Thread: Need help w/ peumatic sensor info

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I am trying to figure out if this is a pneumatic valve that is triggered when something breaks the light beam. Here is the stats:

Photoelectric proximity switch, for roller conveyors
Product type: WTR1-P421
Order number: 1013260

Product features

Sensing range min ... max: 300 ... 900 mm

Light source: LED

Type of light: Infrared light

Light spot size: approx. 40 mm at 900 mm distance

Technical data

Design: 3/2 way cylinder

Dimensions (W x H x D): 46 x 151,4 x 51,5 mm

Supply voltage min ... max: DC 19,2 ... 26,4 V

Switching output: PNP

Signal voltage HIGH: Vs - <2 V

Signal voltage LOW: 0 V

Switching mode: Dark-switching

Connection type: Cable with plug, M12, 4-pin, 1,2 m

Number of WTR: 35

Enclosure rating: IP 54

Ambient operation temperature, min ... max: -10 °C ... +55 °C

Ambient storage temperature, min ... max: -25 °C ... +75 °C

Weight: 175

Housing material: ABS

Shock load: According to IEC 68

Logical principle of operation: Individual feed

Mode of operation: closed when de-energized

Media connections: Quick plug-in connectors, 8 mm + 4 mm diameter

Coil ratings: 24 V DC, 1 W

Air flow rate: P - A, B: approx. 20 Nl/min

Ventilation capacity: A, B - R: approx. 130 Nl/min

Operating pressure range: 2-8 bar

Here is what I am looking at:

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

I emailed the seller and he simply said he couldn't help me.

Well I wrote to Sick Inc and they replied with the following info:
Hello,

My name is Eric Simmons and I am an applications engineer here at Sick Inc. I received your questions concerning the WTR1.

1)Does this basically open a valve that will release air when the optic is triggered?

Yes it will. The sensor is an "Air to Drive" device, so it will actually open the valve when the sensor does not sense anything.

2) If so how much PSI will it take and how long is the valve open for.

The psi rating is from 0 to 65 psi. The valve will stay open for as long as the photo-eye is activated, or in this sensors case when product is not present.

3) What are the power requirements?

It is a DC 24 V sensor.


If you have any further questions please contact me.


Thanks,

Eric Simmons
Application Engineer


Based on this info I decided to buy them. I'll let you know how it works out.

sounds good, they look very interesting. Let us know..

Just an observation for air cylinder operations, the vales are listed as 3/2 way and they work in a Push mode. To get Push / Pull operation you need a 4-way valve. 2-way valves work well when gravity or springs will be used to return the cylinder to it’s at rest position. The Vile things simple popup would work well with a 2-way valve. I use a leg air blaster at the entrance of my grave yard and the unit would be ok for that.

Photo eye 300 mm to 900 mm (12” to 36”) is respectable. This appears to be a diffuse unit that senses objects that pass in front of the sensor by reflecting IR light off of the object back to the sensor. In my experience these diffuse units only fire 70% of the time. Reflective units that employ a reflector to return the light beam and trigger when the beam is broken fire 99.5% of the time with a more pin point control. The dark selectable sensing option is a must for our usage.

Hope that helps.