Babbitt LS6000 Basic Features Sensor - Manual (Page 4)

2. THEORY OF OPERATION
The LS6000 employs a radio frequency (RF) balanced impedance bridge circuit to detect if the probe is in
contact with the material that is to be sensed.
When material is not in contact with the probe, the bridge is balanced by turning the adjustment pot to find the
threshold where the red led goes out.
When material is in contact with the probe, the bridge becomes unbalanced and the comparing circuit realizes
the change. This causes the relay to change state.
3. INSTALLATION
* CAUTION: ALL INSTALLATION AND WIRING MUST CONFORM TO NEC AND ALL OTHER
LOCAL ELECTRICAL CODES. TAKE SPECIAL CARE IN OBSERVING HAZARDOUS AREA
SAFETY PROCEDURES. WE ASSUME NO LIABILITY FOR IMPROPERLY INSTALLED OR
WIRED UNITS.
A. Inspection and Operation
After unpacking the LS6000, visually inspect the unit for any damages.
Please advise the factory or your local distributor of any damage.
Before installing the unit, a simple operational check can be performed.
On the bench, hook up the appropriate power to L1 and L2. The operating voltage of the LS6000 is marked on
the power supply board.
Hold the unit so that the probe is not touching any surface and touch the probe.
When you touch the probe, the red led should come on. This simulates product touching the probe.
B. Physical Installation
1) The LS6000 is installed into the vessel wall using a 1” NPT connection.
This can be either a threaded coupling or a tapped entry such as a flange.
2) The insulator should always extend at least 2” through the vessel wall.
3) Always check for physical room around the location you have chosen to allow for installation. Allow 3.25”
turning radius to screw the probe in and clearance above for the length of the probe.
4) CAUTION: Always take the necessary safety precautions when cutting or welding in the
coupling for the LS6000.
a) Tag and lock out the electrical power to the equipment that services the vessels.
b) Check liquid or dry powders that create a gas in the vessel for oxygen as well as the explosion factor.
(All dust will explode.)
c) Vessels that are cross vented have to be isolated.
5) Screw the LS6000 into the connection provided. In dry material application, no sealant on threads is
required. On liquid, teflon or a good pipe thread sealant may be used.
6) The LS6000 has a 1” NPT conduit entry. When wiring these units, conform to the National Electrical Code
and any other city or company codes.
7) Always install the electrical connection to the 1” NPT conduit entry so that water will not follow the
connection routing into the threads of the conduit hub. To guarantee that condensation and water will stay
outside the unit, install an EYSM unilet before each LS6000 and fill with explosion proof sealing cement.
8) When required, the LS6000 probe can be bent to meet your special application. Remember to allow 2” of
clearance between the probe and the vessel wall. If the probe is to be used in a pressure application, the
factory must bend the probe to your specifications.
9) Location of probes on high level installations is more critical on dry material than liquids. Note the
following:
a) For dry materials, mount the LS6000 in the top of the vessel whenever possible. (This allows you to
lengthen the probe if necessary.)
b) Avoid mounting the LS6000 near the product inlet, vent return lines, dust collectors and vessel
discharge openings on dry materials. Turbulence around these areas can cause erratic detection unless
the probe is long enough. On old installations it might be wise to fill the vessel first to determine the
length or location of the probe.
CAUTION: Always take safety precautions before opening
vessels for such inspection.
c) On gravity filled vessels, take into consideration the angle of repose formed by the product.
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