Omron E7B Manual de usuario

Capacitive Level Sensor E7B

Compact, High Sensitivity Level Sensor

Uses Capacitance to Detect Product

Submersible oil resistant construction for use in

aggressive environments.

Low mutual interference enables close mounting of

multiple units.

Installation with E7U controller provides dual sensor

control for dependable high–low level control.

Ordering Information

Function

type

Probe type

Detectable material

Controller unit

Sensing probe

General purpose

Polyacetal covered

stainless steel

See chart

E7U E7B-311M

High sensitivity type

Stainless steel

E7B-111

Specifications Type

Item E7B–111 E7B–311M

Supply voltage

24 VDC (ripple: 10% max.)

Operating voltage range

15% of rated voltage

Current consumption

21 mA max.

Oscillation frequency

Approx. 600 kHz

Operating sensitivity

0 to 20 pF 0 to 100 pF

Stable operating sensitivity

1.5 pF max. 5.0 pF max.

Control Output

Solid–state output: 24 VDC 100 mA max. (output resistance: 6.8 k

Ω)

ariation due to temperature

fluctuation

0.8 pF max.

1.5 pF max. (within ambient operating

temperature range)

ariation due to voltage fluctuation

0.2 pF max.

1.0 pF max. (within operating voltage range)

Min. permissible resistance by

material adhering to electrode

100 k

Ω

min.

30 k

Ω

min.

Insulation resistance

Data are excluded because case is grounded

Dielectric strength

Vibration

(mechanical durability)

10 to 25 Hz, 1.5 mm double amplitude

Shock

(mechanical durability) 200 m/s

(approx. 20 G’

Pressure resistance of electrode

16 kg/cm

max.

Ambient temperature

Operating: –10

to 70

°C

Ambient humidity

Operating: 35% to 95% RH

Degree of protection

Submersible construction (JIS C0920), IP67 (IEC 144)

eight (circuit section)

Approx. 600 g (E7B-1

11)

E7B E7B

Accessories – Order Separately

Order

number

E7U (Controller Unit)

Supply voltage

100/1

10/120/200/220/240 V

10%, 50/60 Hz

Power consumption

4 V

A max.

Output voltage and

current

24 VDC 35 mA

Control output

220 VAC, 2A, p.f.=1, 100,000

operations (under max. load)

12 VDC, 10 mA, 10,000,000

operations (under min. load)

Twin contact SPDT

Insulation resistance

5 M

Ω

min. (at 500 VDC)

Vibration

Mechanical durability:

10 to 25 Hz, 1.5 mm double

amplitude

Shock

Mechanical durability: 50 m/s

(approx. 5 G)

Ambient temperature

Operating: –10

to 40

°C

Ambient humidity

Operating: 45% to 85% RH

Engineering Data

Detectable Materials Chart

E7B-311M

Water

solutions

atery grains

atery sand

Metal powders

E7B-111

ABS

Cocoa bean cake

Melamine resin

Silicone resin (liquid)

Acetate Cof

fee bean cake

Methanol

Silver chloride

Acrylic resin

Cottonseed oil

Mica

Sodium carbonate

Alcohol Ebonite Naphthalene

Sodium dichromate

Alkyd resin Epoxy resin Nylon

Soybean oil

Aluminous porcelain

Ethyl alcohol

Paints Soybean cake

Amino alkyd resin

Feed (soybean meal, etc.)

Palm cake

Sulphur (liquid)

Asbestos Flux Phenol Sugar

Asphalt Formalin Phosphate rock Steatite

Barium nitrate

Glass-beads

Polyacetal resin

Thinner*

Barley (grain)

Glycerin Polycarbonate T

urpentine oil*

Calcium

Grape sugar

Polyester resin

Urea resin

Calcium phosphate

Graphite Polyurethene Urethane

Carbide powder

Gravel Quartz V

anadium sulfide

Carbide dioxide

Gum arabic

Quartz sand V

inyl chloride (powdered)

Carbolic acid

Gypsum

Rice flour

inyl chloride (granulous)

Celluloid

Linseed oil

Salt

Wheat (grain)

Cellulose Corn cake Sand

Wheat flour

Chloroform

Margarine (crude)

Silicone varnish

Xylene

E7B E7B

Dimensions

E7B-111

E7U

E7B-311M

PL11

Back mount socket (order separately)

Note: *PF113A–E

track mounted socket is supplied with the E7U controller unit as an

accessory (PF113A–E can be used as a front connecting socket)

5635 34 54 20 150

dia.

16 dia.

25 dia.

Cable clamp screw

(polyacetal) Cover

(polyacetal)

Metal fitting

(SUS 304

opposite side: 38 mm)

PT1 mounting

screw

(SUS 304)

Insensitive electrode

(SUS 304)

Insulator

(polyacetal)

Sensitive electrode

(SUS 304)

150

Insulator

(polyacetal) Sensitive electrode

(SUS 304)

PF113A–E track

mounted socket*

Connections

Single

unit control

2 unit control

Self-holding control

Output stage circuit diagram

Residual voltage when operated: 2 V max.

(under max. load between output and 0 V)

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