Pepperl+Fuchs Blog

Ask an Expert Industrial Sensors: Episode 13

Posted by John Appleson on Thu, Oct 29, 2015

This episode of Ask an Expert for industrial sensors examines and provides answers to interesting sensing questions we've received from customers just like you. We explore and answer these questions:

1. Is the NJ15+U4+W inductive proximity sensor waterproof?
2. How do you power the LED on the sensor NBB4-12GM50-A2-V1?
3. Is the NJ4-12GK-SN the right sensor for use with valve actuators?
4. Does the NMB1.5-8GM50-E2-C-FE-V1 inductive sensor have a pigtail cable version?

Ask an Expert Industrial Sensors

Feel free to ask us your sensing questions, and we'll do our best to reply with the whys and hows of a particular solution.




John: Welcome to Ask an Expert! Hi, this is John Appleson, Marketing Manager with Pepperl+Fuchs. Today, I'm joined by Tracy Molnar. Tracy works as an Application Engineer here at Pepperl+Fuchs. So welcome, Tracy and thanks for being here!

Tracy: Hi John, thanks for asking me.

John: OK, the first question asks about the NJ15+U4+W inductive proximity sensor. The customer would like to know if this sensor is submersible. Tracy, is this sensor waterproof?

Tracy: Yes, it is. The sensor in this question has a limit switch style housing with a protection rating of IP68, which means it can go under water without damage to the internal electronics. These are encapsulated against the ingress of dust or liquid under certain conditions. The customer should keep in mind that when he wires the sensor using the terminal compartment base, if that part of the sensor is to be submerged, he'll have to provide waterproof cable fittings to protect against water entering the terminal compartment through the cable entrance.

John: Tracy, this customer would like to know what the Pin 3 is on a standard inductive proximity sensor NBB4-12GM50-A2-V1 with connector. He is also interested in knowing how the LED gets its power. Can you please explain?

Tracy: Sure! To answer the first question about the pinout of this sensor, the customer should consult the connection diagram on the data sheet. Pins 1 and 3 are used to connect the 10 to 30 volt DC operating voltage that powers the sensor and its output circuits. Pin 1, labeled L+, is the power supply positive connection, and pin 3, labeled L-, is the negative power supply connection. Pins 2 and 4 are the complementary PNP outputs - one or both of which can be connected to a load, which is represented in the diagram by the small rectangles between the sensor and the DC negative.

The customer's second question asks how the sensor's LED indicator is powered. The sensing mechanism and any LEDs or output circuits all get their power from the 10 to 30 volt DC operating voltage supplied across pins 1 and 3.

John: Tracy, this next customer is wondering if the NJ4-12GK-SN is the right inductive proximity sensor for his application. He states that he requires a sensor for transmitting the open and closed position on a valve actuator. He would like a mounting kit to position the sensor on the actuator. Could you share your thoughts on this?

Tracy: Yes, that's just a standard inductive proximity sensor in a 12 mm cylindrical housing, and it comes with two mounting nuts, so that's how it's mounted. We do offer a variety of brackets for use in mounting M12 cylindrical housings. There aren't any mounting kits specifically designed for valve actuators.

I think maybe he wants to look at our series of inductive proximity sensors in special housings that are designed to be mounted on standard actuators, because these have two sensing areas, each with a corresponding output. One is for the valve open position and the other is for the valve closed position. There are mounting kits available for these sensors which include target pucks for installation on the actuator shaft.

John: In this next application, the customer has an 8 mm inductive proximity sensor NMB1.5-8GM50-E2-C-FE-V1 with a V1 suffix in the model number, and would like to know if this is a pigtail version, as he needs to fully embed this sensor into a block. Tracy, is the customer able to use this sensor in the manner he desires?

Tracy: Not this model. The one that he has listed has a V1 at the end, and that means it has an M12 connector. Now M12 is going to be bigger than the M8 thread that is on that sensor housing. He'd be able to find this information on the data sheet. This sensor's data sheet has a diagram on it with dimensions and it shows the M8 threaded housing with a widened part that goes to an M12 connector.

What he wants is the one that does not end in V1, and it just ends in the C-FE. As he can see from that sensor's data sheet, it does have the pigtail cable with no connector at the end. He would also be able to see there is a part of that housing that is smaller than M8 and is not threaded, but he can still embed that in his block.

John: Well, that concludes this segment of Ask an Expert. I'd like to thank Tracy for joining me today, and thank our audience as well.

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Topics: Inductive Sensors, Ask an Expert

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