BABBITT LS7500 Manuale utente
www.babbittinternational.com Reference Manual
2020 Rev.2
LS7500 Presence/Absence Switch
OWNERS MANUAL
♦INSTALLATION
♦CALIBRATION
♦TROUBLESHOOTING
♦WARRANTY
P.O. Box 70094
Houston, TX 77270
(713) 467-4438
www.babbittinternational.com Reference Manual
2020 Rev.2
Read this manual before working with the product. For personal and system safety, and for optimum product
performance, make sure that you thoroughly understand the contents before installing, using or maintaining this
product.
For equipment service or support needs:
Customer Service: 1-800-835-8012 or 713-467-4438 (8:00 a.m. to 5:00 p.m. CST US)
Failure to follow safe installation and servicing guidelines could result in death or serious injury.
Make sure only qualified personnel perform the installation.
Use the equipment only as specified in this manual. Failure to do so may impair the protection provided by the
equipment.
Do not perform any services other than those contained in this manual unless you are qualified.
Explosions could result in death or serious injury.
Verify the operating environment of the Babbitt LS7500 Presence/Absence switch is consistent with the
appropriate location certifications.
Do not remove the housing cover in explosive atmospheres when the circuit is alive.
To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing.
High voltage that may be present on leads could cause electrical shock.
Make sure the main power to the Babbitt LS7500 Presence/Absence switch is off and the lines to any other external
power source are disconnected or not powered while wiring the instrument.
WARNING
NOTICE
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2020 Rev.2
TABLE OF CONTENTS
Page
1. Description ------------------------------------------------------------------ 1
A. General Description --------------------------------------------- 1
B. Specifications -----------------------------------------------------1
C. Ordering Information---------------------------------------------1
2. Theory of Operation -------------------------------------------------------3
3. Installation-------------------------------------------------------------------3
A. Inspection and Operation Check ------------------------------- 3
B. Physical Installation ----------------------------------------------3
C. Removing Electronics -------------------------------------------- 4
D. Typical Applications and Wiring Diagrams -------------------4
1) LS7500 Terminal Layout --------------------------------4
2) Ladder Diagrams -------------------------------------- 6-7
4. Calibration -------------------------------------------------------------------8
A. Setting the Time Delay ------------------------------------------ 8
B. Fail Safe Selection ------------------------------------------------8
C. Sensitivity Calibration ------------------------------------------- 9
5. Maintenance and Troubleshooting --------------------------------------10
6. Warranty ------------------------------------------------------------------- 11
www.babbittinternational.com Reference Manual
2020 Rev.2
LS7500 PRESENCE/ABSENSE SWITCH
1. DESCRIPTION
A. General Description
The LS7500 is a level switch that detects the presence or absence of material in a pipe. The basic unit is
made up of a solid stainless steel flange attached to an explosion proof housing. Inside the explosion proof
housing are all calibration adjustments and sensing electronics. The unit is calibrated in the absence of
material and an internal relay changes state when material is detected.
B. Specifications
Electrical
Power: 115 VAC (±15%) 50/60 Hz. 2 watts, standard.
(12 VDC, 24 VDC or 230 VAC optional)
Output: 2 Form C contacts, DPDT relay, 5 amp resistive
At 125, 250 VAC; 30 VDC
Fuse: On board, 250 mA @ 125 volts
Fail Safe: Selectable high or low level
Time Delay: Selectable: ON or OFF delay
Adjustable: 1/8 sec to 2 hrs.
RF Frequency: Approximately 1.3 MHz
Environmental
Hazardous Area: Housing is CSA and UL approved for Class I, Div. 1, Groups C & D; Class II,
Groups E, F & G
Temperature: Probe: -30° F to 180° F **
Electronics:-40° F to 185° F **
Pressure: Probe: 200 psi @ 75° F**
(**Higher ranges available, consult factory)
Construction: Flange: All wetted parts, 316 SS Teflon (or UHMWPE) and Viton.
A Halar coating can be applied to the flange when applicable.
Electronics: Housed in cast aluminum explosion proof enclosure.
Specifications subject to change without notice.
C. Ordering Information
LS7500 - 115VAC - FP - 4” 150# -PR
Model #
(LS7500)
Power Supply:
(115VAC 24VDC 12VDC or 220VAC)
Sensor Type:
(FP-Flange Probe or TC-Tri-Clamp)
Sensor Size:
Flange Model:
(PR-Partial Ring or FR-Full Ring) 1
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2020 Rev.2
2
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2020 Rev.2
2. THEORY OF OPERATION
The LS7500 employs a radio frequency (RF) balanced impedance bridge circuit to detect if the sensing
element is in contact with the material that is to be sensed. When material is not in contact with the sensing
element, 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 sensing element, the bridge becomes unbalanced and the comparing
circuit realizes the change. This causes the relay to change state.
3. INSTALLATION
A. Inspection and Operation
After unpacking the LS7500, 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.
*THIS IS AN EXCELLENT TIME TO SET THE TIME DELAY IF IT IS TO BE USED IN YOUR
APPLICATION. (See calibration instructions, section 4, A)
On the bench, hook up the appropriate power to L1 and L2. The operating voltage of the LS7500 is
marked on the power supply board. Hold the unit so that the probe is not 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.
B. Physical Installation
1) The LS7500 is installed into the piping wall using a flange.
2) CAUTION: Always take the necessary safety precautions when cutting or welding in the
coupling for the LS7500.
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.
3) Tighten the LS7500 into place using proper gaskets and sufficient torque to prevent leaks.
4) The LS7500 has a 1” NPT conduit entry. When wiring these units, conform to the National Electrical
Code and any other city or company codes.
5) Always install the electrical connection into the 1” NPT on the LS7500 so water will not follow the
connection routing into the threads of the 1” NPT hub. To guarantee that condensation and water will
stay outside the unit, install an EYSM unilet before each LS7500 and fill with explosion proof sealing
cement.
3
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.
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2020 Rev.2
C. Removing the Electronics
1) To remove the sensing card, simply unplug it from the power supply card. When reinstalling, this card
is made so that it cannot be plugged in backwards.
2) To remove the power supply card you must:
a) Disconnect supply power at main power source.
b) Remove sensing card.
c) Disconnect wires from terminal strip.
d) Remove green grounding screw.
e) Unplug blue antenna lead.
f) Hold the top of the card guide and lift out
NOTE: LS7000 AND LS7500 ELECTRONIC COMPONENTS ARE INTERCHANGABLE.
D. Typical Applications and Wiring Diagrams
LS7500 TERMINAL LAYOUT
*NOTE: EACH LS7500 POWER SUPPLY IS INTENDED FOR ONLY ONE SUPPLY VOLTAGE. THIS
VOLTAGE IS PRINTED ON THE POWER SUPPLY BOARD. FOR 115 VAC OR 230 VAC UNITS, HOOK UP THE
HOT LEAD TO L1 AND THE NEUTRAL TO L2, WITH APPROPRIATE GROUND. FOR 12 VDC OR 24 VDC
UNITS, HOOK THE POSITIVE VOLTAGE TO L1 AND THE COMMON OR GROUND TO L2.
4
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2020 Rev.2
NOTE: LS7000 AND LS7500 ELECTRONIC COMPONENTS ARE INTERCHANGABLE.
5
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2020 Rev.2
6
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2020 Rev.2
7
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