Emerson Fisher C1 Data Sheet
Contents
1. Eum Product Bulletin CI Controllers and Transmitters 3431 D103291X012 July 2014 Bourdon Tube Protection Figure 7 Typical Yoke Mounting All Bourdon tube constructions are available with one or both of the following protective devices Barrier Protector for Corrosive or Clogging Process Fluids A sealed and fluid filed barrier described in Fisher product bulletin 39 025 may be installed between the process and the Bourdon tube The barrier fluid transmits sensed pressure on a one to one basis into the Bourdon tube Travel Stop for Bourdon Tube The stop limits Bourdon tube overtravel when momentary surges in the sensed pressure exceed the Bourdon tube rating Although it does not permit accurate control or transmission of a pressure higher than the upper range limit listed in table 2 this stop does permit Bourdon tube overpressuring to the maximum static pressure shown in table 2 without damage Installation ACI controller or transmitter normally comes installed ona final control element or indicating device or equipped for separate surface or pipestand mounting Usually control valve with just a controller or transmitter and one supply regulator has the controllerftransmitter and regulator yoke mounted on opposite sides of the actuator as shown in figure 7 Nipple mounting of the supply regulator if desired is available Specify such mounting if the opposite yoke boss of an actuator will be2. orm 4 to 100 of the sensing element range for 0 4 102 0bar 6 to 30 psig For ProportionaPlus Reset Controllers Full output pressure change adjustable from m 3 to 100 of the Sensing element range for 0 2 to 1 0 bar 3 to 15 psio or m 6 to 100 of the sensing element range for0 4to 2 0 bar 6 to 30 psia Differential Gap Adjustment For Differential Gap Controllers Full output pressure change adjustable from 15 to 100 of sensing element range Reset Adjustment For ProportionaPlus Reset Controllers Adjustable from 0 01 to 74 minutes per repeat 100 to 0 01 repeats per minute Zero Adjustment Transmitters Only Continuously adjustable to position span of less than 100 anywhere within the sensing element range Span Adjustment Transmitters Only Full output pressure change adjustable from 6 to 100 of process sensing element range Performance Repeatabllty 0 5 of sensing element range Dead Band Except Differential Gap Controllers 0 1 of sensing element range Typical Frequency Response at 100 Proportional Band Output to Actuator 0 7 Hz and 110 degree phase shift with 1850 em 113 inches volume actuator at midsstroke Output to Positioner Bellows 9 Hz and 130 degree phase shift with 0 2 to 1 0 bar 3 to 15 psig output to 2 inches bellows CI Controllers and Transmitters D103291X012 Product Bulletin 3431 July 2014 Specifications continued Ambient Operating Temp
3. Reduced Ar Gas Consumption The C1 pneumatic controller is an energy efficient choice helping to Improve profits and uptime Steady state consumption rate ls less than the 6scfh requirement set for the il and gas industry by the US Environmental Protection Agency New Source Performance Standards Subpart 0000 EPA HQ QAR 2010 0505 FISHER CI PNEUMATIC CONTROLLER MOUNTED ON CONTROL VALVE ACTUATOR Sour Service Capability Materials are avalable for applications handling sour process fluids These constructions comply with the metallurgical requirements of NACE MRO175 15015156 amp NACE MRO103 Environmental restrictions may apply Mounting Versatilty insallthe case on a panel wall or pipestand as well as directly on the control valve actuator Reduced Maintenance Costs A spring out cleaning wire shown in figure 4 provides for in service leaning of the relay orifice Proportional Only Proportional Plus Reset and Differential Gap Configurable The C1 controler an be configured to provide various modes of control Features contnuedon page 3 amp EMERSON wher com Process Management Product Bulletin 343 1 july 2014 C1 Controllers and Transmitters 0103291012 Specifications Available Configurations See table 1 Input signal Pressure Type m Gauge pressure vacuum m compound pressure orm differential pressure aliquid or gas Limits See table 2 or 3 Output signal
4. any product esposti for proper section use and maintenance ofany product remains solely wi he purse and end user Fer arr ped by one ol theconpenesin the Emerson Process Management business uf enon Dect Emeron Proces Management Eanan sd ar renal nf soar d eraan cu Co la mats e propery f rapere t The conte of th iban are presented for orans purposes orly and he eor has een mae eee cu they are not eerie quate expense pied egg sees harei or ese psy e EMERSON ina Ctt Mrd Process Management
5. Proportional or Proportional Pus Reset Controles and Transmitters m 0 2to 1 0 bar 3 to 15 pig or 8041020 bar 6 to 30 ps pneumatic pressure Differential Gap Controllers m O and 1 4 bar 20 psig orm O and 2 4 bar 0 and 35 psig pneumatic pressure signal Action Control action i feld reversible between direct increasing sensed pressure produces increasing output signal and m reverse increasing sensed pressure produces decreasing output signal Supply Pressure Requirements See table4 Supply Pressure Medium Aor natural gas Quality Supply pressure must be clean dry air that meets the requirements of ISA Standard 7 0 01 A maximum 40 micrometer particle size inthe alr system is acceptable Further filtration down to 5 micrometer particle sizes recommended Lubricant contentis not to exceed 1 ppm weight w w or Volume uJ bass Condensation in the alr supply Should be minimized Natural Gas Natural gas must be clean dry olHree and noncorrosive HS content should not exceed 20 ppm Steady State Air Consumption 2 3 0280 abarQ to IS pig 0 08 ermal nour 4t0 2 0 bar 6 to 30 psig 0 12 normal m hour 5 Supply and Output Connections 1 4 NPT internal Supply and Output Pressure Gauge Ranges See table 5S Proportional Band Adjustment For Propottional Only Controllers Full output pressure change adjustable from 2 to 100 of the Sensing element range for 0 2 to 1 0 bar 3 to 15 psi
6. C1 Controllers and Transmitters D103291X012 Product Bulletin 1 July 2014 Fisher C1 Pneumatic Controllers and Transmitters Fisher C1 controllers and transmitters continue the tradition of durable and dependable Fisher pressure instrumentation while addressing air gas consumption concems The CI is used wherever durable and dependable pressure instrumentation is required The use of this product in demanding applications such as those found in chemical process gas and oll production industries demonstrates its versatility The ET can reduce steady state alr gas consumption to as itle as 1 10th that of previous products Cl controllers compare sensed process pressure or differential pressure with an operator adjusted set point and send a pneumatic signal to an adjacent Control element that maintains the process pressure at or near the set point value CI transmitters sense process variables and send out a pneumatic signal Usually to an indicating or recording device that directly indicates the process measurement Unless otherwise noted all NACE references are to NACE MRO175 15015156 amp NACE MRO103 Features Wide Range of Sensing Elements A Bourdon tube is avalable for high pressures or bellows for vacuum and low pressures Ether kind of sensing element an be installed in the case with the controller or transmitter Two interchangeable ranges of output bellows and gauges also available
7. e the proportional band adjustment is at ts maximum setting the cantilever spring in the proportional band assembly has a low spring rate allowing more motion to be transferred from the proportional bellows for a change in output pressure As the effective length of the cantilever is reduced its spring rate Increases causing less feedback motion rom popetnalbelows Setting the proportional band knob to its maximum results ln proportional band of 100 The lower the proportional band adjustment the shorter the effective length of the cantilever spring The spring rate of the cantilever pring increases as its length shortens allowing less motion to be transferred from the bellows to the beam and flapper for a given change in output pressure Proportional Plus Reset Controllers Additionally all proportional plus reset C1 controllers have a two way reset restriction valve that channels proportional pressure into a reset bellows to oppose the proportional bellows action The action of this reset pressure occurs on a delayed basis The reset Valve can be adjusted to vary the time of delay Anti Reset Windup Ci controllers with ant eset windup have an adjustable and reversible differential relef valve to provide antireset windup As shown in figure 2 the Proportional pressure registers rapidly on the spring Side of the relief valve diaphragm as well asin proportional bellows Reset pressure registers slowly onthe opposite s
8. en Ito Zar LIU DIDIT Table 6 Construction Materials MEI Hort IES RESTRICT pT ROOT TOR proces LLLI oa ig Wor esi Sete or NACE compa stale tee md to optiona proces pressure E E mm TST PT PTET ETT TEE a STE BRE Tay aap TETER ere ey FFT steel ee aur Te ara S OT EPS EFE RIT ome gripe USES d TY SSMO TT Se ee aS Principle of Operation The pressure connections to the controller depend upon the type of pressure sensing gauge differential Gauge pressure controllers use either a Bourdon tube or bellows as the sensing element Differential pressure controllers use two bellows to sense differential pressure The key to C1 controler operation isthe pressure balanced relay with ts yoked double dlaphragm assembly shown in figure 1 or 2 The relay connected so that supply pressure bleeds through the fixed orifice before escaping through the nozzle The nozzle pressure registers on the large relay diaphragm and loading pressure controller output onthe small relay diaphragm Steady state sensed process pressure holds the Bourdon tube steady in relation to the nozzle This allows pressure to escape between the nozzle and beam flapper assembly at the some rate bleeds through the orifice A change in the process pres
9. erature Limits Standard Construction 40 to 71 C 40 to 160 F High Temperature Construction 18 to 104 C 102207 Anti reset windup differential pressure relief and process pressure gauge options are only available in the standard construction Typical Ambient Temperature Operating Influence Proportional Control ony 13 0 of output span for each 28 C 50 F change in temperature between 40 and 71 C 40 and 160 F fora controller set at 100 proportional band Reset Control only 2 0 of output span for each 28 C 50 F change in temperature between 40 and 71 C 40 and 160 F for a controller set at 100 proportional band Transmitters only 3 0 of output span foreach 28 C 50 F change in temperature between 40 and 71 C 40 and 160 F fora transmitter set at 100 span Housing Designed to NEMA 3 Weatherproof and IEC 529 IPSA Specifications Hazardous Area Classification Complies with the requirements of ATEX Group II Category 2 Gas and Dust Construction Materials See tables 2 3 and 6 Approximate Weight 8 2kg 18 pounds E Table 1 Available Configurations escrow Features continued Feld Reversible Suitch action from direct to reverse or viceversa without additional parts As Hlustrated in figure 3 transfer the reversing block to the opposite side of the flapper invert the proportional band assembly and change the Feedback bellows tubing con
10. es the controller output to switch from full supply pressure to zero pressure or Viceversa The difference between the process pressure when the controller output switches to zero and the process pressure when the controller switches to maximum is the differential gap Adjusting the proportional band adjustment adjusts the width of the adjusting the set point postions the gap within the process pressure range Transmitters Action ofa pneumatic transmitter is similar to that of a proportionalonly controller Since the output pressure ofthe transmitter has no effect on the process pressure transmitter output pressure is a proportional measure of the process pressure The proportional adjustment determines the span of the transmitter and the pressure setting mechanism determines the zero of the transmitter Product Bulletin 343 1 July 2014 1 Controllers and Transmitters 0103291012 Figure 3 Conversion from Reverse to Direct Action or Proportional to Differential Gap DIRECT ACTING DIFFERENTIAL CAP CONTROLLER Construction Features Rugged Service Capability The case and cover are made of weather resistant die cast aluminum Stainless steel tubing and fitting materials provide the capability for operation in ammonia and similar corrosive service conditions Optional materials for relay diaphragms and other soft Barts permit operatio
11. hanges in sensed pressure This is useful when slow reset and broad proportional band settings are used The differential relief valve has a range of 0 14 to 0 4 bar 2 to 7 psia and unless ordered otherwise is set by the factory to relieve at a 0 3 bar 5 psi difference between proportional and reset pressures Manual Backup As shownin figure6 a Fisher 670 or 671 panel mounted loading regulator with changeover valve permits switching to an alterate loading pressure Ct controller experiences supply pressure failure or other malfunction Figure 6 Schematic of Manual Backup Changeover Hookup Continuous Indication of Process Pressure Replacing the supply pressure gauge on a pressure controller or transmitter bya process pressure gauge permits indicating process pressure in one of the Fanges shown in table 7 10 obtain a supply pressure indication installa gauge on the supply regulator The process pressure gauge mustbespecally ordered and Comes with brass trm standard in all ranges and Stainless steel vim optional in some ranges Adding process pressure gauge nthe eld also requies a Special control pressure block A process pressure gauge cannot be added to controllers or transmitters That use a differential bellows for sensing pressure Table 7 Optional Process Pressure Gauges ror oe neee
12. ide of the ele valve diaphragm As long as controller output pressure changes are slow enough for normal proportional and reset action the relief valve spring keeps the relief valve diaphragm from opening However a large or rapid decrease in CI Controllers and Transmitters 0103291012 Product Bulletin 3431 July 2014 Figure 2 Schematic of Reverse Acting Proportional Plus Reset Controller with Ant Reset Windup Domus controller output pressure causes the relay to rapidly exhaust loading pressure from the control element and also from the proportional system and spring side ofthe relief diaphragm If this decrease on the spring side of the diaphragm is greater than the relief valve spring setting the diaphragm will move off the relief valve orifice and permit the reset pressure on the opposite side of the relief valve diaphragm to bleed rapidly into the proportional system The anti reset windup action also can be reversed to relieve with an Increasing proportional pressure Differential Gap Controllers In C1 differential gap controllers feedback pressure does not counteract the change in flapper position Instead the output pressure is piped to the bellows located on the side ofthe beam and flapper opposite The nozzle Feedback pressure now reinforces t flapper movement by the sensed pressure change This construction caus
13. n at ambient temperatures up to 33 C 200 Low Pressure Precision Bellows sensing constructions provide better accuracy In low pressure vacuum or compound ranges Two Sensing bellows are used where an important variable isthe difference between wo sensed pressures Conversion From Proportional To Differential Gap Control The CI controller can be configured to provide diferential gap oof control rather than proportional control The proportional bellows is Connected so that feedback pressure pushes the beam Product Bulletin CI Controllers and Transmitters 34301 D103291X012 July 2014 Figure4 Fisher C1 Constructions Ane Sr and fapperin the same direction as caused bythe leverse Direct Conve Seed essue change Raverse Direct Conversion MM eee mney Switching the action from reverseto dect eee Pressure ri slowing hohes sera done by muing the reversing dnd a monaten tos a dete deter gianna de M ERU ed the tubing connection on the mounting base and Invert the proportional band assembly as shown in figured Product Bulletin 3431 14 2014 1 Controllers and Transmitters 0103291012 Figure S Bellows Details Anti Reset Windup Te antiteset windup capabilty ofl controllers vides quckequalzation of resetar al Pressures Ths pab reduces overshoot andthe Eime required for a system to retum to the pressure Setting after large c
14. nections Easy More Accurate Adjustments Make pressure setpoint proportional band and reset changes with simple dial knob controls that help to assure positive settings Sensitive Response Area ratio of large relay diaphragm to small relay diaphragm permits small nozzle pressure changes to induce much greater output pressure changes Product Bulletin 343 C1 Controllers and Transmitters July 2014 0103291012 Table 2 Bourdon Tube Pressure Ranges and Materials AOSTA WASTES REET Eg WS Opina rne SET mm Tu ur Fis Table 3 Bellows Pressure Ranges and Materials QUEE xc e E NES 21 TRE cL 8 2 E ae 3 2 2 E EES HEE 2 HE S 2 sx d ae bar O to 20psi 28 Table supply Pressure Data ea S TTT c Ta LD or and LATENT oap Lr LEES x w Product Bulletin Controllers and Transmitters 3431 D103291X012 July 2014 Table 5 Supply and Output Pressure Gauge Ranges E Por NR Gauge Sele and 1 Bar Gand 20 P g Output and 2 4 Bar O nd S sg Output TUS ia End Dur Te te pate Z
15. occupied by a positioner Install the controller or transmitter so that the vent points down Figure 8 Illustrates the vent location the location of all case connections dimensions and mounting information Ordering Information Application When ordering specify 1 Type of service such as pressure reduction or pressure relief throttling or differential gap 2 Composition pressure and temperature of measured varlable s 3 Ambient temperature 4 Pressurein process vessel if closed 5 Type number orientation and other applicable descriptions of control or indicating device s Construction Refer to the Specifications and the Construction Features sections Review the description for each specification construction feature and in the referenced tables Specify the desired selection Whenever there isa choice Always specify the complete type number of the C1 controller or transmitter direct or reverse action supply pressure regulator and other desired equipment On controllers with ant reset windup specify whether the differential relief valve is to relieve with falling or rising output Product Bulletin 343 C1 Controllers and Transmitters July 2014 0103291012 Figure 8 Dimensions res Nether meson Emerson Process Management or any of thek entties assumes for the selection use or maintenance
16. sure moves the beam and flapper with respect to the nozzle by ether expanding or contracting the Bourdon tube arc An increasing process pressure with direct action or decreasing Pressure with reverse action produces a ozze flapper restriction that increases the loading on the large relay diaphragm This causes the relay valve to close atthe exhaust end and to open at the inlet end Additional supply pressure flows through the relay chamber to increase the loading pressure on the Product Bulletin 343 July 2014 C1 Controllers and Transmitters 0103291012 Figure 1 Schematic of Reverse Acting Proportiona Only and Proportional Reset Controllers PROPORTIONAL PLUS RESET CONTROLLER sosret Jurstrrussue 3 control valve actuator A decreasing process pressure with direct action or increasing pressure with reverse action produces anozzle flapper opening that bleeds ff pressure on the large relay diaphragm This causes the relay valve inlet to close and the exhaust to open thus exhausting loading pressure from the actuator Proportional Only Controllers The controller output pressure change feeds back to the proportional bellows countering the pressure changein the nozzle and equalizing the relay diaphragm pressure differential The relay valve maintains a new loading pressure according to the dhangein sensed pressur
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