Relays were fine for lowcurrent applications until people started whining about mercury wetted contacts. Well anyway i have redrawn my circuit so the magnitude of voltage and current are more easy to understand. Colloidal mercury, quick silver, liquid silver, ncic60399, hydrargyrum 1. Operate voltage, release voltage, and coil resistance will change approximately 0. Nov 30, 2017 a relay that uses mercury to create an electrically conducting path between contacts. Dry contacts means a relay that does not use mercury wetted contacts. Such relays are used to switch lowvoltage signals one volt or less where the mercury reduces the contact. Specializing in producing mercury relays and other mercury related products. Reconfigurable surfaces for energy transmission contacts. Got our start in 1975 as a small family owned business. This module provides high voltage carrying capability as well as very low and consistent contact. In both types, the reeds thin, flat blades serve multiple functions. Mercury reduces the contact resistance and mitigates the associated voltage drop.
The dc resistance of closed contacts as measured at their associated contact terminals. Mercury contactor relays surplus sales of nebraska. Mercury displacement industries or known better as mdi inc. Wet contacts aremercury wetted, which gives certain operational advantages. The mercurywetted relay contact rating is 5 amperes maximum, or 500 volts maximum, the product not to exceed 250 voltamperes with contact protection. The 4511 has been designed with several exceptional features that make it stand out from competitive products. Mercury wetted relays should be mounted vertically in the direction of the arrow printed on the package. These ranges of reed relays are essentially the same as the dry. 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. 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. Normally closed mercury relay, with coil around top of tube and adjustable angle. Msds mercury relays, mercury contactor, high voltage. Relay contacts are available in a variety of metals and alloys, sizes and styles. 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.
This combines the speed of a lowmass relay, together with the fast wetting of mercury contacts. Mercury relay includes, but is not limited to, mercury displacement relays, mercury wetted reed relays, and mercury contact relays. Variation in contact resistance during the period in which contacts are in motion after closing. A mercury wetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. Some types of reed relay use mercury wetted contacts, consequently reed relays that use plated contacts are often referred to as dry reed relays. Mercury wetted contacts reed relays engineering360. Hgrm55211ico magnetic reed relay mercury wetted contact. While there are several variations of the mercurywetted contact relay on the market, the basic contact element has essential concepts in common. If technically feasible, cold switching is the best method for maximizing contact. Mercury wetted relay a mercury wetted relay is a form of reed relay in which the contacts are wetted with mercury. Mercury can be irritating to contaminated skin and eye. 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. Mercury wetted reed relays datasheet standard dil14 1 form a 3582. Basically, a mercury wetted contact relay consists of one or more glass switch capsules surrounded by a coil.
Series 80, 85 switch ratings the contact ratings for. Prolonged contact may lead to ulceration of the skin. The contacts of a standard mercury displacement relay or contactor. Taking inspiration from 1940s mercurywetted electrical contact relays and current nanoparticle organic. Series 86, 87 coil data and type numbers device type type number series 88 type number series 89 coil v coil resistance max. How reed relays work the item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. Safety data sheet according to the federal final rule of hazard communication revised in 2012 hazcom 2012 date of issue. 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.
The metals can be added by selective plating or by sputtering processes. 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 contactors solid state relays liquid level control. It has good electrical conductivity and, being liquid, there is no material transfer buildup from contact to contact. Pickering series 86, 87 high sensitivity reed relays. The mercury wetted relay is a power version of the dryreed switch. Mdi relays are hermetically sealed with high quality glass to metal seals and the stainless steel tube is totally encapsulated in ul approved epoxy. Must take into account bounce, operate and release time. In the known mercury wetted reed switches the mercury. In both types, the reeds thin, flat blades serve multiple functions as conductor, contacts, springs, and magnetic armatures. 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. 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. The term reed relay covers dry reed relays and mercury wetted contact relays, all of which use hermetically sealed reed switches.
The products we offer are highly reliable, long lasting, and feature hermetically sealed selfrenewing contacts. A mercury relay mercury displacement relay, mercury contactor is a relay that uses mercury as the switching element. Silver or silverplated contacts are used for signal switching. Chapter1 relay thisarticleisabouttheelectricalcomponent. Mercury relays, mercury contactor, high voltage relay and. Where the reed blade passes through the glass envelope any. Mercurywetted relays make and break circuits using a thin, selfrenewing film of liquid mercury. Mercury will cling to the surface of any clean metal, and is used as the contacts in mercury wetted reed relays.
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. Midland ross 160351moo mercury wetted contact relay. Besides i also prefer to take environmental considerations. Mdi quietly became a leader for both relay and float switches. Jul 31, 2009 first off all i can agree that a mercury wetted relay perhaps is the best. Mvs7 4 pin dip wetted contacts 3 mvs2 8 pin dip wetted 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. Apr 07, 2017 in my researches related to my 1hz pulse to square wave conversion, ive run across what looks like an ideal component part.
Jm series mercury wetted contact relays dunn ohms 10 15 25 65 65 100 150 230 230 390 390 645 645 700 900 1400 2400 3500 4000 6500 0 14000 23000 58000 10 15 25 40 65 100 150 230. A circuit design that ensures the relay contacts are fully closed before the switched load is applied. How reed relays work dry reed relays mercurywetted contact. For highspeed use, the mercurywetted relay is used instead.
A form of reed switch in which the reeds and contacts are wetted by a film of mercury obtained by a capillary action from a mercury pool encapsulated within the reed switch. With mercury wetted contact relays, wide ranges of signal and power levels can be reliably switched without having the nature of the load affect either contact life or performance. They are used as highcurrent switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. Taking inspiration from 1940s mercury wetted electrical contact relays and current nanoparticle organic solutions, here we demonstrate that nobel metal nanoparticle liquids npls provide. Mercury can be irritating to contaminated skin and eyes. Media in category mercury relays the following 5 files are in this category, out of 5 total. 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. 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.
This module provides high voltage carrying capability as well as very low and consistent contact resistance. Us3144533a us180090a us18009062a us3144533a us 3144533 a us3144533 a us 3144533a us 180090 a us180090 a us 180090a us 18009062 a us18009062 a us 18009062a us 3144533 a us3144533 a us 3144533a authority us united states prior art keywords mercury shuttle switch contact. Mercury wetted reed relays datasheet standard dil14 1. Known file sizes on windows 1087xp are 761,344 bytes 50% of all occurrences or 585,728 bytes. Series 86, 87 switch ratings the contact ratings for each switch type are shown below.
The item reed relay covers dry reed relays and mercurywetted contact relays, all of which use hermetically sealed reed switches. 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. 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. Mercury wetted relays are also hermetically sealed and have no bounce on outputs and offer a clean switch. Apparently they were used in keyers back in the 1950s and are still available on the surplus market. Shortterm overexposures to high concentrations of mercury. Mercury wetted reed relays datasheet standard dil14 1 form a. Dry and mercury wetted switches are available with the same pin. For switching currents lower than 10a, we recommend using high insulation resistance, mercury wetted reed relays. Such relays are used to switch lowvoltage signals one volt or less. Mercury wetted reed relays comus international bvba.
Mercuryadded switches and relays in consumer products. Under section 301c2 of the trade expansion act of 1962. Mercury wetted relay a mercury wetted reed relay is a form of reed relay in which the contacts are wetted with mercury. The switch in this type of relay must be mounted vertically. For switching 1uv signals, reed relays may be an option being small and sealed, but there is contact bounce. I have used mercury wetted contact relays for audio stuff and never had any issues whatsoever even with older used relays as long as they were good. Mercury wetted reed relays datasheet standard dil14 1 form a 3585. For example, the maximum allowable voltage with a 5ampere load is 50 volts 5 a. This fact sheet summarizes the use of mercury in switches and relays sold as individual. A relay that uses mercury to create an electrically conducting path between contacts. Dry reed relays dry reed relays have become an important factor in the relay. 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. Mercury relays are known for being durable and handling difficult and dirty environments. But i have to depend on my local electronic part shop.
The mercury wetted relays in the range may be driven directly from ttl logic. These relays feature long life and high contact reliability because the mercury recoats the contacts on every operation. It includes the total amount of mercury in all products that were sold in the u. 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. Jan 20, 2017 mercurywetted relay a mercurywetted relay is a form of reed relay in which the contacts are wetted with mercury. For 220 vac aromat jw2endc12v g5l114pps omron scr 12v 10amps w97cpx2 jw1fendc12v cp clare relay mercury wetted clare mercury mercury wetted contact relay. High sensitivity reed relays pickering electronics. Model 4511 32 spdt mercury wetted relays product description the 4511 provides 32 spdt mercury wetted relay channels. Such relays are used to switch lowvoltage signals one volt or less because of its low contact resistance, or for highspeed counting and timing applications where the mercury eliminates contact. In 1990, mdi added mercury floats to its list of manufactured products.
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