Capacitive Sensors

Capacitive Sensors

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Capacitive Sensors

Capacitive sensors can be used to detect metal objects as well as nearly all other materials. These sensors are often used in applications including level, flow control for the detection of liquids, grains, and powders.

Standard Capacitive Sensor Product features:

  • 12, 18 and 30 mm cylindrical styles of stainless steel or plastic housings
  • 5mm thin rectangular and long-range 80 mm x 80 mm x 40 mm styles
  • Sensor outputs of 3-wire DC and NAMUR output types
  • Models with hazardous area approvals

What is a Capacitive Sensor?

Capacitive proximity sensors are non-contact devices that can detect the presence or absence of virtually any object regardless of material.  They utilize the electrical property of capacitance and the change of capacitance based on a change in the electrical field around the active face of the sensor.

Applications of Capacitive Sensors

  • Precision positioning
  • Disc drive industry
  • Precision thickness measurements
  • Non-conductive targets
  • Machine tool metrology
  • Assembly line testing
  • Testing the moisture content of grain
  • Soil moisture
  • Humidity
  • Detecting water content in fuels
  • Fuel composition sensors (for flex-fuel vehicles)
  • Capacitive load cells

Features

  • 4 mm flush
  • Operating distance adjustable via potentiometer
  • Suitable for foodstuff conditions
  • Resistant against aggressive media

Technical Data

Switching element function

  • PNP

Rated operating distance

  • 4 mm

Installation

  • Flush

Output polarity

  • DC

Assured operating distance

  • 0 … 2.88 mm

Installation conditions

  • A                                      0 mm
  • B                                      0 mm
  • C                                     15 mm
  • F                                     15 mm

Operating voltage

  • 10 … 36 V DC

Switching frequency

  • 0 … 50 Hz

Reverse polarity protection

  • reverse polarity protected

Short-circuit protection

  • Pulsing

Voltage drop

  • ≤ 2.5 V

Operating current

  • 0 … 100 mA

No-load supply current

  • ≤ 12 mA

Switching state indicator

  • LED, yellow

Ambient temperature

  • -25 … 70 °C (-13 … 158 °F)

About Pepperl + Fuchs

In 1945, Walter Pepperl and Ludwig Fuchs founded a small radio workshop in Mannheim, Germany, based on the principles of inventiveness, entrepreneurial foresight, and self-reliance. The experience they acquired was transformed into new ideas, and they continued to enjoy developing products for customers. The eventual result was the invention of the proximity switch. This innovation represented the starting point of the company’s success story.

Today, Pepperl+Fuchs is known by customers around the world as a pioneer and an innovator in electrical explosion protection and sensor technology.

Rosemount 5408 Level Transmitter

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Rosemount 5408 Level Transmitter

Rosemount 5408 Level Transmitter wide range of devices for liquids and solids measurement covers the whole spectrum from basic point level detection to challenging continuous level, interface and volume measurement, even in extreme conditions. Use Emerson’s Rosemount level measurement technologies to optimize your processes, plan for maintenance, and anticipate and correct issues before they become problems.

Rosemount 5408 Level Transmitter – Non-Contacting Radar

The Rosemount 5408 Non-Contacting Radar Level Transmitter uses enhanced technology and Human-Centered Design to deliver accurate, reliable measurements on both liquid and solid materials. Using two-wire FMCW technology the Rosemount 5408 deploys a continuous echo to maximize radar signal strength and produce a more robust and reliable measurement. Delivering ease-of-use at every touchpoint, the Rosemount 5408 uses an intuitive software interface to guide the operator through installation, commissioning, proof-testing and maintenance. Safety certified to IEC 61508 for SIL 2 applications, the Rosemount 5408:SIS reduces the cost of risk, increases efficiency and protects people and the environment.

Specifications

Accuracy

  • ± 0.08 in. (± 2 mm)

Measurement Range

  • 131 ft (40 m), 82 ft (25 m) for Rosemount 5408:SIS in Safety mode

Operating Pressure

  • 1450 psi (100 bar)

Operating Temperature

  • -76 to +482 °F (-60 to +250 °C)

Power Supply

  • 12-42.4V dc (12-30V dc in Intrinsically Safe installations)

Communication Protocol

  • 4-20mA HART (2-wire loop-powered)

Certifications/Approvals

  • ATEX, IECEx, FM, CSA, 3-A, CRN, see full specs for a complete list of certifications

Safety

  • IEC 61508 certified to SIL 2
    TÜV tested and WHG approved for overfill prevention

Antenna type

  • Cone antenna, Process seal antenna, Parabolic antenna

Features

  • Low 12V dc lift-off voltage
  • Immune to intermittent power loss
  • Unique PTFE seal design eliminates the need for o-rings
  • Model tailored to SIS requirements, certified to IEC 61508 SIL 2
  • Solid measurement with unique solids algorithm
  • Process seal antenna for applications with heavy condensation and aggressive media. Also available with Tri-Clamp connection
  • 3-A certified for hygienic applications

Datasheet

Pressure switch - Thermostat KP DANFOSS

Pressure switch – Thermostat KP DANFOSS

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Thermostat KP DANFOSS

The KP Thermostats are single-pole, double-throw (SPDT) temperature-operated electric switches. They can be connected directly to a single-phase AC motor of up to approx. 2 kW or installed in the control circuit of DC motors and large AC motors. The KP Thermostats are used for regulation, but can also be seen in safety monitoring systems. They are available with vapour charge or with adsorption charge. With a vapor charge, the differential is very small. The KP Thermostats with adsorption charge are widely used to give frost protection.

Features

  • Wide regulating range
  • Can be used for deep freeze, refrigeration, and air conditioning plant
  • Welded bellows elements mean increased reliability
  • Small dimensions. Easy to install in refrigerated counters or cold rooms
  • Ultra-short bounce times. This gives long operating life, reduces wear to a minimum and increases reliability
  • Standard versions with a changeover switch. Possible to obtain opposite contact function or to connect a signal
  • Electrical connection at the front of the unit. Facilitates rack mounting Saves space
  • Suitable for alternating and direct current
  • Cable entry of soft thermoplastic for cables from 6 to 14 mm diameter
  • Extensive and wide range

Technical data

Ambient temperature

  • -40 – 65 °C (80 °C for max. 2 hours)

Switch

  • Single-pole, double-throw (SPDT) changeover switch

Contact load

Alternating current

  • AC1 =16 A, 400 V
  • AC3 = 16 A, 400 V

Direct current

  • DC13: 12 W, 220 V control current

Wire dimensions

solid / stranded

  • 0.75 – 2.5 mm2

flexible, without ferrules

  • 0.7 – 2.5 mm2

flexible, with ferrules

  • 0.5 – 1.5 mm2

Tightening torque

  • max. 2 Nm

Rated impulse voltage

  • 4 kV

Pollution degree

  • 3

Short circuit protection, fuse

  • 16 A

Insulation

  • 400 V

Enclosure

  • 30/44

Pressure switch KP DANFOSS

KP pressure switches are for use in refrigeration and air conditioning systems to give protection against excessively low suction pressure or excessively high discharge pressure. KP pressure switches are also used for starting and stopping refrigeration compressors and fans on air-cooled condensers. A KP pressure switch can be connected directly to a single-phase AC motor of up to approx. 2 kW or installed in the control circuit of DC motors and large AC motors.

KP pressure switches are fitted with a single-pole double-throw (SPDT) switch. The position of the switch is determined by the pressure switch setting and the pressure at the connector. KP pressure switches are available in IP30, IP44, and IP55 enclosures.

Features

  • Ultra-short bounce time thanks to snap-action function (reduces wear to a minimum and increases reliability)
  • Manual trip function (electrical contact function can be tested without the use of tools)
  • Types KP 6, KP 7 and KP 17 with fail-safe double bellows element
  • Vibration and shock-resistant
  • Compact design
  • Fully welded bellows element
  • High reliability both electrically and mechanically

Technical data

Ambient temperature

  • -40 – 65 °C (80 °C for max. 2 hours)

Ambient temperature (PED approved units)

  • -25 – 65 °C (80 °C for max. 2 hours)

Media temperature

  • -50 – 100 °C

Max. working pressure

  • LP: PS / MWP = 17 bar
  • HP: PS / MWP = 35 bar
  • KP 6: PS / MWP = 46.5 bar

Max. test pressure

  • LP: Pe = 20 bar
  • HP: Pe = 35 bar
  • KP 6: Pe = 46.5 bar

Contact load

Alternating current

  • AC1 =16 A, 400 V
  • AC3 = 16 A, 400 V
  • AC15 = 10 A, 400 V

Direct current

  • DC13 = 12 W, 220 V control current

Wire dimensions

solid / stranded

  • 0.75 – 2.5 mm2

flexible, without ferrules

  • 0.7 – 2.5 mm2

flexible, with ferrules

  • 0.5 – 1.5 mm2

Tightening torque

  • max. 2 Nm

Rated impulse voltage

  • 4 kV

Pollution degree

  • 3

Short circuit protection, fuse

  • 16 A

Insulation

  • 400 V

Enclosure

  • IP30 / IP44 / IP55