Proximity Switch And Sensor

• Inductive-Capacitive-Photoelectric-Magnetic Proximity Switches.
• Namur Sensors for Hazardous are application.
• Fiber Optic Sensors form Sick Optex Japan.
• LVDT
• Speed Sensors
• Reverse Rotation Sensor-Monitor

Capacitive Proximity Switch And Sensor: When the object enters in the sensing zone of the switch, capacitance between two plates of capacitor (one plate is represented by electrode at sensing face of the switch and another by all surrounding material which is connected to the earth) changes. As soon as capacitance value crosses preset level, oscillator starts. This change is detected and resulted in an output signal.

• Plasic
• Glass
• Ceramic
• Wood
• Leather
• Oil
• Diesel
• Water
• Metals

Capacitive Proximity Switch is a solid state device to sense position or level of any material.

Position Sensing : Plastic products, tablets, cardboard boxes, bottles.

Level Sensing : Solid, liquid, granules, flour.

Counting : No of bottles, boxes, pouches, etc.

Available Sizes: M 18 M 30 Ø 50 / M 48 MOUNTING

Sensing Distance in mm for object not connected to earth 3 20 30 Non Flush for object not connected to earth 2 10 15 Flush.

Above sensing distance relate to mild steel target. Apply following correction factor for object other than mild steel. Object Water PVC Glass Paper Oil.

Correction factor:- 1 0.6 0.5 0.2 0.2

SENSITIVITY ADJUSTMENT:

Capacitive Proximity Switch senses all metals and non-metals. The sensitivity of switch also depends on the surrounding environment. Therefore each switch is to be adjusted at the site to get best results. A muti turn potentiometer is to be adjusted to increase or decrease the sensitivity. Slowly turn the potentiometer clockwise to increase the sensitivity. Extreme sensitivity is achieved when load and ‘LED Lamp’ remains continuously ‘ON’ irrespective of object. This is maximum limit of the sensitivity.

Reduce the sensitivity by at least 2-3 turns than maximum value.

When switch is used for controlling level, sensitivity is to be set to minimum applicable so as to avoid false tripping by thin layer of powder deposited on the switch.

SAILENT FEATURES:

• Hysteresis : 5-20 % of set sensitivity
• Grade of protection : IP65 / IP67
• Enclosure : Metallic (Nickel-Chrome plated brass) / Stainless Steel / Plastic.
• LED Indication : Provided.

DC SWITCHES AC SWITCHES:-

• Supply Voltage : 10-30 V DC 90-230 V AC, 50Hz
• Protection : Short Circuit, wrong polarity protected protected against transients and voltage spikes
• Length : 100mm Max 100mm Max
• Ambient Temperature : 60 ºC Max 60 ºC Max
• Logic Available : NO / NC NO / NC
• Max Load Current : 200 MA 200 MA (min 30 MA)
• Switching Frequency : 100 Hz 1 Hz

Capacitive  plastic encl:

when the object enters in the sensing zone of the switch, capacitance between two plates of capacitor (one plate is represented by electrode at sensing face of the switch and another by all surrounding material which is connected to the earth) changes. As soon as capacitance value crosses preset level, oscillator starts. This change is detected and resulted in an output signal.

solid state sensor for:

• plasic
• glass
• ceramic
• wood
• leather
• oil
• diesel
• water
• metals

capacitive proximity switch is a solid state device to sense position or level of any material.

position sensing : plastic products, tablets, cardboard boxes, bottles.

level sensing : solid, liquid, granules, flour.

counting : no of bottles, boxes, pouches, etc.

available sizes m 18 m 30 ø 50 / m 48 mounting

sensing distance in mm for object not connected to earth 3 20 30 non flush for object not connected to earth 2 10 15 flush. Above sensing distance relate to mild steel target.

apply following correction factor for object other than mild steel.

object water pvc glass paper oil

correction factor 1 0. 6 0. 5 0. 2 0. 2

sensitivity adjustment:

capacitive proximity switch senses all metals and non-metals. The sensitivity of switch also depends on the surrounding environment. Therefore each switch is to be adjusted at the site to get best results. A muti turn potentiometer is to be adjusted to increase or decrease the sensitivity. Slowly turn the potentiometer clockwise to increase the sensitivity. Extreme sensitivity is achieved when load and ‘led lamp’ remains continuously ‘on’ irrespective of object. This is maximum limit of the sensitivity.

reduce the sensitivity by at least 2-3 turns than maximum value.

when switch is used for controlling level, sensitivity is to be set to minimum applicable so as to avoid false tripping by thin layer of powder deposited on the switch.

sailent features:

• hysteresis : 5-20 % of set sensitivity
• grade of protection : ip65 / ip67
• enclosure : metallic (nickel-chrome plated brass) / stainless steel / plastic.
• led indication : provided.

dc switches ac switches:-

• supply voltage : 10-30 v dc 90-230 v ac, 50hz
• protection : short circuit, wrong polarity protected protected against transients and voltage spikes
• length : 100mm max 100mm max
• ambient temperature : 60 ºc max 60 ºc max
• logic available : no / nc no / nc
• max load current : 200 ma 200 ma (min 30 ma)
• switching frequency : 100 hz 1 hz 

Photoelectric/ infrared optical proximity switch series OS

beam of invisible pulsed modulated infra-red light is produced by emitter. This beam is sensed by receiver at another end (in through beam version) or reflected by object and received by receiver placed near emitter (in diffuse version). When this beam is interrupted by object, the receiver signal gets changed and signal is produced.

optical proximity switches are used where higher sensing distance is required with non contact operation. The object can be sensed by three methods

Through beam type:

Transmitter and receiver are enclosed in two separate housings. When they are aligned, light beam travels from transmitter to receiver. Object breaking the light beam causes a change in the receiver. This change is detected and output signal is produced to drive external relay.

Retro reflective type:

Transmitter and receiver are housed in single housing and aligned with the reflector. The beam reflected by the reflector gets back to the receiver. Object breaking the light beam causes a change at the receiver. This change initiates an output signal.

Diffused reflective type:

This is a fixed focused type of switch. Transmitter and receiver enclosed in one housing. Transmitted beam strikes on the object (when the object enters the scanning range) and gets reflected by object surface. Receiver detects these rays and output signal is produced.

Special built in sensitivity adjustment tempot is incorporated to adjust required sensitivity at the site

Colour mark sensor:

These are used to sense dark colour marks on packaging material. Transmitter and receiver are housed in single housing and beam is focused to a spot. In normal condition receiver receives reflected light. When dark register mark is entered, the receiver senses change in signal level. Thus output signal is initiated.

a special modulating circuit is developed and used in all powertech optical sensors to make them unique for working in adverse atmospheric conditions.

Optical proximity system:

type ops-s consists of separate transmitter, receiver and amplifier relay unit. Supply to the amplifier unit is 24 v dc / 240 v ac. A potentiometer to increase decrease sensitivity. Selector switch to amplify gain (sensitivity) by 60, 100% and a timer potentiometer to adjust on delay / off delay up to 1 minute are built in features. A relay is activated having contact rating of 2 a resistive at 240 v ac. 50 hz

Technical specification:-

Supply voltage: 10-30 vdc 10-30 vdc 10-30 vdc 230 vac

Size / sensing range m 18 : 1mtr. M 18 : 1mtr. M 18 : 100mm transmitter m 12 m 30 : up to 5 mtr. M 30 : up to 5 mtr. M 30 : up to 1000mm receiver

Rectangular rectangular rectangular amplifier unit : panel

mounting / rail mounted.

Degree of protection ip65 ip65 ip65 tr/rec : ip67

Amplifier ip30 max load current 150 ma 150 ma 150 ma 2a resistive at 240 v ac

max operating frequency 100 hz 100 hz 100 hz 10 hz output logic no or nc no or nc no or nc 2 c/o contacts load connection npn npn npn pnp pnp pnp

on / off delay time range -- -- -- 0-1 minute adjustable

Correction factor for various objects:-

material white paper black anodized alu metal glossy pvc wood

factor 1 1. 1 to 1. 5 1. 1 to 1. 6 0. 5 0. 4