Pre-Amplifiers

Motion Sensors has developed a standard line of preamplifiers and signal conditioners for installation with our speed sensors. Our offerings include preamplifiers in several different sizes and configurations, as well as Intrinsically Safe options certified to ATEX, IECEx, and CSA. We also offer a digital to analog converter. Our engineering department has the ability to modify standard configurations to meet specific customer needs or to develop a solution to meet your specific parameters. Feel free to contact us at eng@motionsensors.com or 252-331-2080.

PA2001 Pre-Amplifier (1.1”)

The Motion Sensors PA2001 series preamplifiers allow convenient interfacing with process measuring devices and digital electronics.

This series of preamplifiers/signal conditioners is available in a combination version that provides user selection of either VR or RF sensor input.

When used with VR sensors they will accept low-level signals and provide hysteresis to eliminate unwanted noise and interference. Operating range is 4 to 10,000 Hz. When used with RF sensors, they provide false pulsing safeguards, air gaps up to 0.150", a frequency range of 2 to 5,000 Hz, as well as a precisely tuned carrier signal to allow for maximum signal reliability.

INSTALLATION DRAWING

Input Power

  • Voltage: 8 to 30 VDC
  • Current draw: 25 mA @ 24 VDC
  • Reverse polarity protected

RF Sensor Input

  • Modulation carrier frequency: 25 KHz
  • Input frequency: 2 Hz to 5 KHz
  • Maximum air gap: 0.150"
  • Preferred coil inductance: 1.0 mH +/- 10%
  • Max. distance from sensor to preamp: 100'

VR Sensor Input

  • Input protected, RF and band pass filtered
  • Input frequency: 0 to 10 KHz
  • Trigger sensitivity: 4 mV RMS min (note: at 4 mV frequency range 10 Hz to 3 KHz)
  • Input impedance: 40K ohms (nominal)
  • Max. input signal: 600 V RMS
  • Max. distance from sensor to preamp: 100'

Pulse Output Options

  • All output options are user selectable
  • Open Collector; Vmos transistor maximum OFF state voltage
  • 30 VDC; maximum ON current 400 mA
  • TTL/CMOS: fan-out of 5 TTL/CMOS loads
  • 0 to 10 VDC square wave
  • Square wave tied to input voltage

Temperature Range

Operating: -40°F to +185°F (-40°C to +85°C)

Units to +125°C also available.

Storage: -40°F to +302°F (-40°C to +150°C)

Enclosures

  • Unit is intended for mounting in an elbow conduit box such as Crouse-Hinds Model LBY15.
  • Enclosure requirements: GUAx16,26,36 or equivalent

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

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

Physical Dimensions

  • Board diameter: 1.1" +/- 0.1"
  • Height: 0.96" +/- 0.02"

Standard Models

MODEL NUMBERDESCRIPTION
PA1001A-1Suitable for VR or RF Input

NOTE: Please inform factory if you would like a specific shipped confirmation – i.e. VR or RF and desired output type.

PA1001A Pre-Amplifier (2.75”)

The Motion Sensors PA1001A series preamplifiers allow convenient interfacing with process measuring devices and digital electronics.

This series of preamplifiers/signal conditioners is available in variable reluctance (VR) and RF sensor configurations as well as a combination unit that provides user selection of either VR or RF sensor input.

Optional features include factory installed pulse scaling and field or factory installed analog output modules. The analog output module provides both current and voltage outputs proportional to RPM, flow-rate, etc.

INSTALLATION DRAWING

Input Power

  • Voltage: 8 to 30 VDC
  • Current draw: 125 mA @ 24 VDC (all options equipped)
  • Reverse polarity protected

RF Sensor Input

  • Modulation carrier frequency: 25 KHz
  • Input frequency: 5 Hz to 5 KHz, user-adjustable trigger level to eliminate false pulsing
  • Carrier adjustment to allow precise tuning of carrier signal to physical environment (e.g., air gap, wall thickness)
  • Maximum air gap: 0.160" (dependent on target geometry and construction)
  • Preferred coil inductance: 1.0 mH +/- 10%
    Max. distance from sensor to preamp: 100'

VR Sensor Input

  • Input protected, RF and band pass filtered
  • Input frequency: 10 Hz to 10 KHz, user-adjustable trigger level to eliminate false pulsing (higher frequencies also available)
  • Trigger sensitivity: 4 mV RMS min (note: at 4 mV frequency range 10 Hz to 3 KHz)
  • Input impedance: 40K ohms (nominal)
  • Max. input signal: 60.0 V RMS
  • Max. distance from sensor to preamp: 100'

Pulse Output Options

  • All output options are user selectable
    - TTL/CMOS: fan-out of 5 TTL/CMOS loads
    - 0 to 10 VDC square wave
    -Square wave tied to input voltage

Temperature Range
Operating: -40°F to +185°F (-40°C to +85°C)
Storage: -40°F to +302°F (-40°C to +150°C)

Optional Features

  • Pulse Scaling
  • Divisions of 2, 4, 8, 16, 32, 64 or 128 (user selectable)

Analog Output Module

  • Current Output
    - Accuracy +/- 0.05% of full-scale & +/-200 PPM/°C
    - Available range 4-20 mA
    - Output suitable for driving, floating, or grounded loads
    - Maximum loop impedance 500 ohms
    - Response time 3 seconds for 10% to 90%
  • Voltage Output
    - Accuracy +/- 0.05% of full-scale & +/-200 PPM/°C
    - Available range: 0-5 VDC or 0-10 VDC, user selectable
    - Impedance: <10 ohms
    - Response time: 3 seconds for 10% to 90%

Enclosures

  • Unit is intended for mounting in a conduit box and comes with 2" and 2.5" center mounting holes. Enclosure is not required but recommended to protect unit from moisture, dirt, etc.
  • Enclosure requirements: GUAx16,26,36 or equivalent

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

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

Physical Dimensions

  • Board diameter: 2.75"
  • Center mounting holes: 2" and 2.5"
  • Height (standard): 0.625" (NOTE: with analog output option add 1.325"; may change with different connector types)
MODEL NUMBERDESCRIPTIONENCLOSURE COVER TYPE
PA1001A-1StandardStandard Lid
PA1001A-1PSWith Pulse ScalingStandard Lid
PA1001A-1AWith Analog Module2" Dome Lid

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

Digital to Analog Converter

The Motion Sensors PCA121S Digital to Analog Converter is a convenient and low cost device that will provide current and/or voltage based analog output from pulsed signals when these are needed to drive plotters, recorders, printers, and other data acquisition equipment. Its intended use is with sensors, preamplifiers, and other devices that produce digital, pulsed output when analog output is also desired. The PCA121S can be used, for example, with our Digi-Pulse (DP), Hall Effect (HE), and magnetoresistive (MR) sensors, as well as our PA1001A and PA2001 series of preamplifiers. The PCA121S can also be used with our Intrinsically Safe products when it is mounted on the "safe" side of the barrier.

INSTALLATION DRAWING

Input Power
Voltage: 8 to 30 VDC Reverse polarity protected

Pulse Input

  • Frequency range: 0 to 12.8 KHz Pulse type: 0 to 5 TTL/CMOS (other types of pulse inputs also available; contact factory for details)
  • Max. distance from sensor to preamp: 100'

Current Output

  • Accuracy: +/- 0.05% of full-scale +/- 200 PPM
  • Available range: 4-20 mA Output suitable for driving, floating or grounding loads
  • Maximum loop impedance: 500 ohms Response time: 3 seconds for 10% to 90%

Voltage Output
Accuracy: +/- 0.05% of full-scale +/- 200 PPM Available range: 0 to 5 VDC or 0 to 10 VDC, user selectable Impedance: <10 ohms Response time: 3 seconds for 10% to 90%

Temperature Range
Operating: -40°F to +185°F (-40°C to +85°C)
Storage: -40°F to +302°F (-40°C to +150°C)

Physical Dimensions
2.58" MAX x 1.5" MAX x 0.41" MAX

Enclosures
Unit is intended for mounting in a conduit box. Custom configuration for other housings available. Enclosure is not required but is recommended to protect unit from moisture, dirt, etc.

Terminal Connections and Type

  • Input Pulse and Power: (Terminal Block 2)
  • Pulse (+): terminal 1
  • Common(-): terminal
  • 2 Power (+): terminal 3
  • Analog output: (Terminal Block 1) Voltage (+): terminal 1
  • Common (-): terminal 2
  • 4 to 20 mA (+): terminal 3
  • Type
    Screw-down (optional Phoenix type with mating connector also available)

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

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

DIN Rail Pre-Amplifier

The PA7 and PA8 Series preamplifiers provide the functionality of our standard preamplifiers in a convenient DIN Rail enclosure for easy mounting and installation. Versions are offered for both Variable Reluctance (Mag) as well as RF sensor input. Models include the most popular pulse output options.

INSTALLATION DRAWING

Input Power

  • Voltage: 8 to 30 VDC
  • Current draw: 50mA MAX.
  • Reverse polarity protected

RF Sensor Input

  • Modulation carrier frequency: 25 KHz
  • Input frequency: 2 Hz to 5 KHz
  • Preferred coil inductance: 1.0 mH +/- 10%
  • Max. distance from sensor to amplifier: 100'

VR Sensor Input

  • Input protected, RF and band pass filtered
  • Input frequency: 2 Hz to 10 KHz, user-adjustable trigger level to eliminate false pulsing
  • Input impedance: 40K ohms (nominal)
  • Max. input signal: 60.0 V RMS
  • Max. distance from sensor to amplifier: 100'

Pulse Output Options

  • Open Collector
  • TTL/CMOS: (0-5 VDC square wave)
  • 0 to 10 VDC square wave
  • Supply Tracking; Logic 0 <= 0.4 VDC; Logic 1 >= V Supply - 0.2 VDC
    For additional output options contact us.

Temperature Range
Operating: -40°F to +185°F (-40°C to +85°C)

Units that operate to 105°C are also available.

Electrical Connections
Screw terminals suitable for 24 to 12 AWG wire

Mounting
NS 35/7.5 and NS 35/15 DIN-Rail

Suitable Sensors

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

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

MODEL NUMBERDESCRIPTION
PA7-1DNRF, 5V DIN Mount
PA7-2DNRF, 10V DIN Mount
PA7-3DNRF, O.C. DIN Mount
PA7-4DNRF, Supply Tracking DIN Mount
PA8-1DNMAG, 5V DIN Mount
PA8-2DNMAG, 10V DIN Mount
PA8-3DNMAG, O.C. DIN Mount
PA8-4DNMAG, Supply Tracking DIN Mount