Babbitt LS8000 User Manual

LLSS88000000 LLEEVVEELL SSWWIITTCCHH

OWNERS MANUAL

♦♦IINNSSTTAALLLLAATTIIOONN
♦♦CCAALLIIBBRRAATTIIOONN
♦♦TTRROOUUBBLLEESSHHOOOOTTIINNG
♦♦WWAARRRRAANNTTY

BABBITT

Page

INTERNATIONAL, INC.

1. Description-------------------------------------------------------------------1

TABLE OF CONTENTS

Y

G

P.O. Box 70094
Houston, Texas 77270
[phone]

TABLE OF CONTENTS

1. Description ----------------------------------------------------- 1

A. General Description ----------------------------------- 1

B. Specifications -------------------------------------------- 1

2. Theory of Operation/ Ordering Information ----------------- 2

3. Installation ----------------------------------------------------- 2

A. Inspection ----------------------------------------------------- 2

B. Physical Installation of Probe ----------------------------------- 2

C. Installing the Receiver ----------------------------------- 3

D. Typical Applications and Wiring Diagrams ----------------- 4

1) LS8000 Terminal Layout ----------------------------------- 4

2) Ladder Diagrams -------------------------------------------- 6

4. Calibration -------------------------------------------------------------- 10

A. Setting the Time Delay ----------------------------------- 10

B. Fail Safe Selection -------------------------------------------- 10

Page

C. Sensitivity Calibration ----------------------------------- 10

5. Maintenance and Troubleshooting ----------------------------------- 11

6. Warranty -------------------------------------------------------------- 12

LS8000 LEVEL SWITCH

1. DESCRIPTION

A. General Description

The LS8000 is a point level switch that detects the presence or absence of material in a bin, silo, tank or other
container.
The basic unit is made up of a solid stainless steel probe attached to an explosion proof housing. Inside the
explosion proof housing is a transmitter that is connected to the receiver board by a twisted, shielded pair of
wires.
The receiver board may be mounted up to one mile from the probe. All calibration adjustments and indicators
are at the receiver. The receiver also has the relay output and an on board fuse.
The unit is calibrated in the absence of material and an on board relay at the receiver changes state when
material is detected.

B. Specifications

Electrical

Power:

(12 VDC, 24 VDC or 230 VAC optional)

115 VAC (±15%) 50/60 Hz. 2 watts, standard.

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: Transmitter: Class I- Group C, D

Class II- Group E, F, G

Receiver: Open printed circuit board can be put in

enclosure as required by application

Temperature: Probe: -30° F to 400° F

Electronics: -40° F to 185° F

Pressure: Probe: 1500 psi @ 75° F. Higher ranges available

upon request.

Construction: Probe: All wetted parts, 316 SS Teflon and Viton.

A Halar coating can be applied to the probe when
applicable.
Transmitter: Housed in cast aluminum explosion

proof enclosure
Receiver: Printed circuit board mounted on plastic
track provided with each unit.

Specifications subject to change without notice.

1

C. Ordering Information

2. THEORY OF OPERATION

The LS8000 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

After unpacking the LS8000, visually inspect the unit for any damages.
Please advise the factory or your local distributor of any damage.

A complete unit should consist of the following:

1. An explosion proof enclosure with probe attached

2. A transmitter module in the explosion proof enclosure

3. The LS8000/R receiver card

4. A plastic snaptrack to mount the receiver card

B. PHYSICAL INSTALLATION OF TRANSMITTER MODULE AND PROBE

1) The LS8000 is installed into the vessel wall using a ¾” NPT connection.
This can be either a threaded coupling or a tapped entry such as a flange.

2) The teflon 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 2 ¾”
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 LS8000.

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 LS8000 into the connection provided. In dry material application, no sealant on threads is
required. In liquid, teflon or a good pipe thread sealant may be used.

2

6) The LS8000 has a ¾” 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 into the ¾” NPT on the LS8000 so water will not follow the
connection routing into the threads of the ¾” NPT
outside the unit, install an EYSM unilet before each LS8000 and fill with explosion proof sealing cement.

8) When required, the LS8000 probe can be bent to meet your special application. Remember to allow 2” of
clearance between the probe and 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 LS8000 in the top of the vessel whenever possible. (This allows you to

lengthen the probe if necessary.)

b) Avoid mounting the LS8000 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. We recommend a 36” top mounted high level probe in storage silos
and a 24” in smaller vessels such as use bins.

CAUTION: Always take safety precautions before opening vessels for such

c) On gravity filled vessels, take into consideration the angle of repose formed by the product.
d) On dry product that flows like water (starch), when using the LS8000 to stop the flow by means of a

butterfly valve or knifegate, make sure the probe is long enough to allow time to close these slow
moving valves.

e) In small vessels where a good location is hard to find, it may be

the probe and the product inlet to keep product off of the probe as it fills.
(A short time delay could also solve this problem.)

C. Installing the Receiver

hub. To guarantee that condensation and water will stay

vessel wall. If the probe is to be used in a pressure application, the

inspection.

necessary to put a baffle plate between

The receiver is a printed circuit board measuring 3” x 4 ½“. It is mounted in a plastic snap track that is
provided with each unit.
The snap track can be mounted in existing control panels or enclosures may be ordered from the factory.

1) Attach the snap track to the panel back pan or other surface using 2 small screws or a suitable adhesive.

2) Snap the LS8000/R receiver card into the snap track.

3) Connect shielded cable to the 3 terminals marked G,S, +. (See page 5

4) Connect the proper supply voltage and relay output wiring for your application. (See page 4)

NOTE: All wiring must conform to the National Electric Code or other enforcing authorities that

apply in your area.

D. Typical Applications and Wiring Diagrams Follow:

3

for wiring diagram.)