Keyence develops sensors for washdown applications
A
Keyence (UK) product story
Edited by the Engineeringtalk editorial team
Nov 11, 2008
The Keyence PX Series of photoelectric sensors offer sensor heads with an IP-69K rating, allowing them to be subjected to high pressure (1400psi) washdown applications at high temperatures of 176F.
A stainless steel casing prevents damage due to vibration and shock from tools or colliding with other objects.
The sensor heads are backfilled with epoxy under vacuum conditions, filling every void in the sensor head cavity to prevent all-liquid substances and material from damaging the internal electronics.
The PX-10 IP-67 rated amplifier can get splashed or rinsed without damaging the unit.
The dual output feature allows the user to see when the sensor activates and when the low-light alarm turns on.
The Dynamic Stability Control (DSC) function continuously and automatically adjusts the set point according to the environmental conditions, thus allowing the line to be run longer between cleaning.
The PX's high-power Mega mode can blast through dust and other types of dirty environments for extended periods of time even with significant build up on the lens.
The result is stable detection that eliminates downtime and the need to frequently purchase replacement units.
The low-light alarm tells the user when the light level becomes too low for stable detection.
Customised save settings allow the user to revert back to their own settings in case something is accidentally changed while troubleshooting.
The power-saving function automatically turns off the digital display that can reduce current consumption during operation.
Seven water and oil resistant types of sensor heads are available to meet the needs of high-pressure washdown applications.
Ultra-high-intensity LEDs provide power by combining infrared or four element red LEDs with optical-quality glass lenses.
The PX-H71 through beam (20m) and PX-H61 reflective (2m) produce a visible red light for alignment.
The PX-H72 produces an infrared beam that can handle four times the detecting distances (40m) of conventional sensors and is unaffected by oil or dirt.
The PX Series also offers the hex-shaped PX-H71TZ (20m) that has a 90deg bend in the cable to help prevent entanglements.
If light intensity fluctuates due to dust or misalignment, the user can periodically adjust the set point with a touch of a button or a pulse from an external input.
The zero-shift function allows the user to adjust the displayed value to better suit their needs.
When using a reflective type, one can easily set the received background to 0.
This is useful when there is little difference in light intensity between the background and a target.
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