RF (Eddy Current) Speed Sensors

RF speed sensors offer low speed response, no drag, large air gaps and sensing characteristics which enable this type of speed sensor to sense non-ferrous metals like aluminum or nonmagnetic stainless steel in addition to ferrous metal. Unlike their VR counterparts, an RF speed sensor is not a passive device and requires coupling with a signal conditioners/preamplifier. These devices produce a digital square wave output versus the analog sine wave of the VR speed sensor.

CUSTOM MODELS

In addition to our standard models, RF speed sensors are available in custom lengths, diameters, configurations, and mounting threads. Custom operating specifications (output options, etc.) are available, as well as options such as pigtail leads or NPT threading. See additional sensor customization options.

RF Sensors - Standard

Motion Sensors modulated carrier (RF) sensors require coupling with our PA1001A or PA2001series preamplifiers or other modulated carrier amplifiers.

When used with the PA1001A or PA2001 preamplifiers, they offer square wave (digital) output, low speed response, no drag, and large air gaps. They also have the ability to sense non-ferrous metals like aluminum and stainless steel, in addition to ferrous metals. RF sensors are becoming increasingly popular in applications such as turbine flow metering where it is important to sense small, free spinning devices without inducing drag on the movement of the rotor.

Product Specifications

In addition to the models specified, we can make custom RF sensors in other lengths, diameters, configurations, mounting threads (e.g., metric) as well as with different operating specifications and options like pigtail leads, NPT threads for explosion proof applications, etc. to satisfy special requirements. The products below are only a sampling of our product line; if you do not see a sensor that meets your needs, please contact us and we would be happy to manufacture a product to your specifications.

  • Modulated carrier (RF) type
  • Epoxy encapsulation
  • Open front construction (closed fronts and hermetically sealed versions are also available)
  • 300 series stainless steel enclosure
  • Two (2) pin gold plated connector (mates with: MS3106-10SL-4S) or pigtail leads
    Inductance: 1 mH +/- 10%
  • DC resistance: 10.5 ohms +/- 10%
  • Temperature range: -100°F to +400°F (-74°C to +204°C)
  • IR leakage: minimum of 50 Mohms @ 50 VDC
  • High Shock and Vibration resistance - MIL-Std-202G METHOD 214A, Test Condition H
  • Unconditional one (1) year warranty if used within specifications

 

 

 

 

11/16x24 Thread

MODEL NUMBERMOUNTING THREAD (A)THREAD LENGTH (B)OVERALL LENGTH (C)CONNECTION LEADS
RF-111/16X24.5802.242 Pin
RF-1PT11/16X24.5801.66Pigtail
RF-1EX11/16X24.6301.88NPT/Pigtail
RF-35/8x181.102.202 Pin
RF-3PT5/8x181.101.625Pigtail
RF-3EX5/8x181.102.27NPT/Pigtail

NOTES:
Dimensions in inches
Specifications +/-10%
Mounting threads UNF-2A

RF Sensors - High Temp

Motion Sensors High Temperature RF (modulated carrier) sensors are built to operate in temperature ranges beyond that of our Standard RF sensors. These sensors operate in a broad temperature range of -100°F to +750°F (-74°C to +400°C). High Temperature RF sensors come with either a standard two (2) pin connector or a three (3) foot stainless steel shielded cable to allow interconnection without the need for expensive mating connectors. The explosion proof version features NPT threading and lead-wires shielded with glass tubing potted with special high temperature cement.

Product Specifications

In addition to the models specified, Motion Sensors can make custom RF sensors in other lengths, diameters, configurations, mounting threads (e.g., metric) as well as with different operating specifications and options like pigtail leads, NPT threads for explosion proof applications, etc. to satisfy special requirements. The products below are only a sampling of our product line; if you do not see a sensor that meets your needs, please contact us and we would be happy to manufacture a product to your specifications.

  • Modulated carrier (RF) type
  • Encapsulation: high temperature cement
  • Hermetically sealed
  • 300 series stainless steel enclosure
  • Two (2) pin gold plated connector (mates with: MS3106-10SL-4S), stainless steel shielded cable or pigtail leads (explosion-proof version)
  • Operating temperature range: -100°F to +750°F (-74°C to +400°C)
  • High Shock and Vibration resistance:
  • Impact: 15 G's (11 mS, 1/2 sine) min.;
  • Vibration: 20 G's at 2,000 Hz min
  • Unconditional one (1) year warranty if used within specifications
 
MODEL NUMBERMOUNTING THREAD (A)THREAD LENGTH (B)OVERALL LENGTH (C)RESISTANCE (Ohms)INDUCTANCE (mH)CONNECTION LEADS
RF-511/16X24.5802.62282.03' Cable
RF-1011/16X24.6301.78282.0NPT/Pigtail
RF-1111/16x24.5802.22282.02 Pin

NOTES:
Dimensions in inches
Specifications +/-10%
Mounting threads UNF-2A

Active Speed Sensors - RF Models

Active, or amplified sensors with digital output offer a low-cost solution for interfacing directly to data acquisition systems. These sensors integrate a preamplifier/signal conditioner within the sensor housing and offer the advantages of excellent noise immunity and greater transmission capability.

Input power supply requirements cover the most popular ranges for both commercial and industrial use. The output frequency of these sensors has a square pulse waveform (digital) that directly relates to the number of turbine blades, gear teeth, etc. that have been sensed. These pulses, in turn, can be correlated to determine flow rate, RPM, or velocity.

INSTALLATION CONSIDERATIONS

Type
Magnetic (inductive or variable reluctance) or RF (modulated carrier)

Warranty
Unconditional one (1) year warranty if used within specifications.

Physical Features

  • Body material: 300 series stainless steel
  • Encapsulation: epoxy potting or hermetically sealed, welded construction
  • High Shock and Vibration resistance - MIL-STD-202G METHOD 214A, Test Condition H

Input Power
8 to 30 VDC, 10 mA max. @ no load
Reverse polarity protected

Pulse Output Options

  • Open collector; maximum OFF current 30 VDC, maximum ON current 400mA
  • TTL/CMOS; fan-out of 5 TTL/CMOS loads
    0-10 VDC square wave (requires 15-30 VDC input power)
    0-10 VDC square wave (requires 10-30 VDC input power)

Interconnection Options

  • Three (3) pin MIL-C-5015 type connector with gold plated pins; mates with MS3106-10SL-3S; other connector types upon request.
  • Pigtail with wires or cables.
  • NPT threaded body with wire or cable pigtail for explosion proof environments.

Temperature Range

  • Operating: -40˚C to +85˚C
  • Storage: -65˚C to +125˚C

NOTES: Units that operate up to +125˚C are also available

Pin/Pigtail Connections

  • Pin A (Red): Input Power (+)
  • Pin B (Black): Common (-)
  • Pin C (White): Pulse Output (+)

Airgap
Up to 0.140" dependent on target geometry and sensor construction.

Approvals
CE compliant to EMC Directive 2004/108/EC for use in residential, commercial, light industrial and heavy industrial environments.

MODEL NUMBERMOUNTING THREAD (A)THREAD LENGTH (B)OVERALL LENGTH (C)TIP (Lenth/Dia.) (D)OUTPUT (Pulse Range)
DR-0145/8x18.8753.5Flush FrontOpen Collector
DR-0025/8x18.8753.5Flush Front0-5 VDC
DR-0135/8x18.8753.5Flush Front0-10 VDC
DR-00711/16x24.8753.5Flush FrontOpen Collector
DR-00111/16x24.8753.5Flush Front0-5 VDC
DR-00311/16x24.8753.5Flush Front0-10 VDC

NOTES:
Dimensions in inches
Specifications +/-10%
Mounting threads UNF-2A