Installation Guide
Contents
1. 40 Volt Ordinary Potable 220 Volt Ordinary Soft 360 Volt Ordinary Condensate 480 Volt Puri ed Distilled 800 Volt or 5200 H Relay Puri ed Deionized Use 5200 H Relay Zinc Chloride 40 Volt2. 40 Volt Blood 220 Volt Borax Up to 10 220 Volt Greater than 10 90 Volt Boric Acid 220 Volt Bread Dough 90 Volt Buttermilk 24 or 40 Volt Cadmium Chloride 40 Volt Cake Batter 220 Volt Calcium Chloride 40 Volt Calcium Hydroxide 220 Volt Carbolic Acid Up to 90 220 Volt 90 to 100 Use 5200 H or 5400 Relay Catsup 90 Volt Caustic Soda Sodium Hydroxide 40 Volt Cement Slurry 220 Volt Chromic Acid 40 Volt Citric Acid 40 or 90 Volt Coffee 90 Volt Condensate Ordinary Water 480 Volt D I Water Use 5200 H Relay Corn Syrup 480 Volt Corn Cream Style
3. 90 Volt 75 to 90 220 Volt Glacial Use 5200 H Relay Acetone Use 5200 H 5300 or 5400 Relay Acids General 40 or 90 Volt Anhydrous Use 5200 H Relay Alcohols Use 5200 H 5300 or 5400 Relay Alkalies General 40 or 90 Volt Anhydrous Use 5200 H or 5400 Relay Alum Solutions 220 Volt Aluminum Sulphate 90 Volt Aluminum Hydroxide 90 Volt Amino Acids 90 Volt Ammonia Anhydrous Liquid Use 5200 H Relay Ammonium Chloride 40 Volt Ammonium Hydroxide Ammonia 220 Volt Ammonium Nitrate Use 5300 or 5400 Relay Ammonium Sulphate 220 Volt Baby Foods 90 Volt Barium Chloride 40 Volt Barium Nitrate 40 Volt Beer 90 Volt Black Liquor
4. 90 Volt Ethylene Glycol Use 5200 H or 5400 Relay Ferric Chloride 90 or 220 Volt Ferrous Sulphate 220 Volt Liquid Description Secondary Coil Formaldehyde Use 5200 H Relay Formic Acid Up to 75 90 Volt 75 to 90 220 Volt Glycerine Glycerol Use 5200 H Relay Hydrochloric Acid 40 Volt Hydro uoric Acid Up to 20 220 Volt Above 20 40 Volt Hydro uorsilicic Acid 90 Volt Hydrogen Peroxide Use 5200 H 5300 or 5510 Relay Jams amp Jellies 360 Volt Juices Fruit amp Vegetable 40 or 90 Volt Lemon Oil Essence Use 5200 H Relay Lignite 800 Volt Lithium Chloride 40 Volt Magnesium Hydroxide 90 Volt Mayonnaise 220 Volt Methanol Use 5200 H or 5300 Relay Me
5. B ENERGIZED 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD A LOAD B TO ISOLATED LOAD CIRCUIT A B GROUND 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT A amp B OPEN ABOVE THIS LEVEL LOAD CIRCUIT A amp B CLOSE BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOADS A amp B ENERGIZED BELOW THIS LEVEL LOADS A amp B DE ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD B LOAD A TO ISOLATED LOAD CIRCUIT B A GROUND Catalog Numbering System All contacts rated at 25 Amp Resistive at 120 240 or 480 VAC 1 HP Single Phase at 120 or 240 VAC Heavy Duty Pilot 120 to 600 VAC 2 Amp Resistive at 120 VDC 10 Amp Resistive at 48 VDC 1500 A L1 S7 Contact Arrangements Normally Open Closed A 1 0 B 0 1 C 2 0 D 1 1 E 0 2 F 3 0 G 2 1 H 1 2 J 0 3 Catalog Section Line Voltage L1 110 120 Volts 50 60 HZ L2 208 240 Volts 50 60 HZ L3 440 480 Volts 50 60 HZ L4 550 600 Volts 50 60 HZ L5 Dual Voltage 120 240 Volts 50 60 HZ Secondary Coil Voltage Typical Liquids S1 12 Volts A C Metallic circuits S2 24 Volts A C Metallic c
6. Size 18 or larger Type TW or THW wire is recommended for connection to the relay CAUTION Although the electrodes are connected to a low energy secondary coil output which has inherently low current there may be up to 800 volts between the electrodes or from an electrode to ground See Secondary Coil Table Thus wiring and electrodes should be installed to protect personnel from accidental contact Ground A system ground return circuit is required from the indicated relay terminal to the liquid in order to complete the secondary circuit of relay Conduit should not be used Instead connection should be made directly to uninsulated metal tank or to metal pipe connected to tank below normal low liquid level In wells connect ground to pump or metallic water pipe For concrete wood or insulated tanks use an extra common electrode extending slightly below the longest operating electrode Secondary Coil Because the secondary voltage on all B W relays is an induced voltage generated within the relay itself the secondary coil should never be connected to any source of power Voltage of the secondary coil installed on a given relay is determined by conductivity of liquid to be controlled Load Connections B W relays are two wire control devices having load contacts rated at 1 hp single phase 115 or 230 volts AC or standard duty pilot rating up to 600 volts AC In operation load contacts act as a switch to open or close a circu
7. This magnetic ux induces a voltage in the secondary or electrode circuit coil No current can ow in this coil however until the circuit is completed between the electrodes Thus the electrode circuit voltage being generated within the relay has no connection with the power line The B W 1500 induction relay utilizes the liquid as an electrical conductor to complete the secondary circuit between the upper and lower electrodes Thus when the liquid contacts the upper electrode the resulting ow of current in this circuit sets up a bucking action in the lower bar of the core This action tends to divert lines of magnetic force to the core legs and sets up an attraction that pulls the armature in to contact with the legs as shown in Figure 2 This armature movement closes the electrode and load contacts The lower contacts on 1500 C Relays terminals 9 and 10 connect the secondary circuit to ground when liquid contacts the upper electrode and act as a holding circuit to maintain the relay in its closed position until the liquid falls below the lower electrode This holding circuit provides control of the relay over any desired range in the liquid level depending on the distance between the upper and lower electrodes The ow of current through the low energy secondary circuit is very small and varies with the voltage of the secondary coil The secondary coil is selected to operate over the resistance of the liquid being control
8. relay from dropping out on low liquid level If distance from holder to relay is relatively short the best way to check for a ground is to connect a replacement wire from relay to the electrode holder outside the conduit and test the relay for operation If it drops out properly it is safe to assume that a ground exists in the original lower electrode lead wire If relay is located a considerable distance from electrode holder check for ground as follows Disconnect power to relay Remove wires from terminals in electrode holder and allow them to stick up to eliminate possibility of contacting a grounded part Then turn on power to relay If relay pulls in a short is indicated between the electrode leads from both electrodes to ground or secondary coil is shorted internally If relay does not pull in short secondary coil with piece of insulated wire by bridging between relay terminal connections for upper and lower electrodes Relay should pull in when this connection is made and drop out when connection is broken If relay does not drop out a short to ground is indicated in lower electrode lead This ground may not be enough to pull in relay but it can be suf cient to hold relay in once it has been closed in normal operation If any of these conditions exist disconnect power to relay and replace grounded wires 2 Electrode Holder Excessive dirt or moisture over insulation at electrode holder or electrodes can cause faulty relay opera
9. this does not correct the condition the relay should be replaced with one having a higher voltage secondary coil C One Level Operation If a relay operates at one level only starting and stopping at one electrode check the following 1 Electrode Wires If wires between relay and electrodes are interchanged relay will not operate over range in level but from upper electrode only To correct simply reverse connections either at relay or at electrodes 2 Ground Connection Poor ground connection will prevent holding circuit from functioning and cause relay to operate from the upper electrode only This can be easily corrected by making sure that ground connections conform with Installation Instructions 3 Holding Circuit If the holding circuit is not closing the relay will operate from the upper electrode only Since the holding circuit contact carries only a small current a slight lm of grease or dirt can sometimes prevent proper closure To correct rub contact surface with a clean paper Do not use sand paper or emery cloth 4 Upper Electrode Lead A ground in lead wire to the upper electrode will cause relay to operate from lower electrode only This condition can be checked out as described below D Relay Will Not Drop Out If relay will not drop out when liquid falls below lower electrode check the following points 1 Lower Electrode Lead A ground in the lead wire from relay to lower electrode will prevent
10. 1 1500 Induction Control Relays 1500 Series INSTALLATION amp SERVICE MANUAL Principle of Operation A B W oatless liquid level control system consists of a relay of the proper type a holder designed to support one or more electrodes or probes in the liquid container and the corrosion resistant electrodes themselves In as much as all B W induction relays are quite similar differing only in contact arrangement the following description of how a 1500 C Relay functions on a pump down control application will serve to explain the design construction and operating principles for the entire line As shown in diagrams below the laminated core of the relay is shaped The primary coil is assembled to the upper bar of the core and the secondary coil for the electrode is placed on the lower bar An armature located below the legs of the core is connected to an insulated arm carrying the movable contacts When the armature is raised these contacts close or open the motor and electrode circuits depending upon whether the contacts are normally open or closed Contacts shown normally open in this example When a source of alternating current is connected to the primary coil at terminals 3 and 4 the primary coil sets up a magnetic ux which circulates through the shortest path following the lines of least resistance As shown in Figure 1 this is through the lower bar of the laminated core on which the secondary coil is mounted
11. 2 N O 1 N C 1 N O 2 N C 3 N C 3 N O TOP CONTACT TERMINALS 1 amp 2 MIDDLE CONTACT TERMINALS 5 amp 6 BOTTOM CONTACT TERMINALS 9 amp 10 N O N O N C For a N O contact install the moveable contact in the armature assembly facing toward the top of the relay away from the armature For a N C contact install the moveable contact in the armature assembly facing toward the bottom of the relay toward the armature 3 INDUCTION RELAY CONTACT ARRANGEMENT WIRING DIAGRAM AND OPERATION DIRECT OPERATION PILOT OPERATION TYPICAL APPLICATIONS High Level Signal Control Low Level Cutoff when wired in series with Stop button in 3 wire pushbut ton stations Remote long distance and low voltage manual control applications etc Same as 1500 A Relay above except that an additional Normally Open contact is provided to permit simultaneous operation of different types of secondary signal devices in remote locations Low Level Signal Control High Level Cutoff when wired in series with Stop button in 3 wire pushbut ton stations Remote long distance and low voltage manual control applications etc Same as 1500 B Relay above except that an additional Normally Closed contact is provided to permit simultaneous operation of different types of secondary signal devices in remote locations High or Low Level Signal Control High of Low Level Cutoff when wired in series with St
12. 4 2 ELECTRODE HOLDER ELECTRODE LOAD GROUND 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT GROUND ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT A OPEN ABOVE THIS LEVEL B CLOSED LOAD CIRCUIT A CLOSED BELOW THIS LEVEL B OPEN LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD A ENERGIZED BELOW THIS LEVEL B DE ENERGIZED LOAD A DE ENERGIZED ABOVE THIS LEVEL B ENERGIZED 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD A LOAD B TO ISOLATED LOAD CIRCUIT A B 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT GROUND ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT A amp B OPEN ABOVE THIS LEVEL LOAD CIRCUIT A amp B CLOSED BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOADS A amp B ENERGIZED BELOW THIS LEVEL LOADS A amp B DE ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD B LOAD A TO ISOLATED LOAD CIRCUIT B A 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT CLOSED ABOVE THIS LEVEL LOAD CIRCUIT OPEN BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD DE ENERGIZED BELO
13. W THIS LEVEL LOAD ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD GROUND 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT OPEN ABOVE THIS LEVEL LOAD CIRCUIT CLOSED BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD ENERGIZED BELOW THIS LEVEL LOAD DE ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD GROUND 4 INDUCTION RELAY CONTACT ARRANGEMENT WIRING DIAGRAM AND OPERATION DIRECT OPERATION TYPICAL APPLICATIONS Same as 1500 D Relay above except that additional Normally Closed contact is provided to permit simultaneous operation of second pump Extra contact can also be used for signal purposes if desired Pump Up or Pump Down Control for same applications listed above for B W 1500 C and 1500 D Relays It is also suitable for use in controlling hydropneumatic tanks and motor ized valve installations 1500 H Relay Two Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 0 2 1 1500 G Relay Two Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 1 1 1 PILOT OPERATION CAUTION Electrodes are
14. and outside the pipe will be the same A small ow of water entering the top of the pipe will cause an outward ow of water from the bottom of the pipe and prevent undesirable material from entering Thus the electrodes have a clear surface on which to operate and will stay clean 7 Electrodes Too Short It is possible for an installation to be completed in which the upper electrode is suspended at a point where the liquid cannot make contact All installations should of course be checked to make sure that proper electrode lengths are provided B Noisy Relay Operation If the relay functions properly but is noisy in operation it could be caused by the following 1 Poor Electrode Connections If wire suspended electrodes are used and have either been lost or not properly connected resultant increase in resistance is secondary circuit may cause relay to buzz or chatter in operation This condition can be corrected by checking to see that proper electrode connections are made Excessive accumulation of dirt grease or other deposits on the electrodes can also result in noisy relay operation in which case periodic cleaning will eliminate the problem 2 Low Secondary Voltage If resistance of the liquid being controlled is at the upper end of the sensitivity range of the relay secondary coil noisy operation may result Sensitivity may be increased slightly by interchanging the ground and lower electrode connections at the relay If
15. azard and in these cases the B W Series 53 relay with FM approved intrinsically safe sensing circuit should be used See Catalog Section 5300 Liquids such as milk and beer and some pharmaceutical products will foam during processing The liquid phase is always a better conductor than the foam and when the interface level is to be detected the relay sensitivity must be carefully selected and it would be well to check the factory for our recommendation Copyright 2005 by AMETEK Automation amp Process Technologies 1080 N Crooks Road Clawson MI 48017 Toll Free 800 635 0289 Phone 248 435 0700 Fax 248 435 8120 www AMETEKAPT com With nearly 50 years of experience B W has compiled a history of applications in most major industries around the world If you have questions regarding the proper relay selection write us phone us or send a sample for test Chances are that we have the answer for you Typical Liquids The following recommendations are satisfactory for general use but because the conductivity of liquids varies greatly with concentration purity temperature and other factors some applications may require a different selection A number of the products listed are produced as solids such as crystals or powers and our relay selection is based on the normally used commercial solutions of these materials 511 1500 M4R 02 05 Z145 10M Liquid Description Secondary Coil Acetic Acid Up to 75
16. c 1500 D Relay Two Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 0 1 1 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT GROUND ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT CLOSED ABOVE THIS LEVEL LOAD CIRCUIT OPEN BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD DE ENERGIZED BELOW THIS LEVEL LOAD ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT GROUND ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT OPEN ABOVE THIS LEVEL LOAD CIRCUIT CLOSED BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD ENERGIZED BELOW THIS LEVEL LOAD DE ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT CLOSED ABOVE THIS LEVEL LOAD CIRCUIT OPEN BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOAD DE ENERGIZED BELOW THIS LEVEL LOAD ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6
17. ircuits S3 40 Volts A C Acid or caustic solutions Milk Brine and salt solutions Plating solutions Buttermilk Soups S4 90 Volts A C Weak acid or caustic solutions Beer Baby foods Fruit juices S7 220 Volts A C Sewage Most water except very soft Pottery slip Water soluble oil solutions Starch solutions S8 360 Volts A C Very soft water Sugar syrup S9 480 Volts A C Steam condensate Strong alcohol solutions S11 800 Volts A C Demineralized or distilled water OC Enclosure Type OC Open Chassis N1 NEMA 1 General Purpose N4 NEMA 4 Weather Proof N4X NEMA 4X Corrosion Resistant N7 NEMA 7 Classi ed Location N12 NEMA 12 Oil Tight X Additional Options X None M Manual Push Button 5 Service Instructions CAUTION Be sure to disconnect relay control power before servicing electrodes or electrode holders B W relays are designed and built to require a minimum of service in the eld Each one is tested and adjusted at the factory to insure positive operation and should not be altered or tampered with prior to installation If a relay does not operate properly after it has been installed the following information will be helpful in determining the probable cause A Relay Will Not Pull In If relay will not pull in when liquid contacts upper electrode failure to operate is probably caused by one of the following conditions 1 Power Failure A power failure
18. it Connecting them to an external load does not introduce a source of alternating current into the circuit Accordingly in making connections for direct operation of single phase loads within rated capacity of relay power connections must be made as shown in relay wiring diagram To operate higher rated single phase loads or three phase loads a magnetic starter must be used In making connections to motor starter follow directions given on the starter wiring diagram for connecting two wire control devices Field Replaceable and Convertible Contacts The Series 1500 Induction Relay provides circuit versatility by offering a contact kit that allows eld conversions from N O to N C or N C to N O contact arrangements This option also allows you to add or replace contacts up to 3 per relay as required for expansion of your liquid level control needs Remove cover plate and armature N O Contact N C Contact For a N O contact install the stationary contacts facing toward the bottom of the relay toward the armature For a N C contact install the stationary contacts facing in toward the top of the relay away from the armature Contact Kit Part No 15 000001 R 1 2 3 4 5 6 7 8 9 10 R Clawson Michigan 48017 U S A B W CONTROLS LINE VOLTAGE 50 60 Hz SECONDARY VOLTS 1500 CONTACT ARRANGEMENT CODE A B C D E F G H J 1 N O 1 N C 2 N O 1 N O 1 N C 2 N C
19. led Accordingly since there is a wide range of secondary coils from which to choose it is important that complete information regarding the nature of the liquid be furnished when ordering B W induction relays 3 5 7 9 8 10 6 4 FLUX ARMATURE 3 5 7 9 8 10 6 4 FLUX ARMATURE PUMP START ELECTRODE PUMP STOP ELECTRODE A C LINE TO MOTOR STARTER A GOOD DEPENDABLE GROUND RETURN CONNECTION TO THE LIQUID IS REQUIRED GROUND Figure 1 Secondary coil circuit open armature down Figure 2 Secondary coil circuit closed armature up PUMP START ELECTRODE TO MOTOR STARTER A GOOD DEPENDABLE GROUND RETURN CONNECTION TO THE LIQUID IS REQUIRED GROUND A C LINE PUMP STOP ELECTRODE 1500C Relay Used for Pump Down Control 2 Installation Instructions Relay Install relay in level upright position Connect wires from AC supply to terminals 3 and 4 on relay Make sure power is of same rated voltage and frequency as shown for connection to primary coil on relay data plate Relays draw 9 volt amperes Electrodes Install electrodes in tank or well by suspending them vertically from an electrode holder or some other suspending means One electrode should be set at desired start level and one at desired stop level For sewage or surface drainage sumps make sure electrodes are hung far enough apart so that foreign matter oating on water cannot foul electrodes
20. op button in 3 wire pushbutton stations Can also be used to interlock various types of signal devices Pump Down Control for sewage and sump pumps condensate return system etc Low Level Cutoff for submersible pumps Normally closed Solenoid Valve Control for discharging liquids from tanks etc 1500 A Relay Single Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 1 0 0 1500 C Relay Single Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 2 0 0 1500 B Relay Single Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 0 1 0 1500 E Relay Single Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 0 2 0 1500 D Relay Single Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 1 1 0 1500 C Relay Two Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 1 0 1 CAUTION Electrodes are terminals of live electrical circuits and must be installed to prevent accidental contact by personnel Control power must be disconnected before servicing A GOOD DEPENDABLE GROUND RETURN CONNECTION TO THE LIQUID IS REQUIRED Pump Up Control for supply pumps on elevated tanks and towers car bonators etc High Level Cutoff for pumps and valves Normally closed Solenoid Valve Control for plating tank and boiler make up et
21. t relay from operating Broken wires can be checked by shorting the upper and lower electrode leads together at the electrode holder If relay fails to pull in one or both of the electrode leads is open The individual leads can then be checked by running a temporary wire from the relay to holder outside conduit If relay pulls in it may be assumed that break is between the holder and the electrodes This can be checked by shorting between the electrode tips with an insulated jumper 5 Low Secondary Voltage If the secondary coil voltage is too low for the resistance or conductivity of the liquid being controlled the relay will not pull in or it will buzz and chatter before pulling in In either case the relay should be replaced with one which has a higher voltage secondary coil See Table If in doubt about proper coil selection furnish factory with details on liquid or send sample for test 6 Fouled Electrodes Accumulation of dirt grease or other deposits on the upper electrode will insulate it and prevent relay from pulling in If this occurs the electrodes should be inspected and cleaned at regular intervals as required to eliminate the dif culty If unusual quantities of oil grease or sludge and encountered the electrodes can be mounted inside a pipe that is ushed with clean water A 4 pipe should be used with the bottom located below the lowest water level and vent holes provided at top so that the level inside
22. terminals of live electrical circuits and must be installed to prevent accidental contact by personnel Control power must be disconnected before servicing A GOOD DEPENDABLE GROUND RETURN CONNECTION TO THE LIQUID IS REQUIRED Same as 1500 C Relay above except that additional Normally Open contact is provided to permit simultaneous operation of second pump Extra contact can also be used for signal purposes if desired 1500 F Relay Two Electrode Wiring Contact Arrangement Normally Normally Holding Open Closed Circuit 2 0 1 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT A amp B CLOSED ABOVE THIS LEVEL LOAD CIRCUIT A amp B OPEN BELOW THIS LEVEL LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOADS A amp B DE ENERGIZED BELOW THIS LEVEL LOADS A amp B ENERGIZED ABOVE THIS LEVEL 1 7 GROUND 9 5 3 VOLTAGE 8 10 SECONDARY VOLTAGE LINE 6 4 2 ELECTRODE HOLDER ELECTRODE LOAD B LOAD A TO ISOLATED LOAD CIRCUIT B A GROUND 1 3 5 7 9 2 4 6 8 10 A C LINE TO ISOLATED LOAD CIRCUIT ELECTRODE HOLDER ELECTRODE LOAD CIRCUIT A OPEN ABOVE THIS LEVEL B CLOSED LOAD CIRCUIT A CLOSED BELOW THIS LEVEL B OPEN LINE VOLTAGE VOLTAGE SECONDARY A C LINE LOADS A ENERGIZED BELOW THIS LEVEL B DE ENERGIZED LOAD A DE ENERGIZED ABOVE THIS LEVEL
23. thyl Ethyl Keystone MEK Use 5200 H Relay Milk 40 Volt Molasses 220 Volt Muriatic Acid 40 Volt Mustard 40 Volt Nitric Acid 40 or 90 Volt Orange Juice 90 Volt Paper Stock 220 Volt Penicillin 220 Volt Phosphoric Acid 40 Volt Plating Solutions 40 or 90 Volt Salts Chemical 40 or 90 Volt Sodium Carbonate Soda Ash 90 Volt Sodium Chloride Table Salt 40 Volt Sodium Hydroxide Caustic Soda 40 Volt Sodium Hypochlorate 40 Volt Sodium Silicate Water Glass 90 Volt Soups 40 Volt Starch Solutions 220 Volt Sugar Low Concentrations 220 Volt High Concentrations 360 Volt Sulphuric Acid 40 Volt Vinegar 90 Volt Water Sea
24. tion Interior of electrode holder and its underside should be kept clean and dry Conduit connections should be made so that no condensation can enter holder Underside of vertically mounted holders should never come in contact with the liquid Insulated rod electrodes should be used with horizontally mounted holders Electrodes should be kept relatively clean and free of dirt or grease Check them periodically to make sure they do not become fouled with oating debris or insulating deposits 3 Length of Lead Wires On installations with excessive distance over 900 feet between relay and tank relay may tend to hold in due to capacitance in electrode lines and fail to drop out when liquid leaves lower electrode Since there are a number of ways to achieve reliable long distance control complete information regarding such applications should be submitted to factory for recommendations 6 Conductive Liquids With the exception of products such as oil gasoline animal fats and other similar products most liquids and some moist bulk materials have suf cient conductivity to use B W level detecting relays The Series 1500 relay can be used on liquids with resistance up to about 90 000 ohm cm conductivity to 11 micromho cm For liquids with higher resistance the B W Series 52 relay described in Catalog Section 5200 must be used for applications up to 12 megohms resistance The vapor above some liquids is considered an explosive h
25. to relay can be caused by broken wire blown fuse an open switch loose screw corroded connection etc Check for power failure with voltmeter or test light directly on relay line terminals No 3 and 4 on all B W relays Also check voltage at motor starter line terminals and overload heaters on motor starter to be sure they have not tripped 2 Open Coils Coils used in B W relays very rarely fail unless struck by lightning or subjected to some severe over voltage condition To check coils disconnect electrode connections from relay terminals apply line voltage to the primary coil and touch both ends of secondary coil with an insulated jumper wire Relay should pull in when the jumper is connected and fall out when the jumper is removed Failure to do so indicates that one of the coils is open If an open coil is found contact dealer or the factory for a replacement relay 3 Poor Ground Connections B W induction relays that operate from a single electrode i e Types 1500 A C B E and D will not function unless a good dependable ground connection is made to complete the secondary circuit from one end of the secondary coil through the electrode and liquid and back through ground to the other side of the secondary coil If such a relay does not operate when liquid contacts the electrode check ground connection to be sure it complies with installation instructions 4 Broken Wires A broken wire from relay to either electrode will preven
Download Pdf Manuals
Related Search