Capacitive Proximity Sensors Non-contact detection non-metallic materi
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Capacitive Proximity Sensors
Capacitive Proximity Sensors Non-contact detection non-metallic materials
Capacitive Proximity Sensors
Dielectric Principle
Product Overview
Nominal Sensing Distance Correction Factors sensing distances listed specifications based upon ferrous metal target medium 60947-52. Other materials often require correction factor that reduces actual sensing distance. Material Metals Water Beer Alcohol Wood Glass Ceramics Lubricating Correction Factor 0.9.1.0 0.2.0.7 depending moisture content
electric field between sensor surroundings. Changes capacitance this circuit detected sensor. Advantages Detect conductive non-conductive materials
Target detection affected color Adjustable sensitivity potentiometer allows differentiation between materials, ability "tune out" mounting hardware intermediate barrier materials.
Product Variety Features 3-wire 2-wire operation
short circuit, overload, polarity reversal protection cable-out quick disconnect
Humidity Moisture
10mm, M12, M18,
20mm, M30,
34mm tubular past, switchpoint capacitive sensors could affected level humidity air. Today, modern circuits have eliminated ambient humidity problem capacitive sensors. Changes moisture content absorptive hygroscopic target materials, however, affect switchpoint capacitive sensor. Often this desirable feature monitoring moisture content. not, sensor must tuned widest range target material moisture content expected.
types 50mm flat round style plastic metal housings analog output model static electricity-resistant model programmable PNP/NPN NO/NC model
Applications level detection granules, powders, liquids contents detection through non-metallic containers moisture content area detection bottle, package, carton counting bottle, package, carton contents confirmation bottle detection rubber O-ring seal presence confirmation band loop control belt breakage indication foodstuffs industry confectionery flour plastics industry material pellets regrind wire break detection small parts counting Special Types about availability special types, such Teflon housings semiconductor chemical processing industries. Teflon resists attack from aggressive solvents such de-ionized water concentrated sulfuric acid fumes.
Capacitive Proximity Sensors
Applications
Inspect package contents. Confirmation liquid level.
Checking filter tobacco presence cigarettes.
Level control non-metallic containers. Check missing label backing material. Following metal thread textiles.
Detecting, counting objects.
Inspecting paper plastic strips.
Level control monitoring sight glass.
Sensing presence thickness lumber.
Packaging-confirmation product presence.
sure metal behind target object.
Capacitive Proximity Sensors
3-wire 0.4,
Housing size Mounting Effective operating distance Assured operating distance
flush adj. 0.2.9 adj.
flush adj. 0.2.9 adj.
non-flush adj. 0.5.8 adj.
flush adj. 0.3.2 adj.
M12x1
(pending)
2000
Normally-open Normally-closed Complementary Normally-open Normally-closed Complementary
BCS-010-PSB-1-L-1 BCS-010-POB-1-L-1,2
BCS-012-PSB-1-L-S4 BCS-012-POB-1-L-S42
BCS-012-PS-1-L-S4 BCS-012-PO-1-L-S42
BCS-012-PS-1-Y- BCS-012-PO-1-Y-
BCS-010-NSB-1-L-1,2 BCS-010-NOB-1-L-1,2
BCS-012-NSB-1-L-S42 BCS-012-NOB-1-L-S42
BCS-012-NS-1-L-S4 BCS-012-NO-1-L-S42
BCS-012-NS-1-Y- BCS-012-NO-1-Y-
Rated operational voltage Supply voltage Voltage drop Insulation voltage rating Rated operational current Minimum operating current No-load current draw Leakage current, output Protected against short circuit Protected against polarity reveral Load capacitance Repeat accuracy Ambient temperature range Switching frequency, Utilization categories display Degree protection 60529 Housing material Sensing face material Connection wires gauge
15.30 -30.+70°C output stainless steel PTFE cable
15.30 -30.+70°C output nickel-plated brass PTFE micro
15.30 -30.+70°C output nickel-plated brass PTFE micro
15.30 -30.+70°C output nickel-plated brass PTFE cable
suffix cable material length. Example meters, PU-05 meters Consult factory availability Part number will transition from during 2001 models have thermal SCP. models have pulsing SCP. outputs Connect load supply PNP, supply
Capacitive Proximity Sensors
flush adj. 0.3.2 adj.
M12x1
3-wire M12, 0.4, 1.10, 1.12
non-flush 1.10 adj. 0.8.8.1 adj.
non-flush 1.10 adj. 0.8.8.1 adj.
non-flush 1.12 adj. 0.8.9.7 adj.
non-flush 1.12 adj. 0.8.9.7 adj.
BCS-012-PS-L-1-Y- BCS-012-PO-L-1-Y-
BCS-012-NS-L-1-Y- BCS-012-NO-L-1-Y-
15.30 -30.+70°C output nickel-plated brass PTFE cable Approvals:
60947-5-2 (pending) C22.2 14-M91 (pending) NEMA 5-1996
2000
BCS-018-PS-1-C-S43 BCS-018-PO-1-C-S4
BCS-018-PS-1-C-1,3 BCS-018-PO-1-C-1,
BCS-020-PS-1-C-S4 BCS-020-PO-1-C-S42
BCS-020-PS-1-C-1 BCS-020-PO-1-C-1,2
BCS-018-NS-1-C-S43 BCS-018-NO-1-C-S42,
BCS-018-NS-1-C-1,3 BCS-018-NO-1-C-1,
BCS-020-NS-1-C-S42 BCS-020-NO-1-C-S42
BCS-020-NS-1-C-1,2 BCS-020-NO-1-C-1,2
15.30 -25.+70°C output micro
15.30 -25.+70°C output cable
15.30 -25.+70°C power, output micro
15.30 -25.+70°C output cable
Capacitive Proximity Sensors
3-wire 1.6.16.2, 0.8.8.1, 2.4.32.4
Housing size Mounting Effective operating distance Assured operating distance
non-flush 2.20 adj. 1.6.16.2 adj.
non-flush 2.20 adj. 1.6.16.2 adj.
flush 1.10 0.8.8.1 adj.
non-flush 3.40 adj. 2.4.32.4 adj.
(pending)
STATIC RESISTANT Normally-open Normally-closed Complementary Normally-open Normally-closed Complementary BCS-030-PS-1-C-S43 BCS-030-PO-1-C-S43 BCS-030-GA-1-C-S44,3 BCS-030-NS-1-C-S43 BCS-030-NO-1-C-S42,3 BCS-030-GA-1-C-S44,3 15.30 100µA -25.+70°C power,output micro BCS-030-PS-1-C-1,3 BCS-030-PO-1-C-1,3 BCS-030-PS-1AS-C-S43 BCS-030-PO-1AS-C-S42,3 BCS-034-PS-1-C-3 BCS-034-PO-1-C-
BCS-030-NS-1-C-1,3 BCS-030-NO-1-C-1,
BCS-030-NS-1AS-C-S43 BCS-030-NO-1AS-C-S42,
BCS-034-NS-1-C-3 BCS-034-NO-1-C-
Rated operational voltage Supply voltage Voltage drop Insulation voltage rating Rated operational current Minimum operating current No-load current draw Leakage current, output Protected against short circuit Protected against polarity reveral Load capacitance Repeat accuracy Ambient temperature range Switching frequency, Utilization categories display Degree protection 60529 Housing material Sensing face material Connection wires gauge
15.30 100µA -25.+70°C output cable
15.30 100µA -25.+70°C power,output micro
15.30 100µA -25.+70°C output cable
suffix cable material length. Example meters, PU-05 meters Consult factory availability Part number will transition from during 2001 models have thermal SCP. models have pulsing SCP. outputs Connect load supply PNP, supply pages 3.4-3.5 wiring diagrams.
Capacitive Proximity Sensors
ANALOG 3-wire 1.6.20, 4.18
flat style non-flush 2.25 adj. 1.6.20 adj.
flat style non-flush 2.25 adj. 1.6.20 adj.
Housing size Mounting Effective operating distance Assured operating distance
Analog Output non-flush 2.20 4.18
Approvals: 60947-5-2 (pending) C22.2 14-M91 (pending) NEMA 5-1996
NO/NC selection
PNP/NPN selector
NO/NC selection
PNP/NPN selector
Pot.
Pot.
ANALOG OUTPUT BCS-F50-GA-1-Y-1 BCS-F50-GA-1-Y-1 BCS-F50-GA-1-Y-S49 BCS-F50-GA-1-Y-S49 Analog BCAW-030-NB-1-C-03 10.30 10%, 4.20 -30.+50°C -0.073 mm/°K, +0.16 mm/°K range, range cable
BCS-F50-GA-1-Y-1 BCS-F50-GA-1-Y-1
BCS-F50-GA-1-Y-S49 BCS-F50-GA-1-Y-S49
10.30 -30.+60°C output cable
10.30 -30.+60°C output nano
Rated operational voltage Supply voltage Supply voltage ripple Insulation voltage rating Output signal Protected against short circuit Protected against polarity reveral Load resistance Ambient temperature range
Temperature drift -30.+25°C,+25.+50°C
display (bi-color) Degree protection 60529 Housing material Sensing face material Connection wires gauge
suffix cable material length.
Output Current (mA)
S1-5 Different Sensitivity Settings
Green
Target Distance (mm)
Capacitive Proximity Sensors
3-wire M18, 0.8.8.1, 1.6.16.2
non-flush 1.10 adj. 0.8.8.1 adj. non-flush 1.10 adj. 0.8.8.1 adj. non-flush 2.20 1.6.16.2 adj. non-flush 2.20 1.6.16.2 adj.
Housing size Mounting Effective operating distance Assured operating distance
M18x1
M30x1.5
1/2"
(pending)
1/2"
86.5
PX0222A
Px0221b
STATIC RESISTANT BCS-030-WS-5-L-1 BCS-030-WO-5-L-1
Normally-open Normally-closed Rated operational voltage Supply voltage Voltage drop Insulation voltage rating Rated operational current Minimum operating current No-load current draw Leakage current, output Inrush current Protected against short circuit Protected against polarity reveral Repeat accuracy Ambient temperature range Switching frequency, Utilization categories display Degree protection 60529 Housing material Sensing face material Connection wires gauge
BCS-018-WS-5-L-S21 BCS-018-WO-S-L-S21
BCS-018-WS-5-L1 BCS-018-WO-5-L1
BCS-030-WS-5-L-S21 BCS-030-WO-5-L-S21
45.250 45.65Hz 45.250 45.65Hz 45.250 45.65Hz 45.250 45.65Hz -25.+70°C -25.+70°C -25.+70°C -25.+70°C output output output output 1/2" two-key micro cable 1/2" two-key micro cable
suffix cable material length. Example meters, PU-05 meters Split ring mounting bracket furnished with sensor
86.5
Capacitive Proximity Sensors
non-flush 3.40 2.4.32.4 adj.
3-wire 2.4.32.4
BCS-034-WS-5-L-1,2 BCS-034-WO-5-L-1,2 45.250 45.65Hz -25.+70°C output cable Approvals: 60947-5-2 (pending) C22.2 14-M91 (pending) NEMA 5-1996
Capacitive Proximity Sensors
Fits Mounting switchwell Mounting sensor Material
Accessories Switchwells, Sight Glass Brackets Detecting liquids tanks granules hoppers, glass plastic tubing
3/4" with wrench flats inside threaded PTFE (Teflon) 1-1/4" with wrench flats inside threaded PTFE (Teflon) 1-1/2" with flats
Insert M30, held with M4x12 screws
Lexan
STATIC RESISTANT Ordering code Application Notes Sensing distance Thickness front sensor Pressure rating Mounting through metal wall
Reduced thickness switchwell Reduced thickness switchwell Reduced thickness switchwell
BCS-SWITCHWELL-TM-18-X-3/4"
BCS-SWITCHWELL-TM-30-X-1-1/4"
BCS-SWITCHWELL-M30-ASSEMBLY
lbs/in
Maintain 2xSr minimum from inside wall surface face sensor
lbs/in
Maintain 2xSr minimum from inside wall surface face sensor
2.5mm pressure rated
Maintain 2xSr minimum from inside wall surface face sensor
Fits Mounting bracket Mounting sensor Material
Split halves clamped with screws Hose clamp Plastic stainless steel
Split halves clamped with screws Hose clamp Plastic stainless steel
Split halves clamped with screws Hose clamp Plastic stainless steel
Note: Refer tubular inductive sensor accessories section selection standard clamps mounting brackets.
STATIC RESISTANT Ordering code Dimensions, Pressure rating 3.10 54.1 40.1 12.1 36.1 12.0 66.0 46.0 18.1 42.9 18.8 12.7 30.2 66.0 32.5 30.2 69.9 30.0 25.4 38.1 BCSA-SG-12 BCSA-SG-18 BCSA-SG-30
Capacitive Proximity Sensors
Set-Up Procedures Capacitive sensors have adjustable potentiometer adjust sensitivity. only does this allow sensor tuned specific application, also makes sensor capable sensing through objects foreground sense objects behind However, object foreground must metallic. following procedures outlined setting normally open capacitive sensor ideal sensing conditions: Mount sensor actual application. Remove protective screw covering sensitivity potentiometer (earlier types only). worst case condition that cause sensor false trigger. example, application liquid level detection tank, fill tank. Then lower liquid level where moisture liquid residue remains around vicinity sensor. output sensor turn sensitivity potentiometer counter clockwise (CCW) until output turns OFF. output OFF, turn potentiometer clockwise (CW) until output turns then turn potentiometer until output turns OFF. Bring target into position fill tank example, bring liquid level above sensor). output should Noting number turns, adjust potentiometer until output turns OFF. Turn potentiometer number turns noted step sensor optimum sensitivity range maximum stability. Re-install protective screw cover sensitivity potentiometer, equipped. adjustment procedure normally closed capacitive sensors same above except that references output being reversed. Installation Many Balluff Capacitive Sensors designed non-flush mounting applications with certain conditional exceptions (see note below.) guarantee standard operating characteristics, so-called free zone must kept around switch isolate from materials which could affect performance. diameter free zone must least times diameter proximity switch, depth free zone double nominal sensing distance.
Installation Set-Up Procedures
Flush Mounting Threaded "non-flush" 30mm capacitive sensors flush mounted reducing sensitivity less. Shielded "flush" type sensors mounted without need free zone. These types embedded flush with mounting surface.
3.11
Capacitive Proximity Sensors
Definitions Principles Effect Materials
capacitor
traditional form consists electrode plates dielectric, with non- poorly conducting medium between. capacitance (A/d), their effect explained using step-bystep derivation their geometric shape. stray fields edges plates ignored these purposes. middle between circular capacitor plates there distance
determined surface distance dielectric constant er). describes dielectric constant this medium. additional, good conducting, folded ,,intermediate electrode" with thickness applied voltage between generates electrical field. This impresses voltage electrode ,,intermediate electrode" thereby assumes function additional capacitor plate. This effect changing capacitor into geometrically electrically series connected capacitors.
absolut dielectric constant empty space (vacuum). dielectric number, (density dependent) material constant.
sensor electrodes
these partial capacitors unfolded, plates next each other level ,,intermediate capacitor" second level distance d/2. result ,,open" capacitor.
fields capacitor halves opposite directions.
capacitive sensors
this ,,open" capacitor used sensor element. plate however configured ring electrode (housing) concentric order make electrical field symmetrical, ,,intermediate electrode" ,,actuation element". ,,active surface" this sensor element corresponds ring electrode
actuating element
active surface
Capacitance function distance still decreases hyperbolically 1/d).
formula capacitance remains with above defined premises valid even this capacitor geometry.
Non-conducting materials
(plastics, glass well liquids) detected capacitive sensors, significantly greater than preceding based fact that lines field, path least resistance leads across actuation element.
actuation element absent, they from middle ring electrode. path least resistance thereby also partially determined repelling effect identically oriented lines field.
arcs their distances become greater from inside outside.
Conditions correction factors
electrically non-conducting actuation element (target) enters sensor field, capacitance changes proportionally immersion depth resp. distance active surface. However never becomes greater than metals.
Since rated switching distance based grounded standard target made 360, switching distances must corrected when using other materials. Correction factors typical materials listed adjacent table:
Material Metals Wood Glass Water
Correction Factor
3.12
Capacitive Proximity Sensors
Function Description
Function groups.
capacitive sensor include:
Sensor field Oscillator electrode Demodulator Trigger Output driver
Active surface
sensor field
area through which high frequency sensor field enters space.
primarily determined front surface area sensor corresponds approximately surface area outer sensor electrode.
,,active surface"
Standard target.
standard target
grounded, square plate made (ISO 630), with switching distance determined 947-5-2.
Thickness side length corresponds diameter inscribed circle active surface, value larger than given diameter.
Capacitive Proximity Sensors
3.14
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