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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 temperature
output is configured via the HART communicator. Interface is auto-detect.
Note: Both floats have to be present for auto-detection. The complete
assembly includes a dual compartment explosion proof enclosure, and
attached sensor tube.
Optional Features of the LTM-300 include:
• Second digital output proportional to an interface level (requires
a second float of different specific gravity)
• Digital temperature output gives the liquid temperature and is
typically used for display and/or calculation of mass.
• A variety of lengths and wetted materials to accommodate many
different applications.
• Mass or Volume Information
Product Serial Number
Magtech assigns a unique serial number for each unit. The first two digits
indicate the month of production followed by two digits, indicating the
year of production. For example, serial number 0606 / 1234 describes a
unit manufactured in June of 2006 with a serial number 1234.
In its simplest configuration, a single-purpose float rides up and down
the sensor tube, totally surrounding it. A multi-purpose float may also
be used to activate the sensor, such a float being placed inside a liquid
isolation pipe, (i.e. Mag-Gage) and strategically located within a certain
longitudinal distance form the sensor tube. In either case, the float has
a somewhat lighter specific gravity than the liquid whose level is to be
measured, so that it is partially submerged at the interface of interest.
As the tank level changes, the float tracks the change 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 the liquid level in the tank.
SECTION 1. Transmitter Overview
1.0 General Description
1.1 Level Transmitter
The LTM-300 may be strapped to the side of the MagTech LG series
magnetic level indicator. In such an installation, it is used as an
accessory transmitter for the visual level gage. The same float used
to activate the magnetic gage is also used to transmit a signal to the
magnetostrictive sensor of the LTM-300.
1.2 Gage Mounted Transmitter
In the above right shown installations, the transmitters may be
calibrated for the same range as the visual indicator on the Mag-Gage,
or for part of the range (See Section 3).
LTM-300 Mounting Configuration
Style B & C LG Series Gage
When a companion magnetic gage is not present, the LTM-300 is
inserted into the tank with its own float around the sensor tube. A
stilling well may be optionally used inside the tank or, in case of high
temperatures; an external chamber may be the housing of the tube
and float assembly.
Note 1:
When a stilling well is used, care should be exercised when installing
the tube to center it in the chamber so that the float can freely travel the
entire length of the probe. Stilling wells are required for transmitters
over 10 feet.
Up to two floats may be used with the LTM-300. The second float
will typically sense the interface level of the heavier of the two fluids
in the tank. The specific gravity of the second float will be such that
it can be totally immersed in the lighter fluid.
Note 2:
When two floats are used, a minimum separation of about three inches
is recommended to prevent interference between floats.
1.3 Standalone Transmitter
The calibration range of the transmitter may be field stored in non-
volatile memory by using the float and push buttons. The push
buttons are located on the front panel inside the condulet. See
section on Calibration for more details
.
Single Float Transmitter
Dual Float Transmitter
1