BABBITT LTM Series Instruction & Operation Manual Download Page 34 | Manualshive

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The following screens show the D/A Trim method and Loop Test Method.

D/A Trim

31

The “Loop Current” menu has the parameters that affect
the analog output of the transmitter. The Alarm Type can
be change from high to low or holdout. D/A trim is used
to scale the accuracy of 4.00 mA and 20.00 mA. Loop Test
is very useful in startup situation where the transmitters
operation can be verified and the 4/20 loop can be
checked with control system. The D/A trim and Loop Test
are methods that go through a step by step procedure.

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Summary of Contents for LTM Series

Page 1: ...strictive Level Transmitters Operation 5155 April Lane Houston Texas 77092 Phone 713 467 4438 Fax 713 467 8736 E mail sales babbitt us 250 and LTM 350 Level Transmitters Instructions Operation Manual Instructions Manual LTM 350_IOM Rev 3 08 09 ...

Page 2: ...ion 7 4 0 Gage Mount Installation 7 4 1 Standalone Installation 7 4 2 General Installation Guidelines 7 4 3 Insulation against extreme heat cold 10 Section 5 Field Wiring 11 5 0 Recommended Loop Wiring 11 5 1 Area Classification Installation Safety 13 Section 6 Transmitter Specifications 14 6 0 Hazardous Locations General Ratings 14 6 1 Electrical Specifications 14 6 2 Sensor Probe Specifications ...

Page 3: ...eshooting 26 Section 9 LTM 350 has HART Protocol 27 9 0 HART Protocol General Information 27 9 1 Process Variables 27 9 2 HART Info 28 9 3 Device Setup 30 9 4 Calibration Review 43 9 5 Advanced Setup 45 9 4 Device Diagnostics 46 Icon Key Warning Caution Valuable Operation Information Important Information to Know Read Carefully these Tips are the DON Ts of the instrument ...

Page 4: ...t All warranty repairs or replacements will be performed at the factory in Houston Factory warranties do not include field service Field service warranty repairs will be at the buyer s expense 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 be unpacked and thoroughly inspected upon receipt Gages a...

Page 5: ...r 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 0 and 100 4 20mA output range YYYY 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 ...

Page 6: ...be required 2 4 Standalone Transmitter When a magnetic level gage is not present the LTM 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 i...

Page 7: ...LTM 350 but NOT the LTM 250 are 1 HART Protocol which enables a A second 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 Th...

Page 8: ...roperly 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 01 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 m...

Page 9: ...ise 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...

Page 10: ...ions are available upon request 2 mnpt flanges etc The magnetic float used in the 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 d...

Page 11: ... 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 Figure 10 Top view of mountin...

Page 12: ...nd 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...

Page 13: ...r 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 3 Make sure that the 0 and 100 4 20mA marking on the sensor tube are re aligned at the centers of the process connections When insulating gages ...

Page 14: ...Section 5 Field Wiring 5 0 Recommended Loop Wiring The following is the recommended loop wiring Figure 13 Recommended Loop Wiring 11 ...

Page 15: ...The following is the Hart Topology Figure 14 HART Loop Topology Please visit www hartcomm2 org to learn more about HART Protocol 12 ...

Page 16: ...hen exp conduit must be sealed within 18 inches of the termination point at the instrument Power must be supplied by an isolated supply 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 ...

Page 17: ...n Limits SAMA PMC 31 1 5 3 RFI Limits SAMA PMC 31 1 20 to 1000 MHz Up to 30 V m 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 020 whichever is greater Damping 1 to 25 seconds Operating Temp 50 to 85 C 58 to 185 F Material 5 8 3...

Page 18: ...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 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 ...

Page 19: ...face when option is provided in selected engineering units LTM 350 only 3 Temperature when option is provided in selected engineering units LTM 350 only 4 The analog current corresponding to level in mA 5 Percent of range corresponding to level in If the user desires to enter into the configuration menus simply press hold the enter button for 2 seconds Make sure the electronics are not in write pr...

Page 20: ...ect 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 ...

Page 21: ... 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 ...

Page 22: ...ter There is no need to recalibrate the instrument simply use the Change Range menu and change the LRV and URV as desired If the need arises to use this menu then level simulation will be required at 0 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...

Page 23: ...ent 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 option is excellent for plant startup verification Exit This signifies the last menu before the main screen If the user desires go back through t...

Page 24: ...field For example if the level in a tank cannot rise or fall faster than 1 0 in s then the setting for the RoC filter should be set to 2 0 in s or more to help filter ignore erroneous readings The engineering units will change according to units selected i e cm s exclusively for models LTM 250 350 Offset The offset is a digital number that gets added to both the LRV and URV to account for any dist...

Page 25: ... 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 The factory settings can never be overwritten or saved to only load from Single Point Calibration 1pt Cal The following menu is the 1 point Calibration option The need may arise to recalibrate the transmitter ...

Page 26: ...ation menu that is utilized to achieve this task To access this menu press and hold the increment 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 Confi...

Page 27: ...if this option is being utilized 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 Conversion from Gage Mount to Standalone When converting from a gage mount transmitter to a standalone transmitter or vi...

Page 28: ...nge menu and adjust the LRV or URV as desired 8 1 Troubleshooting 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 ...

Page 29: ...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 proble...

Page 30: ... based format allowing for a more familiar environment for computer users The following depictions are shown with a Magtech specific DD some feature or parameters may not appear in HART Generic mode The LTM 350 has 6 major monitoring and configurations menus They are 1 Process Variables 2 HART Info 3 Device Setup 4 Calibration Review 5 Advance Device Setup 6 Device Diagnostics 9 1 Process Variable...

Page 31: ...r can access this information when attempting to order a duplicate transmitter or figure out if the instrument is still under warranty Note The serial number is highly beneficial when ordering an identical unit The following HART information is necessary for any end user trying to set up polling or host configuration ...

Page 32: ...cation Generally the Tag is provided by the customer at time of order Note Long Tag can be up to 32 ASCI characters Message and Descriptor can be utilized to describe the application The Revisions menu displays the latest major Hart Revision Field Device Revision and Software and Hardware Revisions ...

Page 33: ...e but is not recommended Note probe length is NOT the measuring range it is the overall length of the transmitter including its deadbands The parameters shown in bold can be edited by the user Changing PV URV from 14 00 to 12 00 would scale the 4 to 20 mA output of the instrument without level simulation Level Offset is a digital value added to both the LRV and URV but does not affect the mA outpu...

Page 34: ...transmitter The Alarm Type can be change from high to low or holdout D A trim is used to scale the accuracy of 4 00 mA and 20 00 mA Loop Test is very useful in startup situation where the transmitters operation can be verified and the 4 20 loop can be checked with control system The D A trim and Loop Test are methods that go through a step by step procedure ...

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Page 38: ...Loop Test 35 ...

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Page 42: ...nsmitter needs to detect level at the 0 and 100 points There is almost never a need to do a Full Level Trim the LTM 350 and 250 has 1 point calibration capabilities which allow calibration with existing level conditions Also there are factory default configurations can be utilized to revert the transmitter back to its original settings at time of shipment 39 ...

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Page 46: ...mpting to troubleshoot with factory assistance 43 The Misc menu shows Magtech s software and hardware revision status In following number 1 01 05 the first 1 stands for the Major Device Revision HART the 01 is for future features and 05 is for any minor software updates Level Gain calculated slope using the linear equation y mx b The menu depicts the raw data value in tics for the upper distance l...

Page 47: ... also displayed in engineering units Raw Temper A D the raw RTD value when configured Level Pulse the raw level reading live Interface Pulse the raw interface reading when configured Tic Limit the raw probe length value x 2 The raw values of the digital to analog converter DAC ...

Page 48: ...ction 7 2 Change Signal The Device Profiles menu is easily the most valuable menu that the LTM 350 has to offer This menu can be used to re call the transmitter back to its original factory settings if parameters have been undesirably changed Up to 3 additional settings can be stored to allow for easy plug load play action 45 These are digital alarms that can be utilized when attempting to control...

Page 49: ...9 6 Device Diagnostics Device Diagnostics is a continuous monitor of transmitter health The Device Status lets the user know about the analog output behavior of the transmitter 46 ...

Page 50: ...Operation status lets the user know how the transmitter is operating internally 47 ...

Page 51: ...Calibration Status lets the user know if the instrument has been incorrectly calibrated 48 ...

Page 52: ...Level Alarm status menu lets the user know if one or more of the digital alarms have been activated if enabled by user 49 ...

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