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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

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.

Supply Voltage:     

15 to 36 VDC

Repeatability: 

 

.005% of full scale or .010”,

                                                          whichever is greater

Non-Linearity: 

 

.01% of full scale or .030”,

                                                          whichever is greater

Level Sensor Accuracy: 

.01% of full scale or .020”,

                                                          whichever is greater

Analog Output Resolution:  .025% of full scale, (1) 4/20 mA

                                                          primary level.

Output:   

 

One 4-20 mA output: 

                                                          Level Option: Two Digital 

                                                          Outputs: Temperature and/or

                                                          Interface via HART only.

Calibration:                                    Zero and span field adjustable 

                                                          with push buttons or HART.

                                                          Secondary level is auto-

                                                          connect. Temperature is 

                                                          configured via HART or AMS

                                                          only.

Diagnostics:                                  On board diagnostics for 

                                                          troubleshooting via HART or 

                                                          AMS 

Dampening:                                  1 to 25 seconds (field 

                                                          adjustable) via HART

Oper. Temp. (electronics)         -58 to 185°F  (-50 to 85°C)

 

Housing:                                        Explosion Proof, Dual

                                                         Compartment, 

H

” NPT, Epoxy

                                                         Coated Aluminum 

Polarity Protection:                     Diode in series with the loop

Hazardous Location Approvals: FM - Exp Cl l , Div. I Grp. B C D, 

                                                             Cl II Grp. E F G, Cl III

CSA - Ex ia (Intrinsically Safe): Cl I, Div. I, Grp. C D

           Exp (Expl. Proof): Cl I, Div. I, Grp. B C D, Cl II, Grp. E F G, Cl III

IECEx (Expl. Proof): Ex d IIC T4

Atex (Expl. Proof): EEx d IIC T4          Ex II 2 G

The LTM-300 transmitter is available in three different configurations.  A 

single output version with only one variable that will output a 4-20 mA 

signal for level.  The second configuration is a transmitter fitted with a 

second float to provide a digital output for interface level in addition to 

the primary level output.  The third configuration is one 4-20 mA signal 

for Primary level and two additional digital signals with one for interface 

level and one for temperature output.

Configurations  two  and  three  have  independent  calibration  as  well 

as independent outputs.  These configurations have the capability for 

calibration and measurement using a HART protocol communications 

system.  The HART specifications and conditions will be discussed in detail 

under the HART COMMUNICATION section of the manual.  The temperature 

range is factory set from –50°F to 300°F.

Pushbutton Calibration

Step 1 - Move jumper to the write enable position (see below)

Step 2 - Move your float or magnet to the 4mA (0%) point on the probe

Step 3 - Press the ENTER button on the display until “Trm Snsr” is 

displayed. Press the UP arrow to display “Yes” and press ENTER.

Step 4 - The display will read “Trim Zero”. Press ENTER.

Step 5 - Move the float or magnet to the 20mA (100%) point on the 

probe.

Step 6 - The display will read “Trim Span” with a value above. Using the 

arrow buttons, input the correct distance from the zero point and press 

Enter. Calibration is now completed. 

Note: “Sel Lngth” value is factory set and should not be changed. Doing 

so will cause a level error indication.

SECTION 5.0  Calibration

SECTION 4.  Specifications

5.0 LTM-300 Output Configurations

3.2 Recommended Wiring, 

Single Loop

4

4.0 Transmitter Electrical Specifications

4.1 Transmitter Sensor Tube

FRONT PANEL

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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