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Home Resources Hall Effect Academy Selecting the Appropriate Hall Effect Sensor and Target Magnet

Selecting the Appropriate Hall Effect Sensor and Target Magnet

Overview of Selecting the Appropriate Hall Effect Sensor and Target Magnet:

Charts in this application note indicate the typical gap ranges that our Hall Effect Switches will detect target magnets available on our website. All curves and switch points are based on the sensing element location in a typical housing and the calculated magnetic field strengths.

Using the Charts:

Each chart shows the typical output curve of the field produced by the South Pole of multiple magnets at room temperature. The upper horizontal line indicates the worst case for the sensor type to switch (max switch point or highest possible field required). The middle line indicates the typical switch point for the sensor. The lowest line indicates the smallest possible field that could potentially trigger the sensor (min switch point).

Sensors are 100% tested to switch at the max switch point, but most will operate closer to the typical switch point. The guaranteed range* that a given sensor will detect a specific magnet will be from a gap of 0.000” to the point where the curve reaches the max switch point. The minimum gap required to ensure that the sensor will not trigger the magnet is the below where the curve crosses the min switch point.

Below each chart is a table indicating the max, typical, and min switch point for the sensor and each magnet type listed.

Chart titled Gap Ranges for Target Magnets shows field strength (gauss) vs. air gap (inches), with curves and horizontal lines marking Hall Effect Sensor switch points, trigger point, and ranges for a target magnet. by Standex Detect

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Measuring Air Gap

This figure shows how the air gap is measured between a sensor and target magnet for the charts and data in this Application note.

Diagram showing a Hall Effect Sensor facing a Target Magnet labeled N and S, with an air gap between them. An arrow points to the sensor face, and another arrow indicates the air gap. by Standex Detect

Charts

Each chart lists common Neodymium Cylinder Magnets available from Standex Detect. Data for other magnets is available upon request.

Click the tab below to see the sensitivity of the sensor and max gap data for each characteristic.

HS / HSQ / HSCD / DHS / DHSS

The HS element used in the above sensors switches between 85-157 Gauss, with a typical switch point of 120 Gauss.

Line graph titled HS - Gap Ranges for Target Magnets, displaying field strength (Gauss) versus air gap (inches) for various RM-01-xxx target magnets, with Hall Effect Sensor max, min, and typical switch points shown. by Standex Detect
A table titled HS - Target Detection Gaps lists Target Magnet models, their diameters and heights, and the operate gap range (min, typical, max) in inches, with detailed footnotes about Hall Effect Sensor and magnet field factors. by Standex Detect

HS1 / HS1Q / HS1CD / DHS1 / DHSS1

The HS1 element used in the above sensors switches between 15-45 Gauss, with a typical switch point of 30 Gauss.

Line graph showing field strength vs air gap for various magnets (RM-01-xxx). Three switch points (max, typical, min) are shown. Field strength decreases as the air gap increases for each magnet, highlighting the importance of Selecting the Appropriate Hall Effect Sensor and Target Magnet for optimal performance in different applications. by Standex Detect
Table listing HS1 Target Detection Gaps for various magnets, showing diameter, height, minimum and maximum detection gaps under different conditions—with guidance on Selecting the Appropriate Hall Effect Sensor and Target Magnet—along with notes on materials and sensor sensitivity at the bottom. by Standex Detect

IHS2 / IHS2Q / IHS2CD / DIHS2 / DIHSS2

The IHS2 element used in the above sensors switches between 105-222 Gauss, with a typical switch point of 180 Gauss.

Line graph showing field strength in Gauss vs air gap in inches for multiple curves labeled RM-01.xxx. The legend shows MAX, TYP, and MIN switch points for IHS2 target magnets—crucial data when Selecting the Appropriate Hall Effect Sensor and Target Magnet for your application. by Standex Detect
Table displaying IHS2 target detection gaps for various magnets, listing diameter, height, and operating gap range in inches, with notes on materials and sensor limitations to assist in selecting the appropriate Hall Effect sensor and target magnet. by Standex Detect

HS3 / HS3Q / HS3CD / DHS3 / DHSS3

The HS3 element used in the above sensors switches between 213-311 Gauss, with a typical switch point of 268 Gauss.

Line graph showing field strength (Gauss) versus air gap (inches) for various RM-01 target magnets, with labeled switch points for HS3 max, typical, and min. Different colored lines represent each magnet range, providing valuable data for selecting the appropriate Hall Effect sensor and target magnet combination. by Standex Detect
Table displaying detection gaps for various HS3 sensors with dimensions, operating gap ranges, and notes about sensor accuracy based on different materials and testing conditions—helpful for selecting the appropriate Hall effect sensor and target magnet. by Standex Detect

EHS1 / EHS1Q / EHS1CD

The EHS1 element used in the above sensors switches between 15-55 Gauss, with a typical switch point of 38 Gauss.

Line graph showing field strength (Gauss) versus air gap (inches) for various magnets, providing valuable insight for Selecting the Appropriate Hall Effect Sensor and Target Magnet. Multiple colored curves represent different magnets and switch points. by Standex Detect
Table showing EHS1 target detection gaps for various magnets, listing diameter, height, operating gap range (min 55G to max 155G), and a note on test conditions and sensor reliability at different gaps—essential considerations when Selecting the Appropriate Hall Effect Sensor and Target Magnet. by Standex Detect

MRS /MRQ / MRCD

The MRS element used in the above sensors switches between 10-25 Gauss, with a typical switch point of 15 Gauss.

Line graph showing field strength (Gauss) vs. air gap (inches) for different magnet models, with curves for max, typical, and min switch points. Field strength decreases as air gap increases—a key consideration when selecting the appropriate Hall Effect sensor and target magnet. Legend and labels included. by Standex Detect
Table displaying target detection gaps for various magnets (RM-01-051 to RM-01-038), listing their dimensions, and maximum operate gap ranges for sensors at MG levels of 25 and 10, with values in inches—designed to assist in Selecting the Appropriate Hall Effect Sensor and Target Magnet for your application. by Standex Detect

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