BABBITT LS7000, Руководство пользователя

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www.babbittinternational.com Reference Manual
2021
6
2. THEORY OF OPERATION
The LS7000 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
3.1 Inspection
Carefully unpack the LS7000 from the shipping box and check each item against the packing list before
destroying any packing material. Visually inspect for any damage that may have occurred during shipping.
Please advise the factory or your local distributor of any damage.
3.2 Bench Test
*THIS IS AN EXCELLENT TIME TO BECOME FAMILIAR WITH THE TIME DELAY IF IT IS TO
BE USED IN YOUR APPLICATION. (See calibration instructions, section 4.1 and 4.2)
On the bench, hook up the appropriate power to L1 and L2. The operating voltage of the LS7000 is
marked on the power supply board. Hold the unit so that nothing is touching any surface and press the test
switch. When the test switch is depressed, the red led should come on. This simulates product touching the
probe. If a timing mode has been selected it will operate as if installed.
NOTE: The timing mode can be adjusted when checking the unit, but the sensitivity adjustment
MUST BE MADE AFTER the unit is installed where it will be used.
3.3 Physical Installation
1) The LS7000 is installed into the vessel wall using a 1” NPT process 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.
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.