NPN, PNP or Namur Configuration

Basic information on the differences between PNP, NPN and Namur (which I have never come across) are in the data sheet, but relate to current sinking or sourcing (some meters require a certain type where others have an adjustable setting to allow either).

Data sheets and manuals seem to indicate PNP output is what you want for your application.

"NAMUR is an international user association of automation technology in process industries.". It's also the name of an interface standard. It's a bit obscure - I had to look into it for a customer a while back.

"Putting it simply, when a Namur sensor "sees" a target, the resistance goes from low to high."

This kind of data sheet unfortunately is often to be found. The problem is when developers have to write a description of their own instruments because they (and only they) know what they mean. Papers like that will never totally meet the customers requirements - they should have been written by people who look on the instrument for the first time in order to clear all possible questions.

Your batcher can be configured as input for up to 30V - this seems the right for me as you get 24V pulses out of your npn configured meter output. I would try this.

Good luck - regards Uwe

Actually, it is exactly the opposite. Namur is an international standard for the chemical industry. The specifications for Namur sensors were defined through collaboration between sensor manufacturers in order to make the specs readily accessible to everyone in the industry.

Namur sensors from any manufacturer will work with intrinsically safe barriers (ISBs) from any other manufacturer. In other words, thanks to the standard one can easily use Turck sensors with Banner ISBs. In the past was sometimes possible, but very tedious. In fact, it was usually easier to replace both the sensor and the ISB when only the sensor was bad.

Usually NPN or PNP is selected based on the type of controller you are using, and the type of controller you use is based on preference. In the US, PNP inputs are the most common. To put it simply, a PNP input switches the "hot" wire of an electrical circuit. In Japan, NPN inputs, which switch the negative wire, are the most common.

Namur sensors are specially designed to work with intrinsically safe barriers (ISBs). ISBs are electronic devices that limit current to a few mA in the event of a fault such as a cut wire. This protection makes it safe to use an electrical device in a hazardous environment like a chemical processing plant where explosive vapors or dust are likely to be suspended in the atmosphere, and a small spark could lead to a disaster. Since ISBs are expensive they are not typically used non-hazardous environments.

... Think you'll find those are the batcher outputs. See the drawing I posted, taken from the manual.

Sorry - mis-read. 13/14 is batcher analog out, 1/2 and 3/4 are batcher relay out. Sensor in (to which the OP's question relates) is on 5.

Sorry it took me so long to get back I have been struggling with getting ready for finals. Thanks everybody for your help once again CR4 has refused to let me down.