Inductive Proximity Switch

[Darkness]

My current proximity switch got damaged and I need a replacement and I am finding it difficult to find one online.

I did find one but it was a 2-wire switch and the one I have is a 3-wire switch. At the minute I can bypass the switch by looping the live to the return wire. The 3rd wire is like an earth but I would like to know if a 3-wire proximity switch is actually needed and a 2-wire will actually do the job perfectly?

It a 5-60 Vdc, 400mA PNP barrel sensor switch.

Cheers for any help.

 

[megawatt]

A two wire will generally be fine, just make sure you get the correct type (normally open or normally closed) ... 3 wire provide both (like one way and two way light switches).
Try DigiKey (0800) 5870991 or (0800) 9047786

Edited cos I missed a bit ... Too early, not enough caffeine

 

[Spark123]

Some of the ones we use are 3 wire as they require a positive and negative supply. They also have a little LED on them to indicate wether or not they closed. Agreed you need to select the correct type, what make is the one you have?

 

[Darkness]

From all I can get of the sticker is 'sala-burgess'. There could be a letter missing from the start. There is an led on the one I have.

 

[Spark123]

What does it feed into, is it relay logic or is it a PLC? What sensing distance? We generally use Turck switches, which type depends on its environment.

 

[Darkness]

It would be a relay logic. Sensing distance would be between 5-10mm. I could travel up the country, 80-90mile to get it but you would have to pay an arm and a leg.

I might end up going that route.

 

[GaryMo]

RS Components have a great selection of proximity switches though I'm not sure if they sell to the general public. You may need an account or know somebody who has an account to order.

 

[Darkness]

RS is the place that I can find one which seems to match what I am looking for but it is only 2-wire.

Like mentioned in a post above, 2-wire could be fine.

I might have to take a chance with this one and hope for the best.

RS Stock no. 285-712 for those interested.

Just to mention, the sensor I have is 400mA so must I find one that is also 400mA?

 

[twibs]

what size are you after? m8 m12 m18 ? prewired or with plug?

a 2wire dc one will replace a 3 wire dc one ,just doesnt need a -ve,

telemechanique do 2wire ac and dc supplied 10-60vdc. 60??-240v proxy's in variety of sizes ie you can connect the one proxy to either ac or dc

 

[ricicle]

There are some 2 wire ones on the market that are configurable depending on how you connect them up - PNP or NPN N/O or N/C any combination

 

[Spark123]

Some of the ones we use even have a remote amplifier with 2 double throw contacts on which can be configured for a number of different funtions i.e. if the prox switch is removed the 2nd contact can be configured to open as a fail.

 

[Darkness]

Sorry for not getting back. I had to take a quick flight and only getting around to sort this out, now that I am back.

Anyhow I have come across several sites that sell them but I don't seem to spot the correct one especially the 400ma ones.

Now my understanding is the sensor requires 400ma of current (which the damaged sensor is) so does the sensor I want have to be 400ma? Could a 250ma one do the job?

The sensor I want is running of 12v.

Cheers.

 

[breezer]

what is it actualy for?

 

[Darkness]

Switching between 3 different steering ranges depending on what setting you have choosen. For a JCB.

 

[breezer]

oh.