Fisher 2500-249 Pneumatic Controllers and …

1 2500-249 Pneumatic Controllers andTransmittersTypical caged and cageless sensor/instrumentconfigurations are shown in figures 1 and 2. Cagedsensors (figure 3) provide more stable operationthan do cageless sensors (figure 4) for vessels withinternal obstructions or considerable internalturbulence. Cageless sensors are generally used onspecific gravity and interface control applicationsrequiring large displacers that are more easilyaccommodated by flange connections up to NPS availability of many different displacer stemlengths permits lowering the displacer down to themost advantageous depth in the Pneumatic Controllers and transmitters areused wherever rugged, dependable, and simplyconstructed displacer-style pneumaticinstrumentation is required in liquid level, interfacelevel, or density service. The ruggedness of theseproducts is demonstrated by their use in many kindsof demanding applications, including those in thepower, chemical process, oil and gas production,and petrochemical CAGED SENSORSMOUNT ON VESSEL SIDE WITHDISPLACER INSIDE CAGEW8334 CAGELESS SENSORS CAN MOUNTON VESSEL SIDE OR TOP WITH DISPLACER INSIDE VESSELFISHER L3 Pneumatic LEVEL controller (2500 CONTROLLERIN COMBINATION WITH A 249W SENSOR) CAN MOUNT ON VESSELTOP OR BE INSTALLED IN A CUSTOMER SUPPLIED CAGEW8679W9354-1 Figure 1.

2 Typical ConfigurationsProduct :2500D200037X012 May 20112500-249 Controllers and Transmitters2500-249 Controllers and TransmittersProduct :2500 May 2011 2 SpecificationsAvailable ConfigurationsSee tables 1, 5, and 6 Input SignalFluid Level or Fluid-to-Fluid Interface Level:From 0 to 100 percent of displacerlength standard lengths for all sensors areJ356 mm (14 inches) or J813 mm (32 inches);other lengths available depending on sensorconstructionFluid Density: From 0 to 100 percent ofdisplacement force change obtained with givendisplacer volume standard volumes areJ980 cm3 (60 inches3) for 249C and 249 CPsensors or J1640 cm3 (100 inches3) for mostother sensors; other volumes available dependingupon sensor constructionAllowable Specific GravitySpecific gravity with standard volume displacersand standard wall torque tubes:Fluid Level and Fluid-to-Fluid Interface2500 Controllers , except 2503 and 2503R:Specific gravity range, to and 2503R: Specific gravity range, Density2500 Controllers , except 2503 and 2503R:Minimum change in specific gravity, and 2503R: Minimum change in specificgravity, your Emerson Process Managementsales office for information on non-standardapplicationsOutput SignalSee table 1 Output ActionJDirect (increasing fluid or interface level orspecific gravity increases output pressure) orJReverse (increasing fluid or interface level orspecific gravity decreases output pressure)Area Ratio of Relay Diaphragms3:1 Supply Pressure(1)Normal Operation: See table to Prevent Internal Part Rupture(2).

3 3 bar (45 psig)Steady-State Air ConsumptionSee table 4 Proportional Band, Differential Gap, or SpanSee table 1 Set Point ( Controllers Only)Continuously adjustable to position control pointor differential gap of less than 100 percentanywhere within displacer length (fluid or interfacelevel) or displacement force change (density)Zero Adjustment (Transmitters Only)Continuously adjustable to position span of lessthan 100 percent anywhere within displacerlength (fluid or interface level) or displacementforce change (density)PerformanceIndependent Linearity (Transmitters Only):1 percent of output pressure change at span of100 percentHysteresis: percent of output pressurechange at 100 percent of proportional band,differential gap, or spanRepeatability: percent of displacer length ordisplacement force changeDeadband (Except Differential GapControllers(3)): percent of proportional bandor spanTypical Frequency Response: 4 Hz and90-degree phase shift at 100 percent ofproportional band, differential gap, or span withoutput piped to typical instrument bellows meters (20 feet) of mm (1/4-inch) tubingAmbient Temperature Error: percent ofoutput pressure change per 28_C (50_F) oftemperature change at 100 percent ofproportional band, differential gap, or span whenusing sensor with standard wall N05500 torquetubeReset (Proportional-Plus-Reset ControllersOnly): Continuously adjustable from to minutes per repeat (from 200 to under per minute)Anti-Reset Differential Relief (2502F and2502FR Controllers Only): Continuouslyadjustable from to bar (2 to 7 psi)differential to relieve excessive differencebetween proportional and reset pressures-continued- 2500-249 Controllers and TransmittersProduct.

4 2500 May 2011 3 Specifications (Continued)Standard Tubing Connections1/4 NPT internalSensor Connection SizesSee tables 5 and 6 Maximum Working Pressures (Sensors Only)(1)Consistent with applicable ASME pressure/temperature ratings for the specificsensor constructions shown in tables 5 and 6 Operative Ambient Temperatures(1) : 40 to 71_C ( 40 to 160_F)JHigh Temperature: 18 to 104_C (0 to 220_F) table 2 For ambient temperature ranges, guidelines, anduse of optional heat insulator, see figure 5 Standard Supply and Output Pressure GaugeIndicationsSee table 4 Allowable Process Temperatures(1)See table 2 Hazardous Area Classification2500 Controllers comply with the requirements ofATEX Group II Category 2 Gas and DustConstruction MaterialsSee tables 2, 3, and 7 Mounting PositionsSee figure 10 Caged Sensor Connection StylesSee figure 11 OptionsSee Options sectionNOTE: Specialized instrument terms are defined in ANSI/ISA Standard Process Instrument The pressure/temperature limits in this document and any applicable code or standard should not be Also see Supply Pressure Overpressure Protection For 2500S, 2500SC, and 2503 adjusting the differential gap is equivalent to adjusting the Adjustment Set point, proportionalvalve opening, and reset changes are made withsimple dial-knob , Durable Construction Few movingparts are used.

5 Knife-edged driver bearing in sensorand plated brass instrument case ball bearing fortorque tube rotary shaft help provide low-frictionoperation. Sensors are available in ratings up Versatility Caged sensors areavailable in a variety of orientations and connectionstyles, and all sensors can be either right- orleft-hand to Small Changes Displacerreaction to small specific gravity changes allowsthese instruments to be used for density applicationsand in other applications where a response to lowlevels of input signal change is Reversibility Action is field reversiblefrom direct to reverse or vice versa without Maintenance Costs Spring-outwire provides for in-service cleaning of relay orifice(figure 2). Torque tube can be replaced withoutremoving torque tube Operating Costs Supply pressureconservation is enhanced in all constructionsbecause relay exhaust opens only when outputpressure is being Vessel Sizes Required for StableControl Caged 249 sensors come standard with aliquid damping orifice in the lower equalizingconnection that helps stability where vesselcapacitance is small and permits narrowerproportional valve Controllers and TransmittersProduct :2500 May 2011 4 Table 1.

6 Additional Specifications for Selected Fisher 2500 controller ConfigurationsControl or Transmission ModeController(1)Full Output Signal Change Obtainable Over Input Of:Output SignalProportional control2500, 2500C(2)Proportional band of 0 to 100 percent of displacer length ordisplacement force change (10 to 100 percent recommended) to bar(3 to 15 psig) to bar(6 to 30 psig)Proportional-plus-reset control2502, 2502C(2)Proportional band of 0 to 200 percent of displacer length ordisplacement force change (20 to 200 percent recommended)Proportional-plus-reset control withanti-reset windup2502 FDifferentialGap (On-off)ControlWith proportional valveand full differentialgap adjustment2500S, 2500SC(2)Differential gap of 0 to 100 percent of displacer length0 and bar (0 and 20 psig) or0 and bar(0 and 35 psig)Without proportionalvalve has limiteddifferential gapadjustment2503 Differential gap of approximately 25 to 40 percent of displacerlength, when a 356 millimeter (14-inch) ideal-volume displacer isused on specific gravity liquid level service and a bar (20 psig)

7 Supply regulator setting is varied between bar (15 and 25 psig)(3)0 and full supplypressure(4)Proportional transmission2500T, 2500TC(2)Span of 0 to 100 percent of displacer length or displacementforce change (20 to 100 percent recommended) and bar (3 to 15 psig) or to bar (6 to 30 psig)1. The suffix R is added to the type number for reverse action, and all types have a 67 CFR supply regulator mounted as The suffix C is added to the type number for indicator Other displacer lengths and volumes, or service conditions, will result in other differential bar (20 psig) and bar (35 psig) are the standard factory-set supply regulator pressures, but these values will vary whenever the supply pressure is changed to adjust the 2. Allowable Process Temperatures for CommonFisher 249 Sensor Component MaterialsMATERIALPROCESS TEMPERATUREM inimumMaximumCast Iron(1) 29_C ( 20_F)232_C (450_F)Steel 29_C ( 20_F)427_C (800_F)Stainless Steel 198_C ( 325_F)427_C (800_F)N04400 198_C ( 325_F)427_C (800_F)Aluminum 195_C ( 320_F)99_C (210_F)Soft Iron Gasket 29_C ( 20_F)427_C (800_F)GasketsGraphite Laminate/SSTN04400/PTFE 198_C ( 325_F) 73_C ( 100_F)427_C (800_F)204_C (400_F)BoltingB7 steelB7M steelB8M stainless steel 46_C ( 50_F) 29_C ( 20_F) 198_C ( 325_F)427_C (800_F)427_C (800_F)427_C (800_F)1.

8 Cast iron may be used to 73_C ( 100_F) provided a heat insulator is used below 18_C (0_F) and stainless steel studs and nuts are used below 46_C ( 50_F).Table 3. Displacer and Torque Tube MaterialsPartStandard MaterialOther MaterialDisplacer304 Stainless Steel316 Stainless Steel,N10276, N04400,Plastic, and SpecialAlloysDisplacer Stem,Driver Bearing,Displacer Rod andDriver316 Stainless SteelN10276, N04400,other AusteniticStainless Steels, andSpecial AlloysTorque TubeN05500(1)316 Stainless Steel,N06600, N102761. N05500 is not recommended for spring applications above 232_C(450_F). Contact your Emerson Process Management sales office orapplication engineer if temperatures exceeding this limit are Controllers and TransmittersProduct :2500 May 2011 5 Table 4. Supply Pressure DataOUTPUT SIGNALSTANDARD SUPPLY ANDOUTPUT PRESSURE GAUGEINDICATIONS(1)NORMAL OPERATINGSUPPLY PRESSURE(2)AIR CONSUMPTION AT NORMAL OPERATING SUPPLY PRESSURE(3)Normal m3/h(6)Scfh(6)BarPsigMin(4)Max(5)Min(4)M ax(5) to bar (3 to 15 psig),except 0 and bar (0 and 20psig)(2) for on-off controllers0 to 30 to bar (6 to 30 psig),except 0 and bar (0 and 35psig)(2) for on-off controllers0 to 60 Consult your Emerson Process Management sales office about gauges in other Control and stability may be impaired if this pressure is exceeded (except 2503 or 2503R controller without proportional valve).

9 3. Except 2503 or 2503R controller , which bleeds only when relay is open at exhaust At zero or maximum proportional band or span At setting in middle of proportional band or span Normal m3/hr=normal cubic meters per hour at 0_C and bar. Scfh=standard cubic foot per hour at 60_F and OF REVERSE ACTING 2503 RON OFF CONTROLLERDETAIL OF DIRECT ACTING 2502 PROPORTIONAL PLUS RESET CONTROLLERINDICATOR ASSEMBLY DETAILDIRECT ACTING 2500 CONTROLLERRESET ADJUSTMENT3-WAY BOURDON TUBE VALVE HAS LARGEPORTS WHICH GREATLY REDUCE CLOGGINGPIPE PLUG INSTEAD OF PROPORTIONALVALVE MEANS INTERMITTENT BLEEDTHAT MINIMIZES FREEZE UPSPRING-OUTCLEANING WIREPROPORTIONAL BANDADJUSTMENTPOINTERINDICATOR ANDBASE PLATESW5637/ILW0656-1/ILW0648-1/ILW0671- 1/ILFigure 2. Typical Fisher 2500 controller Constructions with Right-Hand Mounting Shown2500-249 Controllers and TransmittersProduct :2500 May 2011 6W0144-1/ILDAMPING ORIFICE(REMOVABLE IF CLOGGING WILL OCCUR)W1800-1/ILW2141-1/ILKNIFE EDGE BEARINGTORQUE TUBEDISPLACER RODROTATABLEHEADDISPLACERCAGEF igure 3.

10 Fisher 249B Caged Sensor (Typicalof all Rotatable-Head Caged Sensors)DISPLACER RODDISPLACER STEM ENDCONNECTOROPTIONALTRAVELSTOP PINAND PLATEDISPLACERSTEMDISPLACERSTUD249BP MOUNTS ON TOPOF VESSELW0660-1/IL249VS MOUNTS ONSIDE OF VESSELSTANDARD TRAVEL STOP ASSEMBLY249W WAFER BODYNPS 3 OR 4RF FLANGESTILLWELL11 NOTE:STILLWELL REQUIRED AROUND DISPLACER IF THE FLUIDIS IN A STATE OF CONTINUOUS AGITATIONW8252 CENTER OF DISPLACERSHOULD BE LOCATIONOF LIQUID OR INTERFACELEVEL DURING NORMALOPERATION249W MOUNTS ON TOP OF VESSEL AS SHOWN ORCAN MOUNT IN CUSTOMER FABRICATED CAGEW9353 Figure 4. Typical Cageless Sensors2500-249 Controllers and TransmittersProduct :2500 May 2011 7 Table 5. Caged Displacer Sensors(1)Torque tubearm rotatablewith respectto equalizingconnectionsSENSOREQUALIZING CONNECTIONPRESSURE RATING(2)StyleSize (NPS)249(3)Screwed1-1/2 or 2CL125 or 250 Flanged2249B or 249BF(4)Screwed or optional socket weld1-1/2 or 2CL600 Raised face or optional ring-type joint flanged1-1/2CL150, 300, or 6002CL150, 300, or 600249C(2)Screwed1-1/2 or 2CL600 Raised face1-1/2CL150, 300, or 6002CL150, 300, or 600249 KRaised face or optional ring-type joint flanged1-1/2 or 2CL1500249 LRing-type joint flanged2(5)CL25001.