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Level/Interface. 

 A second float may be added below the first    one, 

and the second output will be calibrated automatically.  The second 

time interval is measured in the same manner as the first and added 

to the first to derive the position  of the heavier float.

The same six inch dead zone applies to the measurement 

of the second level although the reasons are different.  This 

will typically correspond to a physical separation of the two 

floats by approximately three inches.  The float size, geometry, 

magnetic strength all play a factor in how close the two floats 

can get without interfering with each other.

 

The LTM-300 can be mounted to the side of a MagTech LG series level gage 
using a special mounting bracket 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 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  dimensions.    Calibration  of  the  probe  will  be  factory 
set along the active region of the probe; however, a field calibration may 
have to be performed to match the probe to the desired control room 
specifications.

If a transmitter is being purchased for an interface gage, the calibration 
for the probe should be done in the field to ensure a proper control room 

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.

The  LTM-300  stand-alone  transmitter  comes  equipped  with  a  3/4” 
compression fitting, mounted approximately 6.00” 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 stand-alone 
drawings for a visual description of the transmitter features.  Optional 
mounting configurations are available upon request.  

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 wider 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 steel to kynar.

SECTION 3.  Installation and Wiring

3.0 Strap-On Transmitter Installation

CAUTION:

During installation, do not attempt to twist or turn the head of the 
transmitter. Damage to the detector assembly may occur if the head 
is rotated . If the head is loose, please notify the factory.

3.1 Standalone Transmitter Installation

The magnetic float can be changed out at any time to accommo-
date the processes being measured.  The float stop, located at the 
bottom of the transmitter, can be removed to allow the float to slide 
off the sensor tube.  

3

PLEASE NOTE:

If using a transmitter configured for dual level output or interface 
measurements, remember to slide the float with the lightest grav-
ity range first.

3.

INTERCONNECT WIRING (CSA & FM)

Summary of Contents for LTM-300 Series

Page 1: ...81 488 0788 FAX 281 488 7080 EMAIL magtech isemagtech com www isemagtech com LTM 300 Series Magnetostrictive Level Transmitter Instruction Operation Manual 3902 Magnolia Road Pearland Texas 77584 Jan...

Page 2: ...r Installation 3 3 1 Standalone Transmitter Installation 3 3 2 Recommended Wiring Single Loop 4 Section 4 Speci cations Page 4 0 Transmitter Electrical Speci cations 4 4 1 Transmitter Sensor Tube 4 Se...

Page 3: ...hange and continuously activates the sensor in the tube The electronics in the housing process the changing signal and update an analog 4 20 mA output This analog output is precisely proportional to t...

Page 4: ...e base to resolve sub microsecond timing increments The binary number equivalent to the microseconds of the echo travel time is written to an output D A Converter and subsequently converted to a 4 20...

Page 5: ...ectronicshousingmountedatthebottomofthegageforeasyaccess THIS MUST BE SPECIFIED AT TIME OF PURCHASE Installation Note European The cable entry devices and blanking elements of unused apertures shall b...

Page 6: ...gurations A single output version with only one variable that will output a 4 20 mA signal for level The second con guration is a transmitter tted with a second oat to provide a digital output for in...

Page 7: ...elect Data not required Span Trim Move the oat to the 20mA mark 100 on the probe Using the arrow buttons input the correct distance from the zero point and then Select Level O set Enter the desired va...

Page 8: ...ion Problems 6 2 Magnetic Interface 6 3Troubleshooting Power Supply Problems Never move a magnet in a perpendicular motion from along the sensor tube This will always leave a residual eld in the waveg...

Page 9: ...as this could leave magnetic indentation in the sensor wire The LTM 300 level transmitter has an inductor located inside the bulkhead of the sensor tube During operation of the transmitter this induc...

Page 10: ...d the Alarm type In addition this screen presents the procedure to select the Primary variable PV if the transmitter is con gured with both Level and Interface It also displays the menu that will allo...

Page 11: ...t are not normal Any status items not reported are within the normal range of operation or calibration The HART Communicator issues a command to receive the results of the transmitter diagnostics Duri...

Page 12: ...xited if the user selects End The example shows the user selection 4mA The user must press ENTER before the procedure continues When the user selects the Loop test option the HART Communicator display...

Page 13: ...output to 4 000mA the user is to enter the reference meter reading For example if the meter actually reads 4 234mA that value is input with the keypad The user must press ENTER when the current value...

Page 14: ...matic control After the user presses OK the HART Communicator returns to the Calibration screen The HART Communicator is now at the starting screen for the Zero Level Trim Full Level Trim Starting at...

Page 15: ...now be returned to automatic control After the user presses OK the HART Communicator returns to the Calibration screen The HART Communicator is now at the starting screen for the Full Level Trim Zero...

Page 16: ...ed 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 calibr...

Page 17: ...t Value for 4mA and 20mA by Keypad If you desire to change the Level value at which the Current output is 4mA and 20mA when the Level is the selected Primary Variable or change the Interface value at...

Page 18: ...g the edit box to continue with the reranging of the transmitter 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...

Page 19: ...pper range value getting an update of the digital reading from the transmitter or leaving the 20mA range point as it was If the user accepts the measurement value as the 20mA loop current point the HA...

Page 20: ...h is set in the factory when the unit is prepared for shipment The probe length is used as a reference for a number of diagnostics fuctions as well as setting the URL and LRL shown on the Keypad reran...

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