Model ACC32AC Signal Conditioner/Converter (AC)
Contents
1. 8 OUTPUT AMPLIFIER OMPARITOR SENS LOW PASS FILTER DEOD 12 6 8 OSCILLATOR DECOUPLING POWER SUPPLY 50 60 Hz lt LINE POWER REPLACES 500 0285 HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 110 220VAC MATERIAL CONTRACT JN DRAWN DIAGRAM ACC32 AC 55321 32 601 SCALE WEE 1 REPRODUCED OR USED FOR ANY MATERIAL SHALL HELD AUTHORIZED N DATING BTEC 2 ace AU C 2 PLACE DECIMAL 01 MUST BE RETURNED ON DEMAND ON 3 PLACE DEGMAL 005 COMPLETION OF ORDER OR OTHER FRACTIONAL 1 64 PURPOSE FOR WHICH LENT ANGULAR 1 7 NEXT ASSY USED ON APPLICATION SECTION V MAINTENANCE GENERAL Hoffer Flow Controls Flow Measurement Systems are constructed to give a long service life in the targeted measuring field and service environment However problems do occur form time to time and the following points should be considered for preventive maintenance and repairs The bearing type used in the flowmeter was chosen to give compromise between long Ife chemical resistance ease of maintenance and performance A preventive maintenance schedule should be established to determine the amount of wear which has occurred since last overhaul See user s manual for flowmeter for further instructions A spare parts list has been pr2. 32 SIGNAL CONDITIONER AC Powered Version USER S MANUAL HP 248 September 2004 N HOFFER FLOW CONTROLS INC The Turbine Flowmeter Company 107 Kitty Hawk Lane Box 2145 Elizabeth City 27906 2145 800 628 4584 252 331 1997 FAX 252 331 2886 www hofferflow com E mail info hofferflow com HOFFER FLOW CONTROLS INC MAKES WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE This manual has been provided as an aid in installing connecting calibrating operating and servicing this unit Every precaution for accuracy has been taken in the preparation of this manual however HOFFER FLOW CONTROLS INC neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages that may result from the use of the products in accordance with information contained in the manual HOFFER FLOW CONTROLS policy is to provide a user manual for each item supplied Therefore all applicable user manuals should be examined before attempting to install or otherwise connect a number of related subsystems During installation care must be taken to select the correct interconnecting wiring drawing The choice of an incorrect connection drawing may result in damage to the system and or one of the components Please review the complete model number of each it
3. TO BE DISCLOSED TO OTHERS REPRODUCED OR USED FOR ANY MATERIAL SH BT NG BY HFC USED ON YUST BE RETURNED CN DEMAND GN COMPLETION OF ORDER CR OTHER A REVISED AND REDRAWN 5 920930 DWG NO WAS ACC32 401 CS 951117 JD DWG NO WAS 500 0283 000627 lt gt 3 125 3 500 REPLACES 500 0283 HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 OUTLINE OF SIZE FSCM NO ur TOLERANCES OTHER THAN RAW BE HELD 5 FOLLOWS 2 PLACE DECIMAL 01 3 PLACE DECIMAL 005 FRACTIONAL 31 64 ANGULAR 31 2 DWG NO REV 52 401 52 ol or B ca DESCRIPTION ED SHIELD TO COMMON 10 220 VAC uD EVISED AND REDRAWN cS WG NO WAS 32 301 CS WG NO WAS 700 0115 APP 58 201 Gs VO 2 0SC 2 VIO WHT 2 2 2 3 3 SHLD ONAL OR BLK o 4 Ol 4 5 5 6 2 S PULSE 8 8 O EA Y TIL ya POB 7 HILACMOS WHT BRN 7 10 EDEK 10 AC OUT BLUE 11 INTERSTAGE INPUT 10 4 CASE GROUND UNDER SCREW REPLACES 700 0115 DRAWN HOFFER FLOW CONTROLS CHECK INTERNAL ACC32 DEMAND ON COMPLETION
4. 0 3 5 NOTES 1 USE TEST AMPLITUDE OF 100mv RMS OR LESS SINUSOIDAL WAVE FORM 2 REMOVE ALL OTHER INTERCONNECTIONS OTHER THAN THOSE SHOWN 3 OBSERVE CAUTION WHEN PREFORMING CALIBRATION 4 UNIT IS FACTORY WIRED AT TIME OF ORDER FOR 110 220VAC REFER TO MODEL NUMBER FOR CORRECT LINE POWER OPTION SELECTED 10 100 CAPACITOR 99906 OO POWER 110 220vac 2 60Hz WHT NOTE 4 GRN REPLACES 700 0111 HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 CALIBRATION SETUP FIGURE 1 AC SIZE FSCM NO DWG NO REV 332140032 602 D Al 2 PLACE DECIMAL 01 MUST BE RETURNED ON DEMAND PLACE DECIMAL 005 COMPLETION OF ORDER OTHER FRACTIONAL 1 64 ANGULAR 1 2 PURPOSE FOR WHICH LENT APPLICATION SLNIWLSNFOV 5 10 1 09 8 STOMINOD 93440H 820 006 53214384 117130 ATENISSVENS INT 7430 38 LSNA SBHOLIAS AO HOLMS INO 103135 LON ATMO NOLYALSATI 035533930 NMOHS SI Z HOLAS 9 z W130 103135 SONVY 3549 4307 OLNI Tarassyay T 123136 335 ONSA NOLLISOS MISIA NO LIMONO 0 AON 1 804 193135 CGON3MNOOR LON Sand SYJON ONISN 13
5. 0 HZ D 15 35 VDC OPTIONAL FEATURE MODEL 2 PS DIP SWITCH SELECTABLE DIVIDE BY 2 4 8 16 32 64 128 256 ENCLOSURE STYLE MODEL 2 IE OPTION 2 STYLE 2 CASE GENERAL PURPOSE 4 0 STYLE 4 CASE EXPLOSION PROOF WITH WATER TIGHT O RING MEETS CLASS I GROUP D ADALET CASE XJS WITH FLAT COVER STOCK 200 0698 CLASS GROUPS E G CLASS Ill NOTE INSERT X INMODEL NUMBER FOR EVERY OPTION NOT SPECIFIED ACC 32 1 1 HP 248 SECTION FLOWMETER INSTALLATION GENERAL Proper application of the turbine flowmeter requires a suitable piping installation in order to achieve accurate and reliable operation The piping configuration immediately preceding and following the flowmeter is termed the meter run Refer to the manufacturer s outline and installation instructions when installing the flowmeter and meter run RELATIVE The performance of the turbine flowmeter is affected by the fluid swirl and non uniform velocity profiles The following recommendation will reduce such flow irregularities It is advisable not to locate the meter run immediately downstream of pumps partially opened valves bends or other similar piping configurations In addition the area surrounding the flowmeter should be free of sources of electrical noise such as motors solenoids transformers and power lines which may be coupled to the pickoff device The meter
6. 3005 3613 Y ATSYGSSYENS NO 3514 31207 2 ATEMISSYENS CUNIVA UZAOS MOY 71 3514 SNOW Ida 100 ATSPGSSY OUY AULNIVA URMAO9 Lun E 3SV9 30 5305 SAJNIS OML MONY 7 440 26029 OL PT 29000 _ 190 05 EN a S34N0390Ud 9 211835 oza 50 ONY AWO MMOd IYAOLL dadida HINVOISNVAL ONY 3504 71 SALON SECTION IV OPERATION INITIAL STARTUP Perform any purging of piping with spool piece in place Once completed install the flowmeter and connect cabling to pickup coil If false counting action occurs turn sensitivity control counterclockwise INTRODUCTION The pulse output and analog output commence with flow through the flowmeter For the analog output the span is that established by either the factory calibration or field calibration The range is 4 20 mA into a maximum of 375 ohms of loop resistance PRINCIPLE OF OPERATION A simplified block diagram of the ACC 32 Modulated Carrier Conditioner Converter is given on the drawing ACC 32 601 Key functional blocks as well as information flow are designated The basic operation of the system is as follows The MCP on the turbine flowmeter is connected to the Model ACC 32 with a shielded twisted pair signal cable The pickup forms part of an oscillator circuit and is excited by the 32 Motion of the turbine rotor modul
7. ES TO DISCLOSED TO OTHERS TOLERANCES OTHER THAN RAW REPRODUCED a USED FOR ANY SHALL BE HELD APPLICATION 2 PLACE DECIMAL 301 3 PLACE DECIMAL 005 FRACTIONAL 31 64 ANGULAR 1 7 SIZE CAGE CODE DWG NO 215000018 ga rat PaT PURPOSE FOR WHICH LENT SECTION IH CALIBRATION OF ANALOG OUTPUT GENERAL CONSIDERATIONS LIQUID APPLICATIONS INTRODUCTION In general all flow measurement systems supplied by Hoffer Flow Controls have been factory calibrated as specified by the user at the time of purchase free of charge All systems which underwent such a factory calibration have a calibration card attached prior to shipment This card contains the details of analog outputs as well as other useful calibration data Field calibration is only required when a change has occurred or is sought to the measuring system Such a change may be due to repair replacement or recalibration of the flowmeter or perhaps a change in the analog output span PROCEDURE Begin by determining the equivalent maximum volumetric flowrate in GPM expected by the application term this GPM GPM MAX may be calculated based on the analog output scale requirements or may be the maximum flowrate listed on the flowmeter s calibration sheet From the calibration constant or K Factor listed on the data sheet for the flowmeter obtain the frequency corresponding to GPM MAX using Equation 1 and designate this
8. NT PURCHASER S SOLE AND EXCLUSIVE REMEDY IS THE REPAIR AND OR REPLACEMENT OF NONCONFORMING GOODS AS PROVIDED IN THE PRECEDING PARAGRAPHS HFC SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES Disclaimer Specifications are subject to change without notice Some pages are left intentionally blank HFC 9708 TABLE OF CONTENTS SECTION I INTRODUCTION AND 8 2 22022 422 1 1 1 SECTION INSTALLATION 9 DO ER 2 1 SECTION IH CALIBRATION nn 3 1 SECTION IV OPERATION een een 4 1 SECTION V MAINTENANCE AND SCHEMATIC dais 5 1 SECTION I ACC 32 MODULATED CARRIER CONDITIONER VOLTAGE CONVERTER The ACC 32 Modulated Carrier Conditioner Converter is an active pickoff accessory for the turbine flowmeter which provides a pulse output and an analog voltage output proportional to flowrate The Modulated Carrier principle eliminates the pickoff drag associated with conventional magnetic pickoffs resulting in a significant increase in the usable range of a turbine flowmeter at lower rates The ACC 32 excites a series MCP pickup mounted on the turbine flowmeter Sensed through the flowmeter body the motion of the turbine rotor modulates the coil field subsequent conditioning provides a pulse output signal where each pulse is representative of a discrete
9. OF ORDER OR OTHER PURPOSE FOR WHICH LENT SIZE FSCM NO DWG NO REV 331 0032 30 PEE 1 APPLICATION NOTES 1 TO 7 OR 8 DEPENDING SPECIFIED POWER OPTION SELECTED TYPE OF OUTPUT WAVEFORM AND 2 UNIT IS FACTORY WIRED AT TIME OF ORDER FOR 110 220VAC REFER TO MODEL NUMBER FOR CORRECT LINE 4 20mA OUTPUT PULSE OUTPUT SIGNAL ____ 55 USED ON li APPLICATION OPTIONAL WIRING SEE NOTE 1 TB Y O O 110 220VAC POWER INPUT G MATERIAL CONTRACT UN rc 5 10 DISCLOSED TO DRAWN 2 OFFER NOT DIMENSIONS ARE IN INCHES TOLERANCES OTHER THAN RAW ALL BE HELD 2 PLACE DECIMAL 01 3 PLACE DECIMAL 005 05 1 0SC2 SHIELD CURRENT OUT COMMON CURRENT OUT PULSE COMMON CMOS TTL PULSE OUT 7 SM OPEN COLLECTOR AC PULSE OUTPUT POWER INPUT CHASSIS GROUND REPLACES 700 0113 HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 INSTALLATION ACC32 AC SIZE FSCM NO DWG NO 352 32 701 NOTES 1 ENCLOSURE MEETS CLASS GROUP D CLASS GROUP 6 NEMA 7 9 2 USED WHEN SIGNAL CONDITIONER 15 ENCLOSED MOUNTED OR REMOTE 3 13 16 HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 ED Am Nor DIMENSIONS ARE IN INCH
10. TCH POSITION MAX 75 TO 150 150 TO 300 300 TO 600 600 TO 1200 1200 TO 2400 ACC 32 3 2 HP 248 HOFFER FLOW CONTROLS INC 149 Highway 36 PO Box 130 Port Monmouth N J 07758 201 787 1997 TWX 710 722 5624 FAX 201 787 3639 Application of ACC Series Signal Conditioner Converters to Gas Measurement Applications under fixed temperature and pressure General Hoffer s ACC Series of Signal Conditioner Converters are often applied to gas metering applications Where the analog output is to represent a mass flow rate or the equivalent amount of gas at reference conditions special considerations need to be applied These considerations are outlined in the following paragraphs Conversion to Volumetric Flow Rates Where a analog output span is to be setup as flowrate expressed in mass units or in equivaent flow of gas at a reference condition a conversion to equivalent ACFM is necessary before the calibration and setup may be performed Begin by converting the given flowrate to SCFM units of measure at a reference condition of 70 degrees F and a pressure of 14 696 PSIA Next Convert the assumed flowing pressure to units of PSIA designate this FLOWING_P Next convert the assumed fowing temperature to units of Degrees Rankine designate this FLOWING_T Next calculate the equivalent maximum flowrate under the assumed line pressure and temperature to find the equivalent ACFM using the
11. alibration is supplied separately Factory consultation is available to assist in diagnosing problems Note that in some cases factory repairs can be performed more easily than can be accomplished in the field Failure conditions are listed and the possible corrective actions given to eliminate the observed problem GENERAL INSPECTION TO DETERMINE IF UNIT IS OPERATING PROPERLY Proper operation of the ACC 32 can be assumed when with power applied to the unit 1 The pulse output produces a pulse train of the desired amplitude when flow through the flow transducer occurs 2 The analog output produces a voltage output signal of 4 20 mA with a span corresponding to that established by the calibration procedure ACC 32 5 1 HP 248 OBSERVED CONDITION A NO PULSE OUTPUT B PULSING OUTPUT WITH NO FLOW C ANALOG OUTPUT MALFUNCTION NOTE ACC 32 PROBLEM CORRECTIVE ACTION 1 209 5 2 Inspect terminal strip wiring for conformity to the installation instructions and for acceptance workmanship Verify fuse is good with an ohm meter See dwg ACC 32 403 AC power only Determine if flowmeter rotor is fouled Defective pickup coil Replace MCP Defective cable Replace Defective ACC 32 Repair or replace Input voltage below limits Defective pickup coil Replace Defective cable Replace Defective ACC 32 Repair or replace Improper wiring termination Correct
12. ates the oscillator output A demodulator converts the AM signal to a signal at a frequency determined by the rotor speed The low level demodulated signal is then passed through a signal conditioning chain where it is filtered amplified and shaped into a train of digital pulses whose frequency is related to the volume flowrate and where each pulse represents a discrete volume of fluid ANALOG OUTPUT The signal entering the frequency to analog converter is passed through a combination of a divide by N and a DIP switch MATRIX The QN output is chosen whose pulse rate is between 75 and 150 Hz at the maximum flowrate to be measured This scaled pulse rate is fed to a precision monostable circuit The output of the monostable is then filtered into an analog voltage that is proportional to volumetric flowrate The output amplifier is a voltage to current amplifier If offers zero and span available in a standard process range of 4 to 20 mA POWER SUPPLY The power supply provides for operating bias voltage for all internal circuitry The output amplifier may be configured to provide one of the following 1 High level AC square wave Capacitively coupled 2 Open collector transistor 3 TIL CMOS compatible square pulse of 5 volt amplitude The output amplifier is buffered from the signal driving the analog output ACC 32 4 1 HP 248 DATE APP 10 20 2 8 9 920929 WAS 500 0285 000627 Ex
13. been equipped connect wiring to appropriate terminals and load A shielded twisted pair wire is recommended Ground shield on one end only Use some precautions as described for flowmeter input signal ACC 32 22 HP 248 NOTES 1 FACTORY RECOMMENDS 10 PIPE DIA UPSTREAM AND 5 PIPE DIA DOWNSTREAM REDRAWN ____________ 92 OF SAME SIZE PIPE AS FLOWMETER A B 37 92 FLOW STRAIGHTENER IS RECOMMENDED E IF THIS IS NOT POSSIBLE OR FOR CUSTODY TRANSFER APPLICATIONS BYPASS RUN Vi V2 BLOCKING VALVE MF SERES 100 FS FLOW STRAIGHTENER TURBINE FLOWMETER v3 BYPASS VALVE 7 4 REPLACES INSTL 104 DRAWN LLL HOFFER FLOW CONTROLS INC ELIZABETH CITY NC 27909 TYPICAL TURBINE INSTALLATION SIZE CAGE CODE DWG NO REV FINISH REPRODUCED OR USED FOR ANY MATERIAL SHALL BE HELD OTHER PURPOSE EXCEPT AS 5 FOLLOWS AUTHORIZED IN WRITING BY HFC NEXT ASSY USED ON Ws EE a DEMAND ON 2 PLAGE 50 APPLICATION 533215000194 PACTON 21 96 SCALE dRAWINGS 500 50001941 DWG NOTES 1 EQUIPPED FOR ANALOG OUTPUT OPTION 2 UNIT MAY BE INSTALLED IN EXPLOSION PROOF ENCLOSURE NEXT ASSY APPLICATION PURPOSE FOR WHICH LENT MATERIAL CONTRACT UN FLOW CONTROLS INC HFC NOT DIMENSIONS ARE IN INCHES
14. em to be connected and locate the appropriate manual s and or drawing s Identify all model numbers exactly before making any connections A number of options and accessories may be added to the main instrument which are not shown on the basic user wiring Consult the appropriate option or accessory user manual before connecting it to the system In many cases a system wiring drawing is available and may be requested from HOFFER FLOW CONTROLS This document contains proprietary information which is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of HOFFER FLOW CONTROLS INC HOFFER FLOW CONTROLS policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering The information contained in this document is subject to change without notice RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the Hoffer Flow Controls Customer Service Department telephone number 252 331 1997 or 1 800 628 4584 BEFORE RETURNING ANY PRODUCT S TO HOFFER FLOW CONTROLS PURCHASER MUST OBTAIN A RETURNED MATERIAL AUTHORIZATION RMA NUMBER FROM HOFFER FLOW CONTROLS CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned RMA number should then be marked on the outside of the return package and
15. equation which follows 14 696 FLOWING_T SCFM X y Finally follow the setup procedure listed for the Signal Conditioner to determine the equivalent full scale frequency for this application Follow the procedure listed in the User s Manual and the calibration setup listed to adjust the span and zero controls to achieve the desired analog span Note that the above procedure assumes the standard conditions to be 70 degrees F and 14 696 PSIA these vary reference conditions from industry to industry and from country to country It is important that any variations of the reference conditions be considered in the setup of the instrument 9508 REV 2 00 3 4 3 CALIBRATION OF ANALOG OUTPUT GENERAL CONSIDERATIONS FOR GAS APPLICATIONS INTRODUCTION In general all flow measurement systems supplied by Hoffer Flow Controls have been factory calibrated as specified by the user at the time of purchase free of charge All systems which underwent such a factory calibration have cali bration card attached prior to shipment This card contain the details of analog outputs as well as other useful calibration Field calibration is only required when a change has occurred is sought to the measuring system Such a change may be due to repair replacement or recalibration of the flowmeter or perhaps a change in the analog output span PROCEDURE Begin by det
16. ermining the equivalent maximum volumetric flow rate in expected by the application term this MAX may be calculated based on the analog output scale require ments or may be the maximum flow rate listed on the flowmeter s calibration sheet From the calibration constant or K Factor listed on the data sheet for the flowmeter obtain the frequency corresponding to ACFM MAX using Equation 1 and designate this frequency Equation 1 Fray X ACFNiay 60 The analog output of the ACC 32 may be calibrated with the aid of an external oscillator used in conjunction with a frequency counter The external oscillator is used to supply a test frequency this method the external oscillator is connected to the signal input terminals as shown in Figure 1 The oscillator s output frequency is set to equal F MAX as indicated on the frequency counter 1 The course range adjustment is accomplished by selecting switch position on a DIP switch located on the PCA 58 printed circuit card See Table A to determine required switch posi tion and set into switch as shown on drawing ACC 32 403 for anticipated F MAX NOTE It is necessary to open the cover of the enclosure by removing two screws on side of box and lifting cover Two printed circuit cards are attached The RANGE Dip Switch may be programmed with a pen Input power should be removed during this step HFC 9508 REV 2 0
17. frequency Equation 1 F max avg X GPM max 60 FOR ANALOG OPTION The analog output of the ACC 32 may be calibrated with the aid of an external oscillator used in conjunction with a frequency counter The external oscillator is used to supply a test frequency In this method the external oscillator is connected to the signal input terminals as shown in Figure 1 The oscillator s output frequency is set to equal F MAX as indicated on the frequency counter 1 The course range adjustment is accomplished by selecting a switch position on a DIP switch located on the PCA 58 printed circuit card See Table A to determine required switch position and set into switch as shown on drawing ACC 32 403 for anticipated F ACC 32 3 1 HP 248 NOTE It is necessary to open the cover of the enclosure by removing two screws on the side of the box and lifting cover Two printed circuit cards are attached The RANGE Dip Switch may be programmed with a pen Input power should be removed during this step 2 Connect a digital milliampmeter or equivalent across the voltage output terminals 3 Adjust SPAN control fully counter clockwise or 20 turns 4 Adjust ZERO control for desired zero current i e 4 mA 5 Inject the Test Frequency equal to F MAX while adjusting SPAN for current equal to 20 mA See test setup shown in Figure 1 NOTE Iterate steps 4 and 5 until no change is observed Table A RANGE SELECT SWI
18. goods as provided in the following paragraphs In the event Purchaser believes the goods are defective the goods must be returned to HFC transportation prepaid by Purchaser within twelve 12 months after delivery of goods or eighteen 18 months for goods delivered outside the continental United States for inspection by HFC If HFC s inspection determines that the workmanship or materials are defective the goods will be either repaired or replaced at HFC s sole determination free of additional charge and the goods will be returned transportation paid by HFC using the lowest cost transportation available Prior to returning the goods to HFC Purchaser must obtain a Returned Material Authorization RMA Number from HFC s Customer Service Department within 30 days after discovery of a purported breach of warranty but no later than the warranty period otherwise such claims shall be deemed waived See the Return Requests Inquiries Section of this manual If HFC s inspection reveals the goods are free of defects in material and workmanship or such inspection reveals the goods were improperly used improperly installed and or improperly selected for service intended HFC will notify the purchaser in writing and will deliver the goods back to purchaser upon i receipt of Purchaser s written instructions and ii the cost of transportation If Purchaser does not respond within 30 days after notice from HFC the goods will be disposed of i
19. ing section should not be subjected to excessive vibration or shock Such a condition may result in an mechanically induced output signal from the pickoff device METER RUN In general the meter run should be chosen to have the same inner diameter as the meter bore A minimum of 10 pipe diameters of straight pipe upstream and 5 pipe diameters downstream are required Where this optimum line configuration can not be implemented it is advisable to install a flow straightener properly positioned upstream of the flowmeter Orientation is not a critical factor however horizontal is a preferred orientation BYPASS RUN A properly sized bypass run with suitable blocking valves may be equipped where an interruption in fluid flow for turbine meters servicing can not be tolerated STRAINER A strainer filter and or air eliminator is recommended to reduce the potential of fouling or damage See table for recommended mesh size On initial startup of a line it is advisable to install a spool piece purging the line to eliminate damaging the flowmeter due to flux tape solder welds or other contaminates carried along by the fluid stream CAVITATION Cavitation causes measurement inaccuracies in turbine flowmeter and should be avoided by suitable line and operating configurations Whenever the pressure within a pipeline instantaneously falls below the equilibrium vapor pressure of the fluid a portion of the fluid vaporizes and forms bubbles in the pi
20. n HFC s discretion HFC does not warrant these goods to meet the requirements of any safety code of any state municipality or any other jurisdiction and purchaser assumes all risk and liability whatsoever resulting from the use thereof whether used singly or in combination with other machines or apparatus This warranty shall not apply to any HFC goods or parts thereof which have bee repaired outside HFC s factory or altered in any way or have been subject to misuse negligence or accident or have not been operated in accordance with HFC s printed instructions or have been operated under conditions more severe than or otherwise exceeding those set forth in the specifications for such goods THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTLY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HFC SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF LOSS OF USE OF THEGOODS WITHOUT LIMITING THE GENERALITY OF THE FOREGOING THIS EXCLUSION FROM LIABILITY EMBRACES THE PURCHASER S EXPENSES FOR DOWNTIME DAMAGES FOR WHICH THE PURCHASER MAY BE LIABLE TO OTHER PERSONS DAMAGES TO PROPERTY AND INJURY TO OR DEATH OF ANY PERSON HFC NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OR USE OF HFC S GOODS AND THERE ARE NO AGREEMENTS OR WARRANTIES COLLATERAL TO OR AFFECTING THE AGREEME
21. on any correspondence FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS OR following information available BEFORE contacting CALIBRATIONS consult HOFFER FLOW HOFFER FLOW CONTROLS CONTROLS for current repair calibration charges Have 1 P O number under which the product was the following information available BEFORE contacting PURCHASED HOFFER FLOW CONTROLS 2 Model and serial number of the product under 1 P O number to cover the COST of the warranty and repair calibration 3 Repair instructions and or specific problems relative 2 Model and serial number of the product and to the product HFC 9708 3 Repair instructions and or specific problems relative to the product LIMITED WARRANTY HOFFER FLOW CONTROLS INC HFC warrants HFC s products goods described in the specifications incorporated in this manual to be free from defects in material and workmanship under normal use and service but only if such goods have been properly selected for the service intended properly installed and properly operated and maintained This warranty shall extend for a period of 1 year from the date of delivery to the original purchaser or eighteen 18 months if the delivery to the original purchaser occurred outside the continental United States This warranty is extended only to the original purchaser Purchaser Purchaser s sole and exclusive remedy is the repair and or replacement of nonconforming
22. ovided which at the discretion of the user may be user stocked Consult with the manufacturer if an abridged spare parts list is sought The recommended spare parts list may be found following this section and in the user s manual for the flowmeter In case the flow measurement system malfunctions or becomes inoperative a troubleshooting procedure is enclosed Factory consultation is available to assist in diagnosing problems In addition factory repair parts and service are available for individuals who wish to utilize this service A complete set of schematic diagrams for all printed cards is available from Hoffer Flow Controls for users who wish their own personnel to service the measuring systems NOTE All printed circuit cards are warranted for one year after date of sale Allprinted circuit cards may be factory repaired at a nominal fee for parts and labor after warrantee period TROUBLESHOOTING AND MAINTENANCE INTRODUCTION In case of an inoperable or malfunctioning system the following procedures can be used to isolate the faulty wiring printed circuit boards and or alternate causes The majority of repairs can be made in the field thereby reducing the time a unit is out of service A recommended spare parts list is given immediately following the troubleshooting portion of this manual The necessary documentation is contained with this manual with the exception of the calibration data sheet for the turbine flowmeter This c
23. peline This is termed cavitation Cavitation is eliminated by maintaining adequate back pressure on the flowmeter A downstream valve that provides the necessary back pressure is one means for preventing cavitation in the metering run Control valves should be located downstream if possible Some installations may also make use of a vapor eliminator upstream of the flowmeter The minimum required back pressure may be estimated using Error Reference source not found Min Back Pressure 1 25 X Vapor Pressure 2 X Pressure Drop ACC 32 2 1 HP 248 INSTALLATION WIRING LAYOUT FOR INTERCONNECTIONS USING MCP PICKUP In considering the interconnection between the flowmeter and the flow measurement ystem some attention must be given to anticipated noise sources and to the coupling of these noise sources to the interconnecting wiring Noise signals may be coupled inductively or capacitvely into the wiring between the flowmeter and the electronic measuring systems In general utilizing a shielded twisted pair for the interconnection greatly reduces this coupling The shield should be grounded on one end of the cable only In general grounding only on the electronic measuring system is best However even with proper interconnecting cabling crosstalk with other signal lines or power lines may still occur and should be avoided Physical isolation in the manner in which the wiring is run reduces the chances of potential problems The turbine flowme
24. ter equipped with a Modulated Carrier Pickup MCP should not be located more than 100 feet from the Modulated Carrier Conditioner It is recommended that the Modulated Carrier Conditioner be installed on or near the flowmeter to assure proper operation Enclosures suitable for mounting in hazardous and wet areas are available INSTALLATION OF 32 POWERED The Model ACC 32 should be placed in a convenient location which maintains access to the unit should repairs or readjustment be required Refer to outline and installation drawing for the appropriate case type to be installed Drill appropriate mounting holes as required Refer to wiring installation drawing for the appropriate terminals for interconnections Connections to the terminal block should be carefully dressed to avoid having bare wires extend pass the screw clamp on the terminal block Wires should be neatly dressed near bottom of enclosure to assure wiring will not become fouled when cover is installed Connect two conductor shielded cables from flowmeter Connect shield to ACC 32 only Line power connection should be made through a circuit breaker so that power can be turned off while servicing accessory model Power is 117V or 220 240 VAC An earth ground connection is also required Connect pulse output is used several output pulse waveforms are available factory equipped Wire to appropriate terminal for waveform desired and specified If the analog output has
25. volume of fluid and where the frequency is proportional to flowrate Pulse scaling is optionally available to reduce output pulse rate where required The analog output is generated by passing the pulse output frequency signal to a frequency to the voltage converter to generate a voltage proportional to flowrate Flowmeters compatible with the ACC 32 are available in nominal sizes below two inches Larger flowmeters do not require a modulated carrier pickup SPECIFICATIONS INPUT Pickup Type Compatible with Series MCP pickoff Transmission distance dependent on output waveform and drive requirements Cable type Beldon 8422 Modulation frequency range 10 Hz 3500 Hz PULSE OUTPUT Open collector VMOS transistor 2N6660 Square Waveform Maximum OFF state voltage 60 VDC Maximum ON current 1 0 amps TTL CMOS fanout of 10 TTL CMOS loads capacitively coupled square wave PULSE SCALING 2 4 8 16 32 64 128 256 CAPABILITY OPTIONAL ACC 32 1 1 HP 248 ORDERING INFORMATION MODEL 32 PULSE OUTPUT ANALOG OUTPUT INPUT POWER OPTIONAL FEATURE ENCLOSURE STYLE PULSE OUTPUT MODEL 2 1 _ OPEN COLLECTOR 2 2 TTUCMOS 3 SQUARE WAVE 5 0 10 SQUARE WAVE ANALOG OUTPUT MODEL 2 X NONE 4 20 INPUT POWER MODEL 2 OPTION 115 50 60 HZ 220 VAC 50 6
26. wiring ACC 32 improperly calibrated Recalibrate Defective circuitry within the 32 Factory repair ACC 32 Refer to flowmeter user s manual for repair instructions for the turbine flowmeter HP 248 Table 1 Recommended Spare Parts List MODEL ACC 32 MODULATED CARRIER CONDITIONER CONVERTER PART NUMBER DESCRIPTION QUANTITY 1 20 AMP Fuse power supply AC Power Only 1 Box ACC 32 XX Modulated Carrier Conditioner Converter 1 Modulated Carrier Pickup 1 NOTE Additional spare parts be recommended for the turbine flowmeter See user s manual for turbine flowmeter for details 32 5 3 248
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