Level Switching PPT

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“LEVEL SWITCHING”FROM:-29TH MAY to 11TH July 2012

By Sameer Gupta

B.TECH (ECE)2010 to 2014

HINDUSTAN ZINC LIMITED

Department of Electronics & Communication Engineering

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Index

1. HZL Introduction

2. Mission of HZL

3. Introduction of level switch

4. Block diagram

5. Low and high level control

6. min/ max level control

7. Conclusion

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There are many places in our country, where we get different types of metallic substances as raw material for industries. In these substances, the metals are present in compound form. These substances are called as minerals. Minerals are mostly present as oxides, sulphides, carbonates, chlorides and silicates. Those minerals from which we can get the metals conveniently and at low cost are called ores.

Zinc is mainly obtained from its ore Zincs Blende (ZnS) available mainly in the states Rajasthan and Orissa.

HZL INTRODUCTION

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mines

Jawar maines

Rajpura debari mines

Manton rock

phosphate mines

Rampura agoocha

mines

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Chanderia Lead Zinc Smelter

smelters

Debari Lead Zinc Smelter

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Uses of Zinc

1. Zinc Powder 2. Bras Items 3. GI pipes 4. CuSO4 

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Production Capacities

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MISSION OF HZL

1. Be a lowest cost zinc producer on a global scale, maintaining market leadership. 2. One million tone zinc-lead metal capacity by 2015. 3. Be innovative, customer oriented and eco-friendly, maximizing stake-holder value. 4. Refined zinc production capacity 69,000 tons per annum. 5. Refined lead production capacity 85,000 tons per annum.

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Process Of Making Zinc

In the Hindustan zinc debari there are two types of smelting process. Pyro Metallurgy Hydro Metallurgy

But it use the mainly Hydro Metallurgy.

Hydro Metallurgy consists 5 steps for refining of zinc and by product.Hydro Metallurgy have following 5 steps:-

Roasting Leaching Purification Electrolysis Melting And Casting

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Level Switch

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In the mining process we have to control the level of liquid. Suppose the calcine is flowing through the pipe to the a big container we have to use level switch. In the process there are many type of level switch as follow:- Capacitance Type Level Switch Conductivity Type Level Switch Radar Level Sensor Ultrasonic Level Sensor

In the Hindustan zinc debari we use conductivity level switch. It is use for controlling the level of liquid. For this we use the series TEL-280.

Introduction (Level Switch)

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• The series ‘280’ Electronics level switches are point level indicators which indicates the presence of, absence of conductive media when media come to contact with electrodes. These are basically available in three types.

• Low Level indicating Type• High level indicating Type• Min/Max Level control Type • These Level switches generate signal utilizing the

media’s conductivity property. So these switches are suited for only conducive medias.

TEL -280 LEVEL SWITCH

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BLOCK DIAGRAM

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Description

• TEL -280 electronics consist of two PCBs. The first PCB contain :-power supply circuits, Relay, relay driving cuts. A terminal strip for input/Output connections

are also provided on this board.

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The second PCB consists:- amplifier, time delay cuts The A.C. current through the media in between the probes in

amplified by the amplifier and drives the time delay circuits, and finally the relay. Sensitivity present potentiometer is in corporporated to suit the switch to medias of different conductivities.

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LOW OR HIGH LEVEL CONTROL

• For Control of LOW Or HIGH liquid level TEL-280 utilize two electrode probe.

• The bigger of the two electrodes is called common electrode.

• To avoid of the relay due turbulent fluid, a time delay CKT is incorporated.

• For high level detection, relay will be energized when fluid reaches the high level.

• for low liquid level, relay will be de-energised when fluid reaches the Low level.

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MIN/MAX LEVEL CONTROL

• For control of preselected MIN/MAX (L0/HI) liquid level.TEL-280 utilizes three electrode probes.

• They are common, LOW and HIGH electrode and their lengths are in above order.

• The difference between high and low (MAX and MIN) can be as a low 10 mm and may be as a several meters.

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PROPERTIES OF LEVEL SWITCH

Suitable for switching at different levels. No moving parts, so free from maintenance. Not affected by material build up on the probe. Selectable HIGH/LOW level alarm. Adjustable sensitivity.

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Level Sensors Manufacturers

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THANK YOU

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