Emerson Transmitter 250 Operating Instructions
Contents
1. Effects of high vibration can be minimized early on by notifying the factory at time of order The electronics can be remote mounted and special insulators can be installed Please see the depiction below insulator for minimizing vibration sensor probe Figure 11 Insulator for high vibration 4 Remote Mount Electronics Option Due to process temperature vibration or accessibility the housing electronics of the LTM transmitter can be remote mounted as far as 25 ft The housing electronics are supplied with a pipe mount bracket that can be mounted most nearby posts or pipes with hose clamps The drawing below depicts a gage mounted transmitter in the top mount remote electronics configuration Figure 12 Gage mount transmitter in the top mount remote electronics configuration Y NEVER install the sensor probe inside an insulation blanket that may be around the level gage This will overheat the sensor probe and cause failure NEVER bend bow or cause a kink in the sensor probe this will damage the instrument and void the warranty Do not attempt to straighten the sensor probe this will not help the instrument work If the shipment arrives damaged please file a claim with the shipping company and contact the factory to arrange for a replacement There are a variety of ways to install a standalone transmitters i e crane lift etc the basic rule to remember when installing an LTM transmitter is D2. load the original factory settings or load settings saved in slots labeled Sensor 1 Sensor 2 or Sensor 3 if utilized by end user If desired one electronics module can save settings for 3 other sensor probes by calibrating the electronics module to a particular sensor probe then saving those settings into slots labeled sensor 1 2 or 3 Change the menu screen from load to save Then the user can save current setting into slots labeled sensor 1 2 or 3 and load from these slots as desired Loading Factory Defaults Enter into the Defaults menu by changing the no to a yes Then the option to Load will appear Press enter and the Factory option will appear then press enter on more time to execute the load from defaults settings can also be loaded from Sensor 1 2 or 3 by using the up or down arrows on the Factory screen if the user has utilized the other slots Saving Settings Enter into the Defaults menu by changing the no to a yes Then the option to Load will appear Use the up or down arrow to change the Load to Save option Press enter and the next menu will appear with Sensor 1 By pressing enter the current settings of the transmitter will be saved At the Sensor 1 menu screen if the up or down arrow is pressed the user has the option to save the transmitter settings into Sensor 2 or Sensor 3 slots Note One el
3. E mail magtech isemagtech com Website www isemagtech com 3902 Magnolia Rd Pearland Texas 77584 Phone 281 488 0788 oe g e Cc Fax 281 488 7080 LTM Series Models LTM 250 and LTM 350 Magnetostrictive Level Transmitters HART Instructions amp Operation Manual LTM 350_IOM Rev 5 03 11 Table of Contents Section E Wartantisaii is ld 1 LO Wa A A AA AAA AA EA E A E 1 Section 2 Transmitter OVervIOW ici icade pi 2 20 General Desi A ans 2 DA PLOGUCT IGS EIMIEAUI atra 2 2 2 Transmitter Congar rations iS a 2 23 Gace WIOURTCR ansiedad ie ei abad 3 ZA Standalone Transmitter a ads 3 Section 3 Transmitter Description srt 5 30 Detailed DESEO dE a 5 3 1 TECHNOIOLY TIME Oly OF OPE tioN aiii A 5 SECTION A IATA ATION cit dissed AR a ia 7 40 Gage MountinstalatON is A a 7 4 standalone Installation NAS 7 4 2 Generarlastallation Gude IMCS aia 7 4 3 Insulation against extreme heat cold sieren vio 10 Sections Feld VU INIING os 11 5 0 Recommended Toop WINS a 11 Sl Area Classification Installation SatetYacsn a a a a a A 13 Section 6 Transmitter Specifications iii ra 14 6 0 Haz td s tocations General Ratings adi EA dido 14 6 Electrical Spectator ia ais 14 6 2 Sensor Probe Specifications iia o A 14 Section 7 Men Structure and Features viviana ida dio i aa ai 15 7 0 PUSMDUTTON Operatoria da ca 15 A Mend Structure pi ii lidia 16 7 2 Features also exclusive features for models LTM 250 350 oooooocoonanccccnc
4. Minimum SU Separation Figure 5 Dual Output Transmitter A A dual output transmitter is also available in a gage mount configuration Consult factory for further details Section 3 Transmitter Description 3 0 Detailed Description The LTM Series is an assembly of two major components The Sensor Tube Assembly This is a 5 8 diameter stainless steel probe sealed on one end with the magnetostrictive waveguide in its center In addition to the magnetostrictive waveguide the tube also houses the optional temperature sensor and the sensing elements The tube is made to lengths of 2 30ft in rigid construction The Enclosure and Electronics The extruded aluminum housing has two compartments The enclosure is rated NEMA 4X and 7 One side contains the microprocessor board assembly and calibration push buttons The other side contains the field wiring termination board The electronics module is connected to the detector board of the sensor tube assembly via a plug in cable The electronics module houses printed circuit boards PCB that encompass surface mount component construction utilizing the latest integrated circuit technology that can be utilized Please contact factory for further details Magtech also has a stainless steel enclosure 3 1 Technology Theory of Operation The LTM 250 350 series level transmitters are based on the principle of magnetostriction first used for digital delay lines
5. was designed to get a critical application up and running A recalibration two point calibration may be highly desirable as soon as the opportunity presents itself Level Adjustment LvlAdjst If the level gage indicator and level transmitter reading do not match or appear to be incorrect by a few inches then the LvlAdjst function can be utilized Enter into the menu and simply use the up and down push buttons to enter the current level being displayed by the level gages visual indicator and then press enter The transmitter will adjust the calibration and output accordingly Note Be careful make sure this is what is desired 25 7 2 Features Exclusive to the LTM 250 350 models Field Reversible Transmitter FlipPrb An important and key feature of the LTM 250 and LTM 350 Models is the ability to flip rotate the entire transmitter 180 degrees This procedure is only for gage mount transmitters with an elbow connection on them If the transmitter does not have an elbow connection please contact factory for assistance If the need arises and a bottom mount transmitter is preferred over a top mount transmitter or vice versa then following these simple steps THIS PROCEDURE IS FOR GAGE MOUNT TRANSMITTERS ONLY 1 Physically flip rotate the entire transmitter this includes the sensor probe and mount it accordingly Be careful not to damage the sensor probe while rotating the transmitter 2 Remove the front glass cover of the
6. OR CIRCULATE CER PARTIRE Figure 14 HART Loop Topology Please visit www hartcomm2 org to learn more about HART Protocol 12 5 1 Area Classification Installation Safety A If the instrument is used as an explosion proof exp device then exp conduit must be sealed within 18 inches of the termination point at the instrument A Power must be supplied by an isolated supply A Caution To reduce the risk of ignition of hazardous atmospheres disconnect the device from the supply circuit or area must be known to be non hazardous before opening 13 Section Transmitter Specifications 6 6 1 Hazardous Locations General Ratings CSA and CSAUS Explosion Proof Class Div 1 or 2 Grps B C D Class Il Grps E F G Class III Tamb 40 C to 85 C 40 F to 185 F ATEX Ex d Sira 10ATEX1308X Ex d IIC T5 Gb Ex tb IIIC T100 C IP66 Db Tamb 40 C to 85 C 40 F to 185 F ce 0344 ES y 2GD IECEx Ex d IECEx SIR 10 0150X Ex d IIC T5 Gb Ex tb IIC T100 C IP66 Db Tamb 40 C to 85 C 40 F to 185 F 6 2 Electronic Specifications Supply Voltage 13 36 Vdc 13V 20mA Repeatability 005 of full scale or 010 whichever is greater Non Linearity 01 of full scale or 030 whichever is greater Sensor Accuracy 01 of full scale or 030 whichever is greater Damping 1 to 26 seconds Operating Temp 50 to 85 C 58 to 185 F Housing Explosion proof dual compartmen
7. and later precision distance or displacement in the machine tool industry This principle if designed and applied properly has potentially very high measurement resolution typically better than 0 001 inch In the machine tool industry such a high resolution is desirable In the level measurement application however a resolution of 0 03 inch is more than adequate In a brief description the magnetostrictive principle consists of a wire extruded and heat treated under carefully chosen conditions to retain desired magnetic properties which is pulsed by a circuit with a relatively high current pulse The high current pulse produces a circular magnetic field as it travels down the wire at the speed of sound Another magnetic field generated by a permanent magnet the float placed near or around the wire at some distance from the point of entry of this pulse interferes with the magnetic field of the current pulse and a torsional force results at the collision point Wovegude wire Torzlon Force Pulses Jo Pulse Sensing Elements Moonetc Float Figure 6 Principle of Operation The effect of this torsion force is a twist to the wire at this point producing torsion wave traveling towards both ends of the wire The propagation time or time of flight of this wave is measured precisely and if the wire properties remain stable it is very repeatable at about 5 10 microseconds per inch which is approximately the speed of sound
8. can potentially cause issues They are 1 Physical damage to the sensor probe Accidents can happen during the installation process and if the sensor is permanently bent bowed or kinked it will no longer work properly Some symptoms of damage to the sensor probe are a Erratic output unit jumping to full scale alarm mode randomly usually around the damage point b Unit in constant alarm condition Unit going into alarm condition after a certain point A If the unit arrives damaged please contact factory immediately 28 2 Water damage to the electronics module or sensor probe This is potentially the most severe case the symptoms are unpredictable If there is any suspicion that the transmitter may have incurred water damage please contact the factory to make arrangements to have the unit sent back for factory inspection A Physical and water damage are not covered under warranty 3 Magnetic Indentation It is possible for any magnetostrictive instrument to have residual magnetic energy stored along the length of the waveguide These magnetic anomalies can interfere with the output response signal If this appears to be the case a level gage float or a bar magnet preferably may be run along the length of the sensor tube past the head of the transmitter in an even motion without stopping This will usually clear all such magnetic anomalies A Never move a magnet in perpendicular motion away from the
9. in that medium By measuring the exact number of microseconds it took the torsion wave to reach a designated termination point of the wire the distance to the magnet from this termination point can be easily calculated A high speed microcontroller is utilized in the design to process and calculate the elapsed time measurement Accurate crystals are used for the time based to resolve sub microsecond timing increments The binary number equivalent to the microseconds of the echo travel time is used to calculate the distance of the float and a corresponding digital signal is output A basic block diagram describing the operation is shown below PREAMP WG DRIVE Figure 7 Basic Transmitter Block Diagram Calibration routines are included in the software to the 0 and 100 points for any distance desired Even reverse calibration is a simple task using the software routines Reverse calibration is desirable if ullage instead of level is required or when the probe is installed with bottom mount electronics The LTM 350 transmitter has four output configurations HH a gt Configuration options must be chosen at quoting stage 1 Primary Level The most basic version of this transmitter is that it computes the distance between the float and the detector from the elapsed time measurement A specific interrogation pulse is applied to the waveguide Any feedback signal received before and after this window is rejected as noi
10. select lower range value Most of the time this value is at 0 00in It is recommended to leave this value at zero and press enter 4 The next menu is Sel URV or select upper range value Enter in the desired measuring range and press enter 5 The Energy menu is next This parameter controls the amount of energy being sent down the sensor probe Longer sensor probes require more energy shorter sensor probes require less energy Please contact the factory for guidance with this parameter 6 The DCOffset menu is the signal to noise ration Please contact the factory for guidance with this parameter 7 The HoldTime menu is the amount of time the energy being sent down the probe is sustained Note a longer hold time can increase the deadband near the electronics Please contact the factory for guidance with this parameter 8 The last menu is the CrntLvl or current level menu Enter the known current level in the vessel tank in engineering units and press enter The calibration should take place and the transmitter should be operational If the next menu appears then the operation was successful If the menu reverts back to the beginning of the 1pt Cal menu then the operation was unsuccessful Further troubleshooting may be necessary if the operation is unsuccessful See Section 8 for troubleshooting guide gt The 1 point calibration may not be within the published accuracy specification Again this procedure
11. sensor tube This will always leave a residual magnetic field in the waveguide which causes the transmitter output to be erroneous or unstable The LTM 350 is HART compatible however HART communication will not work if the unit is not powering up 8 2 Power Supply Troubleshooting The LTM 250 350 is designed to operate with a supply voltage of 13 36 Vdc minimum 13V 20mA across its terminal without affecting the analog current output The most common supply voltage used is 24Vdc At times additional resistance in the loop is necessary either in the form of a second load resistor or higher resistance safety barrier This will appear to limit the maximum output of the transmitter to below 20mA The transmitter will perform correctly up to a certain point To resolve this problem the voltage of the loop supply must be increased Even a slight adjustment of 1Vdc may be sufficient All connections must be checked for improper wiring or polarity before power is applied LTM Series transmitters are polarity protected 8 3 General Troubleshooting Below are some troubleshooting procedures for the LTM transmitters that have been established overtime Symptom Transmitter is not powering up The LCD is not turning on Resolutions 1 Make sure power is applied correctly meaning plus and minus are not reversed The transmitter is polarity protected 2 Make sure the electronics module is seated properly Open t
12. stand alone unit is designed to travel up the sensor tube with the change in fluid level If build up of process or contaminates should restrict the movement of the float the transmitter sensor tube will have to be cleaned or the float may have to be replaced with one that has a larger inside diameter The floats are designed to match the pressure and specific gravity for the process being measured and come in various materials ranging from stainless to kynar The magnetic float can be changed out at any time to accommodate the processes being measured The float stop located at the bottom of the transmitters can be removed to allow the float to slide off the sensor tube 4 2 General Installation Guidelines The basic steps to installing the LTMs are 1 Inspection of equipment Inspect the parts that are listed on the packing slip Make sure nothing appears to be damaged such as a broken glass from the level indicator assembly flippers damaged float or a damaged transmitter Please file a claim with the shipping company immediately if it is believed the shipment has arrived damaged and be prepared to provide pictures A The sensor probe of the transmitter SHOULD NOT BE BENT BOWED OR KINKED in any way or the transmitter will not work will most likely go into fail mode The following is a depiction of damaged probes Figure 8 All damaged sensor probes 2 Identify Proper Orientation of Transmitter There are a f
13. transmitter enclosure and then using needle nose pliers pull on the protection screws snake eye screws to pull out the electronics module Alternate pulling on the screws in order to prevent damage to the electronics module 3 Rotate the electronics 180 degrees module and insert it back into the enclosure The module should now be right side up A Do not twist or rotate the transmitter housing to adjust the conduit entry The conduit entry must be left in the opposite position 4 Thereisa special configuration menu that is utilized to achieve this task To access this menu press and hold the increment T button then while holding the increment button press and hold the enter button for 3 seconds 5 The FlipPrb Flip Probe menu should appear Use the up or down buttons to select Yes if rotating the sensor is what is desired else select no and exit the menu 6 When Yes is selected the next menu is the Config Configuration Orientation menu This is where the Top or Bottom mount configuration is selected This configuration orientation is with reference to where the sensor probe bulkhead is located on top or bottom Select the appropriate Config and press enter If the original orientation is selection the menu will revert back to FlipPrb menu 7 The next menu is Rerange Change Range menu Select Yes if the measuring range or span is changing from t
14. Cal gt gt gt Sellngth gt gt gt Sel LRV gt gt gt Sel URV gt gt gt Energy gt gt gt DCOffset gt gt gt HoldTime gt gt gt CrntLvl gt gt gt CrntLvl Yes gt No yes 30 00in 0 00in 24 00in 22 1 50V 4 us 0 00in Busy V LvlAdjst gt gt gt CrntLvl gt gt gt CrntLvl Yes gt No yes 0 00in Busy V FlipPrb gt gt gt Config gt gt gt ReRange gt gt gt Sel LRV gt gt gt Sel URV gt gt gt CrntLvl gt gt gt CrntLvl Yes gt No yes Bottom gt Top Yes gt No yes 0 00in 24 00in 0 00in Busy no gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt V ChgSgnl gt gt gt Energy gt gt gt DCOffset gt gt gt HoldTime Yes gt No yes 22 1 50V 4 us V PW Filter gt gt gt PW Min gt gt gt PW Max On gt Off On 40 tics 100 tics V Exit Yes gt No 23 7 2 Features Exclusive to the LTM 250 350 models This section describes the advance menus in detail ComPort This menu is currently only utilized at the factory and will not assist in any troubleshooting When the menu first appears the No option is defaulted simply press enter to bypass this option If Yes is selected and this menu is accidently entered into then the push buttons will be locked out Simply cycle the power to the instrument to clear the effect of entering into this option Default The next menu is the Default Configurations menu This option allows the user to
15. M Series to a mag gage The transmitters may be calibrated for the same range as the visual indicator on the mag gage or for part of the range depending on the application 100 Fo gt Magtech transmitters may also be used in conjunction with other manufacturers magnetic level gages Full warranties will apply upon factory approval Float and or Indicator replacement may be required 2 4 Standalone Transmitter When a magnetic level gage is not present the LTM can be inserted into the tank vessel with its own float mounted around the sensor tube The depictions below show the standalone version of the LTM Series with various process connections and the standard float stop with centering ring Figure 3 Transmitters with various process connections In Figure 3 Transmitter A depicts a standard compression fitting that is on all standalone transmitters Transmitter B depicts a compression fitting and a hex plug This option is highly recommended because the hex plug is selected based on the float s diameter OD so if the instrument ever needs to be removed or serviced for any reason it can be removed by the hex plug Transmitter C depicts a flanged option with a compression fitting and a hex plug A stilling well may be used along with the transmitter inside the tank Stilling well is a pipe external to the sensor probe and float encasing the entire assembly protecting it from surface agitati
16. O NOT DAMAGE the sensor probe this will void the warranty If damage is suspected please contact the factory and be prepared to provide pictures gt In REMOTE MOUNT electronic options please support the sensor probe at the elbow condulet and then every 3 feet depending on length of cable Support at every 2 feet may be required if explosion proof conduit is utilized by the end user 4 3 Insulation against extreme heat cold Magtech strongly recommends that an experienced Magtech Technician do insulation of the magnetic level gages at the factory with externally mounted transmitters A If Cryogenic Hard Skin cold service type insulation is required it must be done at the factory due to the custom TUBE in TUBE design necessary for removal of the transmitter if needed If insulation is going to be done in the field then the following guidelines MUST be followed 1 Flexible type insulation jackets NOT HARD SKIN are required and must be installed around the mag gage chamber only DO NOT cover the LTM sensor tube as this may burn up the sensor and possibly the electronics After the insulation jacket is installed the LTM sensor tube must be remounted at its factory preset distance from the mag gage chamber and must be parallel to the chamber as well small cut outs in the jacket are required to re attach the transmitter properly Make sure that the 0 and 100 4 20mA marking on the sens
17. Y The end user specified tag number only when specified 2 2 Transmitter Configurations LTM Series transmitters generally have two configurations 1 Gage Mounted Where the transmitter is mounted on the outside of a magnetic level gage and strategically located within a certain longitudinal distance from the transmitter sensor probe and a magnetic float is placed inside the level gage 2 Standalone or Direction Insertion Type Where the transmitter has a magnetic float directly around the transmitter sensor probe and the probe is directly inserted into a tank vessel In either configuration as the tank level changes the float tracks the change and continuously activates the sensor probe The electronics process the change in signal and output an analog and or digital signal This output is precisely the liquid level in the tank A Magtech is always willing to explore unique applications that require their own distinctive configurations Please consult the factory for guidance 2 3 Gage Mounted Transmitter The LTM Series may be strapped to the outside of the Magtech LG series magnetic level gage In such an installation it is used as an accessory transmitter for the visual level gage The same float used to activate the magnetic gage is also used to activate the magnetostrictive sensor of the LTM and transmit a directly proportional 4 20mA signal The depiction below shows the gage mount installation of the LT
18. age then remove 4 20mA or 0 100 stickers from the sensor probe Call factory with serial number and desired process connections 3 4 mnpt 2 mnpt hex plug flanges etc Converting from standalone to gage mount Remove the transmitter from the vessel then remove process connections and float Call factory with serial number of transmitter and the level gage to which the transmitter is to be mounted A Always be careful not to damage the sensor probe when removing installing the transmitter to from the gage or vessel 27 Section Transmitter Calibration and 8 LTM Troubleshooting 8 0 Calibration A There really is no need to re calibrate this instrument The LTM Series arrive calibrated to specified measuring ranges at order placement If the need arises and a recalibration is deemed necessary please follow these instructions carefully L A Level simulation will be required at 0 and 100 positions 1 Verify the probe length is not the same as the measuring range desired If so please change accordingly See Sections 2 1 and 7 1 2 Go to the Change Range menu and set the desired URV measuring range Go to the Trim Sensor menu and enter 4 Atthe Trim Zero screen place the level or magnet float at 0 4mA point and then press enter 5 Atthe Trim Span screen place the level or magnet float at 100 20mA point and then press enter 6 Exit the c
19. allation 4 4 0 Gage Mount Installation The LTM Series can be mounted to the side of a Magtech LG series level gage using special mounting brackets and stainless steel hose clamps When mounting the transmitter to an LG series gage the active sensor region of the probe should fall within the centerline of the process connections on the gage If the transmitter s deadband region is inside the centerline of the process connections the transmitter will not output an accurate measurement because the active region of the probe is too short When placing an order for a transmitter to accompany an existing gage it is important to indicate the style of the gage the temperature and the center to center dimension Calibration of the probe is factory set to the center to center dimensions provided however a re ranging may have to be performed to match the probe to the desired control room specifications See Section 7 1 Change Range for more details 4 1 Standalone Installation The LTM Series standalone transmitter comes equipped with a mnpt compression fitting mounted approximately 3 to 6 inches below the electronics housing The fitting is placed in this area to ensure the transmitter is calibrated in the sensor tubes active region Refer to the standalone drawings for a visual description of the transmitter features Optional configurations are available upon request 2 mnpt flanges etc The magnetic float used in the
20. ange Value LRV This is the 4 00mA 0 00 point on the senor This value should only be incremented For example if the value is changed from 0 00in to 3 00in the 4 00mA point will shift 3 00 inches higher than the original point It is recommended to leave this at 0 00 most of the time unless a special circumstance arises Press enter to go the next screen Select Upper Range Value URV This is the 20 00mA 100 00 point on the sensor This value should only be decremented Changing this parameter will change the measuring range or span of the transmitter Select Damping This parameter is used to slow down the reaction of the instrument in order to ignore or average out any agitation on the process surface that may be causing an unsteady output The units are fixed in seconds and values can be from 1 to 26 seconds LCD Menu examples S e l P V Lev e l S e IAI arm Fail Hi gh C hg R nge N o S e L R V 0 00 i n S e U R V 2 0 0 O i n Se Dam p 1 S 19 7 1 Menu Structure Continued Description Rate of Change RoC Filter This parameter helps ignore erroneous readings from the transmitter s surroundings If the user knows how fast the level can change in the vessel i e inches per second then this parameter should be set at a rate that the level in the vessel cannot suddenly jump to See section 7 2 Features for more details Trim Sensor This menu can be used to recal
21. ccncnnnnnnnnnnononnnannnnccnocononocanininnnnnns 22 Table of Contents Section 8 Transmitter Calibration and TroubleShoOoting csscssccsccssccsscssccsccescesscsccescsscesscescoessesseesoessesses 28 e CP o pr O OO 28 AN e E E e 28 3 2 POWer Supply Troubleshooting estes 29 a General TOUDE snoot odo isis 29 Section 9 LIM 350 has HART Protocol sirios ii 30 9 0 HART Protocol General Information Flowchart of HART MenuS oocccccnnncccnoneconononcccnononacononacinononeninnnnnanons 30 Icon Key A Warning Caution Valuable Operation Information Important Information to Know Read Carefully these Tips are the DON Ts of the instrument Section 1 Warranty 1 0 Warranty All Magtech products are warranted against defects in materials and workmanship for a period of no less than one year from the date of shipment The level gage chamber and process connections are guaranteed for the life of the tank or vessel to which it is attached Floats are guaranteed for two years Magtech will repair or replace at its discretion those products that fail to perform as specified with the following exceptions 1 Products repaired or modified by persons that are not authorized by Magtech 2 Products subjected to misuse negligence or accidents 3 Products that are connected installed or otherwise used in such a way not in strict accordance with manufacturer s instructions This warranty is in lieu of any other war
22. e configured Select Length Note THIS IS NOT THE MEASURING RANGE This parameter should only reflect the overall sensor length It can be adjusted by incrementing and decrementing the value and then pressing enter Level Units This menu can be used to change the level engineering units It can be changed by incrementing decrementing to one of the following units in ft mm cm m and then pressing enter Temperature Units This menu can be used to change the temperature engineering units It can be changed by incrementing decrementing to one of the following units F C R K and then pressing enter gt This menu only appears if the temperature option is provided LCD Menu example S W Rev 1 0 0 0 0 H W Rev 1 0 0 0 0 Dis pla y Sa rol S el Ln gt h 3 0 0 O i n Lv I U n it s i n T e m p U n itt 18 7 1 Menu Structure Continued Description Select PV This menu allows the user to select the measurement that controls the transmitter s current output mA gt This menu only appears if the interface 2 floats option is provided Select Alarm The following alarm settings can be chosen FailHigh 21 00mA Faillow 3 50mA HoldOut holds last good reading until transmitter recovers Change Range This menu allows the user to change the measuring range or span Enter the menu by changing the No to a Yes and press enter Select Lower R
23. ectronics module can potentially hold up to 3 other transmitter settings The factory settings can never be overwritten or saved to only loaded from Deadzone This menu is mainly utilized at the factory to achieve optimal linearity near the deadband close to the electronics This feature was released just in case in field adjustments are necessary This option feature only appears in software revisions 1 01 15 or higher 24 7 2 Features Exclusive to the LTM 250 350 models Please consult factory before attempting this procedure Document transmitter s serial number for better assistance 1 point Calibration Procedure 1pt Cal The following menu is the 1 point Calibration procedure This procedure was designed to help the user get up and running in an emergency If electronics have to be shared in an emergency the following procedure guides the user through a quick calibration procedure that does not require level simulation but instead works with the current level 1 point in the vessel tank 1 Enter into the 1pt Cal menu by changing the no to a yes and pressing enter 2 The first menu is SelLngth or select length This is not the measuring range but the overall probe length This information can be found on the label of the instrument housing See Section 2 1 Product Identification Enter the value in using the up or down arrows and press enter 3 The second menu is Sel LRV or
24. el gt Intrface gt Temp gt mAOut gt Range SelLngth 30 00 in Lvl Unit in gt ft gt mm gt cm gt m Temp Unit C gt F gt R gt K Sel PV Level gt Interface Sel Alrm FailHigh gt Faillow gt HoldOut ChgRnge gt gt gt Sel LRV gt gt gt Sel URV Yes gt No yes 0 00 in 24 00 in SelDamp 1 sec ROC Fitr 10 0in s TrmSnsr gt gt gt TrimZero gt gt gt TrimZero gt gt gt TrimSpan gt gt gt Yes gt No yes Busy 24 00in Offset 0 00in TrimDAC gt gt gt Trim 4mA gt gt gt Trim20mA Yes gt No yes 120 3860 TstLoop gt gt gt LoopTest Yes gt No yes 4 00 mA Exit Yes gt No Only applies when Interface Float is included di Only applies when Temperature Sensor is included TrimSpan gt gt gt Busy Span Error if incorrect 17 7 1 Menu Structure Continued Description Manufacturer and Model Software Revision Status This is the current software revision Hardware Revision Status This is the current hardware revision Scrolling Option Allows the user to stop the main menu from scrolling and choose 1 of 5 possible parameters Engineering Units level interface and temp Current mA or Percentage Select the desired parameter and then press enter Scroll is the default parameter this option keep the main menu scrolling See section 7 2 Features for more details Interface and Temperature options only appear if the option s ar
25. ew possible orientations of the LTM Series transmitters they are B Figure 9 Possible transmitter configurations Transmitter A is a standard top mount configuration Transmitter B is a top mount with elbow usually utilized when there are temperature or head room issues There is also a bottom mount with elbow configuration which is not depicted Transmitter C is a bottom mount transmitter with remote electronics This configuration is utilized in more extreme temperatures or for accessibility There is also top mount with remote electronics which is not depicted 3 Mounting the Transmitter Align the 4 20 mA or O and 100 markings with the center of the top and bottom process connection Mount the transmitter along the level gage and use a nut driver to tighten the clamps so the sensor probe of the transmitter is held securely will not slip up and down Keep the transmitter supported while the clamps are being tightened this can require more than one person Do not over tighten the clamps because they will bend and distort rN O 0 A Correct B Incorrect C Incorrect Figure 10 Top view of mounting clamps and sensor probe A Is the correct way to have clamps tightened gt The clamps do not have to meet B Is incorrect because the clamp is flipped around and will not grip the sensor probe C Is incorrect because the clamp has been tighten too much and damaged distorted
26. he front cover where the LCD is and firmly push on the Magtech text A good way to tell if the electronics are not seated properly is by making sure the protection screws are not physically higher than the outside of the housing Sometimes pulling the electronics module out and putting it back in can reseat the electronics correctly Use cutters or needle nose pliers to grip the protection screw and lightly pull on each screw alternate 29 LTM 350 has HART Protocol The LTM 350 is a HART registered and certified instrument The section presents how the HART Communication Protocol has been utilized in the LTM 350 This section does not explain what HART Protocol is please visit www hartcomm2 org to learn about HART The following is a flow chart of our HART menu structure This flow chart can be utilized to access desired parameters and operations when using a handheld communicator or a HART enabled host system HART Menu Flowchart for LTM350 Transmitter E 30 A A A A A A A A eS Note 1 When Interf is PV Interf is displayed Note 2 Only applies when interface float is included Note 3 Only applies when temperature sensor is included Note 4 Value displays 0 if interface float temperature sensor is not present 32
27. he original span Select No if the span is to able to remain the same Selecting Yes will then go through change range procedure discussed in section 7 1 of this manual 8 After the Rerange menu is the CrntLvl current level menu Simply enter where the existing level is in the vessel and a one point calibration will take place automatically and the next menu will appear If the next menu appears then the operation was successful If the menu reverts back to the beginning of the FlipPrb menu then the operation was unsuccessful Further troubleshooting may be necessary if the operation is unsuccessful See Section 8 for troubleshooting guide 26 7 2 Features Exclusive to the LTM 250 350 models Change Signal ChngSgnl The next and final menu in the special features menu is ChngSgnl or change signal option The feature allows the adjustment of the signal being sent down the sensor probe It can be utilized when one electronics module is being utilized to save settings for various different length sensor probes This menu has 3 parameters that can be adjusted The first is Energy it is increased for a longer sensor probe and decreased for a shorter sensor probe The second parameter is DCOffset or DC Offset v this parameter is decreased for longer sensor probes and increased for shorter sensor probes The third and final parameter is the HoldTime or hold time us this parameter reco
28. ibrate the transmitter A There is no need to recalibrate the instrument simply use the Change Range menu and change the LRV and URV as desired A If the need arises to use this menu then level simulation will be required at O and 100 percent Offset This parameter simply adds a digital value to the measuring range or span it does NOT shift or move the measuring range See section 7 2 Features for more details The span will not change and the 4 20mA will not shift from its original calibrated points This value also affects the reading for interface level when available LCD Menus examples R o 1 T r O f C F 0 0 i m S n f s e 0 0 t n S r s r N o i n 20 7 1 Menu Structure Continued Description Trim Digital Analog Converter DAC These are factory set parameters used to provide an accurate 4 000mA and 20 000mA This parameter should not be changed as Magtech uses NIST traceable equipment to calibrate our transmitters and only accredited laboratories for the annual calibration of our equipment This menu will allow the user to change the accuracy of the transmitter output A Current meter should be used to monitor the 4 20mA when this function is selected Test Loop This function allows for direct control of the Transmitter s current output mA capability Simply enter into this menu and change the current mA output as desired This opt
29. ion is excellent for plant startup verification Exit This signifies the last menu before the main screen If the user desires go back through the configuration menus then change the Yes to No and review the configuration again else press enter while the screen shows Yes and return to the main screen LCD Menu examples T rim D A C N o s t Loop N o 21 7 2 Features This section will describe in more detail some of the LCD Menus and new features exclusive to models LTM 250 350 Scrolling Option When choosing not to scroll the main menu the following options can be chosen by pressing the up and down push buttons exclusively for models LTM 250 350 1 Display Display Display Display Display Display Scroll or Level or Intrface or Temp or mA Out or Range The Scroll option will vary depending on how many outputs are configured Rate of Change RoC Filter The RoC filter is a continuous monitor of how fast the rate the level is rising and falling It is also an excellent tool to help eliminate any temporary spontaneous noise that may be present in field For example if the level in a tank cannot rise or fall faster than 30 0 in s then the setting for the RoC filter should be set to 15 0 in s or less to help filter ignore erroneous readings Note The engineering units will change according to units selected i e cm s exclusively for models LTM 250 350 Offset The
30. mmended to stay within a certain range There is purposely not much detail on this option as it is recommended that these parameters not be changed unless the electronics module is being utilized for more than one sensor probe It is also recommended that the user be guided by the factory if this option is being utilized A This option is also intended for mainly factory use Changing these parameters can cause undesirable results Please consult factory with any questions The factory default configurations can be loaded if the parameters have been drastically changed Pulse Width Filter PW Filtr The pulse width filter can be utilized for dual output level and interface applications if there are any erroneous readings being transmitted or displayed This feature can be adjusted so the unique signal from the magnetic float can be concentrated on and all other false signals are ignored This option feature only appears in software revisions 1 01 15 or higher Conversion from Gage Mount to Standalone When converting from a gage mount transmitter to a standalone transmitter or vice versa simply contact the factory to order appropriate parts Please have the serial number of the transmitter documented so the factory can make traceable record changes and offer better assistance Most conversions can now be done in field with minor configurations and calibration Converting from gage mount to standalone Remove the transmitter from the g
31. nsmitter Overview 2 0 General Description The LTM Series are 2 wire electronic field instruments suitable for installation in hazardous and non hazardous locations Testing and certification has been obtained from different agencies for installation in such areas This instrument is designed to measure and transmit an analog and or digital signal proportional to liquid level in a tank The complete assembly includes an explosion proof enclosure and attached sensor tube and a magnetic float The LTM Series are available in a variety of lengths and wetted materials to accommodate many different applications 2 1 Product Identification WWWWWWWWWWWWWWWWWWWWWWW 22 22 S N AAAA OL BBBB MODEL LTM 350 G XXXX TAG YYYY ISE MAGTECH WWWWWWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWWWWWWWW Figure 1 Example label name plate The product can be identified by the stainless steel label that is located on the side of the transmitter enclosure housing The label can be read as follows wwww Any hazardous location area classification markings that the instrument is approved for ZZ ZZ Born on date the2 digit month and 2 digit year the instrument was shipped to the customer AAAA The specific serial number assigned by Magtech for complete traceability BBBB The overall probe length of the instrument Note THIS IS NOT THE MEASURING RANGE XXXX The measuring range of the instrument The O and 100 4 20mA output range YYY
32. offset is a digital number that gets added to both the LRV and URV to account for any distance below the sensor probes measuring distance For example if the offset is changed from 0 00in to 2 00in the Level on the main screen will show 2 00in at 4 00mA and the 20 00mA value will simply have 2 00 inches added to it he gt value will also add to the interface level when available The span will not change and the 4 20mA will not shift from its original calibrated points This offset 22 7 2 Features Exclusive to the LTM 250 350 models 4 There is an advance menu incorporated into the LTM 250 350 models To access this menu press and hold the increment T button first then while holding the increment button press and hold the enter button for 3 seconds Anew menu will appear on the LCD screen The following is a flow chart of the advanced menus ComPort gt gt gt Serial Yes gt No yes Active V Default gt gt gt Default gt gt gt Select gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt Defaults Yes gt No yes Load gt Save Load Factory gt Sensor1 gt Sensor2 gt Sensor 3 Loaded gt gt gt Select gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt Defaults Save Sensor1 gt Sensor2 gt Sensor3 Saved V Deadzone 1 50in V 1pt
33. on or from physical damage due to the length of the sensor probe A depiction of a transmitter with a stilling well is provided below 34 mnpt compression fitting Male npt Hex Plug Flange connection Stilling Well Float Selected Designed to fit in stilling well and float on process Float Stop wath stilling ing When a stilling well is used care should be exercised when installing the tube to center it in the chamber so that the float can freely travel the entire length of the probe Stilling wells are required for transmitters over 10 feet or the instrument cannot be considered under warranty Optional Features that are available with the LTM 350 but NOT the LTM 250 are 1 HART Protocol which enables a Asecond digital output proportional to an interface level requires a second float of different specific gravity b A digital temperature output that reflects the liquid temperature c Advanced diagnostics and features highly beneficial for commissioning troubleshooting or monitoring Up to two floats may be used with the LTM 350 only The second float will typically sense the interface level the heavier of the two fluids in the tank The specific gravity of the second float will be such that it can be totally immersed in the lighter fluid The drawing below shows a transmitter with dual floats one for total level and the other for interface level also available with various process connections
34. on the left 2 pins on the right M t h 3902 Magnolia Rd a g e CG Pearland Texas 77584 Division of SE of Texas Inc Phone 267 400 0760 A E a TITLE DE SCRIPTION LTM Electronles Module Front Panel THIS DRAVANG CONTAINS PROPRIETARY INFORMATION DRAWING NUMBER PLEA SE DO NOT DUPLICATE OR CIRCULATE 1803239 Figure 15 Front Panel of Electronics Module 15 7 1 Menu Structure Main Screen scrolling The menu structure has been designed so the end user can make parameter changes relatively fast and easy Below is a detailed description of these menus The LTM 250 350 LCD is a 2x8 character screen The main screen scrolls between the following parameters Level in selected engineering units Interface when option is provided in selected engineering units LTM 350 only Temperature when option is provided in selected engineering units LTM 350 only The analog current corresponding to level in mA Percent of range corresponding to level in O ee If the user desires to enter into the configuration menus simply press hold the enter button for 2 seconds gt Make sure the electronics are not in write protect mode The menu order can change and new menus can be introduced based on transmitter output options and hardware or software revisions 16 The following is the LTM 250 350 LCD Menu Flowchart Magtech Magtech LTM 250 or LTM 350 SW Rev 1 00 00 HW Rev 1 00 00 Display Scroll gt Lev
35. onfiguration menus and the instrument should be calibrated If not begin to troubleshoot or consult factory for assistance 9 Error Preventative Calibration The LTM 250 350 transmitters are protected from incorrect calibration so if something is done incorrectly it will display Span Error on the LCD for 5 seconds and then return to the beginning of the Trim Sensor menu Recommendation Again there is no need to recalibrate the instrument simply go to the Change Range menu and adjust the LRV or URV as desired 8 1 Troubleshooting Magtech manufactures custom built products so each transmitter has been specifically designed to fit on a magnetic level gage or be inserted into a tank vessel and has been approved by the end user at some point during the ordering purchasing process Each transmitter has been factory calibrated to meet end user requirements so there is no need to recalibrate these transmitters unless the requirements have changed from the time of purchase delivery to installation If the need arises to calibrate these units to a new range please carefully read and follow the calibration procedure in the instruction and operation I O manual or consult the factory Always feel free to contact the factory if any questions or uncertainties arise The following guide has been established to guide the end user through some troubleshooting procedures if the need arises There are 3 basic scenarios that
36. or tube are re aligned at the centers of the process connections A When insulating gages Magtech level transmitters have a maximum operating temperature of 300 F When insulating a mag gage and transmitter assembly in HOT service keep the transmitter OUTSIDE the insulating material Special blankets for this type of insulation are available from Magtech and recommended to guarantee proper insulation For further information consult the factory 10 Section 5 Field Wiring 5 0 Recommended Loop Wiring The following is the recommended loop wiring Ro Load Resistor 250 ohm Recommended Wire 18 24 AWG twisted shielded pair 222 Magrola Rd Paartano Tamas 77584 Phona 231455075 BANE graria mee a Rie OES ee MEA TWO ME Recommended wiring Dina ro IMHE MRAR COMIDAS Ce LART HEHA ME MERSE OO NH UL ie H ER CUA E Figure 13 Recommended Loop Wiring 11 The following is the Hart Topology Control System Current Sensing Resistor Recommended Wire 18 24 AWG twisted shielded pair Isolated Network LTM 300 or LTM 350 Two wire loop powered transmitter Multi DB rop Network LTM300 or LTM 350 Two wire loop powered transmitter M t h 3902 Magnolia Rd a g e G Peanand Texas 775604 Division of ISE of Texas Inc Phone 261 466 0766 gt gt ITLE DE SCRIPTION LTH 2007 350 HART Loop Wiring Topology THIS DRAWING CONTAINS PROPRIETARY INFORMATION DRAWING NUMBER PLEASE DO NOT DUPLICATE
37. ranty expressed or implied by any party other than Magtech Repairs and or replacements shall be at the sole discretion of Magtech based on the terms and conditions of this warranty Defective products shall be returned to the factory prepaid by the buyer after obtaining a Return Authorization Number from Magtech All warranty repairs or replacements will be performed at the factory in Pearland Texas Surface return freight will be paid by Magtech Factory warranties do not include field service Field service warranty repairs will be at the buyer s expense Consult Magtech for field service rates Any modifications to terms and condition of this warranty will not be binding unless made in writing and signed by an authorized agent or official of Magtech All Magtech gages and transmitters should be unpacked and thoroughly inspected upon receipt Gages are shipped FOB factory and are fully protected against damage or loss during shipment Any claims for parts damaged during shipment should be submitted within 15 days of receipt of goods by customer We value your opinion and want to better serve you Please go our website www isemagtech com and click the customer feedback survey option on the left side of the screen Some of the best suggestions for improvement come from our valued customers Let us know how we are doing and what we can do better to improve your satisfaction with our product and service Section 2 Tra
38. se Even signals received during the active window are evaluated and filtered so that only high integrity data is accepted The conditioned signal is converted to a percent of full scale number and a number representing the distance and output as a digital signal LTM 250 350 LTM 350 via HART protocol only 2 Primary Level and Interface Level A second float may be added below the first and the second output will be calibrated automatically The second time interval is timed in the same manner as the first one and added to the first to derive the position of the heavier float The two floats require a separation of approximately three inches The float size geometry and magnetic strength all play a factor in how close the two floats can be without interfering with each other 3 Primary Level and Temperature An optional temperature sensor is embedded inside the bottom tip of the probe and it is configured to be the third digital output of the transmitter and comes factory calibrated for the operating range of 50C to 149C 58F to 300F 4 Primary Level Interface Level and Temperature This options is called a full blown unit and offers all three possible outputs A A deadband of approximately three inches next to the detector is fixed in the software and the float is not permitted to enter this area If this happens output readings maybe erratic or go to fail mode Section Inst
39. t 2 npt conduit epoxy coated aluminum NEMA 4X 7 Humidity Limits SAMA PMC 31 1 5 2 Vibration Limits SAMA PMC 31 1 5 3 RFI Limits SAMA PMC 31 1 20 to 1000 MHz Up to 30 V m 6 3 Sensor Probe Specifications Material 5 8 316ss standard optional Hastalloy Monel or Kynar sleeved Operating Temperature 50 to 149 C 58 to 300 F Maximum Pressure 2000psig 300F Range 12 in to 30 ft 14 Section 7 Menu Structure and Features 7 0 Pushbutton Operation The menu structure and pushbutton operation of the LTM series transmitters is simple and user friendly The electronics module has 3 pushbuttons from left to right 4 This button is used to increment values and change Yes to No and No to Yes VY This button is used to decrement values and change Yes to No and No to Yes This is the enter button used to execute functions and enter exit into or out of submenus A The pushbuttons are timed not pressurized It does not matter how hard firm you press them The buttons depend on the length of time they are pressed The longer you hold the button the faster it will increment decrement values Hold the enter button down for 2 seconds to enter the configuration menus and 1 second for all subsequent menus Note Jumper in write protect position disables the push buttons Increment Next Enter Select Decrement Next Write Enable Write Protect 2 pins
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