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Babbitt

Level Transmitters for Liquid Level Gauges

Level Transmitter for Lquid Level Gauge

Babbitt level transmitters for the LG Series liquid level gauges are designed to provide an analog output for continuous levelmonitoring and control. Thesetransmitters mount on the outside of a level gauge chamber. The units do not come into direct contact with the process. They can be calibrated and servicedwithout shutting down your process.

These level transmitters are actuated by the magnets in the level gauge float. As the float rises and falls with the process level, the transmitters detect the position of the float, and provide a proportional 4-20mA output to your process control system or recorder.

LT-1 Transmitter
The LT-1 level transmitter consists of a sensor tube made up of a string of resistors and magnetically operated reed switches. There is a switch and resistor every 1/2 inch along the length of the sensor tube. The circuit board containing the resistors and switches may be the same length as the measured range or any portion thereof. The sensor circuit is encapsulated in the stainless steel sensor tube. The transmitter housing (rated for Class 1, Div 1, Groups C, D hazardous areas) is mounted at the top of the sensor tube. As the magnetic float inside the level gauge chamber rises with increasing fluid level, the reed switches close, thereby changing the resistance in the circuit. A two-wire transmitter converts this resistance change to a 4-20mA current signal corresponding to fluid level. Resolution of the transmitter is 1/2 inch.

LTM-100 Transmitter
The LTM-100 Series magnetostrictive level transmitter may be used as a stand-alone top-mount level transmitter or may be mounted externally on the LG series magnetic level gauge. It is typically used in applications where precision accuracy and high repeatability is required. The unit offers a HART protocol with the 2-wire 4-20mA output for level or interface. The LTM transmitter consists of a sensor tube (typically 1/2" 316SS) which houses the waveguide. The waveguide is made to order in lengths up to 20 feet, with longer waveguides available in a flexible probe design, assembled in 8 foot sections. A low-power microprocessor circuit, housed in an explosion-proof condulet, is used to generate a current pulse down the waveguide. Liquid level is detected when the magnetic field of the float interferes (restricts) with the current pulse signal. Very precise level measurement is possible using this magnetostrictive technology. Field calibration is simple with on-board zero and span push-buttons or with conventional HART hand-held calibrators. The LTM-100 transmitters simply mount to the side of the gauge chamber and is ideal for high-pressure and high-temperature applications.

Flipper / Roller Option
In addition to the standard magnetic follower style indicator, Babbitt also offers a flipper or roller style indicator. These consist of a series of small metal flags that are black on one side and yellow on the other. As the magnetic float passes each flag with rising or falling liquid level, the flag rotates 180 degrees to show the other color, yellow indicating the liquid level and black the vapor space. These flags are spaced every 0.4 inches (30 per foot) and give a very distinct yellow column corresponding to the tank level. Red/Black flags are also available. The flags rotate on a ceramic and stainless steel bearing surface. They are housed in an extruded aluminum channel with a recessed glass window. After assembly, the unit is purged with inert gas (argon) and hermetically sealed. The assembly is custom made for each level gauge and is one continuous piece up to 20 feet, with no joints or blind spots. Babbitt flipper/roller indicators have been tested through 50,000 cycles at float travel speeds from 10 feet per minute to 800 feet per minute without a failure.


 
 
     
LT-1 Specifications LTM-100 Specifications
Sensor Tube Assembly:
Measuring Length Up to 20 ft standard
Max. Operating Temp. 500 Deg F
Housing Stainless Steel
Sensor Tube Assembly:
Measuring Length Up to 20 ft standard. Flex probe in 8 ft sections for longer lengths.
Operating Temp. -40 to +300 Deg F (high-temp option available)
Housing 1/2" 316 Stainless Steel, other materials optional.
Transmitter Electronics Assembly:
Resolution 0.5 inch
Output 4-20mA (2-wire)
Load 750 ohms max.
Power 24VDC nominal
Max. Operating Temp. 150 deg F
Housing Explosion-proof Class 1, Div 1, Group C, D.
Specifications are subject to change without notice.
Transmitter Electronics Assembly:
Resolution 0.025% of full scale
Sensor Accuracy Greater of 0.01% of full scale or 0.030"
Repeatability Greater of 0.005% of full scale or 0.015"
Non-linearity Greater of 0.01% of full scale or 0.030"
Output 4-20mA (2-wire) with HART protocol
Damping Field adjustable, 1 to 5 seconds.
Power 13-36VDC
Operating Temp. -40 deg F to +150 deg F High-temp option is available.
Housing Explosion-proof Class I, Div 1, Group A, B, C, D. Class II, Div 1. Class III.
   
[ LL Worksheet ] [LL Spec Sheet]
   
 
 
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