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)
