USER`S MANUAL for Models LM, HM, LC and HC
Contents
1. page 18 Electrical Connector Assembly page 19 SECTION 1 INTRODUCTION General Description The Porter Instrument Mass Flowmeter and Flow Controller are accurate devices for measuring and or controlling liquid flows The flowmeters and flow controllers can handle flows to 0 1000 grams hour water When supplying a flow controller the control valve is welded to the flowmeter Principle of Operation The Porter Instrument Mass Flowmeter and Flow Controller for Liquids include a 316 L SS through flow sensing tube The sensing tube has an inner diameter I D of approximately 039 and contains no flow obstructions Above the center of the sensing tube is a patented heater sensor design The sensor measures the temperature differential across upstream and downstream legs of the sensing tube by means of a thermopile The resulting electrical signal is an accurate measurement of mass flow Flow Controller Flow control is achieved by coupling a control valve to the flowmeter As previously mentioned the control valve is welded to the flowmeter A purge connection is included on the top of the valve stem The electronic control circuitry is incorporated on the printed circuit PC board assembly contained in the flowmeter Control Valve The standard control valve is a normally closed solenoid valve A magnetic field created by the coil assembly lifts the internal valve assembly off the orifice2. 1 7 c id where Cy heat capacity of the calibration liquid Cp heat capacity of the process fluid thermal conductivity of the calibration liquid j thermal conductivity of the process fluid For application of this formula please consult Porter Instrument Miodel Number and Description To order specify E Complete Model Number see below B Liquid Type Include Density Heat Capacity Thermal Conductivity Viscosity and Boiling Point E Maximum Flow Rate Bl Upstream and Downstream Pressure Bl Operating Temperature LM A 05 2 X Q Elastomers 0 None Flowmeters 2 Kalrez Flow Controllers amp Control Valve Base Model Max Flow LM Flowmeter 100 grams hour HM Flowmeter 1000 grams hour LC Flow Controller 100 grams hour HC Flow Controller 1000 grams hour LV Control Valve 1000 grams hour Valve Style Normally Closed Flow Controllers amp Control Valve Electrically Coupled Stand Alone Control Valve Models HM LM amp LV only No Valve Flowmeters Model Revision Factory Specified Output 00 None Model LV only Fitting Size and Type 1 8 Compression 05 0 5 Vd o 42 4 20 D ce 7 add 1 8 Male Metal Gasket Face Seal B 1 4 Compression Models HM HC amp LV only 1 4 Male Metal Gasket Face Seal SECTION 2 INSTALLATION Receipt of Equipment Carefully check the
3. H isver 12 EE 15 Vdc power input MM um ee c Hu c Shield ground D The shield is connected inside the connector to ground ov 15V 15V Power supply connector housing CURRENT MODE Eight 8 pin female DIN Connector Setpoint input Lal Valve common Valve test point BE 15 Vdc power input 7 Circuit common Power supply Shield ground The shield is connected inside the connector to ground connector housing 4 20 mA needs 1 5 Vdc setpoint 17 APPENDIX 2 HOOK UP DIAGRAMS Electrical Connector Interconnecting Cable Assembly 2 4 KRE 6 7 8 i solder side Eight 8 pin female connector Eight 8 pin male DIN Amphenol P N 0913150082002 mating connector Eight 8 pin female DIN Amphenol P N C09131D0082002 FDE 15 pin male D connector of connector Connector 11 No Connection brown XH Flow signal output red 5 Is Setpoint input ellow 2 4 t Valve common Heater common green Is Valve test point blue tet 15 Vdc power input violet 9 I7 15 Vdc power input 7 Connector The shield is connected inside Housing the connector to ground Note Pins 10 15 not used 2 5 4 ce L solder side Eight 8 pin female of connector ant 8 pin 1e DIN Connector 5 Vdc
4. INC RH ngtp B BH Note Dimensions stated in millimeters mm Dimensions subject to change without notice 15 APPENDIX 2 HOOKUP DIAGRAMS Miodels LM and FIM Flowmeters VOLTAGE MODE Eight 8 pin male Eight 8 pin female DIN Connector DIN Connector Valve test point EN EL Te 15 Vdc power input 15V 415 power input 15V 7 Circuit common Power supply Shield ground connector The shield is connected inside housing the connector to ground Model LM HM CURRENT MODE Eight 8 pin male Eight 8 pin female DIN Connector DIN Connector 5 reference voltage output onsen ow signal output j 127 Valve Heatefcommed 1 peswemmemen 0 o oreutcommon MZ The shield is connected inside Yj Model LMHM 2 connector pl housing the connector to ground 15V 15V _ Power supply 16 APPENDIX 2 HOOK UP DIAGRAMS Miodels LC and HC Flow Controllers Eight 8 pin male DIN Connector N 7 X SS Eight 8 pin male DIN Connector 2 Model LC HC FY CLL VOLTAGE MODE Eight 8 pin female DIN Connector 5 reference voltage output ERE SNR ERN e a Valve common Headrcommin M ES ppg rg o f
5. CO INC SHALL CONSTITUTE A WARRANTY BY PORTER INSTRUMENT INC PORTER INSTRUMENT CO INC ASSUMES NO LIABILITY FOR USE OF THIS EQUIPMENT Porter Instrument Co Inc warrants this equipment to be free from defects in workmanship and materials when used in accordance with applicable specifications and with appropriate maintenance for one 1 year from date of delivery to the customer unless otherwise specified in writing Equipment which malfunctions may be returned shipment prepaid to Porter Instrument Co Inc for test and evaluation Equipment determined to be defective and in warranty will be repaired or replaced at no charge to the customer Equipment out of warranty will be evaluated and if the equipment does not meet original specifications and calibration the customer will be notified of the costs before proceeding with repair or replacement Repaired equipment will be warranted ninety 90 days from date of delivery to customer or for the balance of the original warranty whichever is longer Failures due to shipping damage accident misuse improper mechanical or electrical installation or operation or internal clogging or corrosion due to use of contaminated fluids or inadequate system purging are excluded from warranty coverage Porter Instrument Co Inc s obligation for breach of this warranty or for negligence or otherwise shall be strictly and exclusively limited to the repair or replacement of the equipment Th
6. cR Cuna Ue bu ARE dod quc page 6 Start p sedes Ret denis tcs endet page 6 Operating Conditions page 6 Section 4 Maintenance aad eddie eed page 7 Flowmeter teen page 7 Flow Controller i elisa Rte Rer en page 7 Control Valve 222 easa d eee page 7 Restriction for page 8 Calibration oct mer RYAN ed page 8 PC Board Eayout op ote aang dt ee PUR page 8 Section 5 Troubleshooting General dn teo hates EE eSI page 9 Troubleshooting ea page 9 Section 6 Safety Information for the Return of Mass Flowmeters Mass Flow Controllers 11 page 11 Declaration of Contamination page 11 Return Shipment 0 00 E page 11 Section 7 Certificate of Warranty Certificate page 12 Appendix 1 Dimensional Drawings Model LM page 13 Model HM page 14 Models LC and HC Flow Controllers page 15 Appendix 2 Hook up Diagrams Models LM and HM Flowmeters page 16 Models LC and HC Flow Controllers page 17 Electrical page 18 Interconnecting Cable Assembly
7. it is recommended to install an in line filter upstream of the unit If reverse flow is possible a downstream check valve is also recommended Process Connections The Porter Instrument Liquid Mass Flowmeters and Flow Controllers are available with 1 8 compression fittings 1 4 compression fittings Models HM HC and LV only 1 8 male metal gasket face seal fittings or 1 4 male metal gasket face seal fittings For leak tight installation of units with compression fittings ensure no particulates are present on the process tubing fittings or ferrules Insert the tube to the shoulder of the fitting body Tighten the nut finger tight and while holding the unit wrench tighten the nut sufficiently to prevent leakage For face seal fittings exercise caution so as not to damage the face seal sealing surfaces Whether using compression or face seal fittings refer to the applicable fitting manufacturer s data for specific recommendations regarding installation and tightening Electrical Connections Porter Instrument recommends using interconnecting cables assembled at the factory These cables contain the required electrical connectors allowing hook up between the flowmeter or flow controller and the secondary electronics Where high levels of EMI and or RFI are present contact Porter Instrument Supply Pressure Do not apply pressure until electrical connections are made When applying pressure to the system increase pressure gradually
8. purging the system with an inert gas introduce the process fluid to the unit refer to Section 2 System Purging After the warm up and stabilization period and with no flow through the unit check the output signal The output signal should be approximately 0 2 Zeroing All flowmeters and flow controllers are factory calibrated to the customer s application The following procedure is for readjustment only After the unit has warmed up and stabilized and with no liquid flow the output signal should read approximately 0 2 For flow controllers the output should be checked with a setpoint of zero The electronic circuitry contains a threshold to prevent negative zero drift When an adjustment is required confirm the offset to be positive and adjust the zero potentiometer marked 1 to give an output signal of approximately 0 2 010 Vdc or 4 03 mAdc depending upon output signal type Start up Confirm the piping is clean the fluid is adequately filtered and the system has been leak tested and purged with an inert gas Introduce liquid flow and adjust the set point to approximately 10 Avoid pressure surges and gradually bring the unit up to its operating conditions Prevent pulsating and reverse flow Operating Conditions Each unit has been calibrated and adjusted for the customer s application When using a flow controller in a system with varying pressures valve control could fluctuate due to the valve s orifice
9. reference voltage output Flow signal output Setpoint input Valve common Heater common Valve test point 15 Vdc power input 15 power input BEBE Circuit common hield gr E Connector Housing The shield is connected inside the connector to ground 18 brown red ellow green blue violet orange black shield Note Cable color codes are for reference only and are subject to change without notice APPENDIX 2 HOOK UP DIAGRAMS Electrical Connector Assembly Eight 8 pin female DIN connector Amphenol P N C09131D0082002 Go QJ CE va Transparent tubing Shield of cable should be connected to the connector housing here Cover solder contacts with shrink tubing Eight 8 conductor shielded 24 gauge 10 amp 25 foot cable lengths or 22 gauge 50 foot cable lengths 2 5 4 1 6 8 SOLDER SIDE OF CONNECTOR 19 PO RTER INSTRUMENT COMPANY INC 245 TOWNSHIP LINE RD BOX 907 HATFIELD PA 19440 0907 USA 215 723 4000 FAX 215 723 2199
10. shipping container for damage incurred during shipment Should the container be damaged notify the carrier immediately Also report the damage to Porter Instrument Remove the packing list Carefully unpack the equipment and inspect the contents against the packing list and for any damaged or missing parts The original shipping container in which your Mass Flowmeter Mass Flow Controller was received should not be discarded in case reshipment is necessary Return Shipment Before returning your flowmeter or flow controller to the factory contact Porter Instrument s Customer Service Department for a return authorization RA number Include with the returned equipment 1 A cover letter detailing the requested repair 2 A completed Declaration of Contamination form To safeguard the repair personnel notify Porter Instrument if toxic and or dangerous fluids have been used with the returned equipment This enables Porter Instrument to take sufficient precautionary measures Also the equipment must be cleaned of the toxic and or dangerous fluids Properly pack the equipment using the original shipping container whenever possible Service If the flowmeter or flow controller is not properly serviced serious personal injury and or damage to the equipment could result It is important that servicing be performed by trained and qualified service personnel Mounting The Mass Flowmeter and Flow Controller for Liquids are attitude i
11. to avoid pressure surges The maximum allowable operating pressure for both the mass flowmeter and mass flow controller is 1500 PSIG System Purging In systems handling corrosive or reactive fluids purging with an inert gas is strongly recommended When piping is exposed to air the introduction of a corrosive or reactive fluid could cause a chemical reaction causing the piping and or the flowmeter flow controller to clog or corrode Purging is also strongly recommended to remove such fluids before shutting the system down The flowmeter has no internal seals while the flow controller has Kalrez elastomers in the control valve Each application should be evaluated by the user to ensure material compatibility with the process fluid SECTION OPERATION General The Porter Instrument Mass Flowmeter and Flow Controller for Liquids are designed to measure and or control low flow liquid applications The PC board housed in the flowmeter contains the control electronics required to drive the control valve If at a later stage a control valve is required it may be added to the existing flowmeter Both the flowmeter and flow controller are powered with 15 Vdc Power and Warm up Before introducing power confirm the unit is connected in accordance with the hook up diagram in the Appendix Check the plumbing connections for leak tightness Introduce power and allow a thirty 30 minute warm up and stabilization period After
12. Contamination form be completed and included with the Mass Flowmeter Mass Flow Controller when returned Also suggested is the inclusion of a Material Safety Data Sheet MSDS for the process fluid in question Declaration of Contamination It is imperative the repair personnel prior to initiating the repair recalibration work be informed regarding the condition of the returned unit and on what process fluid the unit was used The Declaration of Contamination form serves this purpose A Completed Declaration of Contamination form must accompany the returned unit otherwise no repair recalibration work will be performed Return Shipment Before returning your Mass Flowmeter Mass Flow Controller to the factory contact Porter Instrument s Customer Service Department for a return authorization RA number In addition to the completed Declaration of Contamination form include a cover letter detail ing the requested repair This enables Porter Instrument to take sufficient precautionary measures while expeditiously repairing recalibrating the returned unit Properly pack the Mass Flowmeter Mass Flow Controller using the original shipping container whenever possible 11 SECTION 7 CERTIFICATE OF WARRANTY THIS WARRANTY IS GIVEN IN PLACE OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE NO PROMISE OR STATEMENT MADE BY ANY REPRESENTATIVE OR AUTHORIZED DEALER OF PORTER INSTRUMENT
13. PORTER MASS FLOWMETERS AND FLOW CONTROLLERS FOR LIQUIDS Na ey sym USER S MANUAL for Models LM HM LC and HC FM 653 Rev B 8 02 Quick Start Installation Instructions Note The instructions below contain procedures for the installation and start up of your Porter Instrument Mass Flowmeter and Flow Controller for Liquids Yt is recommended these instructions and the entire User s Manual be read and understood before performing any operation Failure to do so could result in serious injury and or damage to the equipment The original shipping container in which your Mass Flowmeter Mass Flow Controller was received should not be discarded in case reshipment is necessary Before installing your Mass Flowmeter Flow Controller please confirm the following B Flow rate E Process fluid Upstream and downstream operating pressures Output signal Confirm your operating conditions are within the design parameters of the flowmeter flow controller E Ensure the piping system is clean Install upstream filtration to deliver particulate free liquid to the flowmeter flow controller W install the flowmeter flow controller in line Tighten the process connections i e fittings in accordance with the instructions of the fitting manufacturer B Apply power to the flowmeter flow controller and allow a thirty 30 minute warm up and stabilization period This may be done with or without liquid flow Warning Acc
14. SECTION 4 MAINTENANCE General No routine maintenance is required When cleaning is necessary purge the system with an inert gas refer to Section 2 System Purging and remove the unit from the system Flush the unit in both directions for five 5 minutes with a solvent If cleaning a flow controller confirm the solvent is compatible with the internal Kalrez elastomers Thoroughly dry the unit with a clean dry inert gas For maintenance instructions refer to the flowmeter and control valve sections which follow Flowmeter The Liquid Mass Flowmeter is essentially a through flow 316 L SS sensing tube having no obstructions in the flow path There are no parts to be cleaned separately Flow Controller The Liquid Mass Flow Controller can be supplied either as a flowmeter with an inte gral control valve or as a separate flowmeter and control valve In both cases the con trol circuitry is included on the PC board in the flowmeter Control Valve The control valve may be field disassembled by the user for cleaning and servicing The valve components may be cleaned with a solvent or be ultrasonically cleaned To disassemble the control valve proceed as follows 1 Disconnect the electrical connector from the unit Unscrew the valve stem nut Lift the valve assembly carefully up from the base Unscrew the set screw for the orifice Remove the orifice and orifice holder Remove the plunger assembly ON JUR C
15. allowing flow to pass The orifice is a removable component Electronics The housing of the flowmeter is protected for radio frequency interference RFI and electromagnetic interference EMI The circuitry on the PC board has roll off capacitors for additional RFI and EMI suppression Where high levels of RFI and or EMI are present shielded cables with twisted pairs are recommended The PC board assemblies are manufactured with surface mount devices SMD External connection to the PC board is made using an eight 8 pin DIN connector A 15 Vdc power supply is required for both the flowmeter and flow controller One of the following output signals is available 0 5 Vdc with 2K ohm minimum load 4 20 mAdc non floating ground referenced The output signal type must be specified at time of order placement Liquid Conversion Factors The general formula for determining the relationship between the output signal and the mass flow rate reads Visa Cp m 1 eC 4 where Vignal Output signal k calibration constant Cs heat capacity at constant pressure of the fluid Om mass flow b meter constant A thermal conductivity of the fluid c meter constant A conversion factor must be used if the flowmeter or flow controller is not used on the liquid for which it was calibrated The formula for determining the conversion factor is as follows Omi Cf o Qm where d Cp I b X c
16. device Proceed as follows 1 A N 6 Note Wh Apply power to the system and allow approximately 60 minutes for warm up and stabilization Introduce liquid flow and check system operation Remove the flowmeter s cover to gain access to the PC board potentiometers Connect the DVM ammeter to the output signal Step Set Liquid Flow Adjust Flow Signal Output of full scale Trimpot 0 5 Vdc 4 20 mAdc A 0 L 0 010 4 03 B 100 H 5 000 20 C 50 M 2 500 12 This adjustment must be done at a no flow condition Repeat steps 5A 5C until the deviation between the adjusted and desired values is less than 0 5 of the full scale value ile repeating steps 5 6 be advised E Potentiometers and M can be adjusted without shifting the setting of potentiometer L E Adjusting potentiometer L results in a corresponding shift in the setting of potentiometers and E Potentiometer can be adjusted without shifting the setting of potentiometers ap and PC Board Layout PI P2 p5 P7 Controls the output differentiating network This of the output signal Factory adjusted P8 Controls the derivative action of the control circuit Fact Factory adjusted determines the dynamic response characteristic ory adjusted SECTION 5 TROUBLESHOOTING General For correct troubleshooting of the Mass Flowmeter and Flow Controller for Liquid
17. ic performance To mitigate this 1 Keep the supply pressure as low as possible which will reduce the absorption rate 2 Keep the liquid gas interface area as small as possible which will reduce the absorption rate 3 If gas does get absorbed drain the supply liquid and refill periodically or reduce the supply pressure and agitate the liquid to drive off the gas just like shaking a bottle of soda drives off the CO A vacuum can also pull dissolved gasses from solution When a liquid flows through an orifice such as the one in the flow controller valve the pressure drops as shown in the diagram below If the inlet pressure and outlet pressure are such that the drop brings the liquid below its vapor pressure then bubbles of vapor can form These vapor bubbles can then be entrained in the liquid leaving the flow controller To prevent this a capillary restrictor can be added to the circuit which will raise the outlet pressure at the orifice so that the drop does not fall below the vapor pressure The drop through the capillary will be linear without the big dip seen in an orifice It may be necessary to then increase the inlet pressure to achieve the flow rate desired After filling the unit allow a thirty 30 minute warm up and stabilization period Pressure Diagram Inlet Pressure Outlet Pressure Vapor Pressure of Liquid Orifice In line Filter Although the process fluids and piping should be particulate free
18. is warranty shall be void as to any equipment on which the serial number if applicable has been altered defaced or removed Porter Instrument Co Inc shall under no circumstances be liable for incidental or consequential damages No other promise or statement about the equipment by any representative or authorized dealer of Porter Instrument Co Inc shall constitute a warranty by Porter Instrument Co Inc or give rise to any liability or obligation of Porter Instrument Co Inc 72 APPENDIX 1 DIMENSIONAL DRAWINGS Miodel LM Flowmeter Fitting Type A MJ TU 1 8 compression 55 126 155 60 42 11 50 5 1 8 male metal 55 124 155 42 11 50 5 gasket face seal 1 4 male metal 55 124 155 42 11 50 5 gasket face seal Note Dimensions stated in millimeters mm Dimensions subject to change without notice 13 V 11 5 11 5 11 5 APPENDIX 1 DIMENSIONAL DRAWINGS Miodel HM Flowmeter INSTRUMENT COMPANY INC Fitting Type A B H K L M T U V 1 8 compression 55 126 155 85 45 11 50 5 14 1 4 compression 1 8 male metal 55 124 155 85 45 11 50 5 14 gasket face seal 1 4 male metal 55 424 155 85 45 11 50 5 14 gasket face seal Note Dimensions stated in millimeters mm Dimensions subject to change without notice 14 APPENDIX 1 DIMENSIONAL DRAWINGS Models LC and HC Flow Controllers Model LC illustrated PORTER INSTRUMENT COMPANY
19. lean the disassembled parts Reassemble the control valve in reverse order It is recommended to replace the O ring prior to reassembly After reassembling the control valve it is recommended to check the control characteristics of the control valve This can be done by using a separate variable 15 Vdc power supply source Proceed as follows 1 Electrically disconnect the control valve from the PC board assembly 2 Electrically connect the control valve to the power supply 3 Introduce flow to the unit 4 Gradually increase the valve drive voltage using the power supply 5 The control valve should open at 7 3 Vdc 6 The control valve should be fully opened at 9 1 5 Vdc If the control valve does not operate within the voltage levels stated disassemble the control valve and adjust the orifice to the proper position Reassemble and retest Repeat the above procedure until the voltage falls within the stated levels Restriction for Liquids Please contact the factory for the viscosity limits of the flowmeter or regarding flow controller applications handling fluids having a viscosity greater than 15 centistokes Calibration All Porter Instrument s Liquid Mass Flowmeters and Flow Controllers are factory calibrated The following procedure pertains to recalibration only The calibration procedure requires the use of a digital voltmeter DVM or ammeter depending upon the type of output signal and an accurate calibration
20. nsensitive This is due to the through flow measurement design coupled with the very low temperature increase in the heater When using a mass flow controller the purge connection on the control valve must be pointed up to successfully bleed entrapped gas bubbles from the valve Avoid installation in close proximity of mechanical vibration and or strong heat sources Filling of the Flow Controller Although the unit is sensitive to gas in the sensing tube the start up procedure is simple All entrapped gas bubbles should be removed by bleeding them out the purge connection on the control valve Mass flow measurement and control of fluids can be degraded if bubbles are present in the liquid or trapped in the liquid flow control device There are two ways for bubbles to become a problem When the instrument is filled In the flow controller bubbles can get trapped in the valve These can easily be removed by opening the purge connection on top of the valve A flowmeter having no valve should not trap bubbles Initial filling of the system should be straightforward If the liquid contains dissolved gasses This usually happens when the liquid is pressurized with a gas such as Helium or Nitrogen The pressurizing gas gets absorbed into the liquid the same as carbon dioxide is absorbed into soda water These bubbles can then effervesce in the sensor and disrupt the flow measurement Bubbles collecting in the valve can also cause errat
21. s it is recommended to remove the unit from the process line and evaluate it without any liquid flow In situations where the unit is dirty this will be obvious upon removal from the system Remove the cover of the housing and confirm the valve lead connector if the unit is a flow controller is properly attached Troubleshooting Symptom No output signal Maximum output signal Output signal much lower than setpoint signal or desired flow Possible Cause No 15 Vdc power PC board failure Supply pressure too high or differential pressure across unit too high Valve clogged and or contaminated Sensor failure PC board failure Sensor failure Filter contaminated Flowmeter clogged and or contaminated Valve clogged and or contaminated Internal valve damage Unit being used on application for other than which it was calibrated Action Check power supply and cable connection Return to factory Lower supply pressure Connect a variable 15 Vdc power supply to the valve and slowly raise voltage while supply pressure is on Valve should open at 7 Vdc 3 Vdc If not clean valve internals and adjust valve qualified personnel only Return to factory Return to factory Return to factory Clean filter Clean flowmeter Clean valve Replace valve internals and adjust valve Try unit at original calibration conditions Toubleshooting Cont d Symptom Oscillation Flow at
22. uracy degradation will occur if the flowmeter flow controller is used prior to being properly warmed up E Your flowmeter flow controller is now ready for start up PORTER INSTRUMENT COMPANY INC 245 TOWNSHIP LINE RD BOX 907 HATFIELD PA 19440 0907 USA 215 723 4000 215 723 2199 TABLE OF CONTENTS Section 1 Introduction General lt page Principle of page Flow Controllers seses eregi repudia eese page 1 Control i issuer irane page 1 2 NI page 1 Liquid Conversion Factors page 2 Model Number and Description page 2 Section 2 Installation Receipt page 3 Return Shipment enrete Crita EuD NEA page 3 SEVICE Gu aa n nk a UCET page 3 MOUNGNS page 3 Filling of the Flow Controller page 3 nline Filter osa oca page 5 Process Connections page 5 Electrical page 5 Supply Pressure page 5 System Purging 0 0 0 0 eee page 5 Seals teda NON de daly oes page 5 Section 3 Operation General vise ee ER RC Use ordered Rs page 6 Power and page 6 ZeTOIUg
23. zero setpoint Output signal fluctuates Output signal is stable and flow is excessively high No control possible Possible Cause Supply pressure differential pressure too high Pressure regulator is oscillating Valve stem and or valve internals damaged Valve leaks due to damaged valve plunger or dirt in on orifice Supply pressure excessively high or low Entrapped gas bubbles Pulsations caused by pump in system Fold over and lock up by controlling system oversized orifice or pressure differential excessive Viscosity too high gt 15 centistokes 10 Action Lower supply pressure Replace pressure regulator Replace damaged parts and adjust valve Clean orifice and or replace valve plunger Apply correct supply pressure Remove entrapped gas refer to Section 2 Mounting and Filling of the Flow Controller Contact factory to dampen output signal Adjust setpoint to zero for five 5 minutes and increase setpoint slowly to 10 and above Misapplication SECTION 6 SAFETY INFORMATION FOR THE RETURN OF MASS FLOWMETERS MASS FLOW CONTROLLERS General Information Porter Instrument Co Inc bears the responsibility for the health and safety of its employees This responsibility includes the repair personnel performing the repair and or recalibration of a Mass Flowmeter Mass Flow Controller returned by the user With this in mind Porter Instrument Co requests a Declaration of
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