NVE Sensor and Isolator News
    October 2015 Electrifying  News  From  NVE
In This Issue
Two-Wire Proximity Sensor
Gear Tooth Sensor Demonstration

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Sensor Selector Guide

Isolator Selector Guide

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Document Updates
6 kV Isolator Datasheets

Isolator Catalog
(Updates include 6 kV wide-body Isolators and 12.8 kV surge immunity)

New Videos
Two-Wire Sensor Interface
Gear Tooth Sensors
Angle Sensors
    6 kV isolation and 44000-year life
1 kV Working Voltage

Fun Fact
A coffee cup* could hold approximately 700,000 of NVE’s 1.1 millimeter square ADL-Series magnetic switches.

*Although they’re quite rugged, we don’t recommend storing our parts in coffee cups.

More Fun Facts >
Application Corner
Two-Wire Magnetic Proximity Sensor
Two-wire sensors are common in industrial control to simplify wiring. But for many sensors, competing constraints make designing two-wire interface circuitry tricky.

Two wire interfaces need to operate over a wide power supply range.
With the sensor off, the circuit must draw a minimal residual current, typically in the range of one milliamp. With the sensor on, the circuit must provide enough current to drive a significant load such as a motor or solenoid. Minimum holding current is another design constraint.

NVE’s ADL-Series sensors are perfect for two-wire applications, because their low supply voltage and low quiescent current provide plenty of design margin.

Here’s a simple reference circuit:
2-Wire Sensor Reference Circuit

And here’s a demonstration:

ULLGAIn addition to their impressive electrical specifications, ADL-Series sensors feature precise magnetic operate points and an ultraminiature 1.1 millimeter package.

Standard ADL-Series magnetic operate points are 20 and 28 oersteds, with other ranges available by special order.
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New Video
Gear Tooth Sensor Demonstration
NVE Vice President for Sensors Jay Brown demonstrates the extraordinary wide air-gap range of NVE's unique GMR gear tooth sensors.

The demonstration shows the operation of ABL-Series analog gear-tooth sensors (both single and dual bridge) and AKL-Series digital gear-tooth sensors.

GT Sensor™ features include:
  • Wide airgap tolerance
  • DC (zero speed) operation
  • Precise spacing between sensor elements
  • Excellent performance over temperature and voltage
ABL-Series analog sensors provide sinusoidal outputs with one cycle per tooth. Dual bridge analog sensors have two out-of-phase outputs for determining direction. AKL-Series digital sensors include signal processing to provide a 50% duty cycle digital modulated current signal.

The demonstration shows a gear driven by a motor with a micrometer adjustment to change the air gap between the sensor and gear. This demonstrates the wide airgap range accommodated by GT sensors—a range of 5 millimeters or more.
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