Posted to News on 13th Oct 2007, 11:24
User-friendly photoelectric sensors have greater range
Carlo Gavazzi is launching a new range of photoelectric sensors that are claimed to represent the state of the art in terms of range, power consumption and user features. Known as the PD30 range, the sensors are said to cover most sensing tasks in a compact package, offering detection ranges previously only achievable with much larger devices. In addition, they embody a variety of new user features, such as a dust alarm output, remote teach input, and full- and half-mute functions, all of which are aimed at simplifying setup and reducing down-time.
Models are available for diffuse, retro-reflective and polarised retro-reflective operation. Through-beam, transparent polarised retro-reflective, and background-suppression versions are planned for introduction over the next six months. Sensing range is at least double that of previous sensors: 1m for diffuse sensing and up to 6m for retro-reflective versions.
The PD30 comes in an industry-standard 10.8 x 20 x 30mm housing with 25.4mm spacing using two M3 holes. Connection is via cable or a built-in M8 connector.
Setup is simplified by either using the sensor's teach button or a remote teach wire. Teach mode can be invoked on-the-fly, while unauthorised tampering is eliminated by connecting the remote teach wire to the power supply, thereby disabling the teach pushbutton.
A half-mute function assists in alignment and range-setting. Activating the mute function (>3s) sets the emitter at half power. Sensors are aligned using this setting, then switched to full power to provide sufficient margin for correct sensor function, even when the beam is attenuated by dust or water droplets.
Two options are offered to provide diagnostic warnings: dust alarm output or mute input. Both ensure proper sensing verification. With the dust output active, the sensor will set an alarm output if it receives an unsafe signal level for more than 10ms. This reduces downtime by ensuring that dirty sensors are cleaned when required. Full-mute checks for a blocked or malfunctioning sensor by periodically turning the emitter on and off via the mute function (0-3s), again ensuring that faults are detected as early as possible.
PD30 sensors operate from a 10-30V DC supply and are available with either PNP or NPN outputs. They are sealed to IP67 and carry CE markings, with UL approvals pending.
