Omron E7B Manuale utente
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)
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