5As light is polarized by a transparent film or membrane, CX-491 may notdetect an object covered or wrapped by transparent film. Such objectsinclude, for example: Can wrapped by clear film Aluminum sheet covered by plastic film Gold or silver (glossy) labels or wrapping paperIn such cases, take the following steps.1. Tilt the sensor with respect to the object to be sensed.2. Reduce the sensitivity.3. Increase the distance between the sensor and the object to be sensed. The slit mask is only available for the thru-beam type sensor.Optional slit masks help the sensor detect small objects. However, thesensing range is reduced.How to mount1. Insert the hook 1 into the bottom groove 2.2. Press the slit mask until it snaps into the grooves 3 on the top of themain unit.How to remove1. Insert a screw driver into the tab 4.2. Lift and remove carefully. For detailed information on the sensing distance and minimumsize of the sensing object, please refer to the CX-400 Series User’sManual. Interference prevention filters are only available for the thru-beamtype sensor.By mounting interference prevention filters, two sets of thru-beam typesensors can be mounted close together. However, the sensing range isreduced.The filters can be mounted using the same method as for slit masks. Fordetails, see page 5, section 9, SLIT MASKS.For interference prevention to work, the following conditions must bemet. The two sets of sensors must be fitted with different types of interferenceprevention filters. Filters must be mounted on emitters and receivers. The model no. is not shown on the interference prevention filters.Take care when mounting them on the sensors.The basic dimensions of the sensor head are 11.2 x 31.0 x 20.0mm(WxHxD). For more detailed information, please refer to the CX-400 SeriesUser’s Manual.8 RETROREFLECTIVE TYPE SENSOR WITHPOLARIZING FILTERS9 SLIT MASKSType Model no. Slit sizeRound slit maskOS-CX-05 0.5mmOS-CX-1 1mmOS-CX-2 2mmRectangular slit maskOS-CX-05 x 6 0.5 × 6mmOS-CX-1 x 6 1 × 6mmOS-CX-2 x 6 2 × 6mm1234Slit mask10 INTERFERENCE PREVENTION FILTERSModel no. Direction of thru-beam axis Color of the bracketPF-CX4-H Horizontal Light brownPF-CX4-V Vertical Silver11 DIMENSIONSPF-CX4-HPF-CX4-V11.225.42.820313Ramco Nationalwww.PanasonicSensors.com1-800-280-6933