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L21/3 dial type| Emko
meter s.r.o., Na Žižkově 1245, 58401 Ledeč n/S., Czech Republic
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Measurement and Regulation
EMKOMETER Ltd.
Operating instructions
Liquid level sensor
Ledec nad Sazavou
Series L21/3-DIAL-xx.xx.xx
Contents:
1. MEASUREMENT PRINCIPLE AND APPLICATIONS
2. DESCRIPTION
3. OPERATING CONDITIONS
4. SPECIFICATION
5. OTHER DATA
6. STORAGE, DELIVERY AND TRANSPORT
7. INSTALLATION / ADJUSTMENT OF MECHANICAL PARTS, COMMISSIONING
8. SETTING THE ELECTRICAL PARTS, MAINTENANCE
9. TABLE OF FLOAT SENSORS
10. QUALITY WARRANTY
11. OTHER INFORMATION REQUIRED FOR PRODUCTION AND SETTING-UP
1. Principle and Applications
1.1 Principle
The float sensor consists of a head, neck, wire and a float. Optionally float is coupled to the wire via
magnetic follower over guide tube. The liquid level is measured by the float that moves freely along the
tube, actuating the follower via a magnetic coupling. The magnetic coupling consists of magnets placed
in the float and in the follower. In the case of turbulent levels, extreme temperatures etc., a follower with
a more powerful magnetic coupling is used. The follower located in the guide tube is connected to the
instrument head by stainless-steel wire. The follower moves through the magnetic field, transmitting the
liquid level movement to the instrument head. In simple applications with noncorosive liquids directly
connected float is used. The transmission mechanism indicates instantaneous liquid levels on a circular
scale, or it controls liquid levels at the desired height by means of the LG
´s electronic equipment. Using
a resistance transmitter or a transmitter with a potentiometer, it provides an impedance signal or a
current output signal.
1.2 Use
Float sensors (hereinafter FS) are designed to measure and control liquid levels in closed and open
tanks or in pressure tanks. Some types of instruments, designed and marked for explosion-free
atmospheres, can also be used to measure various media in Zone 0. IP 65 allows for safe
measurements in the amospheres with aggressive substances. The level gauge is a mechanical-
electrical device whose modular construction allows you to create various instruments with different
features.
Types of level gauges and their combinations
LG head (basic information)
