed in a hydrogen atmosphere at 250 pounds pressure. A mercurywetted reed relay is a form of reed relay in which the contacts are wetted with mercury. This combines the speed of a lowmass relay, together with. Got our start in 1975 as a small family owned business. 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. Low and stable contact resistance during life, no bounce. After usage, it can be seen that the liquid metal has contacted opposing electrode and have been deformed. Mercury will cling to the surface of any clean metal, and is used as the contacts in mercurywetted reed relays. This module provides high voltage carrying capability as well as very low and consistent contact resistance. 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 though modern.
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. 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. We are having problems with our mercury wetted relays that we use on our io board. Model 4511 32 spdt mercury wetted relays product description the 4511 provides 32 spdt mercury wetted relay channels. Make offer potter and brumfield mercury wetted contact relay jml116081 used.
Pickering series 86, 87 high sensitivity reed relays. They seem to stick open randomly after one use or many uses, doesnt matter. Rhodium switches are used in all if required to meet specific well defined application. 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. How reed relays work dry reed relays mercurywetted contact.
Mercury relays, mercury contactor, high voltage relay and. When the coil is powered causing a magnetic field, the plunger assembly inside the glass capsule is pulled down into the mercury pool, which is in turn displaced and moved up to make the contact with the electrodes. While there are several variations of the mercurywetted contact relay on the market, the basic contact element has essential concepts in common. In both types, the reeds thin, flat blades serve multiple functions.
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