Level HART manual v3.0
Contents
1. ojojo H1 9 i GND JA 33 J2 4 EEA IMO ozad i HO LEDs Figure 5 CPU board and power supply board simplified component layout Test points are located on the Power Supply and CPU board Power Supply Test point label H1 H2 TP1 TP2 Description Not used Not used Isolated ground Loop current test point 200mV mA loop current Referenced to isolated ground CPU Test point label Count GND U5 pin8 Description Raw input signal coming from preamp Logic ground 5V power supply test points referenced to Logic ground 30 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Diagnostics and repair Jumpers Jumpers J1 J4 on the CPU board are used as divide by values for the output frequency to the Smart Pro Note Do not change the jumper from the current setting without consulting Ohmart Field Service J1 divide by 20 J2 divide by 10 J3 divide by 5 J4 divide by 2 none divide by 1 If no jumper is installed the divide by value is one no change is made to the output frequency FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 31 Diagnostics and repair LED indicators Basic functioning of the Ohmart electronics can be checked at the instrument with LED indicators on the CPU board They are visible when the explosion proof housing cap is removed See the foll2. 0 pressure compensation Screen 529 item 120 44 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Appendix Special applications Internal heater kit for applications below o 50 C A heater kit option is available for applications that require a 50 C 58 F temperature rating With the heater option the internal temperature of the unit rises approximately 20 C 68 F degrees The heater kit does not affect the functionality of the level detector in any way no special firmware is required Heater kit power Ohmart Part Number 115 VAC 240723 220 VAC 240724 Changes to specifications If the heater kit is installed the power rating changes from the specifications on page 3 of this manual With the heater installed the maximum power consumption increases to 25 watts FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 45 Index Index ZA applications 12 Ze Cal Hi on Process 29 Cal Lo on Process 28 calibration initial See initial calibration process 26 calibration curve 27 CPU board jumpers 39 replacing 41 Customer Order C O Number 13 required for repairs 43 D drawings 46 F Field service See Ohmart Customer Service initial calibration 26 new required 34 jumpers 39 48 aa po linearizer 27 low temperature application 53 M Max Reading 27 Min Reading 27 O Ohmart Customer Service 13 Field Service
3. 0 WARNING This equipment is only to be used in the manner described in this manual If the equipment is not used per Ohmart VEGA specifications the unit is not CE compliant and may be damaged or cause personal injury ii FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Contents Table of figures v Table of procedures v Explanation of symbols vi User s comments vii Chapter 1 Introduction 1 Nuclear materials notice 1 Unpacking the eguipment 1 Storing the eguipment 2 FiberFlex model LXFG F specifications 3 Typical applications 4 Where to find help 5 Ohmart Customer Service 5 Principles of operation 6 System overview 6 Chapter 2 Installation 9 Location considerations 9 Mounting the detector 11 Wiring the equipment 12 Power 14 Conduit 14 Commissioning the gauge 15 Can you remove the source holder lock 15 Field service commissioning call checklist 16 Chapter 3 Calibration 17 Initial process calibration with Smart Pro 18 Choosing the initial calibration method 18 Set process span 19 Cal Lo on Process 20 Cal Hi on Process 21 Calculate calibration with Two Point Cal 22 Creating a linearizer curve optional 23 When a new initial calibration may be necessary 26 Periodic re cal 27 Chapter 4 Diagnostics and repair 29 Software diagnostics 29 Hardware diagnostics 29 Test points 30 Jumpers 31 LED indicators 32 Maintenance and repair 33 Periodic maintenance schedule 33 Spare parts 33 Replacing the
4. 13 Ohmart Field Service 9 43 Ohmart Parts and Repairs 41 P Power supply board replacing 41 R re cal 35 repairs material return authorization MRA number 43 returning eguipment to Ohmart 43 nk a shutter check freguency 41 source holder 14 source holder lock 23 source wipe freguency 41 spare parts 41 specifications FiberFlex 11 heater kit changes 53 storage 10 T test points 38 V vessel agitators effect 18 46 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0
5. Access screen 529 item 120 Enter a value of 1 at this address to enable the pressure compensation feature A value of 0 disables the pressure compensation Pressure compensation is now set up but it must be fine tuned to work properly Pressure compensation fine tuning Since variables such as the vessel geometry process material characteristics and pressure change ranges affect the output it is difficult to accurately predict the gain term needed for an individual installation Fine tuning the system requires maintaining a known 42 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Appendix Special applications level of process material and changing the gaseous vapor pressure By observing how the system reacts you will adjust the gain term value on Smart Pro screen 529 item 110 Follow the general guidelines below 1 2 In the vessel establish a known repeatable minimum pressure Establish a process level of approximately 30 to 60 Make note of the initial level indication as displayed on the Smart Pro operator screen Increase and maintain pressure to some value near the maximum pressure likely to be present inside the vessel Do not adjust the process level in the vessel Allow time for the level measurement to stabilize Compare the level measurement at maximum pressure to the measurement at minimum pressure e Ifthe level indication at maximum pressure is ess than at minimum pressu
6. Frequency Output User Manual v1 0 firmware 1 0 Diagnostics and repair Maintenance and repair Periodic maintenance schedule Since the Ohmart LFXG F contains no moving parts very little periodic maintenance is reguired We suggest the following schedule to prevent problems and to comply with radiation regulations Description Freguency Procedure Re cal As reguired by process conditions Calibration chapter usually at least once a month Source holder Every 6 months unless otherwise Radiation safety instructions shutter check reguired by applicable nuclear shipped separately with regulatory agency source holder and in the folder of this manual Source wipe Every 3 years unless otherwise Radiation safety instructions reguired by applicable nuclear shipped separately with regulatory agency source holder and in the folder of this manual Spare parts Spare parts are available directly from Ohmart Parts and Repairs Department for U S and Canada installations Installations in other countries may have spare parts purchased through their local Ohmart representative Description Ohmart part number power supply board 239747 CPU board 421110 125 mA fuse on power supply 238661 2A fuse on power supply 240539 Replacing the CPU or Power Supply board Very few parts are field repairable but the circuit boards can be replaced Use great care to prevent damaging the electrical components of the gauge we recommend appropriate electrosta
7. M Empty the vessel M Enter the password for Supervisor level access on screen 052 M Verify on screen 502 that the Smart Pro is receiving the frequency input from the level detector usually above 9000 counts for an empty vessel Cal Lo on Process 1 2 Be certain the correct Product Code has been selected From the main Menu use the lt Select gt and lt Enter gt keys to progress through these screens CALIBRATE SYSTEM CALIBRATE GAGE SELECT CHANNEL CHOOSE CHANNEL 1 MORE CAL FUNCTIONS 3 TIMES CAL LO ON PROCESS On the caL Lo on PRocess the detector will measure the sample and the Smart Pro and will display collecting data When prompted enter the actual level Save the results to the EEPROM On screen 102 RAM To EEPROM enter a 1 to upload to the EEPROM for permanent storage The error code on screen 102 should read 0 indicating the Smart Pro was successful in transferring the RAM data to the EEPROM Procedure 1 Cal Lo on Process 20 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Cal Hi on Process Cal Hi on Process sets the gain of the calibration curve Setting the high level for calibration can be simulated by shutting the source holder shutter In some cases simulating the high level may not be accurate but you can adjust for it later when the tank is full See Procedure 5 Manually entering Cal Low and Cal High counts Before starting the cal high data coll
8. Manual v1 0 firmware 1 0 39 Appendix Special applications Detector wiring Multiple detector applications require at least two frequency output detectors electrically linked in a chain Only the last detector in the chain sends an output to the Smart Pro The LFXG F automatically sums the frequency input auxiliary input pins 11 12 with the frequency it generates in response to radiation The summed frequency is output at pins 6 7 When no input is present at pins 11 12 the output is only the detector s response to the radiation Jumpers to reduce counts The Smart Pro cannot accept more than 32767 counts per second If the total counts exceeds this a jumper can be set on the last detector in the chain to divide the output to the Smart Pro This must be set before calibrating Verify the frequency is under 32767 with a meter at the Smart Pro input terminal on empty vessel condition If the frequency exceeds 32767 adjust the jumper on the last detector as required according to the table below J1 divides counts by 20 J2 divides counts by 10 J3 divides counts by 5 J4 divides counts by 2 Initial settings and calibration requirements No special Smart Pro software initial settings or calibration methods are required The detectors automatically sum the frequencies so the use of multiple detectors is transparent to the Smart Pro When setting the span settings and calibrating use the levels for the entire measurement span a
9. User s 2 NPT pipe nipple ae 2 NPT threaded conduit adapter User s 2 conduit Supplied 1 1 4 conduit clamps Je with 1 4 mounting hole hardware 4 places dei EM A NA Installation Bracket Mounting Optional pipe mounting shown Figure 2 Conduit and bracket mounting FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 11 Installation Note The active area where it is possible to make a level measurement is between the bottom of the housing and the end of the flexible conduit Mount the detector so that this area spans the desired measurement length Wiring the equipment Note You may have received an interconnect drawing from Ohmart or the engineering contractor If the instructions on the drawing differ from the instructions in this manual use the drawing It may contain special instructions specific to your order Follow the drawing notes and the steps which follow for making the input and output connections Connections are made at the removable terminal strips mounted on the CPU board which is accessed by removing the explosion proof housing cap 12 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Installation POWER IN POWER IN OUTPUT SIGNAL CABLE SEE NOTES 2 amp 3 SEE NOTE 2 oe SEE NOTE 1 is AUXILIARY V FREQUENCY EARTH GROUND P INPUT Bek MEASURE POWER CABLE W
10. line where the temperature of the process material is relatively stable Process temperature changes may affect the gauge indication The amount of the effect depends upon the sensitivity of the gauge and the temperature coefficient of the process material Protect insulation If insulation is between the measuring assembly and the process protect the insulation from liquids The absorption of a liquid such as water could affect the gauge indication because it blocks some radiation Avoid internal obstructions The best possible installation of a nuclear level gauge is on a vessel that has no internal obstructions agitator baffle manways directly in the path of the radiation beam If one of these obstructions is FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 9 Installation present it can shield the radiation from the detector causing an erroneous reading If the vessel has a central agitator the source holder and detector can be mounted on the vessel on an arc other than a diameter so that the beam of radiation does not cross the agitator Similarly other obstructions can be avoided Avoid external obstructions Any material in the path of the radiation can affect the measurement Some of these like the tank wall liners and insulation that are present when the gauge is initially calibrated pose no difficulty since their effect is accounted for in the calibration However when the materials change or ne
11. method to use Calibration with a linearizer curve Calibration with no linearizer curve Use a linearizer curve if the gauge is Don t use a linearizer curve if the gauge is required to be repeatable and accurately only required to be repeatable but need not indicate the level of process throughout the accurately indicate the level of process span Typically used for vessels in which it is critical Typically used for surge bins or other vessels to know the accurate level under control in which one level is to be maintained The linearizer curve must be turned on after The linearizer curve must be turned off collection of linearizer data and entering the Screen 528 item 41 set to 0 curve in the Smart Pro Screen 528 item 41 set to 1 Note If you don t use a linearizer curve the measurement indication will be repeatable but not accurate between the Cal Low Level and Cal High Level points The measurement indication will also not be linear with respect to the actual process level In some applications accuracy is not critical and this method can be used If your application requires a linear or accurate indication of the actual process level you must use a linearizer curve 18 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Smart Pro Note Refer to the Smart Pro Mini Guide to Fast Startups for step by step calibration instructions Also Chapter 3 of the Smart Pro Reference provides deta
12. on specific application parameters 6 to 276 153mm to 7010mm in 12 153mm increments 0 66MeV gamma radiation emitter 30 2 year half life 1 2 and 1 3 MeV gamma radiation emitter 5 3 year half life 90 to 270VAC at 50 to 60Hz at 15VA maximum power consumption 25 VA max with heater CE compliance requires 100 to 230 10 VAC 20 to 60VDC less than 100mV 1 to 1000Hz ripple at 15VA CE compliance requires 24VDC 3280ft 1000 m Organic scintillator fibers encased in galvanized steel flexible conduit covered by Santoprene thermoplastic rubber 1 foot 305 mm minimum 1 3 4 44 mm Angle bracket standard 2 conduit mount detector inside conduit optional 18 22 AWG 0 82 0 33 mm four conductor shielded eDesigned to meet National Electric Code U S amp Canada eClass Groups B C amp D Div 1 amp 2 for 115 VAC 220 VAC pending Class Group A pending for 115 VAC and 220 VAC eClass Il Groups E F amp G Div 1 amp 2 for 115 VAC 220 VAC pending EExd IIC T5 pending NEMA 4X IP 66 4 F to 140 F 20 C to 60 C option for lower temperatures available 0 95 noncondensing Tested to IEC 68 2 6 IEC 68 2 27 and IEC 68 2 36 Cast aluminum ASTM A 357 Epoxy Powder Coat 12 lb 1 Ib x active length in feet 5 44 kg 1 49 kg x active length in meters 5V Memory Corruption CPU Active High Voltage Power specifications change to 115 VAC or 220 VAC if an internal heater kit is used For more
13. radiation gets blocked and the less is sensed by the detector The material in the vessel essentially acts as a shield preventing a portion of the detector from being exposed to the radiation field The gauge is calibrated to associate the detector readings called counts with the level of the material in the desired engineering units The output of the detector is a 0 100 kHz true digital frequency output in proportion to the level of the process System overview The level measurement system consists of three main components e source holder e FiberFlex LFXG F detector e Smart Pro or Pro Pac Electronics Source Holder FiberFlex Detector l IN Freguency output 4 20 mA from Smart Pro Figure 1 System overview The source holder is a cast or welded steel device used to house a radiation emitting source capsule The source holder directs the 6 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Introduction radiation in a narrow collimated beam through the process pipe or vessel it shields the radiation elsewhere The source holder model chosen for each particular system depends on the source capsule enclosed and the radiation specifications reguired A shutter on the source holder is used to either completely shield the radiation source off or allow it to pass through the process source on The FiberFlex level detector assembly is mounted opposite the source holder Inside the
14. to progress through these screens CALIBRATE SYSTEM CALIBRATE GAGE SELECT CHANNEL CHOOSE CHANNEL 1 SIMPLE RE CAL LOW On the caL START STOP screen press lt Enter gt to Start data collect The gauge will measure the sample and the Smart Pro will display collecting data On screen 145 the Smart Pro will display the counts for the data collect It prompts Save results Select Yes to save the re cal results The Smart Pro will automatically save the results to the EEPROM When finished it will display Attempt completed Select Done to finish Procedure 8 Performing a Simple Re Cal on Low 28 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Diagnostics and repair Chapter 4 Diagnostics and repair Software diagnostics Refer to the Smart Pro manual for software diagnostics information Hardware diagnostics Two circuit boards in the LFXG F are replaceable They are identified below Power supply board Terminal block Figure 4 Circuit board identification The following figure may be helpful in finding test points fuses jumpers and connectors on the CPU circuit board FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 29 Diagnostics and repair Test points CPU Board Power Supply Board O O i ISO 5V 3 2 4 eee m eo _ e TPI 3 2 4 Olgi T2 TP3 z COUNTS ii O 24V m 2 O U6 e Q Gih
15. CPU or Power Supply board 33 Requesting field service 35 Returning equipment for repair to Ohmart 35 Preface FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 ili Preface Appendix Special applications 37 Multiple detectors summation 38 Installation reguirements 39 Jumpers to reduce counts 40 Initial settings and calibration requirements 40 Vapor pressure compensation with Smart Pro Electronics 41 Installation requirements 41 Detector wiring 42 Initial settings and calibration requirements 42 Pressure compensation fine tuning 42 Internal heater kit for applications below 50 C 45 Index 46 iv FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Preface Table of figures Figure 1 System overview 6 Figure 2 Conduit and bracket mounting 11 Figure 3 Interconnect 13 Figure 4 Circuit board identification 29 Figure 5 CPU board and power supply board simplified component layout 30 Figure 6 LED indicators 32 Figure 7 Multiple detectors summation 38 Figure 8 Placement of multiple detectors 39 Figure 9 Vapor compensation system 41 Table of procedures Procedure 1 Cal Lo on Process 20 Procedure 2 Cal Hi on Process 21 Procedure 3 Calculating the calibration with Two Point Cal 22 Procedure 4 Collecting linearizer data 23 Procedure 5 Manually entering Cal Low and Cal High counts 24 Procedure 6 Entering and activating the linearizer curve 25 Procedure 7 Setup for a Simple Re Cal on
16. FiberFlex flexible detector is a scintillation material that produces light when exposed to radiation in proportion to the intensity of the radiation A photomultiplier tube detects the scintillator s light and converts them into voltage pulses which are amplified conditioned and sent to the microprocessor The microprocessor and associated electronics convert the pulses into a frequency output proportional to the amount of radiation striking the detector FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 7 Introduction Notes 8 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Installation Chapter 2 Installation Location considerations When the Ohmart level detector was ordered the source was sized for the optimal performance If the gauge is to be located other than as ordered notify Ohmart prior to installation Proper location of the level gauge can sometimes mean the difference between satisfactory and unsatisfactory operation Note Try to locate the source holder in such a place that it will not become coated with process material to ensure the continuing proper operation of the source ON OFF mechanism Many regulatory agencies for example the U S NRC require periodic testing of the ON OFF mechanism Refer to the Radiation Safety section that was shipped with the source holder and the appropriate current regulations for details Stable temperature Mount on a portion of the
17. HT SIGNAL PER LOCAL CODES HOUSING GROUND NOTES 1 AC VOLTAGE INPUT IS 115 VAC 10 AT 50 TO 60 Hz AT 15 WATTS WITHOUT HEATER OR 25 WATTS WITH OPTIONAL HEATER MAXIMUM POWER CONSUMPTION AC POWER IS TO BE SHARED WITH TRANSIENT PRODUCING LOADS USE AN INDIVIDUAL AC LIGHTING CIRCUIT SUPPLY A SEPARATE EARTH GROUND IF HEATER OPTION IS SELECTED VOLTAGE INPUT MUST BE 115 VAC 10 AT 50 TO 60 Hz DC VOLTAGE INPUT IS 20 60 VDC 24 VDC 10 FOR CE COMPLIANCE LESS THAN 100mV 1 1000Hz RIPPLE AT 10 VA MAXIMUM POWER CONSUMPTION DC POWER IS POLARITY INDEPENDENT POWER IS NOT TO BE SHARED WITH TRANSIENT PRODUCING LOADS SUPPLY A SEPARATE EARTH GROUND DC POWER ALLOWS USE OF SINGLE CABLE 4 WIRE HOOKUP 2 WIRES FOR POWER 2 FOR 4 20 mA FOR INDOOR OR CONDUIT USE CABLE NUMBER 236906 BELDEN NUMBER 9402 OR EQUIV FOR OUTDOOR USE IN CABLE TRAYS OR CL 1 DIV 2 HAZARDOUS AREAS USE CABLE NUMBER 236905 BELDEN NUMBER 1048A OR EQUIV 2 MAXIMUM LENGTH OF SHIELDED 2 CONDUCTOR 18 AWG CABLE IS 1000 M 3280 FT FOR INDOOR OR CONDUIT USE CABLE NUMBER 202676 BELDEN NUMBER 8760 OR EQUIVALENT FOR OUTDOOR USE IN CABLE TRAYS OR CL 1 DIV 2 HAZARDOUS AREAS USE CABLE NUMBER 202679 BELDEN NUMBER 9341 OR EQUIVALENT ALL WIRES SHOULD BE 18 AWG OR 20 AWG 3 MEASURE SIGNAL IS 0 TO 100 KHz MAXIMUM TRUE DIGITAL AND SATISFIES RS 422 AND RS 423 FOR SMART PRO CONNECT BLK WIRE TO TB 4 1 WHT WIRE
18. Low 27 Procedure 8 Performing a Simple Re Cal on Low 28 Procedure 9 Replacing the CPU or Power Supply board 34 Procedure 10 Returning eguipment for repair 35 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 v Preface Explanation of symbols The following symbols are used in this manual or on the instrument vi ZA Radiation notice In the manual information concerning radioactive materials or radiation safety information is found in the accompanying text Caution In the manual warnings concerning potential damage to the equipment or bodily harm are found in the accompanying text AC current or voltage On the instrument a terminal to which or from an alternating sine wave current or voltage may be applied or supplied DC current or voltage On the instrument a terminal to which or from which a direct current voltage may be applied or supplied Potentially hazardous voltages On the instrument a terminal on which potentially hazardous voltages exist FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Preface User s comments Ohmart values your opinion Please fill out this page so that we can continually improve our technical documentation Manual FiberFlex with Freguency Output User Manual v 1 0 Date Customer Order Number How we can contact you optional if you prefer to remain anonymous Name Title Company Address Did you find errors in t
19. M Billing address M Date needed M Method of shipment M Tax information 1 2 number 3 4 5 Note You must first contact Ohmart and receive a material return authorization number MRA before returning any eguipment to Ohmart Ohmart reserves the right to refuse any shipment not marked with the MRA number FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 35 Diagnostics and repair Notes 36 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Appendix Special applications Appendix I Special applications This chapter provides application specific information for special installations Multiple detectors summation page 38 Vapor pressure compensation with Smart Pro Electronics page 41 Internal heater kit for applications below 50C page 45 If your application is not listed here you may have been provided application specific information on the certified drawings The certified drawings are in the special information pocket in this manual If you have other application questions contact Ohmart Field Service in the U S or Canada at 513 272 0131 or your local rep outside of the U S or Canada FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 37 Appendix Special applications Multiple detectors summation Some applications require a measurement length longer than the maximum level detector length FiberFlex with frequency output LFXG F Smart Pr
20. Preface OHMART FiberFlex with frequency output Model LFXG F Continuous Level Applications version 1 0 Manual part number 241089 US amp Foreign Patents Pending FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 i Preface Revision history Manual version Revision description 1 0 Initial release Copyright 2000 Ohmart VEGA Corporation Cincinnati Ohio All rights reserved This document contains proprietary information of Ohmart VEGA Corporation It shall not be reproduced in whole or in part in any form without the expressed written permission of Ohmart VEGA Corporation The material in this document is provided for informational purposes and is subject to change without notice FiberFlex and OhmartView are trademarks of Ohmart VEGA Corporation US and Foreign Patent Pending HART is a registered trademark of The HART Communication Foundation Santoprene is a registered trademark of Advanced Elastomer Systems ISO 9001 approval by Lloyd s Register Quality Assurance Limited to the following Quality Management System Standards ISO 9001 1994 EN ISO 9001 1994 ANSI ASOC Q9001 1994 Approval Certificate No 107563 Ohmart VEGA Corporation 4241 Allendorf Drive Cincinnati Ohio 45209 1599 USA Voice 513 272 0131 FAX 513 272 0133 Web site www ohmartvega com Field service email fieldservice ohmartvega com Manual part number 241089 April 2000 Manual version 1
21. TO TB 4 2 SHIELD WIRE TO TB 4 3 FOR PROPAC CONNECT BLK WIRE TO TB 1 4 WHT WIRE TO TB 1 5 SHIELD WIRE TO TB 1 12 o o a 8 4 O O gt gt S T S sor al o o Z Z o o v D 3 5 lt lt LL LL lt lt 1 2 3 4 5 16 8 9 10 11 12 13 14 Figure 3 Interconnect FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 13 Installation Terminal Name 1 L1 2 L2 3 4 5 6 Freq output 7 Freg output 8 9 10 11 Aux 12 Aux 13 14 Power CAUTION Description AC power input AC power input Not used Not used Not used Measurement signal output Measurement signal output Not used Not used Not used Auxiliary input frequency signal Auxiliary input frequency signal Not used Not used DO NOT APPLY POWER until wiring is thoroughly checked The AC power source voltage input is 100 234 VAC at 50 to 60 Hz at 15 VA maximum power consumption AC power must not be shared with transient producing loads The DC power source voltage input is 20 60 VDC less than 100 mV 1 1000 Hz ripple at 15 VA maximum power consumption DC power cable can be part of a single cable 4 wire hookup or can be separate from output the signal cable See Output current loop section Switch for CE compliance For CE compliance install a power line switch no more than one meter from the operator cont
22. e Reconnect the terminal wiring connector Install the plastic electronics cover Put the housing cover back on Procedure 9 Replacing the CPU or Power Supply board 34 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Diagnostics and repair Reguesting field service To reguest field service within the U S and Canada call 513 272 0131 from 8 00 a m to 5 00 p m Monday through Friday For emergency service after hours call 513 272 0131 and follow the voice mail instructions Returning equipment for repair to Ohmart When calling Ohmart to arrange repair service be ready with the following information Product model that is being returned for repair Ohmart Customer Order C O Number Purchase order number for the repair service Returning eguipment for repair Call Ohmart Nuclear Products Repair 513 272 0131 8 00 a m to 5 00 p m Eastern U S time Monday through Friday Ohmart will assign the job a material return authorization MRA Please note Ohmart reserves the right to refuse any shipment that has not been assigned an MRA Indicate the MRA on the repair service purchase order Clearly mark the shipping package with the MRA number Send the confirming purchase order and the eguipment to Ohmart Corporation Attention Repair Department 4241 Allendorf Drive Cincinnati OH 45209 1599 USA Procedure 10 Returning eguipment for repair m M Description of the problem v m M Shipping address
23. e calibrate result in the EEPROM 5 This causes the Smart Pro to calculate a new gain based on the values you manually entered Procedure 5 Manually entering Cal Low and Cal High counts 24 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Finally the linearizer curve must be calculated and entered into the Smart Pro Entering and activating the linearizer curve 1 Call Ohmart Field Service 513 272 0131 or FAX Ohmart Field Service 513 272 4381 with the counts you obtained for the fill levels and recorded on the chart Be sure to provide Ohmart a FAX number or e mail address where you can receive linearizer curve data points Ohmart will use special software to calculate a linearizer curve from your data They will FAX you 41 data point values for your linearizer curve which you must enter into the Smart Pro Enter the 41 values on the Smart Pro screen 528 items 0 through 40 Item 0 will always have a value of 0 and item 40 will always have a value of 10 000 Make the curve active by entering a value 1 at screen 528 item 41 At screen 528 use the Auto Man button and Yes No button to increment and decrement the item number If a O is entered at item 41 the Smart Pro will not use the curve you just entered Save the results to the EEPROM On screen 102 RaM To EEPROM enter a 1 to upload to the EEPROM for permanent storage The error code on screen 102 should read 0 indicating t
24. ection M Turn the source holder shutter to the Off position MI Enter the password for Supervisor level access on screen 052 M Verify on screen 502 that the Smart Pro is receiving the frequency input from the level detector With a closed shutter the counts should be close to zero Cal Hi on Process 1 2 Be certain the correct Product Code has been selected From the main menu use the lt Select gt and lt Enter gt keys to progress through these screens CALIBRATE SYSTEM CALIBRATE GAGE SELECT CHANNEL CHOOSE CHANNEL 1 MORE CAL FUNCTIONS 1 TIME CAL Hi ON PROCESS On the caL Hi ON PROCESS screen press lt Enter gt to Start data collect The gauge will measure the sample and the Smart Pro will display collecting data When prompted enter the actual product level Save the results to the EEPROM On screen 102 RaM To EEPROM enter a 1 to upload to the EEPROM for permanent storage The error code on screen 102 should read 0 indicating the Smart Pro was successful in transferring the RAM data to the EEPROM Procedure 2 Cal Hi on Process FiberFlex with Freguency Output User Manual v1 0 firmware 1 0 21 Calibration Calculate calibration with Two Point Cal After the high and low density calibration data is collected the Smart Pro can make the calibration gain calculation Two Point Cal 1 From the CHANNEL 1 menu move through MORE CAL FUNCTIONS TWO POINT CAL 2 From the rwo point ca
25. emove the source holder lock If you are in doubt whether you are permitted to remove the source holder lock Don t If this gauge is to be installed in the U S and you are specifically licensed to remove the source holder lock you can get the combination from Ohmart Field Service Radiation Safety Be sure your license specifically states that you are allowed to perform this operation If this gauge is to be installed in the U S and if it was sold under a U S general license and you are not specifically licensed you are not permitted to remove the source holder lock If you re not sure if the gauge is a general license gauge check the source holder for the general license tag If it is not there it is not a general license device If the gauge is a general license device and you are not specifically licensed to remove the lock an Ohmart Field Service Engineer or other specifically licensed person must remove it for you FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 15 Installation Field service commissioning call checklist In many U S installations an Ohmart Field Service Engineer will commission the gauge To reduce service time and costs use this checklist to ensure the gauge is ready to be commissioned before the Field Service Engineer arrives M Mount the source holder and detector per the certified drawings found in the custom information folder in this manual VI Allow access for future maintena
26. he Smart Pro was successful in transferring the RAM data to the EEPROM Procedure 6 Entering and activating the linearizer curve FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 25 Calibration When a new initial calibration may be necessary Under most circumstances the initial calibration procedure need not be repeated The system will reguire only periodic re cal to compensate for drifts over time However certain events will necessitate a new initial calibration They are listed below e A new process application is being measured contact Ohmart for recommendation e A new measurement span is required by the process e A new measurement span setting has been entered into the software e A new radiation source holder is installed The level detector is moved to another location in U S only specifically licensed persons may relocate the gauge e Any change in the process vessel for example lining insulation agitator e Build up or erosion of vessel is excessive and cannot be compensated for with a re cal 26 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Periodic re cal Re cal adjusts the system by resetting one point of the calibration curve to an independently measured or known level Typically this is done on an empty vessel The freguency of re cal depends on several factors including the desired accuracy of the reading Smart Pro Note The Simple re cal l
27. his document for radiation safety information Unpacking the eguipment CAUTION Before unpacking the eguipment make sure you are familiar with radiation safety practices in accordance with your U S Agreement State U S NRC or your country s applicable regulations Unpack the unit in a clean dry area Inspect the shipment for completeness by checking against the packing slip and for damage during shipment or storage If the detector is included as a separate package in the shipment inspect the assembly for damage that may have occurred during shipment or storage If the unit was damaged during shipment file a claim against the carrier reporting the damage in detail Any claim on The Ohmart FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 1 Introduction Corporation for shortages errors in shipment etc must be made within 30 days of receipt of the shipment If you need to return the eguipment see the section Returning equipment for repair to Ohmart in the Diagnostics and repair chapter When the eguipment is unpacked inspect each source holder included in the shipment to assure that the operating handle is in the OFF position In the event the handle is found to be in the ON position place it in the OFF position immediately and secure it Note Most source holder models accept a lock If the source holder does accept a lock and there is no lock on it the lock is not secured you are unable to secu
28. his manual If so specify the error and page number Did you find this manual understandable usable and well organized Please make suggestions for improvement Was information you needed or would find helpful not in this manual Please specify Please send this page to Ohmart Corporation Director of Engineering 4241 Allendorf Drive Cincinnati OH 45209 1599 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 vii Preface This page is intentionally blank viii FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Introduction Chapter 1 introduction Nuclear materials notice This eguipment contains radioactive source material which emits gamma radiation a form of high energy electromagnetic radiation Only persons specifically licensed by the U S NRC or other regulating body may install dismantle relocate maintain repair and test the sourceholder portion of the eguipment Ohmart Field Service engineers are specifically licensed to install and commission nuclear gauges and can instruct you in the safe operation of your level gauge To contact Ohmart Field Service call 513 272 0131 Users outside the U S and Canada may contact their local representative for parts and service Note Special instructions concerning your source holder are found in an envelope that was shipped with the source holder and in the special information pocket in the back of this manual Please refer to t
29. iled information on the calibration process Be sure to follow the instructions for a level gauge as indicated on the flow chart in the beginning of the Mini Guide The span setting data collection of high and low samples and calculation of the two point calibration establish the endpoints of the calibration curve level vs raw counts on a graph The calibration curve is non linear due to the measurement method of radiation transmission The shape of the curve between the endpoints is determined by the linearizer Note When performing calibration or any other procedure that affects the output of the gauge be sure to disable the gauge from your distributed control system s automatic control Set process span The Smart Pro or Pro Pac calculates the process span based on the lowest Min Reading and the highest level Max Reading the level detector is expected to measure The low and high levels are entered in the Smart Pro setup menu 2 of 4 under the SET GAGE SPAN screen The Min Reading and Max Reading must be set correctly before beginning the calibration procedures FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 19 Calibration Cal Lo on Process Setting the low level for calibration reguires measurement with the level gauge of the empty vessel or lowest level This sets the low end sometimes referred to in the U S as zero of the calibration curve Before starting the cal low data collection
30. information see page 45 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 3 Introduction Typical applications Ohmart level gauges accurately indicate the level of liguids or bulk materials throughout a range on vessels reactors or tanks In order to achieve a level indication over the desired length it may be necessary to use more than one detector The manner in which these multiple detectors are linked together depends upon the types of detectors used Specific details on using multiple detectors are given in Appendix Special applications A wide range of industry operations profit from the accuracy of quality control systems using Ohmart nuclear level gauges A level gauge may be used in a number of applications such as the following Pulp and Paper e Liquors e Bleach plant chemicals e Coating chemical storage e Lime mud e Wastewater treatment tanks Chemical e Low pressure low vapor chemical storage e Settlers e Surge tanks Food and beverage e Food slurries e Pastes e Syrups e Dough level e Intermediate batch storage Water wastewater e Settling aeration tanks e Clarifiers e Sludge holding tanks e Wet wells 4 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Introduction Where to find help If you need help finding information check the Index and Table of Contents within this manual Ohmart Customer Service Ohmart Customer Service has Field Ser
31. lex with Frequency Output User Manual v1 0 firmware 1 0 41 Appendix Special applications Detector wiring The level detector freguency output is wired into the Smart Pro TB4 pins 1 amp 2 The density gauge output is wired into Smart Pro TB4 pins 5 amp 6 Initial settings and calibration requirements Note Setting up a pressure compensated level gauge system involves many application specific considerations Ohmart Field Service should be on site to set up the system To set up a system with vapor pressure compensation follow these general guidelines with the assistance of Ohmart Field Service 1 At the Ohmart factory the density gauge output channel will be set up to point to the temperature compensated raw counts location Set up and calibrate the level gauge as usual See the Calibration chapter of this manual for instructions After the level gauge is calibrated establish a known minimum pressure in the vessel At the Smart Pro access screen 521 item 14 This displays the counts from the density detector when the pressure is at a minimum Make note of the counts Access screen 529 item 109 Copy the counts value from the above step to item 109 This sets up the reference counts of the density detector Access screen 529 item 110 Enter an initial gain term value at this address Initially enter the value 1800 which is a gain of 1 8 You may need to adjust this value later to fine tune the system
32. nce M Make all wiring connections per the certified drawings and the Wiring the equipment section in this manual Tie in the wiring from the Smart Pro analog output to the DCS PLC chart recorder Ensure that the AC power to the detector and Smart Pro is a regulated transient free power source UPS type power is the best Note the equipment warranty will be voided if the equipment is damaged due to incorrect wiring not checked by the Ohmart Field Service Engineer M Have process ready for calibration When possible it is best to be able to completely fill and empty the vessel at the high and low levels for the initial calibration procedure and when possible at 10 increments in between for the linearization procedure M Do not remove the lock on the source holder Notify Ohmart Field Service if the lock has been damaged or if the lock is missing 16 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Chapter 3 Calibration Note This chapter discusses calibration with a Smart Pro or Smart Pro Pac If your FiberFlex LFXG F is used to output to a HART level transmitter refer to the HART level manual for calibration instructions Calibration is done with the Smart Pro or Smart Pro Pac the software in both operates identically Refer to the Smart Pro Reference for instructions to use the Smart Pro software To perform the calibration you must be familiar with the Smart Pro topics e Navigati
33. ng through the Smart Pro screens e Security access level e Product Code e Saving RAM to EEPROM permanent memory e Accessing 520 level screens and changing item values A summary of the calibration procedure for a standard level gauge is given here More detail is presented in the Smart Pro Reference and the Smart Pro Mini Guide to Fast Startups Smart Pro Note The instructions in this manual are compatible with Smart Pro firmware vx04 00 or later FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 17 Calibration Initial process calibration with Smart Pro Calibration establishes reference points which relate the detector output to actual values of the process Initial calibration is required before the gauge can make measurements of any accuracy Initial calibration must be performed after the gauge is installed and commissioned at the actual field site As long as certain critical process and equipment conditions remain the same see When a new initial calibration may be necessary on page 26 the initial calibration procedures will not need to be repeated The gauge will require only a periodic re calibration re cal which is a much simpler procedure Choosing the initial calibration method For each installation the user must choose one of two ways to calibrate the level detector The best calibration method depends on how the continuous level detector is to be used Read the following table to decide which
34. o gt Summed frequency output to Smart Pro Frequency output to last level detector FiberFlex with frequency output LFXG F Figure 7 Multiple detectors summation Special drawings from Ohmart Applications requiring multiple detectors summation are identified at the time of order The end user engineering contractor or both will have received certified drawings for the exact equipment ordered Refer to the drawings along with this section of the manual Note If the instructions on the drawings and this manual differ follow the drawing instructions They will be specific to your order 38 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Appendix l Special applications Installation requirements A multiple detector application consists of at least one detector that is capable of summing an input frequency e g model FiberFlex LFXG F or an LSF LJF or LNF Follow these installation guidelines e Install the summing detector at the top of the measurement range e Offset the detectors vertically so that the end of the top detector s active length corresponds to the beginning of the bottom detector s active length All detectors should be placed in the radiation beam _ O Q o db c 2s 0 oD oe eS 5 o Z O s o v o p wo 6 g Y 5 T TA T 8 ac O o 2 oo gt ka iio Figure 8 Placement of multiple detectors FiberFlex with Frequency Output User
35. ow method is presented in this manual because that is typically used for continuous level gauges Refer to the Smart Pro Reference Chapter 3 section Re Cal Channel 1 Category Il Functions for more information about choosing a method and performing the periodic re cal Setup of the Simple Re Cal Low establishes in the Smart Pro the default value of the level to be used for re cals Setup of Simple Re Cal Low 1 Know the value of the level in engineering units you will use for re calibration for example 0 0 inches 10 cm This level must be used each time a Simple Re Cal Low is done 2 From the main MENU 1 OF 2 use the lt Select gt and lt Enter gt keys to progress through these screens CALIBRATE SYSTEM CALIBRATE GAGE SELECT CHANNEL CHOOSE CHANNEL 1 More CAL FUNCTIONS 3 TIMES ENTER ABSORBER VALUE Low ABSORBER VALUE 3 On the Low ABSORBER screen 147 enter the new value of the low level condition and press lt Enter gt The screen will prompt Save Select Yes to save the new value 4 The Smart Pro will automatically save the results to the EEPROM When finished it will display Attempt completed Select Done to finish Procedure 7 Setup for a Simple Re Cal on Low FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 27 Calibration Simple Re Cal Low 1 2 Be certain the correct Product Code has been selected From the main menu use the lt Select gt and lt Enter gt keys
36. owing table for a summary of the LED indications aa ro rts Porc wz a Nor HAE A Z J Blinking 0 Off Figure 6 LED indicators Power Supply Board LED summary table LED Description Normal condition Error condition Recommendation 6V 6V DC voltage ON OFF Verify 5V on test level to Electronics are not receiving points electronics 6V DC voltage required for Check fuse on Power functioning Supply board Check power input terminals 1 2 24V Not used Relay Not used CPU Board LED summary table LED Description Normal condition Error condition Recommendation Mem Not used HART Not used ON n a CPU Central Blinks at rate of 1 time per LED doesn t blink CPU not Check power input processing unit second functioning Replace CPU board on CPU board heartbeat Aux Auxiliary input Blinks if auxiliary input present None Check auxiliary input frequency signal OFF if no auxiliary input wiring terminals 11 indicator present and 12 with a meter for frequency signal Check auxiliary input equipment HV Not used Field Radiation field Cycles in proportion to None A 1 mR hr indicator radiation field intensity at 2580nC kg hr field detector ON for 10 seconds for each mR hr then off for 2 seconds Can use LED 5 which blinks 1 time sec to time LED 9 for field indicator is usually reguired for a measurement Check for closed source shutter buildup insulation 32 FiberFlex with
37. prompt select Yes The Smart Pro will use the Cal Lo and Cal Hi datapoints to calculate the calibration 3 Save the results to the EEPROM On screen 102 RaM To EEPROM enter a 1 to upload to the EEPROM for permanent storage The error code on screen 102 should read 0 indicating the Smart Pro was successful in transferring the RAM data to the EEPROM Procedure 3 Calculating the calibration with Two Point Cal Note If you don t need a linearizer curve for the installation the calibration is complete You need not follow the next steps to create a linearizer curve 22 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Calibration Creating a linearizer curve optional To decide if you need to create a linearizer curve for the installation check the guidelines on page 18 Choosing the initial calibration method To create a linearizer curve you must take measurements with the gauge at intermediate levels between empty and full You will record the sensor counts at each level and call Ohmart with the data Ohmart will calculate a linearizer curve and provide you with the data to enter into the Smart Pro Typical fill points are 25 50 and 75 The more points measured the more accurate the linearization curve will be Collecting linearizer data 1 Nominal level 25 50 75 100 Fill the vessel to 25 or your first fill level Be sure you know the level as accurately as possible Acces
38. re then the gain term is too large Reduce the gain term screen 529 item 110 in increments of 100 until the level indication is the same as it was at minimum pressure With each change to the gain term be sure to allow time for the level measurement to stabilize e Ifthe level indication at maximum pressure is greater than at minimum pressure then the gain term is too small Increase the gain term screen 529 item 110 in increments of 100 until the level indication is the same as it was at minimum pressure With each change to the gain term be sure to allow time for the level measurement to stabilize When the gain term is set at a satisfactory value do an upload to the EEPROM to save the settings permanently If you need to disable the pressure compensation access screen 529 item 120 Enter a value of O at this address A value of 1 enables the pressure compensation FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 43 Appendix Special applications Smart Pro memory locations for pressure compensation The following memory locations are used by the Smart Pro in vessel pressure compensation applications only with the special firmware Description Smart Pro memory location Compensated raw counts Screen 520 item 7 Raw counts Screen 520 item 6 Density gauge counts Screen 521 item 14 Gain entered by user Screen 529 item 110 Reference density counts Screen 529 item 109 Enable 1 Disable
39. re the lock or the operating handle will not properly move into the off position call Ohmart Field Service immediately for further instructions 513 272 0131 Storing the eguipment Storing the source holder If it is necessary to store the source holder do so in a clean dry area Be sure the source holder shutter is in the OFF or CLOSED position Check with the current local regulations U S NRC Agreement State or other to determine if the area needs to be restricted in any way Storing the detector Avoid storage at temperatures below freezing Storage of the detector should be indoors in a temperature controlled area between 509 and 959 F 109 and 359 C and less than 50 relative humidity Eguipment must be stored in dry conditions until installation Do not store outdoors 2 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Introduction FiberFlex model LXFG F specifications System Accuracy Active Lengths Typical Sources Power Reguirements Signal Cable Flexible Detector GEN2000 Electronics Housing Weight Diagnostics 1 of span typical Flexible detector Cesium 137 Cobalt 60 AC DC Maximum length Material Bend radius Diameter Mounting 4 wire hookup with DC Certification to CSA and UL standards CENELEC certification Enclosure rating Ambient temperature Humidity Vibration Material Paint Housing and flexible detector LED indication Accuracy depends
40. rol station Conduit Conduit runs should be continuous and protection should be provided to prevent conduit condensed moisture from dripping into any of the housings or junction boxes This may be done by using sealant in the conduit or by arranging the runs so that they are below the entries to the housings and using weep holes where permitted A conduit seal off must be used in the proximity of the housing actual distance as required by local code when the location is in a hazardous area If only one conduit hub is used the other conduit hub must be plugged to prevent the entry of dirt and moisture 14 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Installation Commissioning the gauge Commissioning the gauge is the process of starting up the gauge taking appropriate radiation field tests checking the pre programmed setup parameters calibrating on process and verifying the working of the gauge Typically the gauge is commissioned by an Ohmart Field Service Engineer The source holder lock will be removed so that the gauge can take measurements in the field for the first time Only persons specifically licensed by the U S NRC Agreement State or other appropriate nuclear regulatory body may remove the source holder lock Note Users outside the U S must comply with the appropriate nuclear regulatory body regulations in matters pertaining to licensing and handling the equipment Can you r
41. s if one long detector was installed 40 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Appendix Special applications Vapor pressure compensation with Smart Pro Electronics Some applications with fluctuating vapor pressure require compensation of the level indication Due to the nature of measurement with radiation transmission an increase in vapor pressure causes a false higher indication and a decrease in vapor pressure causes a false lower indication Compensation is made with a density measurement of the vapor space with an Ohmart nuclear density gauge It monitors the vapor space density and sends its frequency output to the Smart Pro channel 2 The level measurement is input to Smart Pro channel 1 as usual Special firmware enables the vapor density effect to be eliminated in the final level indication density Smart Pro frequency output level frequency output Figure 9 Vapor compensation system Installation requirements The level detector is mounted as usual The density gauge must be mounted so that it is in the radiation beam but is above the highest expected level This ensures that the only process condition affecting the density gauge is the gaseous pressure change in the vessel The pressure compensation algorithm in special Smart Pro firmware makes use of the change in vapor pressure to determine the amount of compensation needed to correct the level indication FiberF
42. s screen 168 DATA CoLLecr on the Smart Pro Press lt Enter gt to begin the data collection A countdown timer will begin When the countdown reaches zero screen 168 will display the average counts for the data collection Record the average counts and the actual level in a table See below Repeat the procedure for each fill level including full or 100 Procedure 4 Collecting linearizer data Actual level Average counts FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 23 Calibration Note You may find that the counts for a full vessel are more than the counts using a closed shutter to simulate a full vessel This means the shutter blocks more of the radiation than the process does Or when the vessel is full some radiation beams over the process If this is the case you can manually enter the counts for a full vessel in the Smart Pro memory and have it re calculate the gain with the Two point calibrate function See the procedure below You must know how to access the 520 level screens and change items Manually entering Cal High and Cal Low counts optional see note above 1 Access screen 520 At item 40 enter the counts that represent 100 If you need to change the empty counts enter them at item 39 D TWT Access screen 152 CaL CHANNEL 1 and select Two Point Calibrate On screen 155 select Yes to indicate you have done a cal low and cal high On screen 157 select Yes to store th
43. tic discharge procedures Replacing a circuit board may be reguired if one of its components becomes damaged Before replacing a board check the troubleshooting flowcharts or call Ohmart Field Service to be sure a replacement is necessary FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 33 Diagnostics and repair Replacing the CPU or Power Supply board 1 OVO Say Ne na 10 11 12 13 14 Turn off power to the unit Remove the housing cover Remove the plastic electronics cover Remove the terminal wiring connector Remove the screws from the top hold down plate Carefully pull the two boards still attached to their mounting bracket out of the housing Be careful as you pull the CPU board out so that the ribbon cable that attaches to the sensor does not get damaged Once the boards are out remove the cable between the CPU and Power Supply boards Remove the appropriate board from its mounting bracket and replace it with a new board If the CPU board is being changed you must disconnect the sensor connector from the CPU board When the new CPU board is installed reconnect the sensor connector Reconnect the cable between the CPU and Power Supply boards Carefully place the circuit boards back into the housing Again be careful with the sensor cable on the CPU board Make sure this cable does not become damaged when reinstalling the boards Secure the brackets back to the hold down plat
44. vice Engineers located across the U S for on site service to U S and Canada In many cases a Field Service Engineer will be at your plant for the start up of your gauge In addition Field Service Engineers regularly assist customers over the telephone If you have a question or need help call Customer Service during office hours If your problem is an emergency for example line shut down because of Ohmart equipment you can reach us 24 hours a day Ohmart Phone 513 272 0131 Ohmart FAX 513 272 0133 Ohmart Field Service E mail Fieldservice ohmart com Ohmart also can provide field service for customers outside the U S and Canada In addition customers outside the U S and Canada may contact their local Ohmart representative for parts and service When calling with a question if possible please have the following information ready e Ohmart Customer Order C O Number located on the engraved label on the source holder e Sensor serial number located on the sensor housing inside the external housing FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 5 Introduction Principles of operation Ohmart s nuclear level gauges direct a narrow beam of radiation through the vessel to a radiation detector The beam is collimated shaped so that the entire active length of the detector is exposed to a radiation field The material in the vessel blocks the radiation in proportion to its level the higher level the more
45. w ones are introduced the gauge reading can be erroneous For example insulation that is added after calibration will absorb the radiation and cause the gauge to erroneously read upscale Slowly changing tank conditions due to material build up are compensated for with regular standardizations See the calibration chapter for information on standardization Avoid source cross talk When multiple adjacent pipes or vessels are equipped with nuclear gauges orientation of the source beams must be considered so that each detector senses radiation only from its appropriate source The best orientation is for the source holders to be on the inside with radiation beams pointing away from each other 10 FiberFlex with Frequency Output User Manual v1 0 firmware 1 0 Mounting the detector There are two types of mounting options The first type is the bracket mount The L bracket supports the electronics housing For this type of mounting the conduit clamps should be spaced every 24 inches The second type of mounting is the conduit mount This type of mount consists of an adapter with a 2 conduit coupler It provides an air hose fitting for applications that need to cool the detector The conduit mount reguires a user supplied nipple and conduit adapter union Shown below are the two mounting types Conduit Mounting 1 4 fitting for optional air hose I User s 1 2 13 12 mm 3 4 NPT 2 places
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