Chuck_Revised
Well-known member
The door switch (on the imagesetter I tore down) utilizes a sensor with a reed switch that contains a small qty. of ruthenium.
It is a Hamlin part #59135 from 1997. According to the Hamlin website:
"The basic reed switch consists of two ferromagnetic nickel-iron wires and a glass capsule. The two wires are formed into "reeds" by flattening one end. The reed ends are carefully aligned with a small overlap and then permanently sealed inside the glass capsule. The overlap or contact area of the reeds is coated with special metals such as ruthenium. The nickel-iron leads are tin plated so that they can be soldered."
The door switch in this instance prevents the laser or power from operation if the door is open.
It is a Hamlin part #59135 from 1997. According to the Hamlin website:
"The basic reed switch consists of two ferromagnetic nickel-iron wires and a glass capsule. The two wires are formed into "reeds" by flattening one end. The reed ends are carefully aligned with a small overlap and then permanently sealed inside the glass capsule. The overlap or contact area of the reeds is coated with special metals such as ruthenium. The nickel-iron leads are tin plated so that they can be soldered."
The door switch in this instance prevents the laser or power from operation if the door is open.