FM-324, Miniature Ferro-magnetic Metal Detection Sensor
Features
Actuates with Any Ferrous Metal. 10W Contact Rating. Normally Open contact. Sputtered Ruthenium Contact. Easy Screw Mounting.
Description
This screw mountable sensor can be mounted with M3 screws and can switch moderate loads of 10W. Any Ferro-magnetic material is all this is required to operate the sensor from the actuating side as shown in the sketch, and a permanent magnet is not required. The actuating distance may vary depending on the thickness and size of the ferro-magnetic material. All sensors are tested 100% for actuating distance.
| Operate Distance | mm | 3.0 – 8.0 |
| Release Distance | mm | 4.0 – 10.0 |
Electrical
| Contact Form | A | |
| Contact Rating (max) | W/VA | 10.0 |
| Switching Current (max) | A | 0.5 |
| Carry Current (max) | A | 0.75 |
| DC Switching Voltage (max) | VDC | 100 |
| Breakdown Voltage (min) | VDC | 150 |
| Contact Resistance (max) | mΩ | 150 |
| Insulation Resistance (min) | Ω | 109 |
| Capacitance (typ) | pF | 0.2 |
Miscellaneous
| Operate Time (max) | ms | 0.35 |
| Bounce Time (max) | ms | 0.30 |
| Release Time (max) | ms | 0.15 |
| Resonance Frequency (typ) | Hz | >2000 |
| Operating Frequency (max) | Hz | 500 |
| Operating Temperature Range | °C | -40 to +70 |
| Shock Resistance (½Sin wave for 11ms) | G | 30 |
| Vibration Resistance (10-2000 Hz) | G | 20 |
Ordering Code
FM-324-(Cable Length)-(Cable Termination Code)
| Cable Termination Code | Termination Type |
| S | Stripped to 5.0 mm |
| T | Stripped and Tinned |
FM-324-250-T Denotes FM-324 Sensor having 250 mm cable length with Tinned lead ends.
Other Special Configurations: Dynamic Contact Resistance Limit, Special Release AT Limits.
Usage Notes
Here are some of the recommended usage notes to ensure maximum durability of this product. The complete usage notes are available here.
Product Handling
 | Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading |
Ferro-magnetic parts
 | Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading |
Cable Handling
 | Cables with higher strands should be used so that there is minimal work hardening...Continue reading |
Reed Contact Protection Circuits
 | When a reed switch is to be connected to an inductive load or a...Continue reading |
Applications
Although we can never restrict the use of a reed sensor to a particular field, the following is a list of some of the applications that the FM-328 Ferrous Metal Detection Sensor is known to perform well.
Magnet Sensors for Door and window Security
 | Magnets can be mounted on doors and windows, and reed sensors, on the fixed...Continue reading |