Resumen del contenido incluido en la página 1
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.com
Resumen del contenido incluido en la página 2
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 . . . . . . . .
Resumen del contenido incluido en la página 3
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. The optional t
Resumen del contenido incluido en la página 4
Calibration routines are included in the software to scale the 4 and SECTION 2. Instrument Description 20 mA points for any distance desired. Even reverse calibration is a simple task using the software routines. Reverse calibration is 2.0 Transmitter Detailed Description desirable if ullage instead of full level is required, or when the probe is installed with bottom mount head. See Section on Calibration for The LTM-300 is an assembly of two major components: further details. • Th
Resumen del contenido incluido en la página 5
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 The LTM-300 stand-alone transmitter comes equipped with a 3/4
Resumen del contenido incluido en la página 6
Ambient Temp. Range -20°C ... +40°C (-4°F ... 104°F) 3.2 Recommended Wiring, Single Loop 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
Resumen del contenido incluido en la página 7
5.1 LCD Menus For The LTM-300 1 2 3. 4 5 i n Displays L e v e l Level Measurement Display - in inches 4 5 6 7 . 8 cm Level measurement Display - in centimeters 9 0 1 2 3. m m L e v e l Level Measurement Display - in millimeters 5 6. 7 8 9 f t Level Measurement Display - in feet L e v e l 2 3. 4 5 6 m Level Measurement Display - in meters L e v e l 1 2 3. 4 5i n Interface Measurements
Resumen del contenido incluido en la página 8
6.4 Start-Up for Gage-Mounted SECTION 6. Troubleshooting and Maintenance LTM Transmitters 6.0 Diagnostics are Via HART Gage and Transmitter Installation 6.1 Calibration Problems 1. Visually inspect Mag-Gage and transmitter installation to If the transmitter does not appear to calibrate properly, or has an erratic insure transmitter is positioned with the 4 mA and 20 mA output, check the deadband of the sensor tube and ensure that the labels directly adjacent to the process connections.
Resumen del contenido incluido en la página 9
5. If no float is present, or magnetic field is lost, HART 7.1 Insulation Warning Label Supplied Communicator will display “LEVEL SIGNAL LOST” 6. For calibration using HART, or to change range consult HART ----------WARNING--------- section of this manual. (When Insulating Gages) MagTech Level Transmitters have a maximum operating Note: In service over 400 Deg F (204C) Gages and temperature of 300°F. When insulating a Mag Gage and Transmitters should be properly insulated with transmitter
Resumen del contenido incluido en la página 10
If the user selects Basic setup from 8.1 HART Protocol Option Information the Device setup screen, the next screen has a mixture of further HART Communicator Overview menu selections and detailed information. This screen displays the name of the variable that is This section presents the major screen selections available to the controlling the output current (PV), user. The HART Communicator screens are shown on the left and the tag and the Alarm type. In a description of the screen
Resumen del contenido incluido en la página 11
If the user selects Operation Then the HART Communicator Status from the Diagnostics will report the results to the user screen, he is able to view all in sequence. In the example of the status bits indicating given here, the diagnostics has the health of the transmitter detected a problem with the Level operation. If the entry is labeled measurement that may require OFF, that means that the entry is user intervention. The user must in normal operating conditions. acknowledge this pro
Resumen del contenido incluido en la página 12
The HART Communicator informs If the user wishes to specify a loop the user that the maintenance current other than 4mA or 20mA, flags have been reset when the he must select the option Other transmitter has replied to the and then press the ENTER key. reset command. The user must acknowledge this information by pressing OK to continue. The user is then notified that The user must then input the exact the loop may now be returned value of loop current desired. After to automatic contro
Resumen del contenido incluido en la página 13
If it is desired to trim the digital level The transmitter, based on the value, he may select a single point data from the reference meter, zero trim or a full level trim that will calculate a new value for the requires the input of both the zero DAC zero calibration constant and level value and some other level change the output current based value preferably near the end of the on the new constant. If the current level measurement tube. read by the reference meter is If the transmitte
Resumen del contenido incluido en la página 14
The HART Communicator is now Zero Level Trim at the starting screen for the 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 Full Level Trim reference position. Starting at the Calibration If the user selects Zero Level screen, select the Full Level Trim Trim from the Calibration screen, procedure. This procedure trims this screen
Resumen del contenido incluido en la página 15
The HART Communicator now Zero Temperature Trim requests that the level float be set to the desired level upper trim point. The second trim point can Starting at the Calibration screen, be any other level point but it is select the Zero Temper Trim recommended that this point be procedure. This procedure trims as far away from the zero point as the Temperature digital value possible. When the float is at this measurement at the reference value position, the transmitter will always
Resumen del contenido incluido en la página 16
The transmitter will take about The user is then notified that fifteen seconds to insure that the the loop may now be returned temperature signal has stabilized. to automatic control. After the Once the measurement is stable, user presses OK the HART the procedure will continue without Communicator returns to the user intervention. The HART Calibration screen. communicator will then send the command to the transmitter to calculate the new Temperature zero calibration constant. The
Resumen del contenido incluido en la página 17
Reranging the Transmitter The user is then notified that Setting the Measurement Value for 4mA and 20mA by Keypad the loop may now be returned to automatic control. After the If you desire to change the Level user presses OK the HART value at which the Current output Communicator returns to the is 4mA and 20mA when the Level Calibration screen. is the selected Primary Variable, or change the Interface value at which the Current output is 4mA and 20mA when the Interface is the selected
Resumen del contenido incluido en la página 18
The HART Communicator will On returning to the Keypad rerange display this screen reminding screen, the values shown for LRV the user that the loop should be and URV are the changes that the removed from automatic control user has made. The user should before proceeding. When this has check the difference between the been done, the user must press OK URV and LRV and compare this value with the Min span listed to continue. on the menu. If the difference is smaller than the minimum span,
Resumen del contenido incluido en la página 19
The next screen gives the user If the user accepts the a choice to set the 4mA or 20mA measurement value as the values or to Exit the procedure. 20mA loop current point, the Here the user will select the 4mA HART Communicator issues the menu position. command changing the URV and when the transmitter replies, returns to the Set screen The HART Communicator requests When the user desires to leave the the user to set the Level (or Apply values procedure, he must Interface) to the posi
Resumen del contenido incluido en la página 20
If the user selects Output condition from the Detailed setup screen, The user must press F3 to send the he is presented with two menu Level Off set to the LTM300. selections, Analog output and HART output. If the user selects Analog output from the Output condition screen, the Alarm type is displayed and two options for procedures, Loop Test Probe Length and Scaled D/A trim. The Loop Test procedure is presented in the The Probe Length is set in the factory when the unit is Dia
