Omron E7B User manual

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)
V ariation due to temperature
fluctuation
0.8 pF max. 1.5 pF max. (within ambient operating
temperature range)
V 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
2
(approx. 20 G’ s)
Pressure resistance of electrode 16 kg/cm
2
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)
W 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 AC
±
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
2
(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
W atery grains
W 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 V 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
21
dia.
20
26
dia.
16 dia.
25 dia.
52
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*
20
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)