Magnetic Switch System
EDI Model SM Magnetic Switch System consists of a sealed reed switch for use in above and below ground test stations. The switch is activated by holding a magnet next to it. Magnetic switches are available in Board Mount or Adjustable Mount configurations.
Board Mount switches (model SM-BRD) are mounted on a small circuit board with two 9/32 in. (7 mm) dia holes on 1 in. (25.4 mm) spacing. These switches will fit over adjacent terminals of most test stations.
Adjustable mount switches (model SM-ADJ) are centered on a length of wire terminating in 9/32 in. (7 mm) ID ring lugs. Ring lugs are spaced at 6-1/4 in. (160 mm). This design is used when the switch must span non-adjacent terminals in a test station.
Magnetically operated switches are momentary toggle switches which are activated by touching a magnet to the color band on the switch body. Green bands denote normally closed switches which are momentarily opened with the magnet. These are most often used for instant-disconnect cathodic protection coupon measurements. Red bands denote normally open switches which are momentarily closed with the magnet. These can be used to electrically isolate a reference electrode in test stations which may become submerged. For best results, the use of model SM-MAG magnets is recommended.
Electrical Specifications
Switching Current: 0.5 amps
Carry current: 1.0 amp
Switching Voltage: 175 volts
Breakdown voltage: min. 200 VDC
Contact resistance: 150 mohm
Operating temp.: -40°F – 260°F (-40°C – 130°C)
For More Information
Complete Product Information is available for downloading as pdf files. Click on the link below to download.
Magnetic Switch System (Model SM).
EDI products may be purchased from any corrosion control products distributor or directly from EDI.