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The HM series of sensors is based on Hall Effect sensor technology, which can sense a change in target motion from true zero to 20 KHz. These sensors require that the target be a magnet, such as magnets embedded in gear teeth, blade tips, or ring magnets. The advantage of this series, versus other Hall Effect types, is that they can sense longer air gap distances. These sensors integrate a preamplifier/signal conditioner within the sensor housing that provides excellent noise immunity and greater transmission capability. They also have a unique circuit design that offers complete protection in the event of connection mis-wiring. 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.

Types of HM Series Sensors

MSI Part Number Sensor Type Input Power Magnetic Characteristics (Operate/Release) Magnetic
Hysteresis
(Typical)
Logic 0 Logic 1
HM-C Chopper-Stabilized Omnipolar Switch 3.6 to 24VDC +/- 55G 18G North or South Pole No Magnetic Field
HM-D Chopper-Stabilized Unipolar Switch 3.6 to 24VDC +/- 135G 25G South Pole No Magnetic Field
HM-E Continuous-Time Bipolar Switch 3.8 to 24VDC +/- 75G 52G South Pole North Pole
HM-F Continuous-Time
Latch
3.8 to 24VDC +/- 150G 155G South Pole North Pole
HM-G Chopper-Stabilized
Bipolar Switch
3.6 to 24VDC +/- 25G 15G South Pole North Pole
HM-H Micropower
Omnipolar Switch
2.4 to 5.5VDC +/- 70G 10G North or South Pole No Magnetic Field
HM-I Chopper-Stabilized
Two-Wire Latch
3.5 to 24VDC +/- 80G 64G North Pole South Pole
HM-J Chopper-Stabilized
Precision Latch
4.2 to 24VDC +/- 40G 45G South Pole North Pole
  • Bipolar Switch requires a target with alternating north and south poles. The output will go to logic 0 in the presence of a south pole and switches to logic 1 in the presence of a north pole. In the absence of a magnetic field the output can be either logic 0 or logic 1.
  • Latch requires a target with alternating north and south poles. The output will go to logic 0 in the presence of a south pole and stays on logic 0 until the presence of a north pole then switches to logic 1.
  • Omnipolar Switch requires a target with a north or a south pole. The output will go to logic 0 in the presence of either a north or a south pole and switches to logic 1 in the absence of a magnetic field.
  • Unipolar Switch requires a target with a south pole. The output will go to logic 0 in the presence of a south pole and switches to logic 1 in the absence of a magnetic field.

Standard Features and Specifications

Pulse Output Options:

TTL/CMOS (Standard);

10V Square Wave

Open collector; maximum OFF voltage 24Vdc, maximum ON current 25 mA

Supply tracking:
logic 0: 0.4VDC
logic 1: (VS-0.2)xRL/(RL+2200)

Airgap:
Up to 0.250" dependent on target geometry, sensor construction, and magnet field strength.
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 cable

NPT threaded body with wire or cable pigtail for explosion proof environments

Pin/Pigtail Connections:

Pin A (Red): Input Power (+)

Pin B (White): Pulse 1 Output (+)p

Pin C (Black): Common (-)

Physical Features:

Operating temperature: -40°C to +150°C

Storage temperature: -65°C to +170°C

Body material: 300 series stainless steel

Encapsulation: epoxy potting or hermetically sealed, welded construction

Approvals:

CE compliant to EMC Directive 89/336/EEC for use in residential, commercial, light industrial and heavy industrial environments

Warranty:

Unconditional one (1) year warranty if used within specifications

Standard Models

dimension key

Configuration
Options
Mounting Thread (A) Thread Length (B) Overall Length (C) Connection Type Output
(Pulse Range)
-01 5/8x18 1.43 2.86 connector Open Collector
-02 5/8x18 1.43 2.86 connector 0-5 Vdc
-03 5/8x18 1.43 2.86 connector 0-10 Vdc
-04 5/8x18 1.43 2.86 connector Supply Tracking
-09 5/8x18 1.35 1.5 pigtail Open Collector
-10 5/8x18 1.35 1.5 pigtail 0-5 Vdc
-11 5/8x18 1.35 1.5 pigtail 0-10 Vdc
-12 5/8x18 1.35 1.5 pigtail Supply Tracking

Custom Hall Effect Speed Sensors for Magnetic Targets

In addition to the standard models shown above, hall effect speed sensors for magnetic targets are available in custom lengths, diameters, configurations, and mounting threads. Custom operating specifications (resistance, inductance, etc). are available, as well as options such as pigtail leads or NPT threading. Additional sensor customization options

We provide custom sensors on a regular basis and are happy to help develop a solution for your application, or a replacement sensor for an existing application. Please contact our engineering department at eng@motionsensors.com or 252-331-2080 to discuss your application requirements.

 
   

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