Interrupter type opto sensors

• Do not use (interrupter) materials which are translucent to visible and infrared light.
• For proper operation in dusty and/or humid environment, select dustproof and/or waterproof sensors.
• Avoid using opto sensors in environments where high intensity of ambient light may cause erroneous operation.

Reflective type opto sensors

• Use high contrast materials for the sensed objects.
• Choose the sensed area to be as wide as practical, to ensure highest sensing resolution.
• For proper operation in dusty environment, select dustproof sensors.
• Avoid using opto sensors in environments where high intensity of ambient light may cause erroneous operation.
• Locate sensor with its active surface facing down to protect from dust contamination or use sensors with dustproof covers.
• If soft materials (e.g. paper) are being sensed, it is recommended that such material wipes (cleaning action) the active surface of the sensor.

Actuator type opto sensors

Application notes: mounting

• There are two types of actuator sensors: spring loaded and counterweight. The spring loaded actuator can be located in any position, but the counterweight one must be positioned as shown on the drawings.
• Actuator type sensors are designed to be mounted on sheet metal. If mounted on printed circuit board or plastic plate, proper attachment to such materials must be provided to avoid mechanical shift. When more adhesion is needed, glue may be used.
• Mounting hole size and shape vary between models; see recommended mounting hole dimensions for each model.
• If mounting hole has a punch burred edges, insert the sensor from the other side (see Fig. 5). Reversed insertion may cause mechanical damage to the sensor.

Application notes: mechanical

• Proper operating angle is important to achieve stable operation; see specification sheets.
• Avoid establishing operating point (OP) very close to total travel point (TTP) to guard against unstable operation (see Fig. 6).
• When used for high speed sensing, make sure that the actuator has enough time to return to free position (FP) after each actuation.
• When using spring loaded actuator type sensors, make sure that the spring pressure on the actuator will allow proper movement of the sensed object. Keep in mind that the actuator will wear through repeated mechanical contact with the sensed object.

Punch Burred Edges [Fig. 5]

[Fig. 6]

Application notes: electrical

• When using models without internal current limiting resistors in series with the input LED, adding external resistor is necessary. Calculate the resistor's value for the required supply voltage range (5 through 24v).
• Models with internal current limiting resistors have specified supply voltages; see specification sheets.
• Check maximum ratings and electrical specifications before selecting a sensor.
• Standard supply voltage is 5V; if 12V or 24V is required please contact ALEPH.
• If your application requirements cannot be met by any of our standard models, due to any of the reasons listed below, please contact ALEPH:
  • high speed, or extremely low speed
  • long life
  • wire style (color, UL grade, gauge, length, etc.)
  • connector style
  • actuator style
  • package style
  • mounting plate thickness, etc.