Long Distance Laser Sensors Detect Objects Regardless of Color or Size


Background Suppression Feature Allows Sensor to Recognize Minute Objects and Elevation Changes

Southington, Conn. — December 8, 2005.... Baumer Electric has introduced two long distance laser diffuse sensors with background suppression that detect extremely small and/or thin objects as well as depressions at distances of up to 1.5 meters regardless of background color or reflectivity.

The OHDM 12 and OHDM 20 sensors easily detect reflective objects (white) on non-reflective backgrounds (black) and vise versa. These sensors provide an on/off signal – the target is either detected or it is not. The sensors are ideal for long-range part placement, part detection, counting, and control monitoring in a range of industries including automotive, food/beverage, semiconductor/electronics assembly, print/graphics, packaging, and medical equipment manufacturing.

The OHDM 12 features a sensing range of 16 to 120 mm, with a beam diameter of 0.9 to 0.5 mm. Response time is less than 0.9 ms with release time less than 2.7 ms. The rectangular sensor measures 12.4 mm wide by 37 mm long by 34.5 mm deep, and features a housing of die cast zinc.

The sensing range of the OHDM 20 is 200 to 1500 mm, with a beam diameter of 2 mm. Response time is less than 0.6 ms and release time is less than 18 ms. This larger sensor measures 20.6 mm wide by 65 mm long by 50 mm deep with a die cast zinc housing.

Both sensors are IP-67 sealed and function well in operating temperature ranges from 0ºC to +50ºC.

Baumer is a global leader in the design, manufacture and marketing of high quality, precision sensors since 1952 serving a variety of markets including Automation, Graphics, Robotics/Material Handling, Medical, Machine Tool and Specialty Machines.


• type background suppression • light source pulsed red laser diode • sensing distance Tw 210 ... 1500 mm • sensing range Tb (at Tw max.) 200 ... 1500 mm • sensing range Tb (at Tw min.) 200 ... 210 mm • light indicator LED red • power on indication LED green • sensing distance adjustment Teach-in • laser class 2 • wave length 650 nm • beam diameter 2 mm • response time < 6 ms • release time < 18 ms • voltage supply range +Vs 12 ... 28 VDC • current consumption max. 100 mA • voltage drop Vd < 5 VDC • output function light / dark operate • output circuit PNP • output current < 20 mA • short circuit protection yes • reverse polarity protection yes, Vs to GND • width / diameter 20,6 mm • height / length 65 mm • depth 50 mm • type rectangular • housing material die-cast zinc • front (optics) glass • connection types connector M12 5 pin • operating temperature 0 ... +50 °C • protection class IP 67
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