User Manual
MINI-BEAM
®
Sensors
SM2A312F
page 2
O-ring
Retaining Clip
MINI-BEAM Features
MINI-BEAM Fiber Information
15 Turn
Gain
Adjustment
and Light/Dark
Operate Switch*
Gasketed
Acrylic Cover
Red LED Lights when the
sensor's output is conducting
* Note regarding Light/Dark operate switch:
• Turn switch
fully
clockwise for light operate (sensor outputs conduct when
sensing light is received)
• Turn switch
fully
counterclockwise for dark operate (sensor outputs conduct when
sensing light is not received)
1) Install the O-ring (supplied with the fiber) on each fiber end, as shown in the
drawing.
2) While pressing the fiber ends firmly into the ports on the front of the sensor,
slide the U-shaped retaining clip (supplied with the sensor) into the slot in the
sensor’s barrel, until it snaps into place.
Focal Length of Lens
Focus
5/16" Threaded
Sensing Tip
Illuminate Opposite End
Lens Housing
End of Fiber Optic Bundle
Lens
Lens Attachment
Lenses are sometimes added to fiber optic assemblies for extending opposed mode sensing range. Banner ofers the following lens
assemblies for use with fiber optic assemblies which have 5/16” -24 threaded sensing tips (e.g. fiber model IT23S):
Model Lens Size Focal Length Housing Notes
L9 12.5 mm (1/2”) 12.5 mm (1/2”) Aluminum
Suitable for all but
highly corrosive
environments
L16F 25 mm (1”) 44 mm (1.7”) Delrin
L16FAL 25 mm (1”) 44 mm (1.7”) Aluminum
L16FSS 25 mm (1”) 44 mm (1.7”)
Stainless
Steel
Suitable for all
environments
Suitable for all but
highly corrosive
environments
Maximum operating
temperature is
100º C (212º F)
Lenses are most efficient when they are located slightly beyond their focal length distance from the sensing end of the fiber optic
bundle. The easiest way to focus a lens is to treat it like a magnifying glass.
Illuminate the fiber optic bundle at the threaded end of the fiber optic assembly by directing the opposite end toward a visible light
source (e.g. - an incandenscent bulb, visible LED, sunlight, etc.). Thread the lens onto the fiber optic assembly until the end of the
fiber optic bundle comes into sharp focus under the lens. Then, back off (unthread) the lens assembly from the point of sharpest
focus by one to three full turns. The illuminated bundle should now appear slightly blurred. This is the optimum setting, and the
lens may be secured in position using one of the jam nuts provided. Refer to the drawing above.