Sensors & Transducers


High-performance fibre-optic sensor

February 2002 Sensors & Transducers

Banner Engineering is offering the D10 Expert featuring dual output channels with independently configurable setpoints that enable it to solve challenging applications, with as little as 1% contrast. The sensor's advanced 16 bit microprocessor and 'teach' mode programming deliver 12 bit A/D resolution within a 300 mm range. The device is available with a choice of dual discrete outputs, or a single discrete output paired with a single 0-10 V d.c. voltage analog output can be used to replace numerous other sensing devices.

Analog output models feature Auto-Span scalable output that distributes the analog output signal over the width of the programmed sensing window automatically to provide the most continuous, most consistent response possible. This unique feature streamlines set-up and provides maximum resolution in electrically noisy environments.

An advanced LCD display provides continuous configuration and performance data, making it easy to set up and operate. Displayed data includes running mode, channel selected, signal strength (excess gain) sensing contrast stability, timing function, settings locked/unlocked, and light/dark operate. Immediately after programming, the display provides accurate indication of sensing contrast at a glance. Separate LEDs for each channel light yellow when that output is conducting and can be seen from all sides. A gate input inhibits the sensor's outputs during inactive portions of an inspection cycle, eliminating false signals and eliminating the need for an additional sensor.

The sensor is available with a choice of visible red or green sensing beams to optimise the D10's sensitivity to target colours. It accommodates large (0,75, 1 and 1,5 mm core) and small (0,25 and 0,5 mm core) polyethylene-jacketed plastic fibres to 'pipe' light into otherwise inaccessible locations. Banner's unique locking mechanism holds the fibres securely in place.

User-friendly teach mode programming allows users to set optimal device sensitivity for even low-contrast applications with the push of a button. The sensor's advanced microprocessor 'learns' the required light and dark conditions, then computes and self-programs the most accurate setting to recognise the light signal threshold. In Dynamic Teach, the sensor 'learns' a series of conditions on-the-fly, then computes and self-programs the signal threshold, continuously updating the settings during operation to compensate for changing light conditions. In Static Teach, users point-and-click to 'teach' the sensor two individual light conditions. Manual fine-tuning, achieved with the sensor's '+' and '-' buttons, offers increased sensing flexibility and precision. The D10 Expert can also be connected to an external switch, PLC or controller for convenient and secure remote programming.

Integral circuitry protects the device from reverse polarity, transient voltages, false pulse on power-up and output short circuits. The sensor is available in NPN (sinking) and PNP (sourcing) models, and operates from 12 to 24 V d.c. (15 to 24 V d.c. for 0-10 V analog models).

The D10 Expert, housed in durable black ABS polycarbonate alloy, has an acrylic cover to keep out dust and other contaminants. The sensor has an operating temperature range of -10 to +55°C. The unit includes an ABS mounting bracket, plus stainless steel hardware for direct mounting to a standard 35 mm DIN rail. Models are available with an integral 2 or 9 m pre-wired cable or a pico-style quick-disconnect connection for plug-and-play convenience.



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