Omega LV850 User Manual

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User’s Guide

LV850

Level Sensor

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

LV850 LEVEL SENSOR

i

Please follow these installation, connection and adjustment instructions
carefully. Failure to comply with these instructions or misuse of this
equipment will void your warranty.

Equipment installation, connection and adjustment by qualified

personnel only!

LV850 LEVEL SENSOR

NOTES:

ii

LV850 LEVEL SENSOR

1 Description

Level Sensor LV850 is suitable for liquids with low relative dielectric constant

ε

r

(e.g. oil). Units come with Minimum and Maximum selector switch.

It operates on the principle of electrical capacitance changes arising when an
electrode surrounded by air is immersed in the medium.

• LED status display

• Selection of minimum and maximum function by changeover switch.

Minimum switching

Normally the sensor is immersed and the green LED indicates. As the level
drops below the sensor the green LED extinguishes.

Maximum switching

Normally the sensor is not immersed and the green LED indicates. As the
level rises above the sensor the green LED extinguishes.

• In the event of a short-circuit in the load circuit, the green LED will
extinguish and the red LED will flash.

1

LV850 LEVEL SENSOR

2 Technical Data

Temperature range -20°C to +130 °C

(-4°F to +266°F)

short-time to +150°C

(+302°F)

Ambient temperature -20°C to +85°C

(-4°F to +185°F)

Pressure resistance max. 25 bar (367.5 PSI)

Response delay approx. 0.1 s

Degree of protection IP 65

Input voltage DC 9 ... 36 V

Option:

- metal coupling for pipe extension (see fig. 2) if the sensor is to be used as an

immersion sensor

mark to demonstrate compliance with applicable directive

2

LV850 LEVEL SENSOR

3 Level Sensor Installation

The Level Sensor may be installed in any attitude.

1. Ensure sufficient clearance space (see Fig. 1) in the container wall.

• Ensure a type 3/4" NPT or G3/4A thread in the container wall has been
provided.

2. Screw the Level Sensor into the threaded aperture using a recognized
sealing material.

3. When tightening the level sensor please use the flats provided (SW32).

Do not overtighten.

CAUTION

NOTE

3

LV850 LEVEL SENSOR

4 Connection

Check that the supply voltage corresponds with the voltage
rating shown on the system.

1. Loosen the gland (PG7)(see Fig. 1).

2. Unscrew the cover of the housing (C).

3. Feed the supply cable through the gland (PG7) and the cover (C), or
through the metal coupling supplied as option (see Fig. 2).

4. Connect the cable to the terminal block (TB) (see Fig. 3).

5. Set selector switch (S) to minimum or maximum:

1. - minimum

2. - maximum

6. Connect the supply voltage. LED (red) indicates.

CAUTION

4

LV850 LEVEL SENSOR

7. Increase the level until the Level Sensor is immersed in the medium.

8. Minimum Sensor:

• Turn the potentiometer screw (E) to (-) until the LED (green) extinguishes.
Then slowly turn to (+) until the LED indicates. Adjust the screw a further
full turn to (+) to compensate for any tolerance.

9. Maximum Sensor:

• Turn the potentiometer screw (E) to (+) until the LED (green) extinguishes.
Then slowly turn to (-) until the LED indicates. Adjust the screw a further
full turn to (-) to compensate for any tolerance.

10. Replace and tighten the cover (C) or the metal coupling (option).

11. Replace and tighten the cable gland nut (PG7).

The Level Sensor is now connected, adjusted and ready for operation.

5 Operating Difficulties

Problem: The Level Sensor fails to operate correctly.

Solution:

- The surface of the sensor probe should be carefully cleaned from inside the
container.

5

LV850 LEVEL SENSOR

NOTES:

6

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover
handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be
repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This
WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence
of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibra­tion; improper specification; misapplication; misuse or other operating conditions outside of
OMEGA’s control. Components which wear are not warranted, including but not limited to
contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with information
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER
WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth
herein are exclusive, and the total liability of OMEGA with respect to this order, whether
based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall
not exceed the purchase price of the component upon which liability is based. In no event
shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY/ DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST

of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2004 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

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