Product category:
Proximity Sensors
News Release from: Optek Technology | Subject: OPB725 Series
Edited by the Engineeringtalk Editorial
Team on 29 January 2007
Reflective switch senses objects at up
to 24in
Noncontact infra-red switch provides object sensing at ranges up to 24in or more, depending on the object.
Providing design engineers with a device capable of operating in contaminated environments, TT Electronics Optek Technology has developed a long distance reflective switch with a sensing distance of up to 24in or more, depending on the object Designated the OPB725 Series, the reflective switch consists of an infra-red LED and Photologic sensor in an opaque housing to reduce the sensors ambient light sensitivity
This article was originally published on Engineeringtalk on 3 Oct 2005 at 8.00am (UK)
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According to Roland Chapa, Vice President of Optek Technology's assemblies business unit, the components of the switch allow it to be used in a variety of applications.
"The emitter and sensor are protected by a window that is transparent to near-infrared wavelengths, which allows it to operate in dusty environments", said Chapa.
"Additionally, the Photologic sensor has an NPN open-collector output, making the switch suitable for use in a variety of applications".
Applications for the reflective switch include noncontact reflective object sensing, assembly line and machine automation, equipment security, door and end-of-travel sensing, and machine safety.
While an object is in the reflective path of a device, light from the LED will be reflected back to the housing, irradiating the surface of the Photologic sensor.
This causes the output NPN transistor to turn "on", providing a "low" output voltage when connected to the appropriate value pull-up resistor, Chapa continued.
When the infra-red light from the LED is not reflected to the Photologic sensor, the output transistor turns "off", minimising the IC(ON) current and providing a "high" output.
The OPB725 Series long distance reflective switch features an 850nm LED, and the assembly is offered with 48in (122cm) AWG wires.
The device features a power dissipation of 250mW, a maximum collector voltage of 30V, and a collector DC current of 50mA.
Operating temperature range is 0 to +50C.
Pricing for the OPB725 Series reflective switch starts US $14.95 each in quantities of 5000.
Lead time, if stock is not available, is from 6 to 8 weeks.
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