Magtech LTM-350 Instruction & Operation Manual
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Magtech LTM-350 Instruction & Operation Manual

Magnetostrictive level transmitters hart registered
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LTM – Series
Models: LTM-250 and LTM-350
Magnetostrictive Level Transmitters
Instructions &
Operation Manual
3902 Magnolia Rd.
Pearland, Texas 77584
Phone: 281-488-0788
Fax:
281-488-7080
E-mail:
magtech@isemagtech.com
Website: www.isemagtech.com
LTM-350_IOM Rev.5 03/11

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  • Page 1 3902 Magnolia Rd. Pearland, Texas 77584 Phone: 281-488-0788 Fax: 281-488-7080 E-mail: magtech@isemagtech.com Website: www.isemagtech.com LTM – Series Models: LTM-250 and LTM-350 Magnetostrictive Level Transmitters Instructions & Operation Manual LTM-350_IOM Rev.5 03/11...

  • Page 2: Table Of Contents

    6.0 Hazardous Locations/General Ratings ......................14 6.1 Electrical Specifications ..........................14 6.2 Sensor Probe Specifications ........................... 14 Section 7: Menu Structure and Features ......................15 7.0 Pushbutton Operation........................... 15 7.1 Menu Structure ............................. 16 7.2 Features (also exclusive features for models: LTM-250/350)............... 22...
  • Page 3 Table of Contents Section 8: Transmitter Calibration and Troubleshooting................28 8.0 Calibration ..............................28 8.1 Troubleshooting ............................28 8.2 Power Supply Troubleshooting ........................29 8.3 General Troubleshooting..........................29 Section 9: LTM-350 has HART Protocol ......................30 9.0 HART Protocol: General Information / Flowchart of HART Menus............... 30 Icon Key Warning/Caution Valuable Operation Information Important Information to Know...

  • Page 4: Section 1: Warranty

    Magtech. Repairs and/or replacements shall be at satisfaction with our product and service. 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.

  • Page 5: Section 2: Transmitter Overview

    = Any hazardous location area classification markings that the instrument is approved for. Magtech is always willing to explore ZZ/ZZ = Born on date; the2 digit month and 2 digit unique applications that require their own year the instrument was shipped to the customer.

  • Page 6: Gage Mounted Transmitter

    The LTM-Series may be strapped to the outside of When a magnetic level gage is not present, the LTM the Magtech LG series magnetic level gage. In such can be inserted into the tank/vessel with its own an installation, it is used as an accessory transmitter float mounted around the sensor tube.
  • Page 7 A stilling well may be used along with the Optional Features that are available with the transmitter inside the tank. Stilling-well is a pipe LTM-350 but NOT the LTM-250 are: external to the sensor probe and float encasing the 1. HART Protocol, which enables:...

  • Page 8: Section 3: Transmitter Description

    (or time-of-flight) of this wave is measured precisely and if the wire properties remain stable, it Magtech also has a stainless steel enclosure is very repeatable at about 5-10 microseconds per that can be utilized. Please contact factory for inch, which is approximately the speed of sound in further details.
  • Page 9 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)

  • Page 10: Section 4: Installation

    4.0 Gage Mount Installation The LTM-Series can be mounted to the side of a transmitters, can be removed to allow the float to Magtech LG series level gage using special mounting slide off the sensor tube. brackets and stainless steel hose clamps. When mounting the transmitter to an LG series gage the 4.2 General Installation Guidelines...
  • Page 11 2. Identify Proper Orientation of Transmitter: There are a few possible orientations of the LTM Series transmitters, they are: Do not over tighten the clamps because they will bend and distort. Figure 10. Top view of mounting clamps and sensor probe Figure 9.
  • Page 12 4. Remote Mount Electronics Option. Due to process temperature, vibration or accessibility the housing/electronics of the LTM transmitter There are a variety of ways to install a can be remote mounted as far as 25 ft. The standalone transmitters (i.e. crane, lift, etc…), housing/electronics are supplied with a pipe- the basic rule to remember when installing an mount bracket that can be mounted most...

  • Page 13: Insulation (Against Extreme Heat/Cold)

    (against extreme heat/cold) Magtech strongly recommends that an experienced (When insulating gages): Magtech Technician do insulation of the magnetic Magtech level transmitters have a maximum level gages at the factory with externally mounted operating temperature of 300 F. When insulating a transmitters.

  • Page 14: Section 5: Field Wiring

    Section Field Wiring 5.0 Recommended Loop Wiring The following is the recommended loop wiring. Figure 13. Recommended Loop Wiring...
  • Page 15 The following is the Hart Topology. Figure 14. HART Loop Topology Please visit www.hartcomm2.org to learn more about HART Protocol.

  • Page 16: Area Classification Installation Safety

    5.1 Area Classification Installation Safety 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. 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.

  • Page 17: Section 6: Transmitter Specifications

    Section Transmitter Specifications 6.1 Hazardous Locations / 6.2 Electronic Specifications General Ratings Supply Voltage: 13 – 36 Vdc (13V @ 20mA) CSA and CSAUS: Explosion Proof: Repeatability: .005% of full scale or Class I Div. 1 or 2, Grps. B, C, D .010”, whichever is greater Class II, Grps.

  • Page 18: Section 7: Menu Structure And Features

    Section 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): ↑ : This button is used to increment values and change “Yes” to “No” and “No” to “Yes”. ↓...

  • Page 19: Menu Structure

    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: 1. Level (in selected engineering units) 2.
  • Page 20 The following is the LTM-250/350 LCD Menu Flowchart Magtech Magtech LTM-250 LTM-350 SW Rev 1.00.00 HW Rev 1.00.00 Display? Scroll > Level > Intrface* > Temp** > mA Out > % Range SelLngth 30.00 in Lvl Unit in > ft > mm > cm > m Temp Unit** C >...
  • Page 21 7.1 Menu Structure Continued… Description LCD Menu (example) Manufacturer and Model: M a g t e c T M - 3 5 0 Software Revision Status: This is the current software revision. R e v Hardware Revision Status: This is the current hardware revision. R e v .
  • Page 22 7.1 Menu Structure Continued… Description LCD Menu (examples) Select PV: S e l This menu allows the user to select the L e v measurement that controls the transmitter’s current output (mA). This menu only appears if the interface (2 floats) option is provided. S e l A l Select Alarm: F a i l...
  • Page 23 7.1 Menu Structure Continued… Description LCD Menus (examples) Rate of Change (RoC) Filter: R o C F This parameter helps ignore erroneous readings 1 0 .0 i n / s from the transmitter’s surroundings. If the user knows how fast the level can change in the vessel (i.e.
  • Page 24 T r i m D A C 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.

  • Page 25: Features (Also Exclusive Features For Models: Ltm-250/350)

    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 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.
  • Page 26 7.2 Features (Exclusive to the LTM-250/350 models) There is an “advance” menu incorporated into the LTM-250/350 models. To access this menu press and hold the increment (↑) button first then while holding the increment button press and hold the enter button for 3 seconds.
  • Page 27 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.
  • Page 28 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”...
  • Page 29 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.
  • Page 30 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.

  • Page 31: Section 8: Transmitter Calibration And Troubleshooting

    Transmitter Calibration and LTM Troubleshooting 8.0 Calibration 8.1 Troubleshooting Magtech manufactures custom built products so each transmitter has been specifically designed to There really is no need to re-calibrate this fit on a magnetic level gage or be inserted into a instrument.

  • Page 32: Power Supply Troubleshooting

    8.2 Power Supply Troubleshooting 2. Water damage to the electronics module or The LTM-250/350 is designed to operate with a sensor probe. This is potentially the most supply voltage of 13 – 36 Vdc (minimum 13V @ severe case the symptoms are unpredictable. If...

  • Page 33: Section 9: Ltm-350 Has Hart Protocol

    Section LTM-350 has HART Protocol 9.0 Hart Protocol: General Information 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.
  • Page 34 9.0 Hart Protocol: Menus and Flowchart (continued…) Basic Level Keypad Setup>>>>>>> > Setup>>>>>>>>>> > Rerange>>>>>>>>>>>> > Orientation is: Level Offset PV is: (Note 2) Rate of Change Unit LCD Output is: Probe Length Level Units Temper Units (Note 3) Damping Detailed Device Setup>>>>>...
  • Page 35 9.0 Hart Protocol: Menus and Flowchart (continued…) HART Information>>>>>> > Manufacturer Model Unique ID Serial Number Date Sales Order Purchase Order Long Tag Message Descriptor Revision #s>>>>>>>>>>>>>>>>> > Universal rev Fld dev rev Final asmbly num Note 1. When Interf is PV, Interf is displayed. Software rev Note 2.

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