Modulevel Pneumatic Liquid Level Control

Transcription

1 Modulevel Pneumatic Liquid Control Modulevel pneumatic liquid level controls are displacement actuated level sensors that provide output signals in direct proportion to changes in liquid level. Simple modular design and Magnetrol 's proven magnetic coupling make Modulevel controls versatile, highly stable, vibration resistant and adaptable to extremes in temperature and pressure. Features Standard models handle service temperatures from -0 F (-0 C) to +700 F (+7 C) and pressure to 46 PSIG (8 Bar). Stable output signal is unaffected by surface turbulence. Prevents control valve hunting and extends valve life. Controller head may be removed without disturbing pressure boundary. Permits service or replacement without shutdown of process. Simple calibration prior to installation, by substituting weights for displacer or by controller head calibration with displacer. Accurate output signal provided over a wide specific gravity. Controller head rotates 60, simplifies pneumatic piping hookup. Applications 6 SS displacer and trim. Inconel & 6SS springs. Easily calibrated without moving tank liquid level, for reduced installation time and cost. Pilot relay provides a 4 to amplification of pilot pressure signal to speed value response. Built-in visual level indicator is independent of air supply. Optional pneumatic-tocurrent interface transducer for use in electronic control applications. Optional proportional plus integral control. Optional differential gap (on-off) control. Optional High-Low electronic alarm signal provides inexpensive backup alarm. Fabricated construction. Modulevel pneumatic liquid level controls are widely used in utility power generation, chemical and petroleum processing operations, such as: Steam generator feedwater heater regulation Fractionating column level transmitter Ethanolamine level transmitter Vent gas scrubber level control Drip pot condensate level control Flash tank level transmitter Worldwide level and flow solutions SM

2 Principle of operation The key elements of the Modulevel pneumatic control are the magnetic coupling, which allows the controller to be mechanically isolated from the sealed sensing unit; the spring, which dampens the action of the displacer; and the controller head, which provides a modulated pneumatic signal in direct proportion to the input from the vertical motion of the displacer. As the liquid level in the vessel increases or decreases, the buoyant displacer rises or falls. This motion, dampened by the action of the spring to prevent response to the rapid fluctuations of turbulence, is mechanically coupled to an attractor ball, within an enclosed tube. A magnet encircling the tube follows the attractor ball, transferring the motion to a rotating cam, which in turn operates a flapper against a nozzle which increases or decreases the pressure within the pneumatic relay. The output pressure signal can be used in a variety of ways to operate a control valve or signal to alarms, indicators, process controls or other devices. With optional integral control, the pilot nozzle proportional signal is conditioned through an additional metering valve system, which will eliminate offset from the desired control point. Pilot nozzle Flapper Cam Attraction ball Magnet Enclosing tube spring Displacer Control valve Zero adjustment Indicator Actuating lever 0 00 Set point adjustment Feedback bellows Reset valve Relay Chamber OUTPUT Filter Proportional band adjustment SUPPLY Orifice Proportional band spring Reset bellows Check valve Specifications Description Specification Up to 46 PSIG at 00 F Process pressure (Up to 8 Bar at 8 C) Stainless steel cage (with SS bolting) -0 to +700 F (-0 to +7 C) Process temperature Carbon steel cage -0 to +700 F (-9 to +7 C) Specific gravity Minimum: 0. Maximum:.0 Interface detection Process connections Supply pressure* Output Proportional & signal transmitter pressure Differential gap & proportional band adjustment Air consumption Response speed Wetted parts Control action Modes of operation Housing Limit switch ratings Minimum difference of 0.0 specific gravity between liquids NPT, Socket Weld or Flanged 0 PSIG (7 Bar) max. to Instrument quality air (clean and dry) Regulator set to PSIG (. Bar) above maximum output. PSIG, 6 0 PSIG 0 0 PSIG or 0 PSIG Limited only to displacer length. From fractional inches to 0 feet ( meters). SCFH at 9 PSIG output 6 SCFH at PSIG output 00 cu. in. output volume in. sec. upon an output pressure increase from PSIG. Trim: 04 or 6 SS Spring: 6 SS or inconel Chamber: Carbon steel or 6 SS Direct or reverse Proportional control, Differential gap, Transmitter NEMA,,, and R Max. voltage: 0 VAC/VDC Max. resistive load: 0 VAC/VDC Max. current: 4 amp switching amp holding *Maximum supply pressure with customer supplied is 00 PSIG (7 Bar). Supply pressure Output pressure Pilot pressure Reset pressure Options Consult the factory when ordering any of the options listed below. Filter and gauge Modulevel instruments require filtered air of the correct pressure for operation. Filter s may be either field or factory supplied. Filter s and gauges are ordered as separate items using the part numbers listed below: Filter Regulator Gauge Adjustable hangar An adjustable stainless steel suspension cable is available for flanged top-mounting models. Standard length cable is 8 feet (.4 M). A cable is ordered as a separate item using the part number listed below: Adjustable hangar Special process connections Special process connections are available for retrofit applications. Gauge glass tappings Gauge glass tappings are available on all caged models. Specify the location and distance between the tappings when placing an order. P/I converters P/I converters are available on all Modulevel controls. These units can provide a 4-0 ma or 0-0 ma two-wire output signal from the Modulevel transmitter s input air signal of either - PSIG or 6-0 PSIG.

3 Mounting arments Flanged top P, P6 and P6 displacer models For mounting on top of the tank, flanged top models are available. They are used extensively in interface control applications where non-standard size displacers become necessary. An adjustable stainless steel displacer suspension cable is also available. Top mounting models are directly interchangeable with the external cage models. Choose from carbon steel or stainless steel models. A heavy duty model, suitable for pressures up to 46 PSIG at 00 F (8 Bar at 8 C), is also available. External cage P, P, P6, P64, P6, P66, P7, P7, P7 and P74 displacer models External cage models can be easily isolated from the process for maintenance and inspection operations. The modern in-line design eliminates the need for specifying right hand and left hand. Any mounting position is possible by rotating the instrument head. A variety of models are available including sealed or flanged cage with either side/side or side/bottom connections. Choose carbon steel or stainless steel models. Heavy duty models, suitable for pressures up to 46 PSIG at 00 F (8 Bar at 8 C), are also available. Side mounted P68 float model Side mounted models are ideally suited for narrow level applications. Carbon steel models are available with either a P68 Flanged Side Mount Model P6 Flanged Top Model P6 External Cage Model with Side/Side Connections " NPT threaded body or a 4" flanged connection. This model is suitable for pressures up to 800 PSIG at 00 F ( Bar at 8 C). Modulevel pneumatic instruments Modulevel pneumatic instruments are available in a variety of functions and styles to handle different application requirements. Proportional Proportional instruments are used to maintain the level in a tank within a predetermined band. The output from the Modulevel head controls the opening and closing of a valve to control the increase or decrease of the liquid flow through the vessel. Transmitter Transmitters are adjusted for full level operation and signal the current liquid level. The signal can be fed to a variety of devices as the application requires. Transmitter/Receiver controller There are two devices in this version. The first is a transmitter which senses the level directly at the vessel and provides a 00% of span signal to the receiver/controller. The receiver/controller operates in the same manner as a direct connected level device, such as a proportional controller, which allows varying the proportional band and level set point. This unit may be mounted either integrally next to the transmitter, or at a more convenient remote location. Electric limit switches Electric limit switches allow high and low alarms to be added to any of the pneumatic instruments described above. Interface detection Proportional integral Proportional integral instruments (i.e., with reset) operate in the same manner as the proportional with one major difference. The offset between the desired level and the actual process level is eliminated; thus, maintaining the level at a specific point rather than within a band. Differential gap A differential gap instrument provides only two distinct outputs; either, fully opened or fully closed. One distinct output value is obtained when the level exceeds the upper switching point. This output remains constant until the level decreases below the lower switching point. At this time the controller changes to another distinct output value. The new value remains constant until the level again rises above the upper switching point; causing the output value to return to the first output value. The distance between the two switching points is called the differential gap. Direct acting As the level increases, the pressure increases in direct acting pneumatic instruments. Reverse acting As the level increases, the pressure decreases in reverse acting pneumatic instruments. Modulevel controllers can be factory calibrated to detect the interface between two liquids if:. There is a minimum difference in specific gravity of The interface line between the two liquids is kept within the length of the displacer.. The displacer is constantly submerged in liquid. Consult the factory when specifying units for interface applications. The specific gravity of both liquids must be supplied at the time the order is placed.

4 Expedite ship plan (ESP) Many standard Modulevel pneumatic level controls are available for quick shipment, usually within one week after factory receipt of a purchase order, through the Expedite Ship Plan (ESP). Models covered by ESP service are conveniently color coded in the selection data charts which follow. To take advantage of ESP, simply match color coded model number codes and options (standard dimensions apply). ESP service may not apply to orders of ten units or more. Contact your local representative for lead times on larger volue orders as well as other products and options. Selection data Modulevel controls are identified by a ten digit alphanumeric model numbering system. The model number describes model configuration, materials of construction, level s, and other options vital to the performance and function of the instrument. Example: P6-CA-PAA Model number construction 4 Mounting & materials of construction Specific gravity and temperature Tank connection - - Standard flanged cage displacer models Tank connection Mounting and materials of construction Model Style Mounting Arment Body ➁ Material Pressure P6 Carbon Steel In Tank Top ➀ P6 6SS ANSI P6 Side/Bottom Carbon Steel 0, P64 External 6 SS 00, Flanged P6 Cage Carbon Steel 600 lb. Side/Side P66 6 SS ➀ Requires adjustable hangar, part number , when the span is greater than.00" (7 mm) below the mounting flange. ➁ Head flange bolting is alloy steel regardless of body material. Specific gravity and temperature Liquid Specific Code Gravity 400 F (04 C) Max. 700 F (7 C) Max ➂ Inconel spring furnished on models P6, P64, and P66 with codes 4,, and 6. Mounting Connection Code Model Pipe Size ANSI Head Flange Rating 0 lb. 00 lb. 600 lb. inch G G4 G P6, P6 4 inch H H4 H 6 inch K K4 K Model Pipe Connection Mounting Connection Code ANSI Head Flange Rating Size Style 0 lb. 00 lb. 600 lb. NPT C C7 C9 " Socket Weld C6 C8 C0 P6, P64, Flanged P P4 P P6, P66 NPT D D7 D9 " Socket Weld D6 D8 D0 Flanged Q Q4 Q 4 /displacer diameter Code A B C D E F G H I Inches mm Dia mm Transmitter/Receiver Controllers Single Function Models Integral Mount Remote Mount Function Pressure PSIG Direct Acting Reverse Acting Direct Reverse Direct Reverse Standard w/limit Standard w/limit Acting Acting Acting Acting Head Switches Head Switches Standard Standard Standard Standard Proportional - PAA PIA PEA PMA RAA REA TAA TEA 6-0 PAB PIB PEB PMB RAB REB TAB TEB Proportional - PBA PJA PFA PNA RBA RFA TBA TFA w/reset 6-0 PBB PJB PFB PNB RBB RFB TBB TFB Transmitter - PCA PKA PGA POA 6-0 PCB PKB PGB POB Differential 0-0 PDA PLA PHA PPA gap 0- PDB PLB PHB PPB For explanations of the various types of pneumatic instruments, refer to page.

5 Selection data Model number construction Modulevel controls are identified by a ten-digit alphanumeric model numbering system. The model number describes model configuration, materials of construction, level s and other options vital to the performance and function of the instrument. Mounting & materials of construction - - Example: P-H6A-PAA Specific gravity and temperature Tank connection 4 High pressure flanged cage displacer models Tank connection Mounting and materials of construction Model ➀ Style Mounting Arment Body Material Pressure P In Tank Top ➁ ANSI Carbon P External Side/Bottom Steel 900, 00, P Flanged Cage Side/Side 00 lb. ➂ ➀ P0 Series displacer material 04 stainless steel. ➁ Requires adjustable hangar, part number , when the span is greater than 9." (6 mm) below the mounting flange. Mounting Connection Code Model Pipe Size ANSI Head Flange Rating 900 lb. 00 lb. 00 lb.➂ P 4 inch H6 H7 H8 Mounting Connection Code Model Pipe Connection ANSI Head Flange Rating Size Style 900 lb. 00 lb. 00 lb.➂ NPT L L7 L9 " Socket Weld M M7 M9 P, Flanged P6 P7 P8 P NPT L6 L8 L0 Specific gravity and temperature Liquid Specific Code Gravity 700 F (7 C) Maximum " Socket Weld M6 M8 M0 Flanged Q6 Q7 Q8 ➂ Maximum rating for a unit with 00 lb. flanges is 46 PSIG at 00 F (94 Bar at 8 C). 4 /displacer diameter Code A B C D Inches mm Dia mm 48 Transmitter/Receiver Controllers Single Function Models Integral Mount Remote Mount Function Pressure PSIG Direct Acting Reverse Acting Direct Reverse Direct Reverse Standard w/limit Standard w/limit Acting Acting Acting Acting Head Switches Head Switches Standard Standard Standard Standard Proportional - PAA PIA PEA PMA RAA REA TAA TEA 6-0 PAB PIB PEB PMB RAB REB TAB TEB Proportional - PBA PJA PFA PNA RBA RFA TBA TFA w/reset 6-0 PBB PJB PFB PNB RBB RFB TBB TFB Transmitter - PCA PKA PGA POA 6-0 PCB PKB PGB POB Differential 0-0 PDA PLA PHA PPA gap 0- PDB PLB PHB PPB For explanations of the various types of pneumatic instruments, refer to page.

6 Selection data Model number construction Modulevel controls are identified by a ten digit alphanumeric model numbering system. The model number describes model configuration, materials of construction, level s and other options vital to the performance and function of the instrument. Example: P7-C9A-PAA Mounting & materials of construction Specific gravity and temperature - - Standard sealed cage displacer models Tank connection Mounting and materials of construction Mounting Body Model Style Arment Material Pressure 4 P7 Side/Bottom Carbon P7 External Side/Side Steel Sealed P7 Cage Side/Bottom 6SS P74 Side/Side *For 600 lb. pressure rating, refer to chart at right. Specific gravity and temperature Liquid Specific Code ➀ ANSI 0, 00 (*600 lb.) Gravity 400 F (04 C) Max. 700 F (7 C) Max ➀ Inconel spring furnished on all models except P7 and P74 with specific gravity and temperature codes, and which use a stainless steel spring. Tank connection Mounting Connection Code ANSI Mounting Model Pipe NPT Socket Flange Rating Size Weld 0 lb. 00 lb. 600 lb. P7, P7, " C9 C0 P P4 P P7, P74 " D9 D0 Q Q4 Q 4 /displacer diameter Code A B C D E F G H I Inches mm Dia mm NPT, socket weld, and 600 lb. pressure/temperature ratings Temperature ➁ Pressure F C PSIG Bar ➁ Stainless steel models P7 and P74, with specific gravity and temperature codes, and, are limited to a maximum temperature of 400 F (04 C). 6 Transmitter/Receiver Controllers Single Function Models Integral Mount Remote Mount Function Pressure PSIG Direct Acting Reverse Acting Direct Reverse Direct Reverse Standard w/limit Standard w/limit Acting Acting Acting Acting Head Switches Head Switches Standard Standard Standard Standard Proportional - PAA PIA PEA PMA RAA REA TAA TEA 6-0 PAB PIB PEB PMB RAB REB TAB TEB Proportional - PBA PJA PFA PNA RBA RFA TBA TFA w/reset 6-0 PBB PJB PFB PNB RBB RFB TBB TFB Transmitter - PCA PKA PGA POA 6-0 PCB PKB PGB POB Differential 0-0 PDA PLA PHA PPA gap 0- PDB PLB PHB PPB For explanations of the various types of pneumatic instruments, refer to page.

7 Selection data Model number construction Modulevel controls are identified by a ten-digit alphanumeric model numbering system. The model number describes model configuration, materials of construction, level s and other options vital to the performance and function of the instrument. Example: P68-FA-PAJ Mounting & materials of construction Specific gravity and temperature - - Tank connection & level 4 Standard side mounted float models Mounting and materials of construction Specific gravity and temperature Model Style P68* In-Tank Side Mounting Body Float Arment Material & Trim Carbon Steel Pressure ANSI 6 SS 0, 00, 600 Lb. Liquid Specific Code Gravity 400 F (04 C) Max minimum *Maximum pressure rating with 600 lb. flange is 800 psi at 00 F. Model P68 Tank connection and level Pipe Size NPT Mounting Connection Code ANSI Mounting Flange Rating 0 Lb. 00 Lb. 600 Lb. Inch FA Not Available 4 Inch N/A HA H4A HA Maximum available level is 8.0" (6 mm) with " NPT and 7.8" (87 mm) with flanged models. 4 Single Function P68 Models Only Function Pressure Integral Mount PSIG Direct Acting Reverse Acting Proportional Standard Standard - PAJ PEJ 6-0 PAK PEK Proportional - PBJ PFJ w/reset 6-0 PBK PFK Transmitter - PCJ PGJ 6-0 PCK PGK Differential 0-0 PDJ PHJ Gap 0- PDK PHK For explanations of the various types of pneumatic instruments, refer to page. 7

8 Dimensional specifications inches (mm) High pressure flanged cage models: P6, P6, P6, P64, P6, P66 NOTE: Controller head may be rotated through (48) (9) 9.77 (48) (6) /4" NPT x.00 () long minimum nipple required (4) /4" NPT 8.7 (47) (9) 4. (6) /4" NPT x.00 () long (6) (4) /4" NPT.00 (7) ANSI standard flange.00 (7) C.00 () A B Mid.6 (6) +.00 () Dia. P6 and P6 Series Top Mounting 0, 00, 600 lb. Class 8.6 (9). (8) Optional /4" NPT gauge glass tapping () /" or " NPT or socket weld () /" or " ANSI standard flange Vent /4" NPT output Outlet Size 8.8 () Swing radius 6.7 (7).06 (6).00 () /4" NPT supply Controller Head (side view) Dimension A " NPT or Socket Weld. (8) " NPT or Socket Weld.4 (8) Outlet Size Dimension B " Flanged.94 () " Flanged 6. (9) Outlet Size Dimension C " or ", 0 lb. 7.0 (9) " or ", 00 lb. 8. (0) " or ", 600 lb. 8. (0) ➀ Add.96 (0) for units with specific gravity code,.08 (9) for units with specific gravity code 4, and. (79) for units with specific gravity codes or 6. ➁ Distance without stem extension is.00 (7) standard. Can be furnished to a minimum distance of.00 (76). P6 and P64 Series with Side/Bottom Connections 0, 00, 600 lb. Class 8.7 (47).00 (7) () /" or " ANSI standard flange.00 (76) () /" or " NPT or socket weld (9) B A C Mid 4.77 (7) /4" NPT x.00 () long (6).00 ().6 (6) +.00 () (4) /4" NPT () Optional /4" NPT gauge glass tapping " NPT P6 and P66 Series with Side/Side Connections 0, 00, 600 lb. Class 8

9 Dimensional specifications inches (mm) High pressure flanged cage models: P, P, P NOTE: Controller head may be rotated through 60. B (9) A /4" NPT x.00 () long (6) (4) /4" NPT E F (9) K /4" NPT x.00 () long.00 () (6) D (4) /4" NPT C Dia. ANSI standard flange P Series with Top Mounting 900, 00, 00 lb. Class (9) /4" NPT x.00 () long mounted Filter (6) H M L G Mid.7 Max. (9) +.00 () () Optional /4" NPT gauge glass tapping () /" or " NPT or socket weld () /" or " ANSI standard flange (Refer chart for class and size.) P Series with Upper Side/Bottom Connections 900, 00, 00 lb. Class E F K D.00 () (4) /4" NPT 8.8 () Swing radius 6.7 (7) /4" NPT supply () /" or " ANSI standard flange (Refer to chart for class and size.) P Series with Side/Side Connections 900, 00, 00 lb. Class Outlet Size " NPT or Socket Weld " NPT or Socket Weld J () /" or " NPT or socket weld G L Mid Dimensions L.7 Max. (9) M (0) (87) () (89) +.00 () () Optional /4" NPT gauge glass tapping Flange Size Dimensions & Class A B C D E F G H J K " 900 lb. " 900 lb. " 00 lb. " 00 lb. " 00 lb. " 00 lb. Vent /4" NPT output Controller Head Side View.06 (6).00 () (84) (4).44.0 () () (6) (46) (6) (6) (87) (9) (08) (8) (0) ().44. () () (6) (466) (66) (6) (87) () () (7) (0) (67) (47) (47) (6) (488) (88) (6) (87) (6) () (8) 9

10 Dimensional specifications inches (mm) Standard sealed cage models: P7, P7, P7, P74 NOTE: Controller head may be rotated through 60. (9) /4" NPT x.00 () long (9) /4" NPT x.00 () long (6) (6) 0.69 () 6.7 (4).00 () (4) /4" NPT 0.69 () 6.7 (4).00 () (4) /4" NPT 8.6 (9). (8) C D Mid.6 (6) +.00 () () Optional /4" NPT gauge glass tapping () /" or " NPT or socket weld () /" or " ANSI standard flange () /" or " ANSI standard flange.00 (76) () /" or " NPT or socket weld C D Mid.6 (6) +.00 () () Optional /4" NPT gauge glass tapping " NPT P7 and P7 Series with Upper Side/Bottom Connections 0, 00, 600 lb. Class P7 and P74 Series with Side/Side Connections 0, 00, 600 lb. Class Vent /4" NPT output 8.8 () Swing radius 6.7 (7).06 (6).00 () Controller Head Side View /4" NPT supply Outlet Size " NPT or Socket Weld " NPT or Socket Weld " Flange " Flange Outlet Size Dimension C. (8).4 (8) Dimension D.94 () 6. (9) ➀ Add.96 (0) for units with specific gravity code,.08 (9) for units with specific gravity code 4, and. (79) for units with specific gravity codes or 6. 0

11 Dimensional specifications inches (mm) Standard side mount models: P68 NOTE: Controller head may be rotated through 60. (9).0 (89) Diameter 6. () /4" NPT x.00 () long (6) (4) /4" NPT Vent /4" NPT Output 0.00 (4) " NPT.6 (6).00 ().9 (0) /4" NPT Supply Maximum length to inside of tank.8 (60) (60) Maximum 8.0 level (6) change.00" (76) Diameter float P68 Series with Threaded Side Mounting (9) /4" NPT x.00 () long /4" NPT Supply (6) (4) /4" NPT Vent /4" NPT Output 0.0 (68) (6) Maximum length to inside of tank (87) Maximum level change.6 (6).00 () A B.00" (76) Diameter float P68 Series with Flanged Side Mounting Vent /4" NPT output 8.8 () Swing radius 6.7 (7).06 (6).00 () /4" NPT supply Flange Size Dim. Dim. No. of Dia. of and Class A B Bolt Bolt Holes Holes 4" 0 lb (7) () 8 (9) 4" 00 lb (7) () 8 () 4" 600 lb (49) (498) 8 () Controller Head Side View

12 Product warranty All Magnetrol mechanical level and flow controls are warranted free of defects in materials or workmanship for five full years from the date of original factory shipment. If returned within the warranty period; and, upon factory inspection of the control, the cause of the claim is determined to be covered under the warranty; then, Magnetrol will repair or replace the control at no cost to the purchaser (or owner) other than transportation. Magnetrol shall not be liable for misapplication, labor claims, direct or consequential damage or expense arising from the installation or use of equipment. There are no other warranties expressed or implied, except special written warranties covering some Magnetrol products. Quality assurance The quality assurance system in place at Magnetrol guarantees the highest level of quality throughout the company. Magnetrol is committed to providing full customer satisfaction both in quality products and quality service. Magnetrol's quality assurance system is registered to ISO 900 affirming its commitment to known international quality standards providing the strongest assurance of product/service quality available. ASSURED QUALITY & SERVICE COST LESS 00 Belmont Road Downers Grove, Illinois Fax Dorman Road Mississauga, Ontario L4V-H Fax Heikensstraat 6 B 940 Zele, Belgium Fax Regent Business Ctr., Jubilee Rd. Burgess Hill, Sussex RH 9TL U.K Fax Magnetrol International, Incorporated. All rights reserved. Printed in the USA. Magnetrol and Magnetrol logotype are registered trademarks of Magnetrol International. Performance specifications are effective with date of issue and are subject to change without notice. The brand and product names contained within this document are trademarks or registered trademarks of their respective holders. BULLETIN: EFFECTIVE: January 00 SUPERSEDES: August 999