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All MagTech products are warranted against defects in materials
and workmanship of one year from date of shipment. The level
gage chamber and process connections are guaranteed for the life
of the tank or vessel to which it is attached. Floats are guaranteed
for two years. MagTech will repair or replace at its discretion
those products that fail to perform as specified, with the following
exceptions:
1. Products repaired or modified by persons that are not
authorized by MagTech.
2. Products subjected to misuse, negligence or accidents.
3. Products that are connected, installed, or otherwise used
in such a way not in strict accordance with manufacturer’s
instructions.
This warranty is in lieu of any other warranty expressed or implied
by any party other than MagTech. Repairs and/or replacements
shall be at the sole discretion of MagTech based on the terms and
conditions of this warranty. Defective products shall be returned
to the factory prepaid by the buyer after obtaining a Return
Authorization Number from MagTech. All warranty repairs or
replacements will be preformed at the factory in Houston. Surface
return freight will be paid by MagTech. Factory warranties do not
include field service. Field service warranty repairs will be at
the buyer’s expense. Consult MagTech for field service rates.
Any modifications to terms and conditions of this warranty will not
be binding unless made in writing and signed by an authorized
agent or official of MagTech.
NOTE: ALL MAGTECH GAGES SHOULD BE UNPACKED
AND THOROUGHLY INSPECTED UPON RECEIPT. GAGES
ARE SHIPPED FOB FACTORY AND ARE FULLY PROTECTED
AGAINST DAMAGE OR LOSS DURING SHIPMENT. ANY
CLAIMS FOR PARTS DAMAGED DURING SHIPMENT SHOULD
BE SUBMITTED WITHIN 15 DAYS OF RECEIPT OF GOODS BY
CUSTOMER.
5. If no float is present, or magnetic field is lost, HART
Communicator will display “LEVEL SIGNAL LOST”
6. For calibration using HART, or to change range consult HART
section of this manual.
Note: During the installation or calibration of the LTM-300 level
transmitter, the technician should be very careful not to move
the magnet perpendicular to the sensor tube 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 inductor emits
a magnetic filed as current passes through the sensor wire. If an
external magnet or the float comes in contact with the bulkhead,
this can cause temporary magnetization of the coil, which means
the coil is biased. In other words, the phase is reversed. If this
occurs, the inductor should quickly recover. It may be manually
reversed or de-magnetized very simply by “swiping” a magnet
parallel to the bulkhead in an arching motion.
Note: In service over 400 Deg F (204C) Gages and
Transmitters should be properly insulated with
transmitter OUTSIDE the blanket.
We strongly recommend that experienced MagTech personnel do
any insulation of the magnetic level gages with externally mounted
transmitters.
If Cryogenic “Hard Skin” cold service type insulation is required, it
MUST be done at the factory due to the custom “TUBE in TUBE:
design necessary for removal of the transmitter if needed.
If insulation is going to be done in the field, then the following
guidelines MUST be followed:
1. Flexible type insulation jackets (NOT HARD SKIN) are required
and must be installed around the Mag-Gage chamber only.
DO NOT cover the LTM 300 transmitter tube, as this may burn
up the sensor and possibly the electronics.
2. After the insulation jacket is installed, the LTM 300 sensor tube
must be re-mounted at its factory-preset distance from the
Mag-Gage chamber and must be parallel to the chamber as
well. (Small cut-outs in the jacket are required to re-attach the
transmitter properly).
3. Make sure the 4mA markings on the sensor tube are re-aligned
at the centers of the process connections.
SECTION 7. Field Insulation of Gages
with Transmitters
7.0 Field Insulation
7.1 Insulation Warning Label Supplied
MagTech Level Transmitters have a maximum operating
temperature of 300°F. When insulating a Mag Gage and
transmitter assembly in HOT service, keep the transmitter
OUTSIDE the insulating material. Special blankets for this
type of insulation are available from MagTech. For further
information consult the factory. 1-800-221-3653
----------WARNING---------
(When Insulating Gages)
SECTION 8. Warranty and HART Protocol
8.0 Warranty
7