• Which measuring principles are suitable for level detection?

    Here we explain the different measurement methods

Level Detection Measurement Method

Level detection is used to avoid overfilling or downtime in silos and containers.  Level limit switches are also used as spillage detectors in pipes or for the measurement of levels in interface applications.  The switching point depends on the installation position of the sensor and its configuration.  The information is analysed and transmitted via a digital signal to the control unit directly or via a fieldbus.  Other operations and alarms such as as a filling stop and start, or demand signal can thus be triggered.  Level switches are used in solids, liquids or sticky media.

Level detection / level detection using the rotation principle - rotary paddle switch

A motor-driven shaft causes a vane to rotate.  Once the material level reaches the vane, thereby preventing further rotation, a reaction torque is created which is converted into an electrical signal.  The motor is thereby turned off.   Once the measuring vane is no longer covered by material, a spring moves the motor back into its initial position, the signal is switched and the motor restarts.

The rotary paddle switch can be used in almost all bulk solids as level controllers and can be configured for use in extreme application conditions. The measuring principle is simple, durable, easy and offers the most cost-effective sensors.

Here you`ll find informations about the rotary paddle switch- Rotonivo®

 

Level detection / level detection using the vibration principle - vibrating fork / vibrating rod

Electronically stimulated piezos cause the probe to vibrate. If the probe is covered by material, the vibration is dampened and the resulting electrical current change causes the output signal to switch. Once the material level falls below the sensor, it is free to vibrate again and the output signal is reset.

Vibration sensors are very reliable limit indicators and offer high sensitivity for use in very light bulk solids as well as in standard applications. Commissioning is very simple and requires no calibration. The Vibration level detection systems are especially suitable within highly caking media or grain sizes over 10mm. UWT Vibrating probes are mainly used for bulk solids and paste-like media.

Video - The vibrating fork principle

Click here for information on the UWT vibrating fork - Vibranivo®

Click here for information on the UWT vibrating rod - Mononivo®

Level detection / Limit level measurement using the capacitive principle - capacitive sensor

The electrodes in the sensor make up a capacitor. The value of the capacitance of this capacitor is dependent on the geometry of the probe arm, the container and the dielectric value of the material to be measured by the probe. The integrated electronics evaluate the change in capacity and convert it to a switching signal.  In an uncovered state, the dielectric is air with a DK value of about 1 (reference).  In a covered state, the change in capacitance is dependent on the DK value of the medium being measured. The Capanivo probes always carry the same geometry within the boom, so no calibration is necessary. The RFnivo probes need to be calibrated for each container because of their flexible cantilever configuration. This is done automatically during the commissioning stage.

Capacitive measuring sensors are the all-rounder of the limit switches.  This is because they (the basic version) have the highest application performance. They can be used in extreme conditions in solids, liquids and viscous media and offer the widest range of applications. These sensors are limited only by media with a Dk value of less than 1.5 or a tendency to extreme caking, which cannot be offset by "Active Shield."

What is "Active Shield"? 

The Active-Shield technology prevents switching errors caused by caking / buildup on the probe. The Active Shield is located between the two capacitor probes of the boom (Active probe and ground probe) and forms, the same polarity to the active probe, an electromagnetic field to the mass flow meter. As such it constitutes a "protective shield" between the capacitorwhich prevents a change in capacitance with caking on the probe rod.  This ensures reliable measurement even in challenging conditions such as caking and build-up.

Click here for information on our capacitive level sensor RFnivo®

 

Level detection with Conductive Level Switches

The level of liquid is detected by the measurement of the conductivity using a conductive probe. The probe is mounted in the side of the container wall at the height of the filling level to be detected.  A low measuring circuit voltage is applied at the probe tip.  Once the probe comes into contact with the liquid the conductive circuit is completed via the metal container wall and a signal is sent.  By using alternating current, any corrosion of the probe and possible electrochemcial reactions are avoided.  

The Kondunivo from UWT is popular mainly because of its very robust design for use within building material applications, but also within many liquids and applications with viscous media.

Click here for information on our conductive level switch - Kondunivo®

Contact

UWT GmbH

Westendstr. 5
87488 Betzigau, Germany
infouwt.de

Tel: +49 831 571 23 - 0
Fax:+49 831 571 23 - 10

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You can also get in touch via our contact form.

UWT Locations

Our offices - worldwide

UWT worldwide

UWT GmbH - Level Control

The UWT Headquarter in Betzigau

Westendstr. 5
87488 Betzigau, Deutschland

Tel: +49 831 57123-0
Fax: +49 831-57123-10

Contact: Kevin Walter
E-Mail: kevin.walteruwt.de
Website: www.uwt.de 

Route Planner

Adpro-Instruments / Member of UWT Group

Foundation of a production plant in Malta

 

Second UWT production plant in:

Paola, Malta

UWT (UK) Ltd

Foundation of the sales subsidiary UWT (UK) Ltd.

20 Main Road, Dorrington
SY5 7JW, Shrewsbury, Shropshire, UK

Tel:  +44 1743 718883
Fax: +44 1743 718883

Contact: Graeme Hughes
E-Mail: graeme.hughes(at)uwtuk.com
Website: www.uwtuk.com

UWT Level Controls LLC

Foundation of the joint venture with "UWT LLC"

4445 Malone Road
P.O. Box 18769
38118, Memphis TN, USA

Contact: Arne Watland
Tel: +1 901 531 6090
Fax: +1 901 531 6095

E-Mail: infouwtlevel.com
Website: www.uwtlevel.com

UWT Level Control India Pvt. Ltd.

The subsidiary in India

Head Office:
UWT Level Control India Pvt. Ltd.
Plot No 52 Udyog Vihar Phase-VI
Sector 37 122001
Gurgaon, Haryana, India

Phone: +91 124 412 1600
Fax: +91 124 412 1611 

Homepage: www.uwt-india.com

Contact: Sumit Majumder
Country Manager
sumit.majumderuwt-india.com
Mobile: +91 9830879115

Communication:
Flat – 3B, 9 Majhipara Road
James Long Sarani
Kolkata – 700 063, India


North Regional Office:
UWT Level Control India Pvt Ltd.
Plot No 52 Udyog ViharPhase-VI
Sector 37 122001
Gurgaon, Haryana, India

Phone: +91 124 412 1600
Fax: +91 124 412 1611 

Contact: Prakhar Kapoor
Asst. Area Manager
prakhar.kapooruwt-india.com
Mobile: +91 971 721 3939

West Regional Office:
UWT Level Control India Pvt Ltd.
RK Plaza, Survey No. 206/3
Plot No. 17 Viman Nagar
Pune-411014, India

Phone: +91 202 674 1000
Fax: +91 202 674 1001 

Contact: Vikas Kirange 
Area Manager
vikas.kirangeuwt-india.com
Mobile: +91 8698904455 

East Regional Office:
UWT Level Control India Pvt. Ltd.
Flat – 3B, 9 Majhipara Road
James Long Sarani
Kolkata – 700 063, India

Contact: Sunirmal Bardhan
Regional Manager
sunirmal.bardhanuwt-india.com
Mobile: +91 9830400715

Central Regional Office:
UWT Level Control India Pvt. Ltd.
House No. 221, Rudralaya, (2nd Floor)
Sec – 1, Professor Colony, Near Sarvodaya High School
Raipur – 492001
Chhattisgarh, India

Contact: Mr. Shuvankar Das
Area Manager
shuvankar.dasuwt-india.com
Mobile: +917470775521

UWT RUS Level Measurement LLC

Foundation of the sales subsidiary UWT RUS Level Measurement

Dorozhnaya St., 8 b. 1, Of. K2-110
117545 Moskau
Russian Federation

Phone: +7 499 723-75-73

Contact: vasiliy.galaganuwtlevel.ru


Homepage: www.uwtlevel.ru

UWT International Trading (Shanghai) Co., Ltd.

UWT China moves into new premises

1st Floor, Plant No. 7,
Lane 333, Zhujian Road
Huacao Town, Minhang District
201107, Shanghai, China

Tel: +86 216 4684193
Fax: +86 216 4696707

Contact: Wei Gao
E-Mail: wei.gao(at)uwt.cn
Website: www.uwt.cn