MEDIUM-MU AIR-COOLED POWER TRIODE 3CX15,000H3

2y ago
10 Views
2 Downloads
750.69 KB
6 Pages
Last View : 7d ago
Last Download : 2m ago
Upload by : Averie Goad
Transcription

TECHNICAL DATAMEDIUM-MUAIR-COOLEDPOWER TRIODE3CX15,000H3The EIMAC 3CX15,000H3 is an air cooled, ceramic-metal, medium-mu power triode designed primarily for use inbroadcast and industrial radio-frequency heating services. Its air-cooled anode is rated at 15 kW of platedissipation.Full ratings apply up to 90 MHz. Plentiful reserve emission is available from its one kilowatt filament. The gridstructure is rated at 500 watts making this tube an excellent choice for severe applications.GENERAL CHARACTERISTICS1ELECTRICALFilament: Thoriated TungstenVoltage . 6.3 0.3 VCurrent @ 6.3 Volts . 156 AAmplification Factor, Average . 20Direct Interelectrode Capacitances (grounded cathode)MECHANICALMaximum Overall Dimensions:Length (Excluding Leads) 8.75 in; 222.25 mmDiameter . .7.05 in; 179.07 mmNet Weight .13 lbs.Operating Position.Vertical, base up or downMaximum Operating Temperature: . 250 CCooling: . Forced AirBase . See Outline2Cin . 60 pFCout . 2.5 pFCgp . 39 pFFrequency of Maximum Ratings (CW) . 90 MHz12Characteristics and operating values are based upon performance tests. These figures may change without notice as the result of additionaldata or product refinement. CPI Eimac Division should be consulted before using this information for final equipment design.Capacitance values are for a cold tube.1

RADIO FREQUENCY INDUSTRIAL OSCILLATORClass C (Filtered DC Power Supply)MAXIMUM RATINGS:DC ANODE VOLTAGE . 12DC GRID VOLTAGE .-1000DC ANODE CURRENT . 6.0DC GRID CURRENT . 1.0ANODE INPUT POWER . 60ANODE DISSIPATION . 15kVVAAkWkWTYPICAL OPERATION:*DC Anode Voltage7000 10,000 VDC Anode Current6.05.0 ADC Grid Voltage-600 -800 VDC Grid Current0.660 0.542 APeak Positive Grid Voltage440400 VDriving Power660650 WAnode Input Power4250 kWAnode Dissipation128.8 kWAnode Output Power3041.2 kWApproximate Load Impedance600 1025 Ohms* Loaded Conditions.NOTE: TYPICAL OPERATION data are obtained from direct measurement or by calculation from publishedcharacteristic curves. Adjustment of the rf grid voltage to obtain the specified anode current at the specifiedbias and anode voltages is assumed. If this procedure is followed, there will be little variation in output powerwhen the tube is changed, even though there may be some variation in grid current. The grid current whichresults when the desired anode current is obtained is incidental and may vary from tube to tube. This currentvariation causes no difficulty so long as the circuit maintains the correct voltage in the presence of thevariations in current. In the case of Class C Service, if grid bias is obtained principally by means of a gridresistor, the resistor must be adjustable to obtain the required bias voltage when the correct rf grid voltage isapplied.RANGE VALUES FOR EQUIPMENT DESIGNFilament Current @ 6.3 ctrode Capacitances (grounded cathode)Cin .Cout .Cgp.1Capacitance values are for a cold tube in accordance with Electronic Industries Association Standard RS-191.APPLICATIONMECHANICALHANDLING – These product contains a thoriated-tungstenfilament and should be protected from shock and vibration.It is recommended that the tube be removed fromequipment that is being shipped, to prevent damage thatmay occur in transit.STORAGE – If a tube is to be stored as a spare it shouldbe kept in its original shipping carton, with the originalpacking material, to minimize the possibility of handlingdamage. Before storage a new tube should be operatedin the equipment for 100 to 200 hours to establish it hasnot been damaged and operates properly (see FilamentOperation for recommendations on initial value of filamentvoltage during this operation period). If the tube is stillin storage 6 months later, it again should be operated inthe equipment for 100 to 200 hours to make sure there hasbeen no degradation. If operation is satisfactory, the tubecan again be stored with great assurance of being aknown-good spare.MOUNTING - The 3CX15,000H3 must be operated with itsaxis vertical. The base of the tube may be down or up atthe convenience of the circuit designer. A grid contactflange is provided for bolting to a strap or a grid deck.Heavy flexible leads are provided for applying the filamentvoltage.COOLING - The maximum temperature rating for the3CX15,000H3 is 250ºC. Sufficient forced-air circulation

3CX15,000H3must be provided to keep the temperature of the anode atthe base of the cooling fins and the temperature of theceramic-metal seals below 250ºC. Air-flow requirements tomaintain seal temperature at 225ºC in 50ºC ambient air aretabulated below (for operation below 30 MHz.few tenths of a volt above the value where performancedegradation was noted for operation. The operating pointshould be rechecked after 24 hours.Filament voltage should be closely regulated when voltageis to be reduced below nominal in this manner, to avoidany adverse influence by normal line voltage variations.Filament voltage should be measured at the tube base orsocket, using an accurate rms-responding meter.(Anode to Base Air Flow)SEA LEVEL5,000 FEETAnode*Dissipation Air Drop(In. of Water)1.633.2610.00Air Flow(CFM)4337281510PressureDrop(In. of Water)Periodically throughout the life of the tube the procedureoutlined above for reduction of voltage should be repeated,with voltage reset as required, to assure best tube life.1.963.9212.00Eimac Application Bulletin #18 titled “EXTENDINGTRANSMITTER TUBE LIFE” contains valuable informationand is available on request.*Since the power dissipated by the filament represents about 1100watts and since grid dissipation can, under some conditionsrepresent another 500 watts, allowance has been made inpreparing this tabulation for an additional 1600 watts.IN-RUSH – When cold, the resistance of a thoriatedtungsten filament is very low, therefore the initial starting(in-rush) current when filament voltage is applied can bemany times the normal (hot) current; this can bedetrimental to the longevity of a filament structure.Filament in-rush current should never exceed a value oftwice the nominal rated current. The use of a specialimpedance-limited filament transformer or other “step-start”circuitry in the supply side (primary) of the filamenttransformer is recommended.Additional stem cooling air must be provided. 16 CFMof air directed against the center filament contact ring ½”below the outer filament contact ring by a 1-1/2” I.D. airduct arranged at a 45º angle with the center line of the tubewill provide adequate cooling for maximum frequency of 30MHz, 50ºC ambient, and 5000 ft. altitude.ELECTRICALCONTROL GRID OPERATION – The grid current rating isone ampere dc. This value should not be exceeded formore than very short periods such as during tuning. Overcurrent protection in the grid circuit should be provided.Ordinarily it will not be necessary to operate with more than0.4 to 0.7 amperes grid current to obtain reasonableefficiency. In industrial heating service with varying loads,grid current should be monitored continuously with a dccurrent meter. The maximum grid dissipation rating is 500watts.FILAMENT OPERATION – For the 3CX15,000H3 the ratedfilament voltage is 6.3 volts.Filament voltage, asmeasured at the socket, should be maintained at 6.3 voltsplus or minus five percent for long tube life and consistentperformance. Maximum life will be obtained by operationat minus 5 percent.This tube is designed for commercial service, with no morethan one normal off/on filament cycle per day. If additionalcycling is anticipated it is recommended the user contactApplication Engineering at CPI/Eimac for additionalinformation.ANODE OPERATION – Maximum anode voltage rating of12,000 volts and maximum anode current of 6.0 ampsshould not be applied simultaneously as rated anodedissipation may be exceeded.With a new tube, or one which has been in storage forsome period of time, operation with filament voltageonly, at the nominal value of 6.3 volts, applied for a periodof 30 to 60 minutes is recommended before full operationbegins. This allows the active getter material mountedwithin the filament structure to absorb any residual gasmolecules which have accumulated during storage. Oncenormal operation has been established a minimum filamentwarm-up time of five seconds is normally sufficient.Anode over-current protection should be provided toremove anode voltage quickly in the event of an over-loador an arc-over at the load. In addition current limitingpower supply resistors should be used. These precautionsare especially important in industrial service with its widevariations in loading.Spark gaps from anode to ground should be used toprevent transient voltages from flashing across the tubeenvelope during any fault conditions.At rated (nominal) filament voltage the peak emissioncapability of the tube is many times that needed forcommunication service. A reduction in filament voltage willlower the filament temperature, which will substantiallyincrease life expectancy. The correct value of filamentvoltage should be determined for the particular application.It is recommended the tube be operated at full nominalvoltage for an initial stabilization period of 100 to 200 hoursbefore any action is taken to operate at reduced voltage.The voltage should gradually be reduced until there is aslight degradation in performance (such as power outputor distortion). The voltage should then be increased aHIGH VOLTAGE - The 3CX15,000H3 operates at voltageswhich can be deadly, and the equipment must be designedproperly and operating precautions must be followed.Equipment must be designed so that no one can come incontact with high voltages. All equipment must includesafety enclosures for high-voltage circuits and terminals,with interlock switches to open the primary circuits of thepower supplies and to discharge high-voltage capacitorswhenever access doors are opened. Interlock switches3

3CX15,000H3must not be bypassed or “cheated” to allow operation withaccess doors open.Always remember that HIGHVOLTAGE CAN KILL.the manufacturer’s technical data, or test specifications,normally are taken in accordance with Standard RS-191.The equipment designer is therefore cautioned to makeallowance for the actual capacitance values which will existin any normal application. Measurements should be takenwith mounting which represents approximate final layout ifcapacitance values are highly significant in the design.INTERELECTRODE CAPACITANCE - The actual internalinterelectrode capacitance of a tube is influenced by manyvariables in most applications, such as stray capacitanceto the chassis, capacitance added by the connectorsused, stray capacitance between tube terminals, and wiringeffects. To control the actual capacitance values within thetube, as the key component involved, the industry and theMilitary Services use a standard test procedure asdescribed in Electronic Industries Association StandardRS-191. This requires the use of specially constructed testfixtures, which effectively shield all external tube leads fromeach other and eliminates any capacitance reading to“ground”. The test is performed on a cold tube; however,in the case of the 3CX15,000H3, no special shielded fixtureis used due to the length of the filament leads. Otherfactors being equal, controlling internal tube capacitance inthis way normally assures good interchangeability of tubesover a period of time, even when the tube may be made bydifferent manufacturers. The capacitance values shown inRADIO FREQUENCY RADIATION – Avoid exposure tostrong rf fields even at relatively low frequency. Absorptionof rf energy by human tissue is dependent on frequency.Under 30 MHz, most of the energy will pass completelythrough the human body with little attenuation or heatingeffect.Public health agencies are concerned with thehazard, however, even at these frequencies.SPECIAL APPLICATIONS - If it is desired to operatethese tubes under conditions widely differ from those givenhere, contact the Application Engineering Dept., CPI dations.OPERATING HAZARDSProper use and safe operating practices with respect to power tubes are the responsibility of equipmentmanufacturers and users of such tubes. All persons who work with and are exposed to power tubes, orequipment that utilizes such tubes, must take precautions to protect to protect themselves against possibleserious bodily injury. DO NOT BE CARELESS AROUND SUCH PRODUCTS.The operation of this tube may involve the following hazards, any one of which, in the absence of safe operatingpractices and precautions, could result in serious harm to personnel.HIGH VOLTAGE – Normal operating voltages can bedeadly. Remember that HIGH VOLTAGE CAN KILL.HOT WATER – Water used to cool tubes may reachscalding temperatures. Touching or rupture of thecooling system can cause serious burns.LOW-VOLTAGEHIGH-CURRENTCIRCUITSPersonal jewelry, such as rings, should not be wornwhen working with filament contacts or connectors as ashort circuit can produce very high current and melting,resulting in severe burns.HOT SURFACES – Surfaces of tubes can reachtemperatures of several hundred C and cause seriousburns if touched for several minutes after all power isremoved.RF RADIATION – Exposure to strong rf fields shouldbe avoided, even at relatively low frequencies. Thedangers of rf radiation are more severe at UHF andmicrowave frequencies and can cause serious bodilyand eye injuries. CARDIAC PACEMAKERS MAY BEEFFECTED.MATERIAL COMPLIANCE This product andpackage conforms to the conditions and limitationsspecified in 49CFR 173.424 for radioactive material,excepted package-instruments or articles, UN2910. Inaddition, this product and package contains noberyllium oxide (BeO).Please review the detailed Operating Hazards sheet enclosed with each tube, or request a copy from CPI, EimacDivision Application Engineering at 650/846-2800.4

3CX15,000H3

3CX15,000H3607 Hansen Way, Palo Alto, CA Tel: 650-846-2800 Fax: 650-846-379502/15 Printed in USA

IN-RUSH – When cold, the resistance of a thoriated-tungsten filament is very low, therefore the initial starting (in-rush) current when filament voltage is applied can be many times the normal (hot) current; this can be detrimental t

Related Documents:

Air Cooled Chiller Air Air 2 Air Air 6 AIR COOLED CHILLERS Air-cooled chillers are refrigeration machines that remove heat from cooling loads using chilled water and reject this heat into the atmosphere using refrigerant. THEY ALL HAVE fans, condenser coils, and compressors. Air-cooled chillers are used to provide cooling for human comfort and electronic equipment as well as industrial process .

Maximum Series portable chillers can be used on a variety of process applications that require 20 F to 80 F chilled water. MAXIMUM SERIES † Air & Water-Cooled † 1/4 to 40 Tons † 20 F to 80 F † Using Non-Ozone Depleting Refrigerants 10 ton air-cooled model 10 ton water-cooled model 2 ton water-cooled model 1 ton air-cooled model

Apr 20, 2016 · Marine & Freshwater Finfish Aquaculture Low Medium Medium Medium Dams Low Medium Medium Medium Logging & Wood Harvesting (Timber Production) High Medium Medium Oil Spills Medium Medium Medium Medium Marine shellfish aquaculture

ACH Air-Cooled, Horizontal Air Flow ACV Air-Cooled, Vertical Air Flow ACR Air-Cooled Remote Condenser WCC Water-Cooled Condenser Digit 6 — Chilled Water System P Recirculating System, Tank and Pump M Single Pass Chiller Unit (no tank and pump) Digit 7 — Cabinet Type H Horizontal Low Profile V Vertical Upright

Vanguard Air-Cooled V-Twin Specifications Performance Curves 14 HP Vanguard Air-Cooled V-Twin 16 HP Vanguard Air-Cooled V-Twin 15.0 5.2 Kilowatt 7.5 8.2 9.0 9.7 10.4 111.2 111.9 14.0 13.0 12.0 11.0 10.0 9.0 8.0 7.0 16.0 6.7 6.0 HP 1800 2000 2200 24002600 2800 3000 3200 3400 3600 17.0 12.7 REVOLUTIONS PER MINUTE RATED GROSS BHP MAXIMUM .

EWY Air-cooled chiller, heat pump EWL Remote condenser chiller ERA Air cooled condensing unit EWW Water-cooled chiller, cooling only EWC Air-cooled chiller, cooling only with centrifugal fan EWT Air-cooled chiller, cooling only with heat recovery Refrigerant D R-134a P R-407c Q R-410a Capacity class in kW (Cooling) Always 3 .

AIR-COOLED Air-Cooled chillers utilize plant ambient air to extract heat from the refrigeration circuit. Fan or blowers move the plant air across generously sized finned condenser coils to permit full rated capacity at design conditions. WATER-COOLED Water-Cooled chillers utilize a secondary plant water source such as cooling tower or city .

Air-Cooled Chiller The use of air-cooled chillers in process and comfort cooling applications has been steadily increasing in recent years. The air-cooled chiller has evolved from a packaged product, with few options, to a fully customizable unit that can be tailored to meet specific application and job site requirements. High-efficiency air-cooled