LTM-300 Series Magnetostrictive Level Transmitter Instruction & Operation Manual Jan 2009 3902 Magnolia Road Pearland. Texas. 77584 PH: 281/488-0788 FAX: 281/488-7080 EMAIL: magtech@isemagtech.com www.isemagtech.
LTM-300 Magnetostrictive Level Transmitter Instruction and Maintenance Manual Table of Contents Section 1. Transmitter Overview Page 1.0 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Level Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Gage Mounted Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Standalone Transmitter . . . . . . . . . . . . . . . .
SECTION 1. Transmitter Overview 1.0 General Description The LTM-300 is an electronic field instrument, suitable for installation in hazardous and non-hazardous industrial areas. Testing and certification has been obtained from different agencies for installation in specific areas. This instrument is a two wire, loop powered smart transmitter, designed to measure and transmit an analog 4-20 mA signal and two digital outputs (optional) proportional to liquid level in a tank.
SECTION 2. Instrument Description Calibration routines are included in the software to scale the 4 and 20 mA points for any distance desired. Even reverse calibration is a simple task using the software routines. Reverse calibration is desirable if ullage instead of full level is required, or when the probe is installed with bottom mount head. See Section on Calibration for further details. 2.
reading. For long transmitters it may be desirable for the operator to have the electronics housing mounted at the bottom of the gage for easy access. THIS MUST BE SPECIFIED AT TIME OF PURCHASE. Installation Note (European): The cable entry devices and blanking elements of unused apertures shall be of a certified flameproof type, suitable for the conditions of use and correctly installed. 3.1 Standalone Transmitter Installation 3.
3.2 Recommended Wiring, Single Loop Ambient Temp. Range -20°C ... +40°C (-4°F ... 104°F) 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 30V/m 4.1 Transmitter Sensor Tube Material: 316ss standard, optional Hastalloy, Monel, Kynar coated Operating Temperature: -50 to 302°F (-50 to 150°C) Maximum Pressure: 2000 psig @ 300°F Range: 12” to 30 ft. SECTION 5.0 Calibration 5.
5.1 LCD Menus For The LTM-300 1 2 3. Displays Level Measurement Display - in inches 4 5 in Level 4 5 6 7. Level measurement Display - in centimeters 8 cm 9 0 1 2 3. m m Level 5 6. 7 8 9 f t Level Level Measurement Display - in millimeters Level Measurement Display - in feet 2 3. 4 5 6 m Level 1 2 3.
6.4 Start-Up for Gage-Mounted LTM Transmitters SECTION 6. Troubleshooting and Maintenance 6.0 Diagnostics are Via HART 6.1 Calibration Problems Gage and Transmitter Installation If the transmitter does not appear to calibrate properly, or has an erratic output, check the deadband of the sensor tube and ensure that the float is within the active region of the probe. The active region of the sensor tube is typically marked with 20mA and 4mA stickers when the unit is calibrated before shipment. 1.
5. If no float is present, or magnetic field is lost, HART Communicator will display “LEVEL SIGNAL LOST” 6. For calibration using HART, or to change range consult HART section of this manual. 7.1 Insulation Warning Label Supplied ----------WARNING--------(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.
If the user selects Basic setup from the Device setup screen, the next screen has a mixture of further menu selections and detailed information. This screen displays the name of the variable that is controlling the output current (PV), the tag and the Alarm type. In addition this screen presents the procedure to select the Primary variable (PV) if the transmitter is configured with both Level and Interface. It also displays the menu that will allow the user to change the range values.
If the user selects Operation Status from the Diagnostics screen, he is able to view all of the status bits indicating the health of the transmitter operation. If the entry is labeled OFF, that means that the entry is in normal operating conditions. If the entry is labeled ON, that means that the transmitter diagnostics has detected an abnormal condition and the user needs to take corrective action. Then the HART Communicator will report the results to the user in sequence.
The HART Communicator informs the user that the maintenance flags have been reset when the transmitter has replied to the reset command. The user must acknowledge this information by pressing OK to continue. If the user wishes to specify a loop current other than 4mA or 20mA, he must select the option Other and then press the ENTER key. The user is then notified that the loop may now be returned to automatic control. After the user presses OK the HART Communicator returns to the Diagnostics screen.
If it is desired to trim the digital level value, he may select a single point zero trim or a full level trim that requires the input of both the zero level value and some other level value preferably near the end of the level measurement tube.
The HART Communicator is now at the starting screen for the Zero Level Trim. Zero Level Trim Starting at the Calibration screen, select the Zero Level Trim procedure. This procedure trims the Level digital value measurement at the position that the user desires to be the zero reference position. Full Level Trim Starting at the Calibration screen, select the Full Level Trim procedure. This procedure trims the Level digital value measurement at two points.
The HART Communicator now requests that the level float be set to the desired level upper trim point. The second trim point can be any other level point but it is recommended that this point be as far away from the zero point as possible. When the float is at this position, the transmitter will always report the digital value entered in the user chosen units. The user must press OK when the float is at that position.
The transmitter will take about fifteen seconds to insure that the temperature signal has stabilized. Once the measurement is stable, the procedure will continue without user intervention. The HART communicator will then send the command to the transmitter to calculate the new Temperature zero calibration constant. The user is then notified that the loop may now be returned to automatic control. After the user presses OK the HART Communicator returns to the Calibration screen.
Reranging the Transmitter Setting the Measurement Value for 4mA and 20mA by Keypad The user is then notified that the loop may now be returned to automatic control. After the user presses OK the HART Communicator returns to the Calibration screen.
The HART Communicator will display this screen reminding the user that the loop should be removed from automatic control before proceeding. When this has been done, the user must press OK to continue. On returning to the Keypad rerange screen, the values shown for LRV and URV are the changes that the user has made. The user should check the difference between the URV and LRV and compare this value with the Min span listed on the menu.
The next screen gives the user a choice to set the 4mA or 20mA values or to Exit the procedure. Here the user will select the 4mA menu position. If the user accepts the measurement value as the 20mA loop current point, the HART Communicator issues the command changing the URV and when the transmitter replies, returns to the Set screen The HART Communicator requests the user to set the Level (or Interface) to the position that is to provide the 4mA loop current output.
If the user selects Output condition from the Detailed setup screen, he is presented with two menu selections, Analog output and HART output. The user must press F3 to send the Level Offset to the LTM300. If the user selects Analog output from the Output condition screen, the Alarm type is displayed and two options for procedures, Loop Test and Scaled D/A trim. The Loop Test procedure is presented in the Diagnostics section and Scaled D/A trim is presented in the Calibration section.
