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.
| 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.
| 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 |
|
|
